CN116062830A - Method for removing chemical oxygen demand in wastewater by utilizing modified soybean straw biochar - Google Patents
Method for removing chemical oxygen demand in wastewater by utilizing modified soybean straw biochar Download PDFInfo
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- 239000010902 straw Substances 0.000 title claims abstract description 103
- 244000068988 Glycine max Species 0.000 title claims abstract description 97
- 235000010469 Glycine max Nutrition 0.000 title claims abstract description 97
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 59
- 239000001301 oxygen Substances 0.000 title claims abstract description 59
- 239000000126 substance Substances 0.000 title claims abstract description 58
- 239000002351 wastewater Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 36
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims abstract description 34
- 229910000027 potassium carbonate Inorganic materials 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 239000012153 distilled water Substances 0.000 claims description 20
- 238000002360 preparation method Methods 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 10
- 238000000197 pyrolysis Methods 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 229910052573 porcelain Inorganic materials 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 238000000967 suction filtration Methods 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims 1
- 238000001179 sorption measurement Methods 0.000 abstract description 19
- 230000000694 effects Effects 0.000 abstract description 7
- 239000002994 raw material Substances 0.000 abstract description 4
- 238000000354 decomposition reaction Methods 0.000 abstract description 2
- 240000008042 Zea mays Species 0.000 description 3
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 3
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 3
- 235000005822 corn Nutrition 0.000 description 3
- 238000003795 desorption Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910003481 amorphous carbon Inorganic materials 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000010871 livestock manure Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000011197 physicochemical method Methods 0.000 description 1
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- 239000002699 waste material Substances 0.000 description 1
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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
- 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
- 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
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/02—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
-
- 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
- B01J2220/4825—Polysaccharides or cellulose materials, e.g. starch, chitin, sawdust, wood, straw, cotton
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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Abstract
A method for removing chemical oxygen demand in wastewater by utilizing modified soybean straw biochar relates to a method for removing chemical oxygen demand in wastewater. The invention aims to overcome the difficulties of complex chemical oxygen demand components and difficult decomposition in wastewater; solves the problems of high cost and poor removal effect of the traditional chemical oxygen demand adsorption method. The method comprises the following steps: the modified soybean straw biochar with excellent adsorption performance is obtained by modifying soybean straw by using potassium carbonate as a raw material, and the modified soybean straw biochar is added into wastewater to oscillate, so that the removal of chemical oxygen demand in the wastewater is completed. The method has low cost, obvious effect of removing the chemical oxygen demand in the wastewater and good application prospect.
Description
Technical Field
The invention relates to a method for removing chemical oxygen demand in wastewater by utilizing modified soybean straw biochar.
Background
Chemical oxygen demand is an indicator of how much reducing material is in water. The most predominant reducing species in water is organic, so chemical oxygen demand is often used to balance the organic content of water. The larger the chemical oxygen demand, the more serious the pollution of the water body by the organic matters. When the chemical oxygen demand in the water body is too high, the water body can be endangered, and even the ecological balance system is affected seriously. Therefore, the effective removal of chemical oxygen demand from wastewater has become a global issue that is urgently needed to be addressed. However, due to the complex chemical oxygen demand composition, decomposition is difficult and the chemical oxygen demand in the wastewater is often difficult to treat. Various methods for removing chemical oxygen demand have been developed, including adsorption, chemical coagulation, electrochemical, oxidation, biological, micro-electrolysis, and the like. For example, in the disclosed invention patent (application No. 201810890932.6) a method for efficiently removing chemical oxygen demand from pulping wastewater is disclosed, which uses flocculation reaction and Fenton oxidation reaction to remove chemical oxygen demand from pulping wastewater, but the method has the problems of high cost, complex operation and the like. At present, the adsorption method is considered to be an excellent physicochemical method for removing chemical oxygen demand in wastewater because of the advantages of high efficiency, simple operation, strong applicability and the like. However, the existing adsorption method for removing the chemical oxygen demand generally has high cost and poor removal effect, so the invention is particularly important to a method for removing the chemical oxygen demand in the wastewater with low cost and high efficiency.
The biochar is a solid product generated by high-temperature thermal cracking of biomass in an anoxic or anaerobic environment, has good adsorption performance, and can be used for removing pollutants, for example, a method for removing lead in a water body by using magnetic pig manure biochar is disclosed in the published patent application of the invention (application number 201711446967.2). Straw is one of many biochar raw materials, and for example, a method for preparing biochar by using corn straw is disclosed in the published patent application of the invention of a preparation method of modified corn straw biochar and application of the modified corn straw biochar in phosphorus-containing wastewater (application number 202010965133.8). The biochar synthesized by using the straw as the raw material has excellent adsorption performance, low cost and simple synthesis, and can be widely applied. The invention provides a method for removing chemical oxygen demand in wastewater by utilizing modified soybean straw biochar, which has low cost, obvious removal effect and wide application prospect.
