CN115304050B - Preparation method of citrus peel biochar and application of citrus peel biochar in aspect of wastewater treatment - Google Patents
Preparation method of citrus peel biochar and application of citrus peel biochar in aspect of wastewater treatment Download PDFInfo
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- 241000207199 Citrus Species 0.000 title claims abstract description 50
- 235000020971 citrus fruits Nutrition 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000004065 wastewater treatment Methods 0.000 title abstract description 8
- 239000013078 crystal Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000001035 drying Methods 0.000 claims abstract description 12
- 239000002351 wastewater Substances 0.000 claims abstract description 9
- 238000005406 washing Methods 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000007873 sieving Methods 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000012153 distilled water Substances 0.000 claims description 8
- 238000003837 high-temperature calcination Methods 0.000 claims description 6
- 241001672694 Citrus reticulata Species 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 4
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000001354 calcination Methods 0.000 abstract description 5
- 238000010923 batch production Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 description 30
- 239000000975 dye Substances 0.000 description 19
- 239000000243 solution Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- 244000276331 Citrus maxima Species 0.000 description 5
- 235000001759 Citrus maxima Nutrition 0.000 description 5
- 238000002835 absorbance Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000006228 supernatant Substances 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000000643 oven drying Methods 0.000 description 4
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 description 3
- 239000003463 adsorbent Substances 0.000 description 3
- IQFVPQOLBLOTPF-HKXUKFGYSA-L congo red Chemical compound [Na+].[Na+].C1=CC=CC2=C(N)C(/N=N/C3=CC=C(C=C3)C3=CC=C(C=C3)/N=N/C3=C(C4=CC=CC=C4C(=C3)S([O-])(=O)=O)N)=CC(S([O-])(=O)=O)=C21 IQFVPQOLBLOTPF-HKXUKFGYSA-L 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000005360 mashing Methods 0.000 description 3
- STZCRXQWRGQSJD-GEEYTBSJSA-M methyl orange Chemical compound [Na+].C1=CC(N(C)C)=CC=C1\N=N\C1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-GEEYTBSJSA-M 0.000 description 3
- 229940012189 methyl orange Drugs 0.000 description 3
- 229960000907 methylthioninium chloride Drugs 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 description 3
- 229940043267 rhodamine b Drugs 0.000 description 3
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000010170 biological method Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003610 charcoal Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000002211 ultraviolet spectrum Methods 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 206010070834 Sensitisation Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000001000 anthraquinone dye Substances 0.000 description 1
- 239000000987 azo dye Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
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- 238000002848 electrochemical method Methods 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000008313 sensitization Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
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- 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
-
- 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
- B01J20/20—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
-
- 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
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- 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
- B01J2220/4875—Sorbents characterised by the starting material used for their preparation the starting material being a waste, residue or of undefined composition
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- 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
- B01J2220/4875—Sorbents characterised by the starting material used for their preparation the starting material being a waste, residue or of undefined composition
- B01J2220/4887—Residues, wastes, e.g. garbage, municipal or industrial sludges, compost, animal manure; fly-ashes
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- 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
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention relates to the technical field of dye wastewater treatment, and particularly discloses a preparation method of citrus peel biochar and application of the citrus peel biochar in wastewater treatment. The preparation method of the citrus peel biochar comprises the following steps: washing orange peel with water, sequentially drying, crushing, sieving with a 40-100 mesh sieve, calcining at 300-800 ℃ for 0.5-3.0 h, cooling to room temperature, washing with water, and drying to obtain the orange peel biochar. The citrus peel biochar can efficiently adsorb crystal violet in wastewater, has the advantages of simple preparation method, wide raw material sources, low price and low probability of causing secondary pollution, can realize batch production, and has great potential practical application value.
Description
Technical Field
The invention relates to the technical field of dye wastewater treatment, in particular to a preparation method of citrus peel biochar and application thereof in wastewater treatment.
