CN114405468A - Preparation method of sphagnum charcoal adsorbent - Google Patents

Preparation method of sphagnum charcoal adsorbent Download PDF

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CN114405468A
CN114405468A CN202210087646.2A CN202210087646A CN114405468A CN 114405468 A CN114405468 A CN 114405468A CN 202210087646 A CN202210087646 A CN 202210087646A CN 114405468 A CN114405468 A CN 114405468A
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sphagnum
powder
solution
tio
polysaccharide
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CN114405468B (en
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程梓杰
杨阳
陈珂
类延宝
孙庚�
唐运来
任鹏
任惠
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Chengdu Institute of Biology of CAS
Southwest University of Science and Technology
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Chengdu Institute of Biology of CAS
Southwest University of Science and Technology
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
    • C—CHEMISTRY; METALLURGY
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    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/46—Materials comprising a mixture of inorganic and organic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/48—Sorbents characterised by the starting material used for their preparation
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
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    • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/48—Sorbents characterised by the starting material used for their preparation
    • B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
    • B01J2220/4825—Polysaccharides or cellulose materials, e.g. starch, chitin, sawdust, wood, straw, cotton
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/48—Sorbents characterised by the starting material used for their preparation
    • B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
    • B01J2220/4843—Algae, aquatic plants or sea vegetals, e.g. seeweeds, eelgrass
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/006—Radioactive compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds

Abstract

The invention discloses a preparation method of a sphagnum charcoal adsorbent, which comprises the following steps: the preparation method of the sphagnum biological carbon comprises the following steps: cleaning with deionized water to remove dust and impurities of sphagnum, drying sphagnum at 105 deg.C for 6 hr, pulverizing, and filtering with 0.45mm screen; filling 5g of sphagnum into a 120ml ark, loading the ark into a tube furnace, and heating the ark at constant temperature under the condition of continuous nitrogen flow of 60cm3/min to prepare the sphagnum biochar adsorbent, wherein the constant temperature heating temperature is 400-1000 DEG CHeating for 60-120 min; fe modified with silane coupling agent3O4‑TiO2And spraying the mixed slurry on the surface of the sphagnum charcoal, washing with water, drying, and activating in a nitrogen atmosphere for 1-3 h to prepare the sphagnum charcoal adsorbent. The sphagnum charcoal adsorbent prepared by the invention has obvious surface pore structure and surface groups, has high mesoporous rate, greatly improves the adsorption capacity to strontium, and provides an important reference material for solving the problem of strontium pollution.

Description

Preparation method of sphagnum charcoal adsorbent
Technical Field
The invention belongs to the technical field of environmental pollution treatment and sewage purification, and particularly relates to a preparation method of a sphagnum charcoal adsorbent.
Background
In recent years, biomass materials with high cellulose and lignin are widely applied to preparing biochar and treating water source pollution. Strontium (Sr) is a novel environmental pollutant with certain representativeness, and the persistence, the biological effectiveness and the toxicity of the strontium (Sr) have great threats to human beings. The use of the charcoal adsorbent to solve the problem is one of the channels with low cost and remarkable effect. The increasing environmental pollution, such as severe water resource shortage in multiple regions around the world, is one of the reasons for the rapidly developing nuclear energy industry and the imperfect production management system. Sr is a relatively new industrial element and gradually enters the field of people along with the development of nuclear energy and alloy industries. The Sr harm to the organism is mainly due to the competitive relationship with Ca (Anna burger, irenerlichscheidl, 2019) to injure the organs, and the excessive accumulation of S r in the environment has significant toxicity to the plant, root growth inhibition and chlorosis (Takeshi nagata, 2019).
The adsorbent is one of the most effective methods for purifying water resources, and the biochar is an environment-friendly adsorbent (Arefalshemeri, et al, 2018) which can be used as a catalyst carrier and used for purifying wastewater and air, and comprises abundant pore structures including micropores, mesopores and macropores, wherein the micropores with the pore diameter of less than 2 nm are called as micropores; macropores with a pore diameter of more than 50 nm; the mesoporous material with the pore diameter of 2-50nm is called as mesoporous, and the surface of the mesoporous material is distributed with abundant functional groups, so that the mesoporous material has ideal adsorption and retention effects on different types of pollutants (Oliveira fernanda r, et al, 2017). Biochar is generally obtained by slow pyrolysis of biomass under inert gas atmosphere, with physicochemical changes following degradation of cellulose, dehydration degreasing, aromatisation (Subrattiafaz, et al, 2021). Compared with activated carbon, the biochar does not need a complex activation process, so that the raw materials of the activating agent are saved, the pollution to the environment in the preparation process is reduced, the cost is reduced, and the biochar is a material which is more in line with the sustainable development concept.
The moss is one of the most abundant species on the earth's surface, and the coverage area reaches 3%, because of the special structure of moss cells, the moss has extremely high water retention capacity and can bear the environment of long-term drought and even expand in extreme environments (Kenji yoshikawa, Pier pauloverduin, Jennifer w. harden, 2004; Pa damo, et al, 2003). Due to the good morphological physiology and environmental adaptability, the moss is widely applied to monitoring of trace metal pollution in the atmosphere. Compared with other biomasses, the moss has high-level sugar components, cellulose, lignin, carbohydrates and amino acids, which are all beneficial to forming a better carbon structure after pyrolysis, and the development and application of lignocellulose materials are beneficial to solving the problems of high cost, harsh application conditions, easiness in generating secondary environmental pollution and the like in the traditional sewage treatment method (J.g. laurad, 2011; Qu angvivetly, et al, 2019). Mud-pond moss is common in application research of moss biomass, and is evaluated well in sewage treatment and electrochemical research, but the research on other moss species is deficient. The moss is an inexhaustible resource, and the research and application of strengthening and popularizing moss species are imperative. And the traditional pyrolysis method is adopted to treat the sphagnum, so that the optimization of the final preparation process according to the actual result is facilitated.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a method for preparing a sphagnum biochar adsorbent, comprising:
the preparation method of the sphagnum biological carbon comprises the following steps: cleaning with deionized water to remove dust and impurities of sphagnum, drying sphagnum at 105 deg.C for 6 hr, pulverizing, and filtering with 0.45mm screen; the 120ml volume of the ark was filled with 5g of grimmia frondosa and charged into a tube furnace at 60cm3And heating at constant temperature under the condition of continuous nitrogen flow for 60-120 min to obtain the sphagnum biochar adsorbent, wherein the constant-temperature heating temperature is 400-1000 ℃.
