CN110665469A - Modified composite adsorbent and preparation method and application thereof - Google Patents
Modified composite adsorbent and preparation method and application thereof Download PDFInfo
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- CN110665469A CN110665469A CN201910888403.7A CN201910888403A CN110665469A CN 110665469 A CN110665469 A CN 110665469A CN 201910888403 A CN201910888403 A CN 201910888403A CN 110665469 A CN110665469 A CN 110665469A
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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
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
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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
- B01J20/02—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
- B01J20/08—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 comprising aluminium oxide or hydroxide; comprising bauxite
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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
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
- B01J20/28011—Other properties, e.g. density, crush strength
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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
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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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
- C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
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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
- C02F2101/308—Dyes; Colorants; Fluorescent agents
Abstract
The invention belongs to the field of water treatment, and discloses a modified composite adsorbent and a preparation method and application thereof. Adding an aqueous solution of aluminum salt into an alkali solution under stirring until the pH value of the solution is 6.5-7.5, sealing and heating the obtained suspension, filtering and washing, drying and heating to obtain aluminum oxide; adding alumina into acetic acid solution of chitosan, adding glutaraldehyde to form colloid, drying, grinding, washing, drying, adding the obtained chitosan composite alumina into deionized water, adding cationic surfactant, stirring, filtering, washing with ethanol and deionized water, and drying. The modified composite adsorbent has the advantages of simple preparation method, strong adsorption capacity, high adsorption efficiency on ionic dyes, easy separation from reaction solution, no secondary pollution to the environment and the like, can effectively adsorb the ionic dyes in the printing and dyeing wastewater, and is suitable for treating the printing and dyeing wastewater containing the ionic dyes.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a modified composite adsorbent and a preparation method and application thereof.
Background
Modern industries require large amounts of chemical raw materials to support their daily production, where ionic dyes are very important and indispensable, especially in the fields of paper making, textile and food processing. However, due to the characteristics of non-degradability, bioaccumulation, toxicity and carcinogenicity of the ionic dyes, the ionic dyes are discharged into the environment without proper treatment, and pose a great threat to the safety of the water body ecosystem and the health of human bodies.
The conventional adsorbing material is difficult to effectively adsorb sewage containing a plurality of dyes and separate a certain type of dye in the mixed dyes. Therefore, there is a need for an adsorbent material that can be used in a mixed dye system and that can selectively adsorb contaminants in a controlled manner. The chitosan is an environment-friendly organic dye adsorbent, and the contained amino and hydroxyl functional groups have good adsorbability on dye molecules, but are easy to dissolve under acidic conditions due to the protonation effect of the amino. Alumina is a traditional inorganic industrial material, is usually used as an absorbent and a catalyst, has large specific surface area, high stability and pore volume, but lacks an adsorption group.
When glutaraldehyde modified chitosan is loaded on alumina, the defect that chitosan is easy to dissolve under an acidic condition can be overcome to a great extent, and meanwhile, the adsorption groups of alumina are increased, so that the synthesized composite material has the advantages of high adsorption capacity and strong stability. The adsorption material can have the capacity of selectively adsorbing pollutants by adopting proper surfactant modification aiming at different types of dyes. In order to solve the problems of effectively treating mixed dyes and separating different dyes, a novel composite material modified by a cationic surfactant is prepared, and ionic dyes can be effectively treated by constructing a multilayer structure, so that the mixed dyes can be effectively treated, and different types of dyes can be separated.
Disclosure of Invention
In order to solve the defects in the prior art, the invention mainly aims to provide a modified composite adsorbent. The adsorbent has a large number of adsorption groups with positive charges on the surface and a large specific surface area, can effectively adsorb ionic dyes, has high efficiency of adsorbing and treating the ionic dyes, strengthens the adsorption capacity of the adsorbent on the ionic dyes, and can be applied to treating mixed dye systems and separating anionic/cationic dyes.