Disclosure of Invention
In order to solve the problems of high cost and poor removal effect of the traditional chemical oxygen demand adsorption method, the invention provides a method for removing chemical oxygen demand in wastewater by utilizing modified soybean straw biochar.
A method for removing chemical oxygen demand in wastewater by utilizing modified soybean straw biochar comprises the following steps: filtering the obtained wastewater to remove solid impurities, adding the modified soybean straw biochar into the wastewater to be treated, oscillating for 10-60 min at an oscillating speed of 90-110 rpm, and then filtering and separating to remove chemical oxygen demand in the wastewater to be treated, thereby obtaining the wastewater after treatment;
the preparation method of the modified soybean straw biochar is specifically completed according to the following steps:
1. preparing modified soybean straw: cutting soybean straw into small blocks, washing with distilled water to remove dust impurities, drying in an oven at 45-55 ℃ for 23-25 h, and crushing the dried soybean straw with a crusher; dissolving potassium carbonate in distilled water, adding crushed soybean straw, uniformly stirring, and drying in an oven at 75-85 ℃ for 7-9 h to obtain modified soybean straw; the mass ratio of the potassium carbonate to the distilled water for dissolving the potassium carbonate in the first step is 1g: (10 mL-11 mL); the mass ratio of the potassium carbonate to the crushed soybean straw in the first step is 1g: (0.9 g-1.1 g);
2. preparing modified soybean straw biochar: putting the modified soybean straw prepared in the first step into a porcelain boat, then putting the porcelain boat into a tube furnace, and heating at a pyrolysis temperature of 550-650 ℃ and a heating rate of 9-11 ℃/min for 1.5-2.5 h and keeping the temperature constant for N 2 Pyrolyzing at a flow rate of 40-50 mL/min; after pyrolysis is finished and cooled, the synthesized black powdery untreated modified soybean straw biochar is washed for 10 to 20 minutes by distilled water under the condition that the stirring speed is 190 to 210 rpm. After stirring, standing until the solid is precipitated, removing supernatant, continuously adding distilled water, stirring and washing until the pH value of the solution is neutral, and then carrying out suction filtration by using a circulating water type vacuum pumpAnd (3) placing the modified soybean straw biochar subjected to suction filtration in an oven at 45-55 ℃ for drying for 3-5 hours to obtain the modified soybean straw biochar.
The invention has the advantages that: 1. the invention provides a method for removing chemical oxygen demand in wastewater by utilizing modified soybean straw biochar, which widens the way of controlling the chemical oxygen demand in wastewater, has low cost and obvious removal effect, and has higher feasibility; 2. the soybean straw is used as the raw material, so that the method is environment-friendly, wide in source and low in price, realizes recycling of waste, and provides a new way for producing valuable straw derivative products; 3. the preparation method of the modified soybean straw biochar is simple, and the conditions are easy to control; the preparation process utilizes potassium carbonate to modify the soybean straw, the aromaticity of the modified soybean straw biochar is enhanced, more oxygen-containing functional groups are generated, and the removal rate of the modified soybean straw biochar on chemical oxygen demand is further increased in the modes of electrostatic action, hydrogen bond action, pi-pi interaction and the like; 4. the method has the advantages that the time for removing the chemical oxygen demand in the wastewater is short, the removal can be completed within 10-60 min, and the removal rate is up to 91%; 5. the separated modified soybean straw biochar can be repeatedly used for more than 5 times through desorption, so that the repeated recycling of the modified soybean straw biochar is realized.