Background
With the improvement of living standard and the rapid development of industry, dyes are widely used in industries such as textile, papermaking, printing, food, medicine, cosmetics and the like, the use amount is greatly increased, and investigation shows that the production amount, the use amount, the export amount and the like of the dyes in the current stage of China are in the first place of the world, and serious threat is generated to the ecological environment and the health of human beings. Most dyes belong to organic matters with benzene ring structures, have great harm and have toxic and side effects such as cancer, sensitization and outburst. The crystal violet is a typical triphenylmethane cationic dye, is the dye with the third largest usage amount after azo dye and anthraquinone dye, has good chemical stability when discharged into the environment, and is difficult to degrade by a conventional biological method. Therefore, the search for an effective way to treat dye wastewater is one of the hot problems of research and attention today.
The existing wastewater treatment methods mainly comprise an adsorption method, an electrochemical method, a biological method and the like. The adsorption method has the advantages of simple operation, good purification effect, low price, recycling, no secondary pollution and the like, so the adsorption method has become one of the most promising technical means for treating industrial dye wastewater.
Disclosure of Invention
The invention aims to provide a preparation method of citrus peel biochar and application thereof in treating dye wastewater. The biochar prepared by using the citrus peel as a carbon source has larger specific surface area and developed pore structure, can specifically adsorb crystal violet dye, and has good economic benefit and environmental benefit.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a preparation method of citrus peel biochar comprises the following steps:
washing pericarp (preferably ripe pericarp) of citrus (Citrus reticulata Blanco) with water, oven drying, pulverizing, sieving, calcining at high temperature, cooling to room temperature, washing with water, and oven drying to obtain biochar.
Further, the water is distilled water.
Further, the drying conditions are as follows: drying at 60-100 deg.c for 6-12 hr; preferably, the drying conditions are: drying at 85-90 deg.c for 10-12 hr.
Further, the orange peel is crushed and then sieved by a sieve with 40-100 meshes; preferably, the mixture is sieved by a sieve of 80 to 100 meshes.
Further, the conditions for high-temperature calcination of the citrus peel powder are as follows: heating to 300-800 deg.c from room temperature for 0.5-3.0 hr.
Further, the conditions for high-temperature calcination of the citrus peel powder are as follows: heating to 600-700 deg.c from room temperature for 1.0-2.0 hr.
Preferably, the conditions for high temperature calcination of the citrus peel powder are: the temperature is raised to 700 ℃ from room temperature, and the heat preservation time is 2.0h.
Further, the heating rate in the high-temperature calcination process of the citrus peel powder is 1-10 ℃/min.
The citrus peel biochar prepared by the preparation method is applied to dye wastewater treatment.
Further, the dye in the dye wastewater comprises crystal violet and can further comprise at least one of methylene blue, congo red, rhodamine B and methyl orange.
Further, in specific application, the method comprises the following steps: and adding the citrus peel biochar into dye wastewater, stirring, and performing adsorption reaction.
Further, the pH value of the dye wastewater is 3-10.
Furthermore, the adding amount of the citrus peel biochar is more than 0.03 g/L.
Further, the temperature of the adsorption reaction is 20 to 60 ℃, and in the temperature range, the dye removal rate is less affected by temperature change.
Further, the adsorption reaction time is more than 10min, the adsorption time reaches adsorption equilibrium about 60min, and the dye removal rate reaches 99.73%.
Compared with the prior art, the invention has the advantages and beneficial effects that:
the orange peel biochar can efficiently adsorb crystal violet in wastewater, has the advantages of simple preparation method, wide raw material sources, low price and difficult secondary pollution, can realize batch production, has great potential practical application value, provides a way for effectively utilizing orange peel, fully utilizes biomass resources, and achieves the purposes of treating waste with waste and changing waste into valuable.
Drawings
FIG. 1 is a scanning electron microscope image of the citrus peel biochar prepared in example 2;
FIG. 2 is a scanning electron microscope image of citrus peel biochar after adsorption reaction;
FIG. 3 is a graph showing the color change of crystal violet solution before and after the adsorption reaction;
FIG. 4 is a graph showing the variation of ultraviolet spectra of crystal violet solutions before and after the adsorption reaction;
FIG. 5 is a graph showing the effect of the initial concentration of crystal violet on the performance of adsorption removal of crystal violet by citrus peel biochar;
FIG. 6 is a graph showing the effect of crystal violet solution pH on the performance of citrus peel biochar adsorption to remove crystal violet;
FIG. 7 is a graph showing the effect of adsorption time on the performance of citrus peel biochar in removing crystal violet by adsorption.
