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Modified composite adsorbent as well as preparation method and application thereof

A composite adsorption and modification technology, used in chemical instruments and methods, adsorbed water/sewage treatment, alkali metal compounds, etc., can solve the problems of lack of adsorption groups, large specific surface area, easy to dissolve, etc., and achieve no secondary pollution. , high processing efficiency, simple preparation effect

Inactive Publication Date: 2020-01-10
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chitosan is an environmentally friendly organic dye adsorbent. The amino and hydroxyl functional groups contained in it have good adsorption properties for dye molecules, but it is easy to dissolve in acidic conditions due to the protonation of amino groups.
Alumina is a traditional inorganic industrial material, usually used as an absorbent and a catalyst, with a large specific surface area, high stability, and pore volume, but lacks adsorption groups

Method used

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  • Modified composite adsorbent as well as preparation method and application thereof
  • Modified composite adsorbent as well as preparation method and application thereof
  • Modified composite adsorbent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Add 6.18g of aluminum sulfate octadecahydrate to 30ml of deionized water. After fully dissolving, add 1mol / L sodium hydroxide solution under magnetic stirring to adjust the pH of the solution to 7, and ripen at 105°C for 18 Hours, after filtering, wash twice with 15ml ethanol, then wash with 15ml deionized water, dry in an oven at 60°C for 5 hours to obtain aluminum hydroxide solid, and heat aluminum hydroxide solid at 500°C for 3 hours in a muffle furnace to obtain alumina ;

[0034] 2. Dissolve 0.2g chitosan in 30ml acetic acid solution (1%), add 0.2g aluminum oxide again, under magnetic stirring, adjust solution temperature to 60 ℃, add 1.5ml glutaraldehyde (25%), generate The yellow colloid was then dried in an oven at 60°C for 14 hours, washed with 15ml of ethanol and deionized water after grinding, and then dried in an oven at 60°C for 1 hour to obtain a chitosan composite alumina adsorbent;

[0035] 3. Dissolve 0.06g of cetyltrimethylammonium bromide in 30ml ...

Embodiment 2

[0038]1. Add 8g of aluminum chloride to 60ml of deionized water. After fully dissolving, add 5mol / L sodium hydroxide solution under magnetic stirring to adjust the pH of the solution to 7.5. Mature at 60°C for 6 hours under sealed conditions, and filter After that, wash twice with 15ml of ethanol, then wash with 15ml of deionized water, dry in an oven at 80°C for 9 hours to obtain aluminum hydroxide solid, and heat the aluminum hydroxide solid at 500°C for 3 hours in a muffle furnace to obtain alumina;

[0039] 2. 0.5g chitosan is dissolved in 50ml acetic acid solution (5%), then add 0.2g aluminum oxide, under magnetic stirring, adjust solution temperature to 40 ℃, add 2.5ml glutaraldehyde (25%), generate The yellow colloid was then dried in an oven at 90°C for 18 hours, washed with 15ml of ethanol and deionized water after grinding, and then dried in an oven at 90°C for 3 hours to obtain a chitosan composite alumina adsorbent;

[0040] 3. Dissolve 0.1g of cetyltrimethylammoni...

Embodiment 3

[0042] 1. Add 3g of aluminum sulfate to 20ml of deionized water. After fully dissolving, add 0.2mol / L sodium hydroxide solution under magnetic stirring to adjust the pH of the solution to 6.5. Mature at 120°C for 24 hours under sealed conditions, and filter After that, wash twice with 2ml of ethanol, then wash with 2ml of deionized water, dry in an oven at 40°C for 18 hours to obtain aluminum hydroxide solid, and heat the aluminum hydroxide solid at 500°C for 3 hours in a muffle furnace to obtain alumina;

[0043] 2. 0.05g chitosan is dissolved in 20ml acetic acid solution (15%), then add 0.05g alumina, under magnetic stirring, adjust the solution temperature to 90 ℃, add 0.5ml glutaraldehyde (25%), generate The yellow colloid was then dried in an oven at 40°C for 15 hours, washed with 15ml of ethanol and deionized water after grinding, and then dried in an oven at 90°C for 1 hour to obtain a chitosan composite alumina adsorbent;

[0044] 3. Dissolve 0.01g of dimethylhexadecyl...

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Abstract

The invention belongs to the field of water treatment, and discloses a modified composite adsorbent as well as a preparation method and application thereof. The preparation method of the modified composite adsorbent comprises the following steps: adding an aluminum salt aqueous solution into an alkaline solution under stirring until the pH value of an obtained solution is 6.5-7.5, heating an obtained suspension in a sealed manner, filtering, washing, drying and heating to obtain aluminum oxide; adding aluminum oxide in an acetic acid solution of chitosan, adding glutaraldehyde to form a colloid, drying, grinding, washing, drying, adding an obtained chitosan composite aluminum oxide into deionized water, adding a cationic surfactant, stirring, filtering, washing with ethanol and deionizedwater, and drying to obtain a finished product. The preparation method of the modified composite adsorbent is simple, and the adsorbent has the advantages of strong adsorption capacity, high adsorption efficiency on ionic dyes, easiness in separation from a reaction solution, no secondary pollution to the environment and the like, can effectively adsorb the ionic dyes in printing and dyeing wastewater, and is suitable for treating the printing and dyeing wastewater containing the ionic dyes.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and more specifically relates to a modified composite adsorbent and its preparation method and application. Background technique [0002] Modern industry needs a large amount of chemical raw materials to support its daily production, among which ionic dyes are very important and indispensable, especially in the fields of papermaking, textile and food processing. However, due to the characteristics of non-degradability, bioaccumulation, toxicity and carcinogenicity of ionic dyes, if they are discharged into the environment without proper treatment, they will pose a huge threat to the safety of water ecosystems and human health. [0003] The current adsorption materials for treating dye wastewater are often aimed at a single pollutant, but the actual printing and dyeing wastewater is often a mixed system of various dyes. It is difficult for conventional adsorption materials to effectively a...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/30
CPCB01J20/08B01J20/24B01J20/28011C02F1/281C02F1/286C02F2101/308
Inventor 汤兵蔡禹皓宾丽英
Owner GUANGDONG UNIV OF TECH
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