CN114405468B - Preparation method of sphagnum biochar adsorbent - Google Patents

Preparation method of sphagnum biochar adsorbent Download PDF

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CN114405468B
CN114405468B CN202210087646.2A CN202210087646A CN114405468B CN 114405468 B CN114405468 B CN 114405468B CN 202210087646 A CN202210087646 A CN 202210087646A CN 114405468 B CN114405468 B CN 114405468B
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sphagnum
powder
solution
tio
charcoal
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CN114405468A (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
    • 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
    • B01J20/06—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
    • C01—INORGANIC CHEMISTRY
    • 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
    • B01J2220/4806—Sorbents characterised by the starting material used for their preparation the starting material being of inorganic character
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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
    • 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
    • B01J2220/4825—Polysaccharides or cellulose materials, e.g. starch, chitin, sawdust, wood, straw, cotton
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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
    • 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 biochar comprises the following steps of: washing with deionized water to remove dust and impurities of the sphagnum, drying the sphagnum at 105 ℃ for 6 hours, crushing and filtering with a 0.45mm screen; filling 5g of sphagnum into a square boat with a capacity of 120ml, loading the sphagnum into a tube furnace, and heating at a constant temperature under the continuous nitrogen flow condition of 60cm < 3 >/min to prepare the sphagnum charcoal adsorbent, wherein the constant temperature heating temperature is 400-1000 ℃ and the heating time is 60-120 min; fe modified by silane coupling agent 3 O 4 ‑TiO 2 Spraying the mixed slurry on the surface of the sphagnum charcoal, washing with water, drying, and activating in nitrogen atmosphere for 1-3 h to obtain the sphagnum charcoal adsorbent. The prepared sphagnum charcoal adsorbent 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 biochar 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 biological carbon adsorbent.
Background
In recent years, biomass materials with high cellulose and lignin are widely applied to the preparation of biochar and the treatment of water source pollution. Strontium (Sr) is a representative new environmental pollutant, and its durability, bioavailability, and toxicity pose a great threat to humans. The use of biochar adsorbent to solve this problem is one of the channels of low cost and remarkable effect. Increasingly severe environmental pollution, such as the shortage of water resources, is faced by many regions of the world, and one of the reasons for the rapidly developing nuclear industry and imperfect production management regimes. Sr is a newer industrial element, and as the nuclear and alloy industries develop, it is also coming into the spotlight, especially after the nuclear power station leakage event (1985, uk) and the island nuclear leakage event (2011, japan) of the chernobileli, which are of particular interest (georgstenhauser, alexanderdl, thomas e.johnson, 2014). The harm of Sr to organisms is mainly manifested in the formation of a bid relation with Ca (Anna burger, irenichscheidedl, 2019) to damage organs, excessive accumulation of Sr in the environment is significantly toxic to plants, inhibits root growth, and has a chlorosis effect (Takeshi nagata, 2019).
The adsorbent is one of the most effective methods for purifying water resources currently acknowledged, and biochar is an environment-friendly adsorbent (artefasstrameri, et al, 2018) for purifying waste water, air and serving as a catalyst carrier, and contains abundant pore structures including micropores, mesopores and macropores, wherein the pore diameter is less than 2nm and is called micropores; the pore diameter is larger than 50nm and is called macropores; the pore diameter is 2-50nm and is called mesoporous, and the surface is distributed with rich functional groups, thus, there is an ideal adsorption and retention for different types of contaminants (Oliveira fernanda r, et al, 2017). Biochar is usually obtained by slow pyrolysis of biomass under inert gas atmosphere, with physical and chemical changes following degradation, dehydration degreasing, aromatization of cellulose (substatiafraz, et al 2021). Compared with active carbon, the biochar does not need a complex activation process, so that the raw materials of the activating agent are saved, the pollution and the expensive cost to the environment in the preparation process are reduced, and the material is more in line with the sustainable development concept.
Moss is one of the most abundant species on the surface, and the coverage area reaches 3%, because of the special structure of moss cells, moss has extremely high water holding capacity, can withstand long-term drought environments and even propagate under extreme environments (Kenji yoshikawa, pier pauloverduin, jennifer w.harden,2004;P adamo,et al,2003). Moss is widely used in atmospheric trace metal contamination monitoring due to its better morphological physiology and environmental suitability (Jelena d. Stankovi, anetad. Sabovljevi, marko s. Sabovljevi, 2018). Compared with other biomasses, moss has high levels of sugar components, cellulose, lignin, carbohydrate and amino acid, which are helpful to form a better carbon structure after pyrolysis, and the development and application of lignocellulose materials are beneficial to solving the problems of high cost, severe application conditions, easy secondary environmental pollution and the like in the traditional sewage treatment method (J.g. llaurado,2011;Quangvietly,et al,2019). The application research of moss biomass is more common in puddle moss, which is well evaluated in sewage treatment and electrochemical research, but the research on other moss species is deficient. The moss is a scarce resource, and the research and application of the moss species are imperative to be enhanced and promoted. And the traditional pyrolysis method is adopted to treat the sphagnum, so that the process for final preparation can be optimized according to actual results.
Disclosure of Invention
It is an object of the present invention to address at least the above problems and/or disadvantages and to provide at least the advantages described below.
