CN113996270A - Preparation and application of modified medlar branch adsorbent - Google Patents
Preparation and application of modified medlar branch adsorbent Download PDFInfo
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—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
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3078—Thermal treatment, e.g. calcining or pyrolizing
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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
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- 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
- C02F2101/10—Inorganic compounds
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- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention discloses a preparation method of a modified medlar branch adsorbent, which comprises the steps of pretreatment, pyrolysis, modification and the like to obtain the modified medlar branch adsorbent. The method for preparing the adsorbent by utilizing the medlar branches has the characteristics of small dosage, low cost, good effect and the like, can produce laccase which is a product with high added value, and has the advantages of simple integral operation, low cost, environmental protection and environmental and economic benefits.
Description
Technical Field
The invention relates to a method for preparing an adsorbent by using agricultural wastes as main raw materials through different methods, and the adsorbent is applied to the treatment of environmental wastewater, including heavy metal wastewater and dye wastewater, and belongs to the technical field of waste resource utilization.
Background
China is a big industrial country, and the industrial system is improved year by year. In the production process of industries such as metallurgy, electroplating, printing and dyeing, pesticide, printing and dyeing, textile and the like, a large amount of industrial wastewater containing heavy metals and dyes is generated, and if the industrial wastewater is improperly treated, the industrial wastewater is discharged into the environment, so that the ecology is damaged and the human health is harmed. Meanwhile, China is also a big agricultural country, and has wide cultivated land and abundant crops. Wherein, the medlar is one of the important traditional Chinese medicinal materials in China due to the rich functional components such as polysaccharide, flavonoid, carotenoid and the like, and is also an important economic crop in northwest of China, the annual planting area reaches 82000 hectares, and the annual yield of berries is 95000 tons. The medlar is a shrub with white leaves, the medlar needs to be trimmed regularly in the growing process, and the annual output of the waste medlar branches reaches 20 ten thousand tons according to actual calculation. The application of the waste medlar branches is only limited to seedling transplanting, and most of the medlar branches are incinerated and piled up to cause resource waste and environmental pollution.
In order to realize resource utilization of agricultural wastes and use the agricultural wastes for treating heavy metal wastewater, the Chinese patent with the application number of CN200610146145.8 discloses a method for producing laccase by solid-state fermentation of trametes AH28-2, which is to inoculate strain liquid of trametes AH28-2 on a sterilized solid culture medium and perform fermentation culture for 20-30 days at the temperature of 20-28 ℃. The solid culture medium consists of 3-5 parts of oil crop straws, 1-3 parts of grain bran, 1-2 parts of peanut shell powder and 2-6 times of water by mass, and has natural pH. After the fermentation is finished, adding water for extraction, and obtaining the blocky laccase through precipitation, impurity removal, ultrafiltration concentration and freeze drying, wherein the enzyme activity is 8000U/g.
Chinese patent application No. CN201510555315.7 discloses a method for removing chromium in water by using biochar prepared from corn stalks2The high-temperature pyrolysis is carried out to form the biochar under the environment, the chromium in the water body is effectively removed, the jade straw biochar after adsorbing the chromium is relatively stable, the adsorbed chromium cannot be easily desorbed and enters the water body again for productionThe cost is low, and the resource utilization maximization of the agricultural straws can be realized.
The existing methods for treating wastewater containing heavy metal ions mainly comprise a chemical precipitation method, a membrane filtration method, an ion exchange method, an evaporation recovery method, an adsorption method, an electrolysis method and the like, but are limited due to the reasons of high operation cost and raw material cost, complex process, easy generation of secondary pollution and the like. For dye wastewater with deep chromaticity and difficult degradation, the price of common adsorbing materials is higher. In the implementation and application of taking a plurality of modified straws as the adsorbent, common crop straws such as rice, corn, soybean, wheat and the like are mostly concentrated, but resource utilization of shrub crops such as medlar branches is rarely reported.
Aiming at the technical problems, the invention has environmental benefit for developing the medlar branches into the adsorbent and removing the heavy metals and the dyes in the water, and provides a theoretical basis for further developing the utilization value of the shrub-type wastes of the medlar branches.
Disclosure of Invention
Aiming at the defects of the technology for treating wastewater containing heavy metals or dyes in the prior art, the invention provides a method for preparing various adsorbents by utilizing medlar branches through the technical means of fungus solid state fermentation, oxygen-limited high-temperature pyrolysis and alkali activation and removing chromium, cadmium, copper and methylene blue in water. The invention realizes the effective removal of heavy metals and dyes in water and the resource utilization of the waste medlar branches.