Detailed Description
The technical scheme of the invention is further described below with reference to the embodiment and the attached drawings.
Example 1
Cleaning collected fresh mature citrus (Citrus reticulata Blanco) peel with tap water and distilled water, cutting, drying at 85 ℃ for 12 hours in a forced air oven, crushing the dried peel into powder by a pulverizer, sieving by a 100-mesh sieve, placing the sieved powder into a muffle furnace, heating to 400 ℃ from room temperature at a heating rate of 10 ℃/min, calcining at constant temperature for 2 hours, taking out, mashing after cooling to room temperature, washing with distilled water, filtering, and drying at 85 ℃ in the forced air oven to obtain the citrus peel biochar.
Example 2
Cleaning collected fresh mature citrus (Citrus reticulata Blanco) peel with tap water and distilled water, cutting, drying at 85 ℃ for 12 hours in a forced air oven, crushing the dried peel into powder by a pulverizer, sieving by 80 meshes, placing the sieved powder in a muffle furnace, heating to 700 ℃ from room temperature at a heating rate of 10 ℃/min, calcining at constant temperature for 2 hours, taking out, mashing after cooling to room temperature, washing with distilled water, filtering, and drying at 85 ℃ in the forced air oven to obtain the citrus peel biochar. The scanning electron microscope diagram is shown in figure 1. The citrus peel biochar has an average pore diameter of 0.6955nm and a specific surface area (Langmuir specific surface area) of 600-700m 2 /g。
Comparative example 1
Cleaning the collected fresh shaddock peel (Citrus maxima (Burm.) Merr.) with tap water and distilled water, cutting, oven drying at 85deg.C for 12 hr, pulverizing the dried peel into powder, sieving with 80 mesh sieve, placing the sieved powder in muffle furnace, heating to 700deg.C at heating rate of 10deg.C/min, calcining at constant temperature for 2 hr, cooling to room temperature, taking out, mashing, washing with distilled water, suction filtering, and oven drying at 85deg.C to obtain shaddock peel biochar.
The following dye adsorption experiments were performed using the citrus peel biochar prepared in example 2 as an adsorbent material.
The following application example calculates the adsorption capacity of the adsorbent according to formula (1), and calculates the removal rate of the adsorbent according to formula (2).
q is the absorption capacity of the citrus peel biochar to crystal violet, mg/g;
C 0 initial concentration of crystal violet, mg/L;
C t concentration of residual crystal violet after adsorption, mg/L;
v is the volume of crystal violet solution, L;
m is the mass of the added citrus peel biochar, g;
eta is the removal rate of crystal violet by the orange peel biochar.
Application example 1
Crystal violet aqueous solutions with the concentrations of 10mg/L, 30mg/L, 50mg/L, 70mg/L and 90mg/L are accurately prepared in 25mL colorimetric tubes respectively, the volume is fixed to 25mL, then 0.03g of the citrus peel biochar prepared in example 2 is added into the colorimetric tubes respectively, the mixture is stirred in a constant-temperature water bath at 25 ℃ for 1h, the centrifugation is carried out, and the absorbance of the supernatant is measured by an ultraviolet spectrophotometer. Electron microscopy scanning is performed on the citrus peel biochar adsorbed with crystal violet, as shown in fig. 2. The color change pattern of the crystal violet solution before and after the adsorption reaction is shown in fig. 3, the left pattern is before adsorption, and the right pattern is after adsorption. The ultraviolet spectrum change curves of the crystal violet solution before and after the adsorption reaction are shown in fig. 4.
The effect of the initial concentration of crystal violet on the adsorption removal performance of the citrus peel biochar is shown in fig. 5, and the removal rates of the initial concentration of crystal violet at 10mg/L, 30mg/L, 50mg/L, 70mg/L and 90mg/L are respectively as follows: 99.20%, 99.64%, 83.27%, 63.27% and 58.17%. When the initial concentration of crystal violet is 30mg/L, the crystal violet removal rate is highest, and the removal rate reaches 99.64%.
As a comparison: accurately preparing crystal violet water solution with the concentration of 30mg/L in a 25mL colorimetric tube, fixing the volume to 25mL, adding 0.03g of the shaddock peel biochar prepared in the comparative example 1 into the colorimetric tube, stirring for 1h in a constant-temperature water bath at 25 ℃, centrifuging, and measuring the absorbance of the supernatant by an ultraviolet spectrophotometer.