Preferably, the method further comprises the following steps:
step one, preparing nano Fe coated by polysaccharide3O4Powder of and with TiO2The powder is used as doping agent and TiO is added2Powder incorporation of polysaccharide coated nano-Fe3O4Powder to obtain Fe3O4-TiO2Mixing the powder; wherein, TiO2Powder and nano Fe3O4The mass ratio of the powder is 1: 10-40, and the polysaccharide and the nano Fe are mixed3O4The mass ratio of the powder is 1: 50;
step two, adding Fe3O4-TiO2Adding the mixed powder into a silane coupling agent solution, and reacting to obtain silane coupling agent modified Fe3O4-TiO2Mixing the slurry;
step three, modifying the silane coupling agent modified Fe prepared in the step three3O4-TiO2Spraying the mixed slurry on the surface of the sphagnum biochar, washing with water, drying, and activating in nitrogen atmosphere for the activation timeAnd (5) 1-3 h, preparing the sphagnum charcoal adsorbent.
Preferably, wherein, the polysaccharide coated nano Fe of the first step3O4The preparation method of the powder comprises the following steps:
step S21, weighing 10-40 parts of nano Fe by weight3O4Powder of nanometer Fe with gelatin solution of 8 wt%3O4Wetting the powder to obtain gelatin-wetted nano Fe3O4Powder, gelatin solution and nano Fe3O4The mass ratio of the powder is 1: 23-27;
step S22, esterifying polysaccharide with tetraethyl titanate, the specific method is as follows: dissolving tetraethyl titanate in diethyl ether to obtain a tetraethyl titanate solution, dissolving polysaccharide in a glacial acetic acid solution, mixing the glacial acetic acid solution in which the polysaccharide is dissolved with the tetraethyl titanate solution, and stirring for reacting for 20-45 min to obtain an esterified polysaccharide solution;
step S23, evaporating and concentrating the esterified polysaccharide solution to reduce the water content to 20%, and coating the evaporated polysaccharide on gelatin-wetted nano Fe3O4Drying the powder surface to obtain the nano Fe coated with polysaccharide3O4And (3) powder.
Preferably, wherein, in the second step, Fe is mixed3O4-TiO2Adding the mixed powder into a silane coupling agent solution, performing ultrasonic dispersion for 1-2 h at the ultrasonic frequency of 40kHz, heating to 70-80 ℃, and then performing heat preservation for 30min to obtain silane coupling agent modified Fe3O4-TiO2The slurry is mixed.
Preferably, the polysaccharide is one of dextran, cellulose, chitosan or acacia.
Preferably, the silane coupling agent is one of methyltrimethoxysilane, diphenylmethylsilane, or methyldichlorosilane; in the silane coupling agent solution, the mass ratio of the silane coupling agent to the deionized water is 1: 103-115; fe3O4-TiO2The mass ratio of the mixed powder to the silane coupling agent solution is 2: 35-40.
Preferably, the mass fraction of the tetraethyl titanate solution is 30-36%, the mass ratio of the polysaccharide to the glacial acetic acid solution is 1: 110, and the mass fraction of the glacial acetic acid solution is 60-80%.
Preferably, wherein said Fe3O4-TiO2The mass ratio of the mixed slurry to the sphagnum charcoal is 1: 45-75.
Preferably, the method for activating under nitrogen atmosphere in the third step comprises the following steps: will be sprayed with Fe3O4-TiO2Putting the sphagnum charcoal mixed with the serous fluid into a vacuum closed container, wherein the vacuum degree is 1.27 multiplied by 10-7And introducing nitrogen into the vacuum closed container below Pa, heating the vacuum closed container to 300-500 ℃ for 20min, and keeping the temperature for 1-3 h.
Preferably, the determination method for strontium adsorption by the sphagnum charcoal adsorbent comprises the following steps: mixing SrCl2Dissolving in deionized water to prepare Sr stock solution with the concentration of 1000 mg/L; before use, the working solution is subjected to the use of 0.1mol/L HNO3Adjusting the pH value to be 2.0 +/-0.1, wherein the kinetic test scheme is that 0.1g of sphagnum biochar adsorbent is put into 250ml of 500mg/L working solution, and sampling is carried out for 5, 10, 20, 40, 60, 90, 120, 150, 180, 360, 720, 1440 and 2880 minutes to determine the concentration of the solution; in the isothermal test, 0.1g of biochar is put into 100ml of working solution and is adsorbed for 24 hours; all the adsorption was performed in a constant temperature shaker at 25 deg.C and 120rpm, using 0.45um microporous membrane and disposable syringe to obtain filtrate, and using 0.1mol/L HNO3Diluting the filtrate; measuring Sr in the diluted sample liquid by using an acetylene-flame method of an atomic absorption spectrometer, and measuring the biochar adsorption quantity Q at t timetCalculated from equation 2:
Figure RE-GDA0003538383500000041
in the formula, C0As initial working fluid concentration, CtThe concentration of the working fluid at time t, and v is adsorbedIn the process, the volume of the working solution and w are the adding amount of the sphagnum charcoal adsorbent.
The invention at least comprises the following beneficial effects: the sphagnum charcoal adsorbent prepared by the invention has obvious surface pore structure and surface groups, has high mesoporous rate, greatly improves the adsorption capacity to strontium, and provides an important reference material for solving the problem of strontium pollution.