The invention also aims to provide a preparation method of the modified composite adsorbent. The method has low cost and simple preparation, and the chitosan is covered on the surface of the alumina by a crosslinking method, so that the modified composite adsorbent combines the characteristics of the alumina and the chitosan, a large number of adsorption groups and a huge specific surface area, can effectively adsorb ionic dye, and overcomes the defect that the chitosan is easy to dissolve under an acidic condition. And then the positive charges on the surface of the modified composite adsorbent are increased and nitrogen atoms are introduced through the modification of the positive surfactant, so that the adsorption capacity of the modified composite adsorbent on the ionic dye is enhanced.
The invention also aims to provide application of the modified composite adsorbent.
The purpose of the invention is realized by the following technical scheme:
a modified composite adsorbent is prepared by completely dissolving aluminum salt in deionized water, adding an alkali solution while stirring until the pH value of the solution is 6.5-7.5, sealing the obtained suspension, heating at 60-120 ℃, filtering, washing, drying, grinding, and heating at 40-80 ℃ to obtain aluminum oxide; adding alumina into acetic acid solution of chitosan, stirring at 40-90 ℃, adding glutaraldehyde to form colloid, drying, grinding, washing, and drying to obtain chitosan composite alumina; adding chitosan composite alumina into deionized water, adding a cationic surfactant, stirring, filtering, washing with ethanol and deionized water, and drying to obtain the chitosan composite alumina.
Preferably, the volume ratio of the mass of the aluminum salt to the deionized water is (3-8) g: (20-60) ml; the aluminum salt is aluminum sulfate octadecahydrate or/and aluminum chloride.
Preferably, the alkali solution is sodium hydroxide solution, potassium hydroxide or ammonia water; the concentration of the alkali solution is 0.2-5 mol/L.
Preferably, the cationic surfactant is an alkyl quaternary ammonium salt or a heterocyclic quaternary ammonium salt.
More preferably, the alkyl quaternary ammonium salt is cetyl trimethyl ammonium bromide or dimethyl cetyl allyl ammonium chloride, and the heterocyclic quaternary ammonium salt is dodecyl pyridine ammonium chloride quaternary ammonium salt or dodecyl quinoline bromide.
Preferably, the ratio of the mass of the alumina to the mass of the chitosan to the volume of the acetic acid to the volume of the glutaraldehyde is (0.05-0.5) g: (0.04-0.4) g: (20-50) ml: (0.5-0.25) ml, wherein the concentration of the acetic acid is 1-15 vol%; the volume ratio of the mass of the chitosan composite alumina to the mass of the cationic surfactant to the volume of the deionized water is (0.05-0.5) g: (0.01-0.1) g: (20-50) ml.
Preferably, the drying temperature is 40-90 ℃, and the drying time is 1-20 h.
The preparation method of the modified composite adsorbent comprises the following specific steps:
s1, completely dissolving aluminum salt in water, adding an alkali solution while stirring until the pH value of the solution is 6.5-7.5, sealing the obtained suspension, heating at 60-120 ℃ for 6-24 h, filtering, washing, drying, grinding and heating to obtain aluminum oxide;
s2, adding alumina into an acetic acid solution of chitosan, stirring at 40-90 ℃ to obtain a solution A, stirring at 40-90 ℃, adding glutaraldehyde to form a colloid, drying, grinding the dried solid, washing with deionized water and ethanol, and drying to obtain chitosan composite alumina;
and S3, adding the chitosan composite alumina into deionized water, adding a cationic surfactant, stirring for 0.5-5 h, filtering, washing with ethanol and deionized water, and drying to obtain the cationic surfactant modified chitosan coated alumina composite adsorbent.
Preferably, the detergents in steps S1, S2 and S3 are ethanol and deionized water.
The modified composite adsorbent is applied to the field of adsorption of dyes in printing and dyeing wastewater, wherein the dyes are anionic dyes or/and amino-containing cationic dyes.