Specifically, the invention adopts the following technical scheme:
a preparation method of a modified medlar branch adsorbent comprises the following steps:
1) pretreatment: drying and crushing medlar branches, sieving and drying;
2) pyrolysis: pyrolyzing the crushed medlar branches in an inert atmosphere, then pickling with hydrochloric acid to obtain charcoal, and drying;
3) modification: modifying the dried charcoal in sodium hydroxide solution to obtain modified fructus Lycii branch adsorbent,
wherein the pyrolysis conditions are in N2Pyrolyzing for 2 hours at 700 ℃ in the environment at the heating rate of 10 ℃/min; the acid washing condition is that 0.1MHCl solution is used for washing surface impurities and then deionized water is used for washing the surface impurities to be neutral; the modification condition is that the biochar after acid washing is carried out in 2molL-1Soaking in sodium hydroxide solution in water bath at 80 deg.c for 6 hr, filtering the mixture, washing with deionized water to neutrality, and stoving at 80 deg.c.
Preferably, before pyrolysis, the method further comprises a step of fermenting the medlar branches, wherein the crushed medlar branches are sterilized, then the sterilized medlar branches are used as a solid fermentation culture substrate, oyster mushroom strains are inoculated, and the cultivation is carried out for 7 days under the conditions of light shielding and constant temperature of 30 ℃.
The invention also discloses application of the prepared modified medlar branch adsorbent, wherein the modified medlar branch adsorbent is prepared by adopting the preparation method, and the application comprises the steps of mixing the modified medlar branch adsorbent with wastewater to remove pollutants in the water.
In the above application, the wastewater is a heavy metal wastewater or a wastewater containing a dye.
In one aspect, the heavy metal wastewater is a wastewater containing Cr3+、Cd2+、Cu2+The wastewater of (2). When the modified medlar branch adsorbent prepared by the method is applied, the treatment conditions are as follows: the heavy metal content in the wastewater is 2-36 mg/L, and the addition amount of the modified medlar branch adsorbent is 0.02g per 10ml of heavy metal solution.
In another aspect the waste water containing the dye is an aqueous dye solution, said dye being methylene blue. Wherein the adsorption conditions are as follows: the pH value is 3-10, the adding amount of the modified medlar branch adsorbent is 0.5-4g/L, the temperature is 15-55 ℃, the concentration of dye wastewater is 5-200mg/L, the reaction time is 0-240min, and the oscillation reaction is carried out in a constant temperature shaking table oscillator at 160 rpm/min.
The invention discloses a preparation method of a modified medlar branch adsorbent, which comprises the steps of pretreatment, pyrolysis, modification and the like to obtain the modified medlar branch adsorbent. The method for preparing the adsorbent by utilizing the medlar branches has the characteristics of small dosage, low cost, good effect and the like, can produce laccase which is a product with high added value, and has the advantages of simple integral operation, low cost, environmental protection and environmental and economic benefits.
Drawings
FIG. 1 is a preparation route of a medlar branch-based adsorbent and adsorption of Cr3+、Cd2+、Cu2+And a methylene blue effect diagram.
Detailed Description
The invention belongs to the technical field of waste resource utilization, and particularly relates to a method for treating waste medlar branches by utilizing fungus solid state fermentation, high temperature pyrolysis and alkali modification and applying the branches to treatment of heavy metal wastewater and dye wastewater. Aiming at the defects of the existing treatment mode of the medlar branches, the invention aims to provide a method for removing chromium, cadmium, copper and methylene blue in water by using an adsorbent prepared from waste medlar branches. The adsorbent prepared by the method can effectively remove heavy metals and dyes, and the method can produce laccase which is a product with high added value, thereby realizing the maximization of the utilization of agricultural straw resources and reducing the production cost.
Aiming at the problem of heavy metal pollution, different physical and chemical methods such as adsorption, chemical precipitation, ion exchange, electrochemical treatment, membrane filtration and the like are adopted to reduce the heavy metal pollution. The adsorption method is considered to be one of the most effective methods for removing heavy metals in water due to its simple operation, wide material sources and economy, and the adsorption method can also effectively treat dye wastewater. Therefore, the medlar branch is adopted to prepare the adsorbing material, which is not only beneficial to the reduction and the resource utilization of agricultural wastes, but also can reduce the cost of the adsorbing material, and has very important significance for the treatment of water environment pollution.
In order to achieve the purpose, the invention provides the following technical ideas: taking part of the waste medlar branches as an adsorbent and naming the part as LB; it is prepared into adsorbent by solid state fermentation technology and named FLB. LB and FLB are pyrolyzed respectively by utilizing an oxygen-limited high-temperature pyrolysis technology to prepare adsorbents which are named as LBB and FLBB respectively. LBB and FLBB were activated with NaOH, prepared as adsorbents and named ALBB and AFLBB.