The sphagnum charcoal adsorbent obtained by high-temperature pyrolysis can release volatile components remained, and pores on the surface of the material can be well developed at high temperature. The surface of the sphagnum charcoal adsorbent obtained by high-temperature pyrolysis has a dense mesopore (mesopore) structure, mesopores play an important role in adsorption reaction, smaller mesopores can be used as charge absorption binding sites, and ion transport channels are generally carried out through larger mesopores, namely, the distribution and the number of the mesopores play an important role in the adsorption reaction. The sphagnum powder is neutral, the biochar obtained after high-temperature carbonization is alkaline, and the reduction of hydroxyl oxygen-containing functional groups on the surface is possible after high-temperature carbonization, and the accumulation of alkali salts such as carbonate and nitrate on the surface is accompanied. The EC of biochar is significantly increased compared to biomass, while the conductivity of the suspension depends on the salt concentration in the liquid, the ash content of biomass is higher than biomass, while biochar with higher ash content has higher salt content, so higher conductivity results. The increase of the content of exchangeable cations is more beneficial to the adsorption and retention of the organic matters. The specific surface area of the biomass after high-temperature carbonization is remarkably increased, which is the result of chemical reaction caused by carbonization, and can be explained as that volatile components are removed in the carbonization process to form air holes on the surface of the material, the condensation degree of tar products is reduced, and core groups such as phenolic aldehyde-OH, aromatic CO-, fatty alkyl and the like in an aromatic structure are removed through high-temperature carbonization. The lower BET specific surface area, pore volume of the carbon precursor indicates that the starting material has more closed cells. Pyrolysis creates a higher specific surface area for biomass, which is very advantageous for adsorption to proceed. Meanwhile, the formation of the graphite carbon is intensified in the high-temperature carbonization process, the total content proportion of the graphite carbon in the functional carbon is improved, the graphite carbon has hydrophobicity, the hydrophobicity of the sphagnum charcoal adsorbent is improved due to the increase of the proportion of the carbonized graphite carbon, and the graphite structure can promote organic molecules to form pi-pi bonds in the adsorption process, so that the chemical adsorption process is facilitated. After carbonization, the relative content of quinine carbonyl oxygen atoms in the biomass is reduced, and the relative content of functional oxygen-containing functional groups on the surface is increased, so that the chemical adsorption capacity of the sphagnum biological carbon adsorbent in adsorption behavior is enhanced.
Polysaccharide coated nano Fe3O4The powder is prepared into slurry and is sandblasted on the surface of the sphagnum biochar, so that the adsorption capacity of the sphagnum outdoor biochar adsorbent is further improved; nano Fe3O4The powder surface also has dense mesopores, and the coating and polycondensation process of the polysaccharide can accurately regulate and control the nano Fe3O4The mesopore density of the powder is reduced, and the nano Fe content is reduced3O4The agglomeration of the powder and the esterification of the polysaccharide by the tetraethyl titanate reduce the number of hydroxyl groups on the surface of the polysaccharide, namely the polysaccharide is changed from hydrophilicity to hydrophilicity, and the adsorption capacity of the polysaccharide to strontium in the wastewater is improved. While the polysaccharide is used for nano Fe3O4Before coating the powder, the gelatin solution is used for coating the nano Fe3O4The powder is wetted to improve the nano Fe3O4The binding capacity of the powder and the polysaccharide ensures that the nano Fe is ensured in the subsequent activation drying process3O4The powder and polysaccharide do not separate. Silane coupling agent improves the bonding of TiO2Powder and nano Fe3O4Homogeneity of powder mixing while TiO2The powder also has extremely high mesoporous rate and extremely strong adsorption capacity, and is combined with the nano Fe3O4The adsorption capacity of the sphagnum charcoal adsorbent is improved after the powder is mixed.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a graph showing the comparison of strontium adsorption capacity of the sphagnum charcoal adsorbents obtained in examples 1 to 12;
FIG. 2 is a scanning electron microscope image of the surface of a sphagnum charcoal adsorbent prepared at a constant heating temperature of 400 ℃;
FIG. 3 is a scanning electron microscope image of the surface of a sphagnum charcoal adsorbent prepared at a constant heating temperature of 600 ℃;
FIG. 4 is a scanning electron microscope image of the surface of a sphagnum charcoal adsorbent prepared at a constant heating temperature of 800 ℃;
FIG. 5 is a scanning electron microscope image of the surface of a sphagnum charcoal adsorbent prepared at a constant heating temperature of 1000 ℃;
FIG. 6 is a scanning electron microscope image of the surface of a sphagnum charcoal adsorbent prepared at a constant heating temperature of 1000 ℃;
FIG. 7 is a quasi-first and quasi-second order kinetic curve fit of adsorption kinetics of sphagnum snake charcoal adsorbent to Sr;
FIG. 8 is a scanning electron microscope of the surface of the adsorbent of sphagnum charcoal before adsorption;
FIG. 9 is the scanning electron microscope of the adsorption surface of the sphagnum charcoal after adsorption.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1
The preparation method of the sphagnum biological carbon comprises the following steps: cleaning with deionized water to remove dust and impurities of sphagnum, drying sphagnum at 105 deg.C for 6 hr, pulverizing, and filtering with 0.45mm screen; the 120ml volume of the ark was filled with 5g of grimmia frondosa and charged into a tube furnace at 60cm3Heating at constant temperature under continuous nitrogen flow condition for min to obtain the sphagnum charcoal adsorbent, wherein the heating at constant temperature is carried outThe heating temperature is 400 deg.C, and the heating time is 60 min.
Example 2
The preparation method of the sphagnum biological carbon comprises the following steps: cleaning with deionized water to remove dust and impurities of sphagnum, drying sphagnum at 105 deg.C for 6 hr, pulverizing, and filtering with 0.45mm screen; the 120ml volume of the ark was filled with 5g of grimmia frondosa and charged into a tube furnace at 60cm3And heating at constant temperature under the condition of continuous nitrogen flow for 90min to obtain the sphagnum biochar adsorbent, wherein the constant temperature is 400 ℃.