Compared with the prior art, the invention has the following beneficial effects:
1. the modified composite adsorbent has higher efficiency of treating the ionic dye, and compared with the adsorbent before modification and compounding, the modified composite adsorbent has the advantages that the surface of the modified composite adsorbent is positively charged, so that all anionic dye can be adsorbed by electrostatic attraction, and for cationic dye with amino, adsorption can be carried out by forming hydrogen bonds, so that the adsorption capacity is enhanced. The method mainly shows that adsorption sites of the original adsorbent are enriched and increased, the charge strength of the surface of the adsorbent is increased, the electrostatic attraction and the acting force of hydrogen bonds between the adsorbent and ionic dyes are enhanced through modification of the composite chitosan and the alumina and the impregnated cationic surfactant, so that the adsorbent can efficiently adsorb the ionic dyes, and the adsorbent can adsorb the ionic dyes through the electrostatic attraction and the hydrogen bond.
2. The modified composite adsorbent prepared by the invention is simple to prepare, easy to separate from a reaction solution, high in treatment efficiency, low in production cost and free of secondary pollution to the environment. Can effectively adsorb the ionic dye in the printing and dyeing wastewater and is suitable for treating the printing and dyeing wastewater containing the ionic dye.
3. The invention prepares the modified composite adsorbent of chitosan @ alumina modified by the cationic surfactant with a multilayer structure by a crosslinking method and an impregnation method, and the modified composite adsorbent has high efficiency of adsorbing and treating ionic dyes. The modified composite material has strong adsorption capacity to ionic dyes, adsorbs anionic dyes through electrostatic action and hydrogen bond action, and adsorbs cationic dyes with amino groups through hydrogen bond action.
4. According to the invention, the surface charge of the modified composite adsorbent can be changed by adjusting the pH value, so that the anionic dye in an anionic/cationic dye mixed system can be selectively adsorbed.
Drawings
FIG. 1 is a scheme showing the synthesis of a modified composite adsorbent according to the present invention.
FIG. 2 is a graph showing the effect of adsorption time on treatment of an ionic dye with a modified composite adsorbent in application example 1.
FIG. 3 is a graph of the effect of applying the pH of example 2 to the treatment of ionic dyes with a modified composite adsorbent.
FIG. 4 is an adsorption spectrum of the adsorption process of the composite adsorbent modified under different pH values in application example 3 in an anionic/cationic dye mixed system.
Detailed Description
The following examples are presented to further illustrate the present invention and should not be construed as limiting the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
Example 1
1. Adding 6.18g of aluminum sulfate octadecahydrate into 30ml of deionized water, fully dissolving, adding 1mol/L of sodium hydroxide solution to adjust the pH of the solution to 7 under magnetic stirring, curing for 18 hours at 105 ℃ under a sealed condition, filtering, washing twice by using 15ml of ethanol, washing by using 15ml of deionized water, drying for 5 hours in a 60 ℃ drying oven to obtain aluminum hydroxide solid, and heating the aluminum hydroxide solid for 3 hours at 500 ℃ by using a muffle furnace to obtain aluminum oxide;
2. dissolving 0.2g of chitosan in 30ml of acetic acid solution (1%), adding 0.2g of alumina, adjusting the temperature of the solution to 60 ℃ under magnetic stirring, adding 1.5ml of glutaraldehyde (25%), generating yellow colloid, drying for 14 hours in an oven at 60 ℃, washing with 15ml of ethanol and deionized water respectively after grinding, and drying for 1 hour in the oven at 60 ℃ to prepare the chitosan composite alumina adsorbent;
3. dissolving 0.06g of hexadecyl trimethyl ammonium bromide in 30ml of deionized water, adding 0.2g of chitosan composite alumina adsorbent, magnetically stirring for 3 hours, washing twice with 10ml of alcohol, then washing with 20ml of deionized water, and drying in an oven at 60 ℃ for 1 hour to obtain the hexadecyl trimethyl ammonium bromide modified chitosan coated alumina modified composite adsorbent.