The heavy metal wastewater in the invention is selected from Cr3+、Cd2+、Cu2+(ii) a The dye wastewater is selected from methylene blue.
The invention provides a method for removing chromium, cadmium, copper and methylene blue in a water body by using an adsorbent prepared from medlar branches.
In one representative embodiment, the method of the present invention comprises the steps of:
1) the medlar branches are purchased from a certain plant farm in Ningxia, naturally dried and crushed, then sieved by a 80-mesh sieve, dried at 80 ℃, and part of the medlar branches act on an adsorbent (LB);
2) taking one part of the mixture according to a solid-liquid ratio of 1: 4, adding deionized water, and preserving the heat for 20 minutes at the temperature of 121 ℃ and under the pressure of 0.12MPa to obtain the sterilized medlar branches. Taking the sterilized medlar branches as a solid fermentation culture substrate, inoculating oyster mushroom strains cultured on a PDA (personal digital Assistant) plate for seven days on a medlar branch medium culture medium, and culturing for 7 days under the conditions of light shielding and constant temperature of 30 ℃. Soaking the fermented branches of the Chinese wolfberry with deionized water, shaking for 4 hours in a gas bath shaking table, and drying the filtered branches at 80 ℃ to prepare an adsorbent (FLB);
3) the Chinese wolfberry branches before and after fermentation are in N2In the environment, the temperature is raised at the speed of 10 ℃/min, pyrolysis is carried out for 2 hours at the temperature of 700 ℃, surface impurities are washed by 0.1MHCl solution and then washed by deionized water to be neutral, and the obtained charcoal samples (LBB and FLBB) are dried at the temperature of 80 ℃;
4) 6g of each of biochar LBB and FLBB was immersed in 100mL of 2molL-1Soaking in sodium hydroxide solution in water bath at 80 deg.C for 6 hr, filtering the mixture, washing with deionized water to neutrality (about 6.8), and oven drying at 80 deg.C, wherein the NaOH modified biochar is named as ALBB and AFLBB;
5) the adsorbent is used for removing chromium, cadmium, copper and methylene blue in a water body, and the operation steps are as follows:
(5-1) adsorbent prepared from medlar branches and Cr-containing adsorbent3+、Cd2+、Cu2+Mixing the solution at a solid-to-liquid ratio of 1:500 (0.02 g of medlar branch-based adsorbent is added to each 10ml of heavy metal-containing solution), adjusting pH to 2-6 with 0.1mol/L hydrochloric acid and sodium hydroxide, carrying out oscillation reaction for 12h at the temperature of 25-45 ℃ in a constant temperature shaking table oscillator at 160rpm/min, and extracting supernatant;
(5-2) collecting the solution after the reaction at set time intervals, rapidly filtering the solution through a 0.45 mu m filter, and measuring the concentration of the heavy metal in the filtrate by adopting ICP (inductively coupled plasma);
(5-3) mixing an adsorbent prepared from medlar branches with a methylene blue-containing solution, and under the conditions of different pH (3-10), addition amount (0.5-4g/L), temperature (15-55 ℃), dye wastewater concentration (5-200mg/L) and reaction time (0-240min), carrying out oscillation reaction in a constant temperature shaking table oscillator at 160rpm/min, and extracting supernatant;
(5-4) collecting the reacted supernatant under the set conditions, measuring the light absorption value at 664nm, and calculating the dye concentration in the filtrate.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments.
The first embodiment is as follows:
(1) mixing the prepared medlar branch-based biochar with 2-36 mg/L of trivalent chromium solution in a solid-to-liquid ratio of 1:500 (0.02 g of adsorbent carbon is added to each 10ml of trivalent chromium solution), adjusting the pH value to 3-7 by using 0.05mol/L hydrochloric acid and sodium hydroxide, and carrying out oscillation reaction at the temperature of 25-45 ℃ and at the rpm of 160/min for 72 hours;
(2) after the reaction is finished, filtering the supernatant by using a 0.45um acetate fiber filter membrane;
(3) and measuring the trivalent chromium concentration in the filtrate by adopting ICP-Max, wherein the measurement results are respectively as follows:
LB (medlar branch) to Cr3+The maximum adsorption capacity is 5.67mg/g,
FLB (fermented medlar branch) to Cr3+The maximum adsorption capacity is 6.29mg/g,
LBB (medlar branch biochar) to Cr3+The maximum adsorption capacity is 2.52mg/g,
FLBB (fermented medlar branch biochar) pair Cr3+The maximum adsorption capacity is 3.21mg/g,
ALBB (alkali-activated medlar branch biochar) on Cr3+The maximum adsorption capacity is 5.08mg/g,
AFLBB (alkali activated fermentation medlar branch biochar) on Cr3+The maximum adsorption capacity was 5.56 mg/g.
