Carboxymethyl chitosan-cyclodextrin-activated carbon composite material and application thereof

A technology of carboxymethyl chitosan and composite materials, applied in the directions of alkali metal compounds, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problems of solid waste pollution, high operating costs, short service life, etc. , to achieve the effect of low purification cost, convenient operation and excellent water purification effect

Inactive Publication Date: 2020-09-22
李伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are mainly chemical methods, physical methods, physicochemical methods and biological methods to treat and control domestic and industrial sewage. Among them, physical methods are commonly used methods. The adsorption process is simple and reliable. It can be used as a separate treatment method or It can be used in conjunction with chemical and biological methods, and has become a common method for treating domestic and industrial sewage. At present, there are more and more studies on the use of adsorption methods to treat domestic and industrial sewage at home and abroad. Commonly used adsorbents include activated carbon, zeolite, and diatoms. Soil, etc., although the existing adsorbents have large adsorption capa

Method used

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  • Carboxymethyl chitosan-cyclodextrin-activated carbon composite material and application thereof
  • Carboxymethyl chitosan-cyclodextrin-activated carbon composite material and application thereof
  • Carboxymethyl chitosan-cyclodextrin-activated carbon composite material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A carboxymethyl chitosan-cyclodextrin-activated carbon composite material is prepared according to the following steps:

[0038] ① Preparation of carboxymethyl chitosan:

[0039] Add chitosan to isopropanol, continue stirring for 30-60 minutes, add sodium hydroxide, control the temperature of the reaction solution at 35°C during the addition process, stop adding sodium hydroxide when the pH value of the reaction solution is 8.5, Continue to stir for 30 minutes, then dropwise add chloroacetic acid isopropanol solution, control the temperature of the reaction solution below 45°C during the dropwise addition, raise the temperature to 50°C after the dropwise addition, stir and react for 6 hours, add the first ethanol precipitation, filter, filter The cake is washed with second ethanol and dried to obtain carboxymethyl chitosan;

[0040] The mass concentration of chloroacetic acid in the chloroacetic acid isopropanol solution is 8%;

[0041] Wherein the mass ratio of chito...

Embodiment 2

[0047] A carboxymethyl chitosan-cyclodextrin-activated carbon composite material is prepared according to the following steps:

[0048] ① Preparation of carboxymethyl chitosan:

[0049] Add chitosan to isopropanol, continue stirring for 60 minutes, add sodium hydroxide, control the temperature of the reaction solution at 45°C during the addition process, stop adding sodium hydroxide when the pH value of the reaction solution is between 9.0, Continue to stir for 60 minutes, then dropwise add chloroacetic acid isopropanol solution, control the temperature of the reaction solution below 45°C during the dropwise addition, raise the temperature to 55°C after the dropwise addition, stir and react for 6 hours, add the first ethanol precipitation, filter, filter The cake is washed with second ethanol and dried to obtain carboxymethyl chitosan;

[0050] The mass concentration of chloroacetic acid in the chloroacetic acid isopropanol solution is 12%;

[0051] Wherein the mass ratio of...

Embodiment 3

[0057] A carboxymethyl chitosan-cyclodextrin-activated carbon composite material is prepared according to the following steps:

[0058] ① Preparation of carboxymethyl chitosan:

[0059] Add chitosan to isopropanol, continue to stir for 50 minutes, add sodium hydroxide, control the temperature of the reaction solution at 40°C during the addition process, stop adding hydroxide when the pH value of the reaction solution is between 8.5 and 9.0 Sodium, continue to stir for 45 minutes, then dropwise add chloroacetic acid isopropanol solution, control the temperature of the reaction solution below 45°C during the dropwise addition, raise the temperature to 50-55°C after the dropwise addition, stir for 6 hours, add the first ethanol to precipitate , filtered, the filter cake was washed with second ethanol, and dried to obtain carboxymethyl chitosan;

[0060] The mass concentration of chloroacetic acid in the chloroacetic acid isopropanol solution is 9%;

[0061] Wherein the mass rat...

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Abstract

The invention discloses a carboxymethyl chitosan-cyclodextrin-activated carbon composite material for treating sewage. 6-aminated cyclodextrin is used as a cross-linking agent to crosslink carboxymethyl chitosan into a complex network structure, and activated carbon molecules are uniformly distributed on the network structure to form a composite material with huge molecular structure and strong adsorption capacity; firstly, the molecular structure is huge, the adsorption capacity is high, various pollutants such as proteins, carbohydrates, fat, urea or ammonia nitrogen in sewage can be adsorbed, heavy metal ions in the sewage can also be adsorbed, and the water purification effect is superior to that of a traditional inorganic water purification agent; by adopting the water treatment agentfor treating the sewage, various eutrophic ions and heavy metals in the sewage can be effectively removed at the same time, and the limitation that a conventional water treatment agent can only adsorb and remove single nitrogen-rich or phosphorus-rich nutrient elements is broken through.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a carboxymethyl chitosan-cyclodextrin-activated carbon composite material for sewage treatment and a sewage treatment agent prepared therefrom. Background technique [0002] Pollutants of domestic sewage and industrial sewage are mainly organic matter and various heavy metal ions, such as protein, carbohydrate, fat, urea or ammonia nitrogen, etc., heavy metal ions such as lead, chromium, etc., eutrophication is serious, and the types of pollutants are relatively miscellaneous. Unstable, easy to rot and produce stench, so domestic and industrial sewage must be treated before discharge; [0003] At present, there are mainly chemical methods, physical methods, physicochemical methods and biological methods to treat and control domestic and industrial sewage. Among them, physical methods are commonly used methods. The adsorption process is simple and reliable. It can be used...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/20B01J20/22B01J20/24B01J20/267B01J20/28014C02F1/288C02F2101/20
Inventor 董凤娟李伟杨永安
Owner 李伟
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