Example 3
The preparation method of the sphagnum biological carbon comprises the following steps: cleaning with deionized water to remove dust and impurities of sphagnum, drying sphagnum at 105 deg.C for 6 hr, pulverizing, and filtering with 0.45mm screen; the 120ml volume of the ark was filled with 5g of grimmia frondosa and charged into a tube furnace at 60cm3And heating at constant temperature under the condition of continuous nitrogen flow for 120min to obtain the sphagnum biochar adsorbent, wherein the constant temperature is 400 ℃.
Example 4
The preparation method of the sphagnum biological carbon comprises the following steps: cleaning with deionized water to remove dust and impurities of sphagnum, drying sphagnum at 105 deg.C for 6 hr, pulverizing, and filtering with 0.45mm screen; the 120ml volume of the ark was filled with 5g of grimmia frondosa and charged into a tube furnace at 60cm3And heating at constant temperature under the condition of continuous nitrogen flow for 60min to obtain the sphagnum biochar adsorbent, wherein the constant temperature is 600 ℃.
Example 5
The preparation method of the sphagnum biological carbon comprises the following steps: cleaning with deionized water to remove dust and impurities of sphagnum, drying sphagnum at 105 deg.C for 6 hr, pulverizing, and filtering with 0.45mm screen; the 120ml volume of the ark was filled with 5g of grimmia frondosa and charged into a tube furnace at 60cm3And (3) heating at constant temperature under the condition of continuous nitrogen flow for 90min to prepare the sphagnum biochar adsorbent, wherein the constant heating temperature is 600 ℃, and the heating time is 90 min.
Example 6
The preparation method of the sphagnum biological carbon comprises the following steps: cleaning with deionized water to remove dust and impurities of sphagnum, drying sphagnum at 105 deg.C for 6 hr, pulverizing, and filtering with 0.45mm screen; the 120ml volume of the ark was filled with 5g of grimmia frondosa and charged into a tube furnace at 60cm3And heating at constant temperature under the condition of continuous nitrogen flow for 120min to obtain the sphagnum biochar adsorbent, wherein the constant temperature is 600 ℃.
Example 7
The preparation method of the sphagnum biological carbon comprises the following steps: cleaning with deionized water to remove dust and impurities of sphagnum, drying sphagnum at 105 deg.C for 6 hr, pulverizing, and filtering with 0.45mm screen; the 120ml volume of the ark was filled with 5g of grimmia frondosa and charged into a tube furnace at 60cm3And (3) heating at constant temperature under the condition of continuous nitrogen flow for 60min to obtain the sphagnum biochar adsorbent, wherein the constant heating temperature is 800 ℃.
Example 8
The preparation method of the sphagnum biological carbon comprises the following steps: cleaning with deionized water to remove dust and impurities of sphagnum, drying sphagnum at 105 deg.C for 6 hr, pulverizing, and filtering with 0.45mm screen; the 120ml volume of the ark was filled with 5g of grimmia frondosa and charged into a tube furnace at 60cm3And (3) heating at constant temperature under the condition of continuous nitrogen flow for 90min to prepare the sphagnum biochar adsorbent, wherein the constant heating temperature is 800 ℃ and the heating time is 90 min.
Example 9
The preparation method of the sphagnum biological carbon comprises the following steps: cleaning with deionized water to remove dust and impurities of sphagnum, drying sphagnum at 105 deg.C for 6 hr, pulverizing, and filtering with 0.45mm screen; the 120ml volume of the ark was filled with 5g of grimmia frondosa and charged into a tube furnace at 60cm3And (3) heating at constant temperature under the condition of continuous nitrogen flow for 120min to prepare the sphagnum biochar adsorbent, wherein the constant heating temperature is 800 ℃.
Example 10
The preparation method of the sphagnum biological carbon comprises the following steps: use upWashing with ionized water to remove dust and impurities of sphagnum, oven drying sphagnum at 105 deg.C for 6 hr, pulverizing, and filtering with 0.45mm screen; the 120ml volume of the ark was filled with 5g of grimmia frondosa and charged into a tube furnace at 60cm3And heating at constant temperature under the condition of continuous nitrogen flow for 60min to obtain the sphagnum biochar adsorbent, wherein the constant temperature is 1000 ℃.
Example 11
The preparation method of the sphagnum biological carbon comprises the following steps: cleaning with deionized water to remove dust and impurities of sphagnum, drying sphagnum at 105 deg.C for 6 hr, pulverizing, and filtering with 0.45mm screen; the 120ml volume of the ark was filled with 5g of grimmia frondosa and charged into a tube furnace at 60cm3And heating at constant temperature under the condition of continuous nitrogen flow for 90min to obtain the sphagnum biochar adsorbent, wherein the constant temperature is 1000 ℃.
Example 12
The preparation method of the sphagnum biological carbon comprises the following steps: cleaning with deionized water to remove dust and impurities of sphagnum, drying sphagnum at 105 deg.C for 6 hr, pulverizing, and filtering with 0.45mm screen; the 120ml volume of the ark was filled with 5g of grimmia frondosa and charged into a tube furnace at 60cm3And heating at constant temperature under the condition of continuous nitrogen flow for 120min to obtain the sphagnum biochar adsorbent, wherein the constant temperature is 1000 ℃.
Example 13
The preparation method of the sphagnum biological carbon comprises the following steps: cleaning with deionized water to remove dust and impurities of sphagnum, drying sphagnum at 105 deg.C for 6 hr, pulverizing, and filtering with 0.45mm screen; the 120ml volume of the ark was filled with 5g of grimmia frondosa and charged into a tube furnace at 60cm3And heating at constant temperature under the condition of continuous nitrogen flow for 90min to obtain the sphagnum biochar, wherein the constant temperature is 1000 ℃.