To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided a method for preparing a sphagnum charcoal adsorbent, comprising:
the preparation method of the sphagnum biochar comprises the following steps of: washing with deionized waterRemoving dust and impurities of the sphagnum, drying the sphagnum at 105 ℃ for 6 hours, crushing and filtering by using a 0.45mm screen; 5g of sphagnum was charged into a 120ml capacity ark, and the mixture was charged into a tube furnace at 60cm 3 Heating at constant temperature under the continuous nitrogen flow condition of/min, wherein the constant temperature heating temperature is 400-1000 ℃ and the heating time is 60-120 min.
Preferably, the method further comprises the following steps:
step one, preparing polysaccharide coated nano Fe 3 O 4 Powder and TiO 2 Powder as dopant, tiO 2 Powder incorporation of polysaccharide coated nano Fe 3 O 4 Powder to obtain Fe 3 O 4 -TiO 2 Mixing the powder; wherein, tiO 2 Powder and nano Fe 3 O 4 The mass ratio of the powder is 1:10-40, and the polysaccharide and the nanometer Fe 3 O 4 The mass ratio of the powder is 1:50;
step two, fe 3 O 4 -TiO 2 Adding the mixed powder into a silane coupling agent solution, and reacting to obtain silane coupling agent modified Fe 3 O 4 -TiO 2 Mixing the slurry;
step three, modifying Fe with the silane coupling agent prepared in the step three 3 O 4 -TiO 2 Spraying the mixed slurry on the surface of the sphagnum charcoal, washing with water, drying, and activating in nitrogen atmosphere for 1-3 h to obtain the sphagnum charcoal adsorbent.
Preferably, wherein the polysaccharide coated nano Fe of the step one 3 O 4 The preparation method of the powder comprises the following steps:
step S21, weighing 10-40 parts of nano Fe according to parts by weight 3 O 4 Powder, using gelatin solution with mass fraction of 8% to perform nanometer Fe 3 O 4 Wetting the powder to obtain gelatin wetted nano Fe 3 O 4 Powder, gelatin solution and nano Fe 3 O 4 The mass ratio of the powder is 1:23-27;
step S22, esterifying polysaccharide by using tetraethyl titanate, wherein the specific method comprises the following steps: dissolving tetraethyl titanate in diethyl ether to obtain a tetraethyl titanate solution, dissolving polysaccharide in glacial acetic acid solution, mixing the glacial acetic acid solution dissolved with the polysaccharide 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 Fe 3 O 4 Drying the powder surface to obtain polysaccharide coated nano Fe 3 O 4 And (3) powder.
Preferably, wherein the second step is to make Fe 3 O 4 -TiO 2 Adding the mixed powder into a silane coupling agent solution, performing ultrasonic dispersion for 1-2 h, heating to 70-80 ℃ at an ultrasonic frequency of 40kHz, and then preserving heat for 30min to obtain silane coupling agent modified Fe 3 O 4 -TiO 2 The slurry was 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 deionized water is 1:103-115; fe (Fe) 3 O 4 -TiO 2 The 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 the Fe 3 O 4 -TiO 2 The mass ratio of the mixed slurry to the sphagnum charcoal is 1:45-75.
Preferably, the method for activating in the third step under nitrogen atmosphere comprises the following steps: will be sprayed with Fe 3 O 4 -TiO 2 Placing the mixed slurry of the sphagnum charcoal into a vacuum sealed container, wherein the vacuum degree is 1.27 multiplied by 10 -7 The pressure of the liquid is less than or equal to Pa,introducing nitrogen into the vacuum closed container, heating the vacuum closed container to 300-500 ℃ for 20min, and preserving the heat for 1-3 h.
Preferably, the method for determining the adsorption of strontium by the sphagnum charcoal adsorbent comprises the following steps: srCl 2 Dissolving in deionized water to prepare Sr stock solution with the concentration of 1000 mg/L; before using, the working solution is treated with HNO of 0.1mol/L 3 Adjusting the pH value to 2.0+/-0.1, and adopting a dynamic test scheme that 0.1g of the sphagnum charcoal adsorbent is put into 250ml of 500mg/L working solution, and sampling and measuring the solution concentration at 5, 10, 20, 40, 60, 90, 120, 150, 180, 360, 720, 1440 and 2880 minutes respectively; in the isothermal test, 0.1g of biochar is put into 100ml of working solution, and adsorption is carried out for 24 hours; all adsorption was performed in a constant temperature shaker at 25℃and shaking at 120rpm, filtered using a 0.45um microfiltration membrane and disposable syringe to give filtrate, and 0.1mol/L HNO was used 3 Diluting the filtrate; measuring Sr in diluted sample liquid by using an atomic absorption spectrometer acetylene-flame method, and measuring the biochar adsorption quantity Q at t time t Calculated from the following formula:
Figure GDA0004151092970000041
wherein C is 0 For the initial concentration of the working fluid, C t And v is the volume of the working solution in the adsorption process, and w is the adding amount of the sphagnum biochar adsorbent.