Drawings
FIG. 1 is a scanning electron microscope image of the modified soybean straw biochar prepared in example 1; as can be seen from fig. 1, the modified soybean straw biochar has a rich pore structure, which helps to expose more adsorption sites, thereby improving adsorption capacity;
FIG. 2 is an X-ray diffraction pattern of the modified soybean straw biochar prepared in example 1; as can be seen from fig. 2, there is a strong and broad peak around 2θ=23°, indicating that the modified soybean straw biochar is amorphous, while there is a broad diffraction peak around 2θ=44°, indicating that the amorphous carbon with the turbine layer structure is formed;
FIG. 3 is a Fourier infrared spectrum of the modified soybean straw biochar prepared in example 1; as can be seen from FIG. 3, 3440cm -1 The broad peak at is represented by OOf 2920cm due to stretching vibrations of-H -1 The peak at is from-CH 3 and-CH 2 Is induced by stretching vibration of benzene ring and aromatic heterocycle at 1630cm -1 The stretching vibration of C=C and C=O produces a strong peak, which proves that the modified soybean straw biochar has strong aromatic property and is 1410cm in length -1 The peak intensity of-COOH at the position is enhanced, which indicates that the modification generates more oxygen-containing functional groups, thus being more beneficial to removing the chemical oxygen demand in the wastewater;
FIG. 4 is a graph of the kinetic adsorption of the modified soybean straw biochar prepared in example 1 to chemical oxygen demand in wastewater; according to the national standard of the people's republic of China, the method for measuring Chemical Oxygen Demand (COD) in industrial circulating cooling water, namely the permanganate index method, the chemical oxygen demand concentration in the wastewater is measured by a capacity method, and the formula is adopted
Calculate q e Wherein q is e C, for modifying the adsorption capacity of the soybean straw biochar to the chemical oxygen demand at different times 0 At the initial concentration of chemical oxygen demand, C e The equilibrium concentration of chemical oxygen demand is v is the volume of the sample solution, and m is the mass of the modified soybean straw biochar; at q e Drawing a kinetic adsorption curve on the ordinate and time on the abscissa, and plotting by Origin2018 software, wherein the result is shown in fig. 4; the absorption kinetics of the modified soybean straw biochar prepared by the invention to the chemical oxygen demand in the wastewater is faster, and the absorption balance can be achieved within 25min as can be known from fig. 4; />
FIG. 5 is a graph showing the chemical oxygen demand removal ability of the modified soybean straw biochar prepared in example 1 under different dosage conditions; according to the formula
R is calculated, R is taken as an ordinate, the addition amount is taken as an abscissa, and the drawing is carried out by Origin2018 drawing software, the result is shown in figure 5, the removal rate gradually increases with the increase of the addition amount, and when the addition amount is 3.33 g.L -1 At the time of removal rateThe balance is reached to 91%, which shows that the modified soybean straw biochar has remarkable effect of removing the chemical oxygen demand in the wastewater;
FIG. 6 is a graph of the recycling of the modified soybean straw biochar prepared in example 1 to the adsorption of chemical oxygen demand in wastewater; using 0.1 mol.L -1 The modified soybean straw biochar eluted and adsorbed by the hydrochloric acid solution is prepared according to the formula
Calculate E, where E is the removal rate, q n For the adsorption capacity of modified soybean straw biochar to chemical oxygen demand after n times of desorption/adsorption use, q 0 Is the total amount of chemical oxygen demand; drawing a cyclic utilization chart by using n as an abscissa and using the adsorption rate E as an ordinate, and performing chart drawing by using Origin2018 software, wherein the result is shown in FIG. 6; according to fig. 6, it can be known that the removal rate of the modified soybean straw biochar prepared by the invention is not obviously reduced after the adsorption of chemical oxygen demand in wastewater is subjected to desorption/adsorption for 5 times, and the removal rate is not lower than 85%.
Detailed Description
Example 1:
a method for removing chemical oxygen demand in wastewater by utilizing modified soybean straw biochar comprises the following steps: filtering the obtained wastewater to remove solid impurities, adding the modified soybean straw biochar into the wastewater to be treated, oscillating for 25min at an oscillating speed of 100rpm, and then filtering and separating to remove chemical oxygen demand in the wastewater to be treated, thereby obtaining the wastewater after treatment;
the preparation method of the modified soybean straw biochar is specifically completed according to the following steps:
1. preparing modified soybean straw: cutting soybean straw into small pieces, washing with distilled water to remove dust impurities, drying in a 50 ℃ oven for 24 hours, and crushing the dried soybean straw with a crusher; dissolving 5g of potassium carbonate in 50mL of distilled water, adding 5g of crushed soybean straw, uniformly stirring, and drying in an oven at 80 ℃ for 8 hours to obtain modified soybean straw;
2. preparing modified soybean straw biochar:putting the modified soybean straw prepared in the first step into a porcelain boat, then putting the porcelain boat into a tube furnace, heating at a pyrolysis temperature of 600 ℃ at a heating rate of 10 ℃/min for 2 hours and keeping the temperature constant for N 2 Pyrolysis is carried out under the condition of the flow rate of 45 mL/min; after the pyrolysis is finished and cooled, the synthesized black powder is washed with distilled water for 15min under the condition that the stirring speed is 200 rpm. After stirring is finished, standing, removing supernatant after solid precipitation, continuously adding distilled water, stirring and washing until the pH value of the solution is neutral, then carrying out suction filtration by using a circulating water type vacuum pump, and drying the suction-filtered modified soybean straw biochar in an oven at 50 ℃ for 4 hours to obtain the modified soybean straw biochar.