FIG. 1 is a scheme showing the synthesis of a modified composite adsorbent according to the present invention. Firstly, synthesizing active alumina, then coating chitosan on the surface of the alumina by using a cross-linking agent glutaraldehyde, and then modifying the chitosan coated on the surface of the alumina by using a cationic surfactant through an impregnation method.
Example 2
1. Adding 8g of aluminum chloride into 60ml of deionized water, fully dissolving, adding 5mol/L sodium hydroxide solution under magnetic stirring to adjust the pH of the solution to 7.5, curing for 6 hours at 60 ℃ under a sealed condition, filtering, washing twice with 15ml of ethanol, washing with 15ml of deionized water, drying in an oven at 80 ℃ for 9 hours to obtain aluminum hydroxide solid, and heating the aluminum hydroxide solid in a muffle furnace at 500 ℃ for 3 hours to obtain aluminum oxide;
2. dissolving 0.5g of chitosan in 50ml of acetic acid solution (5%), adding 0.2g of alumina, adjusting the temperature of the solution to 40 ℃ under magnetic stirring, adding 2.5ml of glutaraldehyde (25%), generating yellow colloid, drying in an oven at 90 ℃ for 18 hours, washing with 15ml of ethanol and deionized water respectively after grinding, and drying in the oven at 90 ℃ for 3 hours to prepare the chitosan composite alumina adsorbent;
3. dissolving 0.1g of hexadecyl trimethyl ammonium bromide in 50ml of deionized water, adding 0.2g of chitosan composite alumina adsorbent, magnetically stirring for 0.5 hour, washing twice with 15ml of alcohol, then washing with 20ml of deionized water, and drying in an oven at 90 ℃ for 10 hours to obtain the hexadecyl trimethyl ammonium bromide modified chitosan coated alumina modified composite adsorbent.
Example 3
1. Adding 3g of aluminum sulfate into 20ml of deionized water, fully dissolving, adding 0.2mol/L of sodium hydroxide solution under magnetic stirring to adjust the pH value of the solution to 6.5, curing for 24 hours at 120 ℃ under a sealed condition, filtering, washing twice by using 2ml of ethanol, washing by using 2ml of deionized water, drying in a 40 ℃ oven for 18 hours to obtain aluminum hydroxide solid, and heating the aluminum hydroxide solid for 3 hours at 500 ℃ by using a muffle furnace to obtain aluminum oxide;
2. dissolving 0.05g of chitosan in 20ml of acetic acid solution (15%), adding 0.05g of alumina, adjusting the temperature of the solution to 90 ℃ under magnetic stirring, adding 0.5ml of glutaraldehyde (25%), generating yellow colloid, drying for 15 hours in an oven at 40 ℃, washing with 15ml of ethanol and deionized water respectively after grinding, and drying for 1 hour in the oven at 90 ℃ to prepare the chitosan composite alumina adsorbent;
3. dissolving 0.01g of dimethylhexadecyl allyl ammonium chloride in 20ml of deionized water, adding 0.05g of chitosan composite alumina adsorbent, magnetically stirring for 5 hours, washing twice with 2ml of alcohol, then washing with 2ml of deionized water, and drying in an oven at 40 ℃ for 3 hours to obtain the modified composite adsorbent of the dimethylhexadecyl allyl ammonium chloride modified chitosan coated alumina.