The invention at least comprises the following beneficial effects: the prepared sphagnum charcoal adsorbent 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 obtained sphagnum charcoal is released due to residual volatile components, pores on the surface of the material are well developed due to high temperature, and the sphagnum charcoal adsorbent obtained under the condition has a honeycomb structure, so that a space is provided for adsorbing and retaining pollutants. The surface of the obtained moss biochar adsorbent has a dense mesoporous structure, the mesopores play an important role in adsorption reaction, smaller mesopores can be used as charge absorption binding sites, and ion transport channels are usually carried out through larger mesopores, namely, the distribution and the number of the mesopores play an important role in adsorption reaction. The sphagnum powder is neutral, and the biochar obtained after high-temperature carbonization is alkaline, possibly the reduction of hydroxyl oxygen-containing functional groups on the surface after high-temperature carbonization is accompanied by the accumulation of alkali salts such as carbonate and nitrate on the surface. The EC of biochar is significantly increased compared to biomass, whereas the conductivity of the suspension depends on the salt concentration in the liquid, biomass has a higher ash content than biomass, whereas biochar with a higher ash content has a higher salt content, thus yielding a higher conductivity. The increase of the exchangeable cation content is more beneficial to the adsorption and retention of organic matters. The specific surface area of the biomass is obviously increased after high-temperature carbonization, which is the result of chemical reaction caused by carbonization, and can be explained that pores are formed on the surface of the material by removing volatile components in the carbonization process, the condensation degree of tar products is reduced, and core groups such as phenolic-OH, aromatic CO-and fatty alkyl in an aromatic structure are removed after high-temperature carbonization. The lower BET specific surface area and pore volume of the carbon precursor indicate that the starting material has more closed cells. Pyrolysis gives biomass a higher specific surface area, which is very favorable for adsorption. Meanwhile, the high-temperature carbonization process aggravates the formation of graphite carbon, the total content proportion of the graphite carbon in the functional carbon is improved, the graphite carbon has hydrophobicity, the increase of the proportion of the graphite carbon after carbonization also improves the hydrophobicity of the sphagnum biological carbon adsorbent, and the graphite structure can promote the formation of pi-pi bonds of organic molecules in the adsorption process, which is beneficial to the chemical adsorption process. After carbonization, the relative content of quinine carbonyl oxygen atoms in the biomass is reduced a lot, while the relative content of functional oxygen-containing functional groups on the surface is increased, which also enhances the chemisorption capability of the sphagnum biochar adsorbent in the adsorption action.
Polysaccharide coated nano Fe 3 O 4 The powder is prepared into slurry and is blasted on the surface of the sphagnum charcoal, so that the adsorption capacity of the outdoor sphagnum charcoal adsorbent is further improved; nano Fe 3 O 4 The powder surface is also provided with dense mesopores, and the coating and polycondensation process of the polysaccharide can accurately regulate and control nano Fe 3 O 4 The mesoporous density of the powder is reduced, and nano Fe is reduced 3 O 4 The aggregation of the powder, the polysaccharide is esterified by the tetraethyl titanate, so that the number of hydroxyl groups on the surface of the polysaccharide is reduced, namely, the polysaccharide is changed from hydrophilicity to hydrophilicity, and the adsorption capacity of strontium in the wastewater is improved. While in the use of polysaccharide for nano Fe 3 O 4 Before coating the powder, the gelatin solution is used for coating the nano Fe 3 O 4 Wetting the powder to improve nano Fe 3 O 4 The combination capability of the powder and polysaccharide ensures nano Fe in the subsequent activation and drying process 3 O 4 The powder does not separate from the polysaccharide. Silane coupling agent improves the TiO 2 Powder and nano Fe 3 O 4 Uniformity of powder mixing while TiO 2 The powder also has extremely high mesoporosity and extremely strong adsorption capacity, and is matched with nano Fe 3 O 4 The 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 the adsorption capacities of the sphagnum charcoal adsorbents prepared in examples 1 to 12 on strontium;
FIG. 2 is a surface scanning electron microscope image of a sphagnum charcoal biochar adsorbent prepared at a constant heating temperature of 400 ℃;
FIG. 3 is a surface scanning electron microscope image of a sphagnum charcoal biochar adsorbent prepared at a constant heating temperature of 600 ℃;
FIG. 4 is a surface scanning electron microscope image of a sphagnum charcoal biochar adsorbent prepared at a constant heating temperature of 800 ℃;
FIG. 5 is a surface scanning electron microscope image of a sphagnum charcoal biochar adsorbent prepared at a constant heating temperature of 1000 ℃;
FIG. 6 is a surface scanning electron microscope image of a sphagnum charcoal biochar adsorbent produced at a constant heating temperature of 1000 ℃;
FIG. 7 is a quasi-primary and quasi-secondary kinetic curve fit of adsorption kinetics of a sand snake biochar adsorbent to Sr;
FIG. 8 is an electron microscope scan of the surface of the sphagnum charcoal adsorbent prior to adsorption;
FIG. 9 is an electron microscope scan of the surface of the adsorbent of the sphagnum biological carbon after adsorption.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
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 biochar comprises the following steps of: washing with deionized water to remove dust and impurities of the sphagnum, drying the sphagnum at 105 ℃ for 6 hours, crushing and filtering with a 0.45mm screen; 5g of sphagnum was charged into a 120ml capacity ark, and the mixture was charged into a tube furnace at 60cm 3 And heating at constant temperature under the continuous nitrogen flow condition of/min, wherein the constant temperature heating temperature is 400 ℃, and the heating time is 60min.