Preparation of cellulose-coated Nano Fe3O4The powder specifically comprises the following steps:
step S21, weighing 10g of nano Fe according to parts by weight3O4Powder of nanometer Fe with gelatin solution of 8 wt%3O4Wetting the powder to obtain gelatin-wetted nano Fe3O4Powder, the dosage of the gelatin solution is 0.4 g;
step S22, esterifying the cellulose by using tetraethyl titanate, wherein the method comprises the following steps: dissolving tetraethyl titanate in diethyl ether to obtain a tetraethyl titanate solution, dissolving cellulose in a glacial acetic acid solution, mixing the glacial acetic acid solution in which the cellulose is dissolved with the tetraethyl titanate solution, and stirring for reacting for 20min to obtain an esterified cellulose solution; wherein the mass fraction of the tetraethyl titanate solution is 30%, the mass ratio of the cellulose to the glacial acetic acid solution is 1: 110, and the mass fraction of the glacial acetic acid solution is 60%;
step S23, evaporating and concentrating the esterified cellulose solution to reduce the water content to 20%, and coating the evaporated cellulose with gelatin-wetted nano Fe3O4Drying the powder surface to obtain the nano Fe coated by the cellulose3O4Powder; wherein the dosage of the cellulose is 0.2 g;
with TiO2The powder is used as doping agent and TiO is added2Powder incorporating cellulose coated nano-Fe3O4Powder to obtain Fe3O4-TiO2Mixing the powder; wherein, TiO2The dosage of the powder is 1 g;
mixing Fe3O4-TiO2Adding the mixed powder into a methyltrimethoxysilane solution, performing ultrasonic dispersion for 1h at the ultrasonic frequency of 40kHz, heating to 70 ℃, then preserving heat for 30min, and reacting to obtain methyltrimethoxysilane modified Fe3O4-TiO2Mixing the slurry; wherein the mass ratio of the methyltrimethoxysilane to the deionized water is 1: 103; fe3O4-TiO2The mass ratio of the mixed powder to the methyltrimethoxysilane solution is 2: 35;
1g of the prepared methyltrimethoxysilane-modified Fe was weighed3O4-TiO2Spraying the mixed slurry on the surface of the sphagnum charcoal, washing with water, drying, and activating in nitrogen atmosphere for 1hThe concrete method comprises the following steps:
will be sprayed with Fe3O4-TiO2Putting the sphagnum charcoal mixed with the serous fluid into a vacuum closed container, wherein the vacuum degree is 1.27 multiplied by 10-7And introducing nitrogen into the vacuum closed container below Pa, heating the vacuum closed container to 300-500 ℃ for 20min, and keeping the temperature for 1 h.
Thus, the sphagnum biological carbon adsorbent is prepared.
Example 14
The preparation method of the sphagnum biological carbon comprises the following steps: cleaning with deionized water to remove dust and impurities of sphagnum, drying sphagnum at 105 deg.C for 6 hr, pulverizing, and filtering with 0.45mm screen; the 120ml volume of the ark was filled with 5g of grimmia frondosa and charged into a tube furnace at 60cm3And heating at constant temperature under the condition of continuous nitrogen flow for 90min to obtain the sphagnum biochar, wherein the constant temperature is 1000 ℃.
Preparation of cellulose-coated Nano Fe3O4The powder specifically comprises the following steps:
step S21, weighing 20g of nano Fe according to parts by weight3O4Powder of nanometer Fe with gelatin solution of 8 wt%3O4Wetting the powder to obtain gelatin-wetted nano Fe3O4Powder, the dosage of the gelatin solution is 0.8 g;
step S22, esterifying the cellulose by using tetraethyl titanate, wherein the method comprises the following steps: dissolving tetraethyl titanate in diethyl ether to obtain a tetraethyl titanate solution, dissolving cellulose in a glacial acetic acid solution, mixing the glacial acetic acid solution in which the cellulose is dissolved with the tetraethyl titanate solution, and stirring for reaction for 30min to obtain an esterified cellulose solution; wherein, the mass fraction of the tetraethyl titanate solution is 33 percent, the mass ratio of the cellulose to the glacial acetic acid solution is 1: 110, and the mass fraction of the glacial acetic acid solution is 65 percent;
step S23, evaporating and concentrating the esterified cellulose solution to reduce the water content to 20%, and coating the evaporated cellulose with gelatin-wetted nano Fe3O4Powder meterThe nano Fe coated by the cellulose is obtained after the dough is baked3O4Powder; wherein the dosage of the cellulose is 0.4 g;
with TiO2The powder is used as doping agent and TiO is added2Powder incorporating cellulose coated nano-Fe3O4Powder to obtain Fe3O4-TiO2Mixing the powder; wherein, TiO2The dosage of the powder is 1 g;
mixing Fe3O4-TiO2Adding the mixed powder into methyltrimethoxysilane solution, performing ultrasonic dispersion for 1.5h at an ultrasonic frequency of 40kHz, heating to 75 ℃, keeping the temperature for 30min, and reacting to obtain methyltrimethoxysilane modified Fe3O4-TiO2Mixing the slurry; wherein the mass ratio of the methyltrimethoxysilane to the deionized water is 1: 110; fe3O4-TiO2The mass ratio of the mixed powder to the methyltrimethoxysilane solution is 2: 38;
1g of methyltrimethoxysilane-modified Fe was weighed3O4-TiO2The mixed slurry is sprayed on the surface of sphagnum biochar, washed by water, dried and activated in nitrogen atmosphere for 2h, and the specific method for activating comprises the following steps:
will be sprayed with Fe3O4-TiO2Putting the sphagnum charcoal mixed with the serous fluid into a vacuum closed container, wherein the vacuum degree is 1.27 multiplied by 10-7And introducing nitrogen into the vacuum closed container below Pa, heating the vacuum closed container to 300-500 ℃ for 20min, and keeping the temperature for 1 h.
Thus, the sphagnum biological carbon adsorbent is prepared.
Example 15
The preparation method of the sphagnum biological carbon comprises the following steps: cleaning with deionized water to remove dust and impurities of sphagnum, drying sphagnum at 105 deg.C for 6 hr, pulverizing, and filtering with 0.45mm screen; the 120ml volume of the ark was filled with 5g of grimmia frondosa and charged into a tube furnace at 60cm3And heating at constant temperature under the condition of continuous nitrogen flow for 90min to obtain the sphagnum biochar, wherein the constant temperature is 1000 ℃.