Application example 1
The experimental conditions were: adjusting the pH value to 6, adding 30mg of the modified composite adsorbent obtained in example 1 into a beaker after adding anionic dye (methyl orange, Congo red and active blue) solution with the volume of 100ml and the concentration of 70mg/L respectively, shaking the beaker in a constant temperature shaking table at 25 ℃, taking supernatant liquid at intervals to measure the concentration of the solution, and reacting until the adsorption reaches the balance. FIG. 2 is a graph showing the effect of adsorption time on the modified composite adsorbent treatment of anionic dyes. As shown in FIG. 2, the adsorption amounts of the modified composite adsorbent to methyl orange, Congo red and active blue solutions in 1 hour are 197mg/g, 367mg/g and 338mg/g respectively, which shows that the modified composite adsorbent has a large adsorption amount to anionic dyes and can reach a large adsorption amount in a short time. The adsorption of methyl orange reaches equilibrium in 480 minutes, the equilibrium adsorption capacity is 260mg/g, while the adsorption of active blue and Congo red has longer equilibrium time, and reaches saturation in 180 hours and 300 hours, respectively, and the saturation adsorption capacity is 740mg/g and 1180 mg/g. The modified composite adsorbent has relatively short adsorption equilibrium time and relatively low adsorption capacity to the anionic dye methyl orange without amino; the adsorption equilibrium time for the anionic dye congo red containing amino and the active blue is relatively short, and the adsorption quantity is relatively low.
Application example 2
The experimental conditions were: a solution of anionic dyes (methyl orange, congo red, reactive blue) in a volume of 100ml and a concentration of 70mg/L, each dye being adjusted to a pH of from 4 to 9, respectively. 30mg of the modified composite adsorbent obtained in example 1 was added to the solution, and the supernatant was taken at regular intervals to measure the concentration of the solution, and the reaction was carried out until the adsorption reached equilibrium. For the Congo red solution, the adsorption amount is maximum when the pH is 4, the adsorption amount reaches 2080mg/g, the adsorption amount is reduced along with the increase of the pH, and the adsorption of methyl orange and reactive blue is basically not influenced by the pH. The modified composite adsorbent has strong adsorption capacity to various anionic dyes in the range from acidity to alkalinity. FIG. 3 is a graph of the effect of applying the pH of example 2 to the treatment of ionic dyes with a modified composite adsorbent. As can be seen from FIG. 3, the modified composite adsorbent has good adsorption capacity for dyes under different pH conditions, which indicates that the modified composite adsorbent is not easily affected by the external pH value, and has a wide application range.
Application example 3
The experimental conditions were: the volume of 50ml, the anionic dye reactive blue with the concentration of 30mg/L and the cationic dye basic fuchsin containing amino are mixed, the pH value of the mixed solution is respectively adjusted to be 4 and 6, 30mg/L of the modified composite adsorbent obtained in the example 1 is added into the mixed solution, and the ultraviolet spectrograms of the mixed solution before and after the modified composite adsorption are measured. As a result, the modified composite adsorbent can adsorb the two dyes at the same time when the pH value is 6, and can selectively adsorb the anionic dye reactive blue when the pH value is 4.
FIG. 4 is an adsorption spectrum of the modified composite adsorbent in application example 3 at different pH values in the adsorption process of an anionic/cationic dye mixed system. Wherein, when the pH value is (a) near neutral and (b) acidic, the characteristic peaks of basic fuchsin and reactive blue are simultaneously reduced when the pH value is near neutral, and the modified composite adsorbent can simultaneously adsorb the anionic dye of reactive blue and the cationic dye of basic fuchsin containing amino; when the pH value is acidic, only the characteristic peak of the active blue is reduced, and the modified composite adsorbent can selectively adsorb the anionic dye active blue, which indicates that the modified composite adsorbent can selectively adsorb the anionic dye active blue by adjusting the pH value.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A modified composite adsorbent is characterized in that aluminum salt is completely dissolved in deionized water, an alkali solution is added under stirring until the pH value of the solution is 6.5-7.5, the obtained suspension is sealed and heated at 60-120 ℃, filtered, washed, dried and ground, and then heated at 40-80 ℃ to prepare aluminum oxide; adding alumina into acetic acid solution of chitosan, stirring at 40-90 ℃, adding glutaraldehyde to form colloid, drying, grinding, washing, and drying to obtain chitosan composite alumina; adding chitosan composite alumina into deionized water, adding a cationic surfactant, stirring, filtering, washing with ethanol and deionized water, and drying to obtain the chitosan composite alumina.