Example 2
The preparation method of the sphagnum biochar comprises the following steps of: washing with deionized water to remove dust and impurities of the sphagnum, drying the sphagnum at 105 ℃ for 6 hours, crushing and filtering with a 0.45mm screen; 5g of sphagnum was charged into a 120ml capacity ark, and the mixture was charged into a tube furnace at 60cm 3 And heating at constant temperature under the continuous nitrogen flow condition of/min, wherein the constant temperature heating temperature is 400 ℃, and the heating time is 90min.
Example 3
The preparation method of the sphagnum biochar comprises the following steps of: make the following stepsWashing with deionized water to remove dust and impurities of the sphagnum, drying the sphagnum at 105 ℃ for 6 hours, crushing and filtering by using a 0.45mm screen; 5g of sphagnum was charged into a 120ml capacity ark, and the mixture was charged into a tube furnace at 60cm 3 And heating at constant temperature under the continuous nitrogen flow condition of/min, wherein the constant temperature heating temperature is 400 ℃, and the heating time is 120min.
Example 4
The preparation method of the sphagnum biochar comprises the following steps of: washing with deionized water to remove dust and impurities of the sphagnum, drying the sphagnum at 105 ℃ for 6 hours, crushing and filtering with a 0.45mm screen; 5g of sphagnum was charged into a 120ml capacity ark, and the mixture was charged into a tube furnace at 60cm 3 And heating at constant temperature under the continuous nitrogen flow condition of/min, wherein the constant temperature heating temperature is 600 ℃, and the heating time is 60min.
Example 5
The preparation method of the sphagnum biochar comprises the following steps of: washing with deionized water to remove dust and impurities of the sphagnum, drying the sphagnum at 105 ℃ for 6 hours, crushing and filtering with a 0.45mm screen; 5g of sphagnum was charged into a 120ml capacity ark, and the mixture was charged into a tube furnace at 60cm 3 And heating at constant temperature under the continuous nitrogen flow condition of/min, wherein the constant temperature heating temperature is 600 ℃, and the heating time is 90min.
Example 6
The preparation method of the sphagnum biochar comprises the following steps of: washing with deionized water to remove dust and impurities of the sphagnum, drying the sphagnum at 105 ℃ for 6 hours, crushing and filtering with a 0.45mm screen; 5g of sphagnum was charged into a 120ml capacity ark, and the mixture was charged into a tube furnace at 60cm 3 And heating at constant temperature under the continuous nitrogen flow condition of/min, wherein the constant temperature heating temperature is 600 ℃, and the heating time is 120min.
Example 7
The preparation method of the sphagnum biochar comprises the following steps of: washing with deionized water to remove dust and impurities of the sphagnum, drying the sphagnum at 105 ℃ for 6 hours,pulverizing and filtering with 0.45mm sieve; 5g of sphagnum was charged into a 120ml capacity ark, and the mixture was charged into a tube furnace at 60cm 3 And heating at constant temperature under the continuous nitrogen flow condition of/min, wherein the constant temperature heating temperature is 800 ℃, and the heating time is 60min.
Example 8
The preparation method of the sphagnum biochar comprises the following steps of: washing with deionized water to remove dust and impurities of the sphagnum, drying the sphagnum at 105 ℃ for 6 hours, crushing and filtering with a 0.45mm screen; 5g of sphagnum was charged into a 120ml capacity ark, and the mixture was charged into a tube furnace at 60cm 3 And heating at constant temperature under the continuous nitrogen flow condition of/min, wherein the constant temperature heating temperature is 800 ℃ and the heating time is 90min.
Example 9
The preparation method of the sphagnum biochar comprises the following steps of: washing with deionized water to remove dust and impurities of the sphagnum, drying the sphagnum at 105 ℃ for 6 hours, crushing and filtering with a 0.45mm screen; 5g of sphagnum was charged into a 120ml capacity ark, and the mixture was charged into a tube furnace at 60cm 3 And heating at constant temperature under the continuous nitrogen flow condition of/min, wherein the constant temperature heating temperature is 800 ℃, and the heating time is 120min.
Example 10
The preparation method of the sphagnum biochar comprises the following steps of: washing with deionized water to remove dust and impurities of the sphagnum, drying the sphagnum at 105 ℃ for 6 hours, crushing and filtering with a 0.45mm screen; 5g of sphagnum was charged into a 120ml capacity ark, and the mixture was charged into a tube furnace at 60cm 3 And heating at constant temperature under the continuous nitrogen flow condition of/min, wherein the constant temperature heating temperature is 1000 ℃ and the heating time is 60min.
Example 11
The preparation method of the sphagnum biochar comprises the following steps of: washing with deionized water to remove dust and impurities of the sphagnum, drying the sphagnum at 105 ℃ for 6 hours, crushing and filtering with a 0.45mm screen; 5g of sphagnum is filled into a square boat with 120ml capacity, and the square boat is filled into a tube furnaceIn 60cm 3 And heating at constant temperature under the continuous nitrogen flow condition of/min, wherein the constant temperature heating temperature is 1000 ℃ and the heating time is 90min.