Preparation of cellulose-coated Nano Fe3O4The powder specifically comprises the following steps:
step S21, weighing 40g of nano Fe according to parts by weight3O4Powder of nanometer Fe with gelatin solution of 8 wt%3O4Wetting the powder to obtain gelatin-wetted nano Fe3O4Powder, the dosage of the gelatin solution is 1.6 g;
step S22, esterifying the cellulose by using tetraethyl titanate, wherein the method comprises the following steps: dissolving tetraethyl titanate in diethyl ether to obtain a tetraethyl titanate solution, dissolving cellulose in a glacial acetic acid solution, mixing the glacial acetic acid solution in which the cellulose is dissolved with the tetraethyl titanate solution, and stirring for reacting for 45min to obtain an esterified cellulose solution; wherein the mass fraction of the tetraethyl titanate solution is 36%, the mass ratio of the cellulose to the glacial acetic acid solution is 1: 110, and the mass fraction of the glacial acetic acid solution is 80%;
step S23, evaporating and concentrating the esterified cellulose solution to reduce the water content to 20%, and coating the evaporated cellulose with gelatin-wetted nano Fe3O4Drying the powder surface to obtain the nano Fe coated by the cellulose3O4Powder; wherein the dosage of the cellulose is 0.8 g;
with TiO2The powder is used as doping agent and TiO is added2Powder incorporating cellulose coated nano-Fe3O4Powder to obtain Fe3O4-TiO2Mixing the powder; wherein, TiO2The dosage of the powder is 1 g;
mixing Fe3O4-TiO2Adding the mixed powder into a methyltrimethoxysilane solution, carrying out ultrasonic dispersion for 2h at the ultrasonic frequency of 40kHz, heating to 80 ℃, then carrying out heat preservation for 30min, and reacting to obtain methyltrimethoxysilane modified Fe3O4-TiO2Mixing the slurry; wherein the mass ratio of the methyltrimethoxysilane to the deionized water is 1: 115; fe3O4-TiO2The mass ratio of the mixed powder to the methyltrimethoxysilane solution is 2: 40;
1g of the prepared methyltrimethoxysilane-modified Fe was weighed3O4-TiO2The mixed slurry is sprayed on the surface of sphagnum biochar, washed by water, dried and activated in nitrogen atmosphere for 3h, and the specific activation method comprises the following steps: will be sprayed with Fe3O4-TiO2Putting the sphagnum charcoal mixed with the serous fluid into a vacuum closed container, wherein the vacuum degree is 1.27 multiplied by 10-7And introducing nitrogen into the vacuum closed container below Pa, heating the vacuum closed container to 300-500 ℃ for 20min, and keeping the temperature for 3 h.
Thus, the sphagnum biological carbon adsorbent is prepared.
The adsorption capacity of the sphagnum charcoal adsorbents prepared in examples 1 to 15 to strontium was measured by the following methods: mixing SrCl2Dissolving in deionized water to prepare Sr stock solution with the concentration of 1000 mg/L; before use, the working solution is subjected to the use of 0.1mol/L HNO3Adjusting the pH value to be 2.0 +/-0.1, wherein the kinetic test scheme is that 0.1g of sphagnum biochar adsorbent is put into 250ml of 500mg/L working solution, and sampling is carried out for 5, 10, 20, 40, 60, 90, 120, 150, 180, 360, 720, 1440 and 2880 minutes to determine the concentration of the solution; in the isothermal test, 0.1g of biochar is put into 100ml of working solution and is adsorbed for 24 hours; all the adsorption was performed in a constant temperature shaker at 25 deg.C and 120rpm, using 0.45um microporous membrane and disposable syringe to obtain filtrate, and using 0.1mol/L HNO3Diluting the filtrate; measuring Sr in the diluted sample liquid by using an acetylene-flame method of an atomic absorption spectrometer, and measuring the biochar adsorption quantity Q at t timetCalculated from equation 2:
Figure RE-GDA0003538383500000131
in the formula, C0As initial working fluid concentration, CtThe concentration of the working solution at the moment t, v is the volume of the working solution in the adsorption process, and w is the dosage of the sphagnum biochar adsorbent.
Fig. 1 is a graph comparing the strontium adsorption capacity of the sphagnum charcoal adsorbents prepared in examples 1 to 12, and fig. 3 shows that the sphagnum charcoal adsorbent engine oil prepared by heating at 1000 ℃ and maintaining the temperature for 90min has extremely high adsorption performance. Fig. 2 to 4 show scanning electron microscope images of the surfaces of the sphagnum charcoal adsorbents prepared by heating at constant temperatures of 400 ℃, 600 ℃ and 800 ℃, respectively, and fig. 5 and 6 show electron microscope images of the surfaces of the sphagnum charcoal adsorbents prepared by heating at constant temperatures of 1000 ℃. As can be seen from fig. 5 and 6, the sphagnum biochar adsorbent prepared at a high temperature of 1000 ℃ has a dense mesoporous structure on the surface, and therefore has more excellent adsorption capacity. Fig. 7 is a quasi-first and quasi-second order kinetic curve fit of adsorption kinetics of sphagnum charcoal adsorbent to Sr, the adsorption reaches a substantial stability for 12h, and the adsorption of sphagnum carbon to Sr has a higher efficiency before 240 min. The adsorption model of the sphagnum carbon to the strontium solution is closer to a quasi-second-order kinetic model, as shown in table 1, R2 is greater than 0.93, which indicates that the material has more saturated sites, expresses the composite effect of a multiple adsorption mechanism, and the adsorption type is more biased to chemical adsorption rather than physical adsorption. Before the adsorption of Sr, the surface of the sphagnum biochar is smooth, and the pore distribution of the surface structure is obvious, as shown in figure 8. After the strontium solution is adsorbed, the surface structure of the material is obviously filled, and the surface of the material presents a phenomenon of film coverage, as shown in fig. 9, the smaller pores on the surface of the adsorbed material are filled, and the surface of the Sr-adsorbed biochar material is compact and smooth.