The removal rate of the shaddock peel charcoal to crystal violet is 72.26 percent.
Application example 2
Preparing crystal violet aqueous solutions with initial pH values of 3, 4, 5, 6, 7, 8, 9 and 10 and concentration of 30mg/L respectively in 25mL colorimetric tubes, and uniformly sizing to 25mL, wherein the pH of the solutions is adjusted by 0.1mol/LHCl and 0.1 mol/LNaOH; then, 0.03g of the citrus peel charcoal prepared in example 2 was added to a cuvette, and the cuvette was stirred in a constant-temperature water bath at 25℃for 1 hour, centrifuged, and the absorbance of the supernatant was measured with an ultraviolet spectrophotometer.
The effect of the pH value of the crystal violet solution on the performance of removing the crystal violet by adsorption of the citrus peel biochar is shown in fig. 6, and the removal rates corresponding to the pH values of the crystal violet solution of 3, 4, 5, 6, 7, 8, 9 and 10 are respectively as follows: 99.65%, 99.63%, 99.66%, 99.62%, 99.66%, 99.63% and 99.59%. Namely, the pH value of the crystal violet aqueous solution is in the range of 3-10, and the removal rate of the citrus peel biochar on the crystal violet is over 99.5 percent.
Application example 3
9 parts of crystal violet aqueous solution with the concentration of 30mg/L, pH value of 8 are accurately prepared in a 25mL colorimetric tube, the volume is fixed to 25mL, 0.03g of the citrus peel biochar prepared in example 2 is added into each part, and the mixture is placed in a constant-temperature stirring water bath at 25 ℃ for stirring. Stirring for 10, 20, 30, 40, 50, 60, 70, 90 and 120 minutes, respectively, centrifuging after stirring, and measuring absorbance of the supernatant with an ultraviolet spectrophotometer.
The effect of adsorption time on the performance of the citrus peel biochar in removing crystal violet by adsorption is shown in fig. 7, and the removal rate of the citrus peel biochar on crystal violet increases with the increase of adsorption time; when the adsorption is carried out for 60 minutes, the adsorption balance is achieved, the removal rate of the citrus peel biochar to crystal violet reaches 99.73 percent, and the adsorption capacity is 15.86mg/g.
Application example 4
Respectively accurately preparing a crystal violet water solution with the concentration of 30mg/L, a methylene blue water solution with the concentration of 30mg/L, a Congo red water solution with the concentration of 30mg/L, a rhodamine B water solution with the concentration of 30mg/L and a methyl orange water solution with the concentration of 30mg/L in a 25mL colorimetric tube, respectively adding 0.03g of the citrus peel biochar prepared in the example 2 into the colorimetric tube, stirring for 1h in a constant-temperature water bath at 25 ℃, centrifuging, and measuring the absorbance of the supernatant by an ultraviolet spectrophotometer.
The removal rates of the citrus peel biochar on different dyes are respectively as follows: 75.51% of methylene blue, 22.73% of Congo red, 28.68% of rhodamine B, 28.89% of methyl orange and 99.64% of crystal violet.
The above description is of a preferred embodiment of the present invention, but it is not limited to the application of the embodiment shown in the specification, but can be modified and modified without departing from the principle of the invention, and the modification and modification should be considered as the protection scope of the invention.
Claims (3)
1. The application of the citrus peel biochar in treating crystal violet in dye wastewater with the pH value of 3-10 is characterized in that the preparation method of the citrus peel biochar comprises the following steps:
and (3) cleaning the peel of the mature citrus Citrus reticulata Blanco with water, drying at 85-90 ℃ for 10-12 hours, crushing, sieving with a 80-100 mesh sieve to obtain citrus peel powder, heating to 700 ℃ for high-temperature calcination for 2.0 hours, cooling to room temperature, washing with water, and drying to obtain the citrus peel biochar.
2. Use according to claim 1, characterized in that the temperature rise rate during the high temperature calcination of the citrus peel powder is 1-10 ℃/min.
3. The use according to claim 1, wherein the water is distilled water.
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