Example 12
The preparation method of the sphagnum biochar comprises the following steps of: washing with deionized water to remove dust and impurities of the sphagnum, drying the sphagnum at 105 ℃ for 6 hours, crushing and filtering with a 0.45mm screen; 5g of sphagnum was charged into a 120ml capacity ark, and the mixture was charged into a tube furnace at 60cm 3 And heating at constant temperature under the continuous nitrogen flow condition of/min, wherein the constant temperature heating temperature is 1000 ℃ and the heating time is 120min.
Example 13
The preparation method of the sphagnum biochar comprises the following steps of: washing with deionized water to remove dust and impurities of the sphagnum, drying the sphagnum at 105 ℃ for 6 hours, crushing and filtering with a 0.45mm screen; 5g of sphagnum was charged into a 120ml capacity ark, and the mixture was charged into a tube furnace at 60cm 3 And heating at constant temperature under the continuous nitrogen flow condition of/min, wherein the constant temperature heating temperature is 1000 ℃ and the heating time is 90min.
Preparation of cellulose coated nano Fe 3 O 4 The powder specifically comprises the following steps:
step S21, weighing 10g of nano Fe according to parts by weight 3 O 4 Powder, using gelatin solution with mass fraction of 8% to perform nanometer Fe 3 O 4 Wetting the powder to obtain gelatin wetted nano Fe 3 O 4 Powder, gelatin solution 0.4g;
step S22, esterifying cellulose by using tetraethyl titanate, wherein the specific 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 dissolved with the cellulose 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 cellulose to 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 on gelatin-wetted nano Fe 3 O 4 Drying the powder surface to obtain cellulose coated nano Fe 3 O 4 A powder; wherein the dosage of cellulose is 0.2g;
with TiO 2 Powder as dopant, tiO 2 Powder incorporation of cellulose coated nano Fe 3 O 4 Powder to obtain Fe 3 O 4 -TiO 2 Mixing the powder; wherein, tiO 2 The powder dosage is 1g;
fe is added to 3 O 4 -TiO 2 Adding the mixed powder into methyltrimethoxysilane solution, performing ultrasonic dispersion for 1h, heating to 70 ℃ at ultrasonic frequency of 40kHz, and then preserving heat for 30min to react to obtain methyltrimethoxysilane modified Fe 3 O 4 -TiO 2 Mixing the slurry; wherein the mass ratio of the methyltrimethoxysilane to the deionized water is 1:103; fe (Fe) 3 O 4 -TiO 2 The mass ratio of the mixed powder to the methyltrimethoxysilane solution is 2:35;
1g of the prepared methyltrimethoxysilane-modified Fe was weighed out 3 O 4 -TiO 2 Spraying the mixed slurry on the surface of the sphagnum charcoal, washing with water, drying, and activating in a nitrogen atmosphere for 1h, wherein the specific method for activating comprises the following steps:
will be sprayed with Fe 3 O 4 -TiO 2 Placing the mixed slurry of the sphagnum charcoal into a vacuum sealed container, wherein the vacuum degree is 1.27 multiplied by 10 -7 And (3) introducing nitrogen into the vacuum sealed container below Pa, heating the vacuum sealed container to 300-500 ℃ for 20min, and preserving heat for 1h.
Thus, the sphagnum charcoal adsorbent is prepared.
Example 14
The preparation method of the sphagnum biochar comprises the following steps of: washing with deionized water to remove dust and impurities, oven drying at 105deg.C for 6 hr, pulverizing, and using 0.45mFiltering by using an m screen; 5g of sphagnum was charged into a 120ml capacity ark, and the mixture was charged into a tube furnace at 60cm 3 And heating at constant temperature under the continuous nitrogen flow condition of/min, wherein the constant temperature heating temperature is 1000 ℃ and the heating time is 90min.
Preparation of cellulose coated nano Fe 3 O 4 The powder specifically comprises the following steps:
step S21, weighing 20g of nano Fe according to parts by weight 3 O 4 Powder, using gelatin solution with mass fraction of 8% to perform nanometer Fe 3 O 4 Wetting the powder to obtain gelatin wetted nano Fe 3 O 4 Powder, gelatin solution 0.8g;
step S22, esterifying cellulose by using tetraethyl titanate, wherein the specific 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 dissolved with the cellulose 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%, the mass ratio of cellulose to glacial acetic acid solution is 1:110, and the mass fraction of the glacial acetic acid solution is 65%;
step S23, evaporating and concentrating the esterified cellulose solution to reduce the water content to 20%, and coating the evaporated cellulose on gelatin-wetted nano Fe 3 O 4 Drying the powder surface to obtain cellulose coated nano Fe 3 O 4 A powder; wherein the dosage of cellulose is 0.4g;
with TiO 2 Powder as dopant, tiO 2 Powder incorporation of cellulose coated nano Fe 3 O 4 Powder to obtain Fe 3 O 4 -TiO 2 Mixing the powder; wherein, tiO 2 The powder dosage is 1g;
fe is added to 3 O 4 -TiO 2 Adding the mixed powder into methyltrimethoxysilane solution, performing ultrasonic dispersion for 1.5h, performing ultrasonic frequency of 40kHz, heating to 75 ℃, and then performing heat preservation for 30min to obtain methyltrimethoxysilane modified Fe after reaction 3 O 4 -TiO 2 Mixing the slurry; wherein the mass ratio of the methyltrimethoxysilane to the deionized water is 1:110; fe (Fe) 3 O 4 -TiO 2 The mass ratio of the mixed powder to the methyltrimethoxysilane solution is 2:38;
1g of methyltrimethoxysilane-modified Fe was weighed out 3 O 4 -TiO 2 Spraying the mixed slurry on the surface of the sphagnum charcoal, washing with water, drying, and activating in a nitrogen atmosphere for 2 hours, wherein the specific method for activating comprises the following steps:
will be sprayed with Fe 3 O 4 -TiO 2 Placing the mixed slurry of the sphagnum charcoal into a vacuum sealed container, wherein the vacuum degree is 1.27 multiplied by 10 -7 And (3) introducing nitrogen into the vacuum sealed container below Pa, heating the vacuum sealed container to 300-500 ℃ for 20min, and preserving heat for 1h.