TABLE 1 first and second order kinetic parameters for Sr adsorption on Sandy moss biochar adsorbents
Figure RE-GDA0003538383500000132
Figure RE-GDA0003538383500000141
The significance of the test data is analyzed and counted by using One-factor variance (One-ANOVA) in software SPSS (26.0), the infrared data is analyzed by using OMNIC software, and all the data are mean values and standard deviations obtained by repeating three times of tests. The graph was plotted using excel (2019) and origin (2019 b).
The kinetic data were fitted using a Lagergren pseudo-first order kinetic model and a pseudo-second order kinetic model,
Figure RE-GDA0003538383500000142
Figure RE-GDA0003538383500000143
wherein q iseIs the adsorption capacity (mg/g) on the charcoal adsorbent at adsorption equilibrium, qtIs the adsorption capacity (mg/g), k, on the charcoal adsorbent at time t1And k2Are the rate constants of the first and second order kinetics, respectively.
The isothermal adsorption model was fitted using two models, Langmuir and Freundlich,
Figure RE-GDA0003538383500000144
Figure RE-GDA0003538383500000145
wherein, CeIs the concentration of Sr in the solution at equilibrium, and in the Langmuir isothermal model, the affinity correlation coefficient of the solute and the adsorbent is KL, qmaxMaximum adsorption (mg/g); KF is the predicted adsorption capacity based on the Freundlich isothermal model and adsorption strength measurements.
The strontium adsorption capacity of the sphagnum charcoal adsorbents obtained in example 11, example 13, example 14 and example 15 was compared with that of the existing materials, and the comparison results are shown in table 2:
TABLE 2 comparison of maximum adsorption capacity of strontium for Moss biochar adsorbent prepared according to the present invention and existing material
Figure RE-GDA0003538383500000146
Figure RE-GDA0003538383500000151
The result shows that the maximum adsorption quantity of the sphagnum charcoal adsorbent prepared by the method reaches more than 225mg/g of Sr at room temperature (25 ℃), and Fe coated by polysaccharide3O4-TiO2The adsorption capacity of the sphagnum charcoal adsorbent sprayed with the mixed slurry on strontium can even reach 247.1mg/g, which is obviously superior to that of the existing adsorption material.
The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (10)

1. A preparation method of a sphagnum charcoal adsorbent is characterized by comprising the following steps: the preparation method of the sphagnum biological carbon comprises the following steps: cleaning with deionized water to remove dust and impurities of sphagnum, drying sphagnum at 105 deg.C for 6 hr, pulverizing, and filtering with 0.45mm screen; the 120ml volume of the ark was filled with 5g of grimmia frondosa and charged into a tube furnace at 60cm3And heating at constant temperature under the condition of continuous nitrogen flow for 60-120 min to obtain the sphagnum biochar adsorbent, wherein the constant-temperature heating temperature is 400-1000 ℃.
2. The method for preparing a sphagnum charcoal adsorbent according to claim 1, further comprising the steps of:
step one, preparing nano Fe coated by polysaccharide3O4Powder of and with TiO2The powder is used as doping agent and TiO is added2Powder incorporation of polysaccharide coated nano-Fe3O4Powder to obtain Fe3O4-TiO2Mixing the powder; wherein, TiO2Powder and nano Fe3O4The mass ratio of the powder is 1: 10-40, and the polysaccharide and the nano Fe are mixed3O4The mass ratio of the powder is 1: 50;
step two, adding Fe3O4-TiO2Adding the mixed powder into a silane coupling agent solution, and reacting to obtain silane coupling agent modified Fe3O4-TiO2Mixing the slurry;
step three, modifying the silane coupling agent modified Fe prepared in the step three3O4-TiO2And spraying the mixed slurry on the surface of the sphagnum charcoal, washing with water, drying, and activating in a nitrogen atmosphere for 1-3 h to prepare the sphagnum charcoal adsorbent.
3. The method of claim 2, wherein the polysaccharide coated nano-Fe is used in the first step3O4The preparation method of the powder comprises the following steps:
step S21, weighing 10-40 parts of nano Fe by weight3O4Powder of nanometer Fe with gelatin solution of 8 wt%3O4Wetting the powder to obtain gelatin-wetted nano Fe3O4Powder, gelatin solution and nano Fe3O4The mass ratio of the powder is 1: 23-27;
step S22, esterifying polysaccharide with tetraethyl titanate, the specific method is as follows: dissolving tetraethyl titanate in diethyl ether to obtain a tetraethyl titanate solution, dissolving polysaccharide in a glacial acetic acid solution, mixing the glacial acetic acid solution in which the polysaccharide is dissolved with the tetraethyl titanate solution, and stirring for reacting for 20-45 min to obtain an esterified polysaccharide solution;
step S23, evaporating and concentrating the esterified polysaccharide solution to reduce the water content to 20%, and coating the evaporated polysaccharide on gelatin-wetted nano Fe3O4Drying the powder surface to obtain the nano Fe coated with polysaccharide3O4And (3) powder.
4. The process for preparing a sphagnum charcoal adsorbent according to claim 2, wherein in step two, Fe is added3O4-TiO2Adding the mixed powder into a silane coupling agent solution, performing ultrasonic dispersion for 1-2 h at the ultrasonic frequency of 40kHz, heating to 70-80 ℃, and then performing heat preservation for 30min to obtain silane coupling agent modified Fe3O4-TiO2The slurry is mixed.
5. The method of claim 2, wherein the polysaccharide is one of dextran, cellulose, chitosan or gum arabic.
6. The preparation method of the sphagnum biochar adsorbent according to claim 2, wherein the silane coupling agent is one of methyltrimethoxysilane, diphenylmethylsilane, or methyldichlorosilane; in the silane coupling agent solution, the mass ratio of the silane coupling agent to the deionized water is 1: 103-115; fe3O4-TiO2The mass ratio of the mixed powder to the silane coupling agent solution is 2: 35-40.
7. The preparation method of the sphagnum biochar adsorbent according to claim 3, wherein the mass fraction of the tetraethyl titanate solution is 30-36%, the mass ratio of the polysaccharide to the glacial acetic acid solution is 1: 110, and the mass fraction of the glacial acetic acid solution is 60-80%.