Example two:
the difference between this embodiment and the first embodiment is that the conditions are not changed when the trivalent chromium is replaced by the divalent cadmium in the above embodiments, which are specifically as follows:
(1) mixing the prepared medlar branch-based biochar with 2-36 mg/L of a divalent cadmium solution at a solid-to-liquid ratio of 1:500 (0.02 g of adsorbent carbon is added to each 10ml of the divalent cadmium solution), adjusting the pH value to 3-7 by using 0.05mol/L hydrochloric acid and sodium hydroxide, and carrying out oscillation reaction at 160rpm/min for 72 hours at the temperature of 25-45 ℃;
(2) after the reaction is finished, filtering the supernatant by using a 0.45um acetate fiber filter membrane;
(3) and (3) measuring the concentration of the divalent cadmium in the filtrate by adopting ICP-Max, wherein the measurement results are respectively as follows:
LB (medlar branch) pair Cd2+The maximum adsorption capacity is 11.53mg/g,
FLB (fermented medlar branch) pair Cd2+The maximum adsorption capacity is 7.77mg/g,
LBB (Chinese wolfberry branch charcoal) to Cd2+The maximum adsorption capacity is 3.05mg/g,
FLBB (fermented medlar branch biochar) pair Cd2+The maximum adsorption capacity is 2.72mg/g,
ALBB (alkali-activated medlar branch biochar) pair Cd2+The maximum adsorption capacity is 3.52mg/g,
AFLBB (alkali activated fermentation medlar branch biochar) pair Cd2+The maximum adsorption capacity was 3.73 mg/g.
Example three:
the difference between this embodiment and the first embodiment is that trivalent chromium in the above embodiment is replaced by divalent copper, and other conditions are not changed, specifically as follows:
(1) mixing the prepared medlar branch-based biochar with 2-36 mg/L of a divalent copper solution at a solid-to-liquid ratio of 1:500 (0.02 g of adsorbent carbon is added to each 10ml of divalent copper solution), adjusting the pH value to 3-7 by using 0.05mol/L hydrochloric acid and sodium hydroxide, and carrying out oscillation reaction at 160rpm/min for 72 hours at the temperature of 25-45 ℃;
(2) after the reaction is finished, filtering the supernatant by using a 0.45um acetate fiber filter membrane;
(3) and (3) measuring the concentration of the divalent copper in the filtrate by adopting ICP-Max, wherein the measurement results are respectively as follows:
LB (medlar branch) to Cu2+The maximum adsorption capacity is 7.27mg/g,
FLB (fermented medlar branch) to Cu2+The maximum adsorption capacity is 5.93mg/g,
LBB (medlar branch biochar) to Cu2+The maximum adsorption capacity is 3.25mg/g,
FLBB (fermented medlar branch biochar) for Cu2+The maximum adsorption capacity is 3.25mg/g,
ALBB (alkali activated medlar branch biochar) on Cu2+The maximum adsorption capacity is 3.71mg/g,
AFLBB (alkali activated fermentation medlar branch biochar) on Cu2+The maximum adsorption capacity was 4.01 mg/g.
Example four:
(1) mixing an adsorbent prepared from medlar branches with a solution containing methylene blue, and oscillating and reacting at 160rpm/min in a constant temperature shaking table oscillator under the conditions of different pH (3-10), addition amount (0.5-4g/L), temperature (15-55 ℃), dye wastewater concentration (5-200mg/L) and reaction time (0-240 min);
(2) after the reaction is finished, centrifuging for 3min at the rotating speed of 4000rpm/min by using a centrifuge, and extracting supernatant;
(3) measuring the light absorption value at 664nm by using an ultraviolet-visible spectrophotometer, wherein the measurement results are respectively as follows:
the maximum adsorption capacity of LB (medlar branch) to methylene blue is 57.14mg/g,
the maximum adsorption quantity of FLB (fermented medlar branches) to methylene blue is 39.06mg/g,
the maximum adsorption capacity of LB (medlar branch biochar) to methylene blue is 9.37mg/g,
the maximum adsorption capacity of FLBB (fermented medlar branch biochar) to methylene blue is 9.45mg/g,
the maximum adsorption quantity of ALBB (alkali activated medlar branch biochar) to methylene blue is 11.40mg/g,
the maximum adsorption capacity of AFLBB (alkali activated fermentation medlar branch biochar) on methylene blue is 11.68 mg/g.