Thus, the sphagnum charcoal adsorbent is prepared.
Example 15
The preparation method of the sphagnum biochar comprises the following steps of: washing with deionized water to remove dust and impurities of the sphagnum, drying the sphagnum at 105 ℃ for 6 hours, crushing and filtering with a 0.45mm screen; 5g of sphagnum was charged into a 120ml capacity ark, and the mixture was charged into a tube furnace at 60cm 3 And heating at constant temperature under the continuous nitrogen flow condition of/min, wherein the constant temperature heating temperature is 1000 ℃ and the heating time is 90min.
Preparation of cellulose coated nano Fe 3 O 4 The powder specifically comprises the following steps:
step S21, weighing 40g of nano Fe according to parts by weight 3 O 4 Powder, using gelatin solution with mass fraction of 8% to perform nanometer Fe 3 O 4 Wetting the powder to obtain gelatin wetted nano Fe 3 O 4 Powder, gelatin solution 1.6g;
step S22, esterifying cellulose by using tetraethyl titanate, wherein the specific 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 dissolved with the cellulose 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 cellulose to 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 on gelatin-wetted nano Fe 3 O 4 Drying the powder surface to obtain cellulose coated nano Fe 3 O 4 A powder; wherein the dosage of cellulose is 0.8g;
with TiO 2 Powder as dopant, tiO 2 Powder incorporation of cellulose coated nano Fe 3 O 4 Powder to obtain Fe 3 O 4 -TiO 2 Mixing the powder; wherein, tiO 2 The powder dosage is 1g;
fe is added to 3 O 4 -TiO 2 Adding the mixed powder into methyltrimethoxysilane solution, performing ultrasonic dispersion for 2 hours, performing ultrasonic frequency of 40kHz, heating to 80 ℃, and then performing heat preservation for 30 minutes to react to obtain methyltrimethoxysilane modified Fe 3 O 4 -TiO 2 Mixing the slurry; wherein the mass ratio of the methyltrimethoxysilane to the deionized water is 1:115; fe (Fe) 3 O 4 -TiO 2 The mass ratio of the mixed powder to the methyltrimethoxysilane solution is 2:40;
1g of the prepared methyltrimethoxysilane-modified Fe was weighed out 3 O 4 -TiO 2 Spraying the mixed slurry on the surface of the sphagnum biochar, washing with water, drying, and activating in a nitrogen atmosphere for 3 hours, wherein the specific method for activating comprises the following steps: will be sprayed with Fe 3 O 4 -TiO 2 Placing the mixed slurry of the sphagnum charcoal into a vacuum sealed container, wherein the vacuum degree is 1.27 multiplied by 10 -7 And (3) introducing nitrogen into the vacuum sealed container below Pa, heating the vacuum sealed container to 300-500 ℃ for 20min, and preserving heat for 3h.
Thus, the sphagnum charcoal adsorbent is prepared.
The following methods were used for measurementAdsorption capacity of the obtained sphagnum charcoal adsorbent of examples 1 to 15 on strontium: srCl 2 Dissolving in deionized water to prepare Sr stock solution with the concentration of 1000 mg/L; before using, the working solution is treated with HNO of 0.1mol/L 3 Adjusting the pH value to 2.0+/-0.1, and adopting a dynamic test scheme that 0.1g of the sphagnum charcoal adsorbent is put into 250ml of 500mg/L working solution, and sampling and measuring the solution concentration at 5, 10, 20, 40, 60, 90, 120, 150, 180, 360, 720, 1440 and 2880 minutes respectively; in the isothermal test, 0.1g of biochar is put into 100ml of working solution, and adsorption is carried out for 24 hours; all adsorption was performed in a constant temperature shaker at 25℃and shaking at 120rpm, filtered using a 0.45um microfiltration membrane and disposable syringe to give filtrate, and 0.1mol/L HNO was used 3 Diluting the filtrate; the Sr in the diluted sample liquid is measured by an acetylene-flame method of an atomic absorption spectrometer, and the biochar adsorption quantity Qt at the time t is calculated by the following formula:
Figure GDA0004151092970000131
wherein C is 0 For the initial concentration of the working fluid, C t And v is the volume of the working solution in the adsorption process, and w is the adding amount of the sphagnum biochar adsorbent.