2. The modified composite adsorbent of claim 1, wherein the mass to volume ratio of the aluminum salt to the deionized water is (3-8) g: (20-60) ml; the aluminum salt is aluminum sulfate octadecahydrate or/and aluminum chloride.
3. The modified composite adsorbent of claim 1, wherein the alkali solution is sodium hydroxide solution, potassium hydroxide or ammonia water; the concentration of the alkali solution is 0.2-5 mol/L.
4. The modified composite adsorbent of claim 1, wherein said cationic surfactant is an alkyl quaternary ammonium salt or a heterocyclic quaternary ammonium salt.
5. The modified composite adsorbent of claim 4, wherein said alkyl quaternary ammonium salt is cetyl trimethyl ammonium bromide or dimethyl cetyl allyl ammonium chloride, and said heterocyclic quaternary ammonium salt is dodecyl pyridinium chloride quaternary ammonium salt or dodecyl quinoline bromide.
6. The modified composite adsorbent of claim 1, wherein the ratio of the mass of alumina, the mass of chitosan, the volume of acetic acid and the volume of glutaraldehyde is (0.05-0.5) g: (0.04-0.4) g: (20-50) ml: (0.5-0.25) ml, wherein the concentration of the acetic acid is 1-15 vol%.
7. The modified composite adsorbent of claim 1, wherein the volume ratio of the mass of the chitosan composite alumina to the mass of the cationic surfactant to the deionized water is (0.05-0.5) g: (0.01-0.1) g: (20-50) ml.
8. The modified composite adsorbent of claim 1, wherein the drying temperature is 40-90 ℃ and the drying time is 1-20 h.
9. The method for preparing the modified composite adsorbent according to any one of claims 1 to 8, characterized by comprising the following specific steps:
s1, completely dissolving aluminum salt in water, adding an alkali solution while stirring until the pH value of the solution is 6.5-7.5, sealing the obtained suspension, heating for 6-24 hours at 60-120 ℃, filtering, washing with ethanol and deionized water, drying, grinding and heating to obtain aluminum oxide;
s2, adding alumina into an acetic acid solution of chitosan, stirring at 40-90 ℃ to obtain a solution A, stirring at 40-90 ℃, adding glutaraldehyde to form a colloid, drying, grinding the dried solid, washing with deionized water and ethanol, and drying to obtain chitosan composite alumina;
and S3, adding the chitosan composite alumina into deionized water, adding a cationic surfactant, stirring for 0.5-5 h, filtering, washing with ethanol and deionized water, and drying to obtain the cationic surfactant modified chitosan coated alumina composite adsorbent.
10. The use of the modified composite adsorbent of any one of claims 1 to 8 in the field of adsorption of dyes in printing and dyeing wastewater, wherein the dyes are anionic dyes or/and amino-containing cationic dyes.
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| CN112871137A (en) * | 2021-01-21 | 2021-06-01 | 辽宁大学 | Preparation method of functionalized aluminate adsorbing material and application of functionalized aluminate adsorbing material in removal of various pollutants |
| CN114471478A (en) * | 2022-02-09 | 2022-05-13 | 南京林业大学 | Chitosan-humic acid composite broad-spectrum amphoteric adsorbent and preparation method and application thereof |
| CN116590096A (en) * | 2023-07-14 | 2023-08-15 | 中冠生物科技(珲春)有限公司 | Method for removing cholesterol in antarctic krill oil |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112871137A (en) * | 2021-01-21 | 2021-06-01 | 辽宁大学 | Preparation method of functionalized aluminate adsorbing material and application of functionalized aluminate adsorbing material in removal of various pollutants |
| CN114471478A (en) * | 2022-02-09 | 2022-05-13 | 南京林业大学 | Chitosan-humic acid composite broad-spectrum amphoteric adsorbent and preparation method and application thereof |
| CN116590096A (en) * | 2023-07-14 | 2023-08-15 | 中冠生物科技(珲春)有限公司 | Method for removing cholesterol in antarctic krill oil |
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