Claims (9)
1. A method for removing chemical oxygen demand in wastewater by utilizing modified soybean straw biochar comprises the following steps: filtering the obtained wastewater to remove solid impurities, adding the modified soybean straw biochar into the wastewater to be treated, oscillating for 10-60 min at an oscillating speed of 90-110 rpm, and then filtering and separating to remove chemical oxygen demand in the wastewater to be treated, thereby obtaining the wastewater after treatment;
the preparation method of the modified soybean straw biochar is specifically completed according to the following steps:
1. preparing modified soybean straw: cutting soybean straw into small blocks, washing with distilled water to remove dust impurities, drying in an oven at 45-55 ℃ for 23-25 h, and crushing the dried soybean straw with a crusher; dissolving potassium carbonate in distilled water, adding crushed soybean straw, uniformly stirring, and drying in an oven at 75-85 ℃ for 7-9 h to obtain modified soybean straw; the mass ratio of the potassium carbonate to the distilled water for dissolving the potassium carbonate in the first step is 1g: (10 mL-11 mL); the mass ratio of the potassium carbonate to the crushed soybean straw in the first step is 1g: (0.9 g-1.1 g);
2. preparing modified soybean straw biochar: putting the modified soybean straw prepared in the first step into a porcelain boat, then putting the porcelain boat into a tube furnace, and heating at the pyrolysis temperature of 550-650 DEG CThe speed is 9 ℃/min to 11 ℃/min, the constant temperature time is 1.5h to 2.5h, and N 2 Pyrolyzing at a flow rate of 40-50 mL/min; after pyrolysis is finished and cooled, the synthesized black powdery untreated modified soybean straw biochar is washed for 10 to 20 minutes by distilled water under the condition that the stirring speed is 190 to 210 rpm. After stirring is finished, standing, removing supernatant liquid after solid precipitation, continuously adding distilled water, stirring and washing until the pH value of the solution is neutral, then carrying out suction filtration by using a circulating water type vacuum pump, and drying the suction-filtered modified soybean straw biochar in an oven at 45-55 ℃ for 3-5 h to obtain the modified soybean straw biochar.
2. The method for removing chemical oxygen demand from wastewater by using modified soybean straw biochar according to claim 1, wherein the modified soybean straw biochar is added into the wastewater to be treated, and is filtered and separated after shaking for 25min at a shaking speed of 100 rpm.
3. The method for removing chemical oxygen demand from wastewater by using modified soybean straw biochar according to claim 1, wherein in the first step of the preparation method of the modified soybean straw biochar, soybean straw is cut into small pieces, dust impurities are removed by washing with distilled water, and the small pieces are dried in an oven at 50 ℃ for 24 hours.
4. The method for removing chemical oxygen demand in wastewater by utilizing modified soybean straw biochar according to claim 1, wherein in the first step of the preparation method of the modified soybean straw biochar, potassium carbonate is dissolved in distilled water, crushed soybean straw is added, and the mixture is stirred uniformly and dried in an oven at 80 ℃ for 8 hours to obtain the modified soybean straw.
5. The method for removing chemical oxygen demand from wastewater by using modified soybean straw biochar according to claim 1, wherein in the first step of the preparation method of the modified soybean straw biochar, potassium carbonate is dissolved in distilled water, and the volume ratio of the mass of the potassium carbonate to the distilled water in which the potassium carbonate is dissolved is 1g:10mL.
6. The method for removing chemical oxygen demand from wastewater by using modified soybean straw biochar according to claim 1, wherein in the first step of the preparation method of the modified soybean straw biochar, potassium carbonate is dissolved in distilled water, and crushed soybean straw is added, wherein the mass ratio of the potassium carbonate to the crushed soybean straw is 1g:1g.
7. The method for removing chemical oxygen demand from wastewater by using modified soybean straw biochar according to claim 1, wherein in the second step of the preparation method of the modified soybean straw biochar, the pyrolysis temperature is 600 ℃, the heating rate is 10 ℃/min, the constant temperature time is 2h, and the N is the same as the temperature of the modified soybean straw biochar 2 Pyrolysis was performed at a flow rate of 45 mL/min.
8. The method for removing chemical oxygen demand from wastewater by using modified soybean straw biochar according to claim 1, wherein in the second step of the preparation method of the modified soybean straw biochar, the synthesized black powder is washed with distilled water for 15min under the condition that the stirring rate is 200 rpm.
9. The method for removing chemical oxygen demand in wastewater by using modified soybean straw biochar according to claim 1, wherein in the second step of the preparation method of the modified soybean straw biochar, the modified soybean straw biochar after suction filtration is placed in a baking oven at 50 ℃ for drying for 4 hours, so as to obtain the modified soybean straw biochar.
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| US20220340462A1 (en) * | 2021-04-27 | 2022-10-27 | Nanjing University | Method of preparing carbonaceous material capable of fixing arsenic and application thereof |
| CN113731363A (en) * | 2021-09-16 | 2021-12-03 | 河北科技大学 | Adsorbent and preparation method and application thereof |
| CN114570330A (en) * | 2022-03-15 | 2022-06-03 | 福建稻田科技有限公司 | Biochar material and process for rapidly purifying livestock and poultry breeding wastewater by using biochar material |
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