8. The method of claim 3, wherein the Fe is in the form of Fe3O4-TiO2The mass ratio of the mixed slurry to the sphagnum charcoal is 1: 45-75.
9. The preparation method of the sphagnum biochar adsorbent according to claim 2, wherein the third step of activating under the nitrogen atmosphere comprises the following steps: will be sprayed with Fe3O4-TiO2Putting the sphagnum charcoal mixed with the serous fluid into a vacuum closed container, wherein the vacuum degree is 1.27 multiplied by 10-7And introducing nitrogen into the vacuum closed container below Pa, heating the vacuum closed container to 300-500 ℃ for 20min, and keeping the temperature for 1-3 h.
10. The preparation method of the sphagnum charcoal adsorbent according to claim 1, wherein the determination method of strontium adsorption of the sphagnum charcoal adsorbent comprises the following steps: mixing SrCl2Dissolving in deionized water to prepare Sr stock solution with the concentration of 1000 mg/L; before use, the working solution is subjected to the use of 0.1mol/L HNO3Adjusting the pH value to be 2.0 +/-0.1, wherein the kinetic test scheme is that 0.1g of sphagnum biochar adsorbent is put into 250ml of 500mg/L working solution, and sampling is carried out for 5, 10, 20, 40, 60, 90, 120, 150, 180, 360, 720, 1440 and 2880 minutes to determine the concentration of the solution; in the isothermal test, 0.1g of biochar is put into 100ml of working solution and is adsorbed for 24 hours; all the adsorption was performed in a constant temperature shaker at 25 deg.C and 120rpm, using 0.45um microporous membrane and disposable syringe to obtain filtrate, and using 0.1mol/L HNO3Diluting the filtrate; measuring Sr in the diluted sample liquid by using an acetylene-flame method of an atomic absorption spectrometer, and measuring the biochar adsorption quantity Q at t timetCalculated from equation 2:
Figure FDA0003488488460000031
in the formula, C0As initial working fluid concentration, CtThe concentration of the working fluid at the moment t, v is the volume of the working fluid in the adsorption process, and w is the content of the sphagnum charcoal adsorbentAnd (4) putting amount.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115888661A (en) * 2022-11-10 2023-04-04 西南科技大学 Sponge and iron oxide water-based paint compound and preparation and application method thereof

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101780952A (en) * 2010-03-26 2010-07-21 上海交通大学 Method for preparing loading functional oxide porous carbon
CA2676333A1 (en) * 2009-08-21 2011-02-21 Chunbao Xu Peat derived carbon-based metal catalysts
CN103920473A (en) * 2014-04-28 2014-07-16 扬州大学 Method for preparing carbon-modified titanium dioxide composite magnetic nano adsorbent
CN109046356A (en) * 2018-07-02 2018-12-21 安徽宇瑞环保建设有限公司 A kind of rhdamine B waste water magnetic microsphere inorganic agent and preparation method thereof
CN109529767A (en) * 2018-12-10 2019-03-29 中冶华天工程技术有限公司 The preparation method and application method of the compound magnetic modification biological Carbon Materials of chitosan
CN109772328A (en) * 2019-01-29 2019-05-21 蚌埠学院 Titanium dioxide/ferroso-ferric oxide/active carbon nanometer waste water treating agent methods for making and using same
CN111672469A (en) * 2020-06-17 2020-09-18 西南科技大学 Fe-Ti bimetallic nanoparticle-loaded honey carbon material and preparation method and application thereof
US20210086163A1 (en) * 2019-09-19 2021-03-25 Tianjin University Method for preparing biochar from phosphoric acid-modified enteromorpha prolifera, and use of biochar in removal of cadmium
CN113083850A (en) * 2021-03-26 2021-07-09 维塔探索(广东)科技有限公司 Composite biochar for preventing and treating heavy metal pollution and preparation method thereof

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2676333A1 (en) * 2009-08-21 2011-02-21 Chunbao Xu Peat derived carbon-based metal catalysts
CN101780952A (en) * 2010-03-26 2010-07-21 上海交通大学 Method for preparing loading functional oxide porous carbon
CN103920473A (en) * 2014-04-28 2014-07-16 扬州大学 Method for preparing carbon-modified titanium dioxide composite magnetic nano adsorbent
CN109046356A (en) * 2018-07-02 2018-12-21 安徽宇瑞环保建设有限公司 A kind of rhdamine B waste water magnetic microsphere inorganic agent and preparation method thereof
CN109529767A (en) * 2018-12-10 2019-03-29 中冶华天工程技术有限公司 The preparation method and application method of the compound magnetic modification biological Carbon Materials of chitosan
CN109772328A (en) * 2019-01-29 2019-05-21 蚌埠学院 Titanium dioxide/ferroso-ferric oxide/active carbon nanometer waste water treating agent methods for making and using same
US20210086163A1 (en) * 2019-09-19 2021-03-25 Tianjin University Method for preparing biochar from phosphoric acid-modified enteromorpha prolifera, and use of biochar in removal of cadmium
CN111672469A (en) * 2020-06-17 2020-09-18 西南科技大学 Fe-Ti bimetallic nanoparticle-loaded honey carbon material and preparation method and application thereof
CN113083850A (en) * 2021-03-26 2021-07-09 维塔探索(广东)科技有限公司 Composite biochar for preventing and treating heavy metal pollution and preparation method thereof

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
MIAN MM. ET AL.: ""One-step synthesis of N-doped metal/biochae composite using NH3-ambiance pyrolysis for efficient degradation and mineralization of methylene blue"" *
代文静;胡健;吴攀;刘涛泽;卢然;: "生物炭纳米复合材料去除环境中有机污染物研究进展" *
徐雪斌;丁竹红;胡忻;陈逸;: "花生壳基和木屑基生物炭对离子型染料和Pb(Ⅱ)的吸附性能研究" *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115888661A (en) * 2022-11-10 2023-04-04 西南科技大学 Sponge and iron oxide water-based paint compound and preparation and application method thereof
CN115888661B (en) * 2022-11-10 2024-04-05 西南科技大学 Sponge and iron oxide water-based paint compound and preparation and application methods thereof

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