Example five:
(1) crushing the medlar branches, sieving the crushed medlar branches with a 80-mesh sieve, drying the medlar branches at 80 ℃, and taking a part of the medlar branches according to a solid-to-liquid ratio of 1: 4 adding deionized water, keeping the temperature at 121 ℃ and 0.12MPa for 20 minutes, and using the sterilized medlar branches as a solid fermentation culture substrate. Inoculating oyster mushroom strains cultured on a PDA (personal digital Assistant) plate for seven days on a medlar branch medium, and culturing for 7 days under the conditions of light protection and constant temperature of 30 ℃. Soaking the fermented medlar branches in deionized water, shaking for 4 hours in a gas bath shaking table, filtering out filter residues, and measuring the enzyme activity of the filtrate;
(2) the enzyme activity of the filtrate is determined by taking a phenolic compound DMP as a substrate, the reaction system is 3mL, the reaction system comprises 2.4mL of 0.1mol/L phosphate buffer solution (pH is 3.5), 0.5mL of 10mmol/L DMP solution and 0.1mL of filtrate, and the absorbance of the mixed solution is measured at 470 nm. 1 enzyme activity unit is defined as the amount of enzyme required to produce 1. mu. mol of product per minute, and the enzyme activity of the filtrate was measured to be 8.7U/g.
In the embodiment, the method can be seen that the development of the medlar branches into the adsorbent for removing heavy metals in water is feasible, and the laccase, which is a high value-added product, can be produced, so that the method has good environmental and economic benefits.
While the embodiments of the present invention have been described in detail with reference to the drawings and the specific examples, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (9)
1. A preparation method of a modified medlar branch adsorbent is characterized by comprising the following steps:
1) pretreatment: drying and crushing medlar branches, sieving and drying;
2) pyrolysis: pyrolyzing the crushed medlar branches in an inert atmosphere, then pickling with hydrochloric acid to obtain charcoal, and drying;
3) modification: modifying the dried charcoal in sodium hydroxide solution to obtain modified fructus Lycii branch adsorbent,
wherein the pyrolysis conditions are in N2Pyrolyzing for 2 hours at 700 ℃ in the environment at the heating rate of 10 ℃/min; the acid washing condition is that 0.1MHCl solution is used for washing surface impurities and then deionized water is used for washing the surface impurities to be neutral; the modification condition is that the biochar after acid washing is carried out in 2molL-1Soaking in sodium hydroxide solution in water bath at 80 deg.c for 6 hr, filtering the mixture, washing with deionized water to neutrality, and stoving at 80 deg.c.
2. The method for preparing the modified medlar branch adsorbent according to claim 1, further comprising a step of fermenting medlar branches before pyrolysis, wherein the crushed medlar branches are sterilized, and then the sterilized medlar branches are used as a solid state fermentation culture substrate, inoculated with oyster mushroom strains and cultured for 7 days under the conditions of light shielding and constant temperature of 30 ℃.
3. Use of a modified lycium barbarum shoot adsorbent made by the method of claim 1 or 2 for the preparation of a modified lycium barbarum shoot adsorbent for removing contaminants from water by mixing the modified lycium barbarum shoot adsorbent with waste water.
4. The use of the modified lycium barbarum shoot adsorbent of claim 3, wherein the wastewater is heavy metal wastewater.
5. The use of the modified lycium barbarum shoot adsorbent of claim 4, wherein the heavy metal wastewater is comprised of Cr3+、Cd2+、Cu2+The wastewater of (2).
6. The application of the modified medlar branch adsorbent according to claim 5, wherein the content of heavy metal in the wastewater is 2-36 mg/L, and the addition amount of the modified medlar branch adsorbent is 0.02g per 10ml of heavy metal solution.
7. The use of the modified lycium barbarum shoot adsorbent of claim 3, wherein the wastewater is a dye-containing wastewater.
8. The use of a modified lycium barbarum shoot sorbent according to claim 7, wherein the dye is methylene blue.
9. The use of a modified lycium barbarum shoot adsorbent according to claim 8, wherein the adsorption conditions are: the pH value is 3-10, the adding amount of the modified medlar branch adsorbent is 0.5-4g/L, the temperature is 15-55 ℃, the concentration of dye wastewater is 5-200mg/L, the reaction time is 0-240min, and the oscillation reaction is carried out in a constant temperature shaking table oscillator at 160 rpm/min.
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