FIG. 1 is a graph showing comparison of adsorption capacities of the sphagnum charcoal adsorbents prepared in examples 1 to 12 on strontium, and as can be seen from FIG. 3, the engine oil of the sphagnum charcoal adsorbent prepared by high-temperature heating at 1000 ℃ and heat preservation for 90min has extremely high adsorption capacity. Fig. 2 to 4 show surface scanning electron microscope images of the sphagnum charcoal absorbent prepared by constant temperature heating at 400 ℃, 600 ℃ and 800 ℃, and fig. 5 and 6 show surface electron microscope ground images of the sphagnum charcoal absorbent prepared by constant temperature heating at 1000 ℃. As can be seen from fig. 5 and 6, the surface of the sphagnum charcoal adsorbent prepared at a high temperature of 1000 ℃ has a dense mesoporous structure, and thus has more excellent adsorption capacity. FIG. 7 is a quasi-first and quasi-second order kinetic curve fit of adsorption kinetics of the SrSizer biochar adsorbent, adsorption reached substantial stability at 12h, and adsorption of SrSizer carbon was highly efficient before 240 min. The adsorption model of the sphagnum carbon to the strontium solution is closer to a quasi-secondary kinetic model, as shown in table 1, R2 is more than 0.93, which indicates that the material has more saturated sites, the composite effect of multiple adsorption mechanisms is expressed, and the adsorption type is more preferential to chemical adsorption rather than physical adsorption. Prior to Sr adsorption, the surface of the sphagnum biochar was smooth and the pore distribution of the surface structure was evident, as shown in fig. 8. After the strontium solution is adsorbed, the surface structure of the material is obviously filled, and the surface of the material is covered by a film, as shown in fig. 9, the smaller pores on the surface of the adsorbed material are filled, and the surface of the material of the biochar for adsorbing the Sr is compact and smooth.
Table 5 first and second order kinetic parameters of Sr adsorption on a sphagnum charcoal adsorbent
Figure GDA0004151092970000141
The significance of the test data is analyzed and counted by adopting a One-way variance (One-ANOVA) in software SPSS (26.0), the infrared data is analyzed by using OMNIC software, and all the data are the mean value and standard deviation obtained by three test repetition. The chart is drawn with excel (2019) and origin (2019 b).
The dynamics data are fitted by using a Lagergren pseudo-primary dynamics model and a pseudo-secondary dynamics model,
Figure GDA0004151092970000142
Figure GDA0004151092970000143
wherein q e Is the adsorption quantity (mg/g) and q of the biochar adsorbent at the adsorption equilibrium t The adsorption quantity (mg/g) and k of the biochar adsorbent at the moment t 1 And k 2 The rates of primary and secondary dynamics, respectivelyA constant.
The isothermal adsorption model is fitted by using two models of Langmuir and Freundlich,
Figure GDA0004151092970000144
Figure GDA0004151092970000145
wherein C is e Is the concentration of Sr in the solution at equilibrium, and in a Langmuir isothermal model, the affinity correlation coefficient of solute and adsorbent is KL, q max Maximum adsorption (mg/g); KF is the predicted adsorption capacity according to the Freundlich isothermal model and adsorption strength measurement.
The adsorption capacity of the sphagnum charcoal adsorbents prepared in example 11, example 13, example 14 and example 15 on strontium was compared with that of the existing materials, and the comparison results are shown in table 2:
TABLE 2 maximum adsorption capacity comparison of the inventive sphagnum charcoal adsorbent and the prior art materials for strontium
Figure GDA0004151092970000151
The result shows that the maximum adsorption capacity of the obtained sphagnum charcoal adsorbent to Sr reaches more than 225mg/g at room temperature (25 ℃), and the Fe is coated by polysaccharide 3 O 4 -TiO 2 The adsorption capacity of the mixed slurry spray treated sphagnum charcoal adsorbent to strontium can even reach 247.1mg/g, which is obviously superior to the existing adsorption material.
The number of equipment and the scale of processing described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be readily apparent to those skilled in the art.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.

Claims (9)

1. The preparation method of the sphagnum charcoal adsorbent is characterized by comprising the following steps: the preparation method of the sphagnum biochar comprises the following steps of: washing with deionized water to remove dust and impurities of the sphagnum, drying the sphagnum at 105 ℃ for 6 hours, crushing and filtering with a 0.45mm screen; 5g of sphagnum was charged into a 120ml capacity ark, and the mixture was charged into a tube furnace at 60cm 3 Heating at constant temperature under the continuous nitrogen flow condition for/min, wherein the constant temperature heating temperature is 400-1000 ℃ and the heating time is 60-120 min;
the method also comprises the following steps:
step one, preparing polysaccharide coated nano Fe 3 O 4 Powder and TiO 2 Powder as dopant, tiO 2 Powder incorporation of polysaccharide coated nano Fe 3 O 4 Powder to obtain Fe 3 O 4 -TiO 2 Mixing the powder; wherein, tiO 2 Powder and nano Fe 3 O 4 The mass ratio of the powder is 1:10-40, and the polysaccharide and the nanometer Fe 3 O 4 The mass ratio of the powder is 1:50;
step two, fe 3 O 4 -TiO 2 Adding the mixed powder into a silane coupling agent solution, and reacting to obtain silane coupling agent modified Fe 3 O 4 -TiO 2 Mixing the slurry;
step three, modifying Fe with the silane coupling agent prepared in the step three 3 O 4 -TiO 2 Spraying the mixed slurry on the surface of the sphagnum charcoal, washing with water, drying, and activating in nitrogen atmosphere for 1-3 h to obtain the sphagnum charcoal adsorbent.
