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Nanofiber cellulose-based hydrogel loaded metal catalyst for degrading trichlorophenol in water body and preparation method of catalyst

A technology of nano-cellulose and metal catalysts, applied in alkali metal compounds, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of unsatisfactory recycling effects, secondary pollution of nanoparticles, and weak binding of silver particles To achieve good biodegradability, broaden the concentration range, and avoid poor reduction effect

Active Publication Date: 2017-06-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it exhibits high activity, the recycling effect is not ideal, the strength of the hydrogel is low, and the reactive ions on the hydrogel do not bind the silver particles strongly, which may lead to the release of nano-silver into the water environment , causing secondary pollution of nanoparticles

Method used

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  • Nanofiber cellulose-based hydrogel loaded metal catalyst for degrading trichlorophenol in water body and preparation method of catalyst
  • Nanofiber cellulose-based hydrogel loaded metal catalyst for degrading trichlorophenol in water body and preparation method of catalyst
  • Nanofiber cellulose-based hydrogel loaded metal catalyst for degrading trichlorophenol in water body and preparation method of catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) First put the nanocellulose solution in an Erlenmeyer flask, put it into a 50°C rotary evaporator to evaporate, remove the excess water contained therein, and obtain a nanocellulose suspension with a solid content of 2%. Take 8.5g of nanocellulose suspension and place it in a three-necked flask, then add 13.0g of polyvinyl alcohol solution with a concentration of 10wt%, and 13g of carboxymethylcellulose solution with a concentration of 2wt%, stir mechanically, and heat in a water bath at 60°C React for 55 minutes.

[0038] (2) Add 0.4 ml of glacial acetic acid to the mixed solution obtained in step (1), and then add 2 ml of a cross-linking agent glutaraldehyde solution with a mass concentration of 25% dropwise after 15 minutes. Add once, the interval between two times is 5min, and react for 0.5 hour after the dropwise addition is completed;

[0039] (3) After the reaction is completed, the vacuum treatment is carried out immediately. When a certain degree of vacuum...

Embodiment 2

[0046] (1) First put the nanocellulose solution in an Erlenmeyer flask, put it into a 50°C rotary evaporator to evaporate, remove the excess water contained therein, and obtain a nanocellulose suspension with a solid content of 3%. Take 14.1g of nanocellulose suspension and place it in a three-necked flask, then add 13.0g of polyvinyl alcohol solution with a concentration of 10wt%, and 19.5g of carboxymethylcellulose solution with a concentration of 2wt%, stir mechanically, and place in a water bath at 45°C The reaction was heated for 75 minutes.

[0047] (2) Add 0.7ml of glacial acetic acid to the mixed solution obtained in step (1), and then add 3ml of a cross-linking agent glutaraldehyde solution with a mass concentration of 25% dropwise after 15 minutes. Add once, the interval between two times is 5min, and react for 1.5 hours after the dropwise addition is completed;

[0048] (3) After the reaction is completed, the vacuum treatment is carried out immediately. When a cer...

Embodiment 3

[0055] (1) First put the nanocellulose solution in an Erlenmeyer flask, put it into a 50°C rotary evaporator to evaporate, remove the excess water contained therein, and obtain a nanocellulose suspension with a solid content of 4%. Take 18.1g of nanocellulose suspension and place it in a three-necked flask, then add 13.0g of polyvinyl alcohol solution with a concentration of 10wt%, and 26g of carboxymethylcellulose solution with a concentration of 2wt%, stir mechanically, and heat in a water bath at 75°C React for 30 minutes.

[0056] (2) Add 1ml of glacial acetic acid to the mixed solution obtained in step (1), and then add 4ml of a cross-linking agent glutaraldehyde solution with a mass concentration of 25% dropwise after 15 minutes. Add, the interval between two times is 5min, and react for 2 hours after the dropwise addition is completed;

[0057] (3) After the reaction is completed, the vacuum treatment is carried out immediately. When a certain degree of vacuum is drawn...

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Abstract

The invention discloses a nanofiber cellulose-based hydrogel loaded metal catalyst for degrading trichlorophenol in a water body and a preparation method of the catalyst. The preparation method comprises the following steps: (1)adding a nanofiber suspension, a polyvinyl alcohol solution and a carboxymethyl cellulose solution, performing water bath heating; (2) adding glacial acetic acid and a glutaraldehyde solution to perform reaction; (3) performing vacuuming treatment, centrifuging, performing freeze thawing circulation, slicing, and drying; (4) soaking in a salt solution containing Fe<2+>, and performing reaction; (5) soaking in a sodium borohydride solution, and performing reduction; (6) soaking in a potassium chloropalladate solution, and performing reaction; (7) washing with anaerobic water, and performing vacuum drying, so as to obtain the nanofiber cellulose-based hydrogel loaded metal catalyst. The hydrogel loaded metal catalyst disclosed by the invention has an efficient and thorough reduction and degradation property on trichlorophenol and chlorophenol compounds in wastewater, has very good adsorption on trichlorophenol, is capable of treating a relatively small amount of trichlorophenol in the water body, and has a very good effect.

Description

technical field [0001] The invention belongs to the field of environmental functional composite materials, and in particular relates to a nanocellulose-based hydrogel-loaded metal catalyst for degrading trichlorophenol in water and a preparation method thereof. Background technique [0002] The governance and control of water pollution is a major problem to be solved urgently in the current human development. my country is the largest country in the paper industry, and the bleaching process is the core process of the paper industry, and it is also the main process of producing organic chlorides. Chlorophenols (CPs), as a class of strong carcinogenic and teratogenic pollutants, have been banned and restricted by countries all over the world, but because they are by-products of the bleaching process in the paper industry, there is still a certain amount of emissions every year, and in The problem of residues in the water environment and the continuous impact on aquatic organi...

Claims

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Application Information

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IPC IPC(8): B01J31/28B01J20/26B01J20/28C02F1/00C02F1/28B01J20/30C02F101/34C02F101/36
CPCB01J20/0225B01J20/0229B01J20/267B01J20/28047B01J31/28C02F1/00C02F1/288C02F2101/345C02F2101/36
Inventor 万小芳郭从宝李友明陈广学
Owner SOUTH CHINA UNIV OF TECH
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