2. The method as claimed in claim 1The preparation method of the sphagnum charcoal adsorbent is characterized in that polysaccharide coated nano Fe in the first step 3 O 4 The preparation method of the powder comprises the following steps:
step S21, weighing 10-40 parts of nano Fe according to parts by weight 3 O 4 Powder, using gelatin solution with mass fraction of 8% to perform nanometer Fe 3 O 4 Wetting the powder to obtain gelatin wetted nano Fe 3 O 4 Powder, gelatin solution and nano Fe 3 O 4 The mass ratio of the powder is 1:23-27;
step S22, esterifying polysaccharide by using tetraethyl titanate, wherein the specific method comprises the following steps: dissolving tetraethyl titanate in diethyl ether to obtain a tetraethyl titanate solution, dissolving polysaccharide in glacial acetic acid solution, mixing the glacial acetic acid solution dissolved with the polysaccharide 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 Fe 3 O 4 Drying the powder surface to obtain polysaccharide coated nano Fe 3 O 4 And (3) powder.
3. The method for preparing a sphagnum charcoal adsorbent according to claim 1, wherein in the second step, fe is added 3 O 4 -TiO 2 Adding the mixed powder into a silane coupling agent solution, performing ultrasonic dispersion for 1-2 h, heating to 70-80 ℃ at an ultrasonic frequency of 40kHz, and then preserving heat for 30min to obtain silane coupling agent modified Fe 3 O 4 -TiO 2 The slurry was mixed.
4. The method of preparing a sphagnum charcoal adsorbent of claim 1, wherein the polysaccharide is one of dextran, cellulose, chitosan, or acacia.
5. The method for preparing a sphagnum charcoal adsorbent according to claim 1, wherein the silane coupling agent is alpha-methylOne of the group trimethoxysilane, diphenylmethylsilane or methyldichlorosilane; in the silane coupling agent solution, the mass ratio of the silane coupling agent to deionized water is 1:103-115; fe (Fe) 3 O 4 -TiO 2 The mass ratio of the mixed powder to the silane coupling agent solution is 2:35-40.
6. The method for preparing the sphagnum charcoal adsorbent according to claim 2, wherein the mass fraction of the tetraethyl titanate solution is 30-36%, the mass ratio of polysaccharide to glacial acetic acid solution is 1:110, and the mass fraction of the glacial acetic acid solution is 60-80%.
7. The method for preparing a sphagnum charcoal adsorbent according to claim 2, wherein the Fe 3 O 4 -TiO 2 The mass ratio of the mixed slurry to the sphagnum charcoal is 1:45-75.
8. The method for preparing the sphagnum charcoal adsorbent according to claim 2, wherein the method for activating the sphagnum charcoal adsorbent in the third step comprises: will be sprayed with Fe 3 O 4 -TiO 2 Placing the mixed slurry of the sphagnum charcoal into a vacuum sealed container, wherein the vacuum degree is 1.27 multiplied by 10 -7 And (3) introducing nitrogen into the vacuum sealed container below Pa, heating the vacuum sealed container to 300-500 ℃ for 20min, and preserving the heat for 1-3 h.
9. The method for preparing the sphagnum charcoal adsorbent according to claim 1, wherein the method for determining the strontium adsorption of the sphagnum charcoal adsorbent comprises the following steps: srCl 2 Dissolving in deionized water to prepare Sr stock solution with the concentration of 1000 mg/L; before using, the working solution is treated with HNO of 0.1mol/L 3 Adjusting the pH value to 2.0+/-0.1, and adopting a dynamic test scheme that 0.1g of the sphagnum charcoal adsorbent is put into 250ml of 500mg/L working solution, and sampling and measuring the solution concentration at 5, 10, 20, 40, 60, 90, 120, 150, 180, 360, 720, 1440 and 2880 minutes respectively; in the isothermal test, 0.1g of biochar was addedAdding into 100ml of working solution, and adsorbing for 24 hours; all adsorption was performed in a constant temperature shaker at 25℃and shaking at 120rpm, filtered using a 0.45 μm microfiltration membrane and a disposable syringe to give filtrate, and 0.1mol/L HNO was used 3 Diluting the filtrate; measuring Sr in diluted sample liquid by using an atomic absorption spectrometer acetylene-flame method, and measuring the biochar adsorption quantity Q at t time t Calculated from the following formula:
Figure FDA0004131248040000031
wherein C is 0 For the initial concentration of the working fluid, C t And v is the volume of the working solution in the adsorption process, and w is the adding amount of the sphagnum biochar adsorbent.
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