Method for preparing starch carbon-based Fenton-like catalyst based on EDTA chelation technology

A catalyst and starch technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of low catalytic efficiency, inability to fix uniformly and effectively, and large copper ion dissolution

Active Publication Date: 2021-12-24
GUANGXI ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, the metal source is either wrapped or clustered on the surface of the carbon base, unable to enter the internal structure of the carbon base, and cannot be uniformly and effectively fixed in the catalyst, so there are problems such as low catalytic efficiency and large dissolution of copper ions. Moreover, the carbonization treatment needs to be carried out at 500-800 °C, and a large amount of tar and volatile gas will be produced at the same time, and the yield is low (15-25%), which is difficult to apply to actual production treatment

Method used

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  • Method for preparing starch carbon-based Fenton-like catalyst based on EDTA chelation technology
  • Method for preparing starch carbon-based Fenton-like catalyst based on EDTA chelation technology
  • Method for preparing starch carbon-based Fenton-like catalyst based on EDTA chelation technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Add 100 parts of deionized water, 100 parts of cornstarch and 2 parts of NaCl into a three-necked round-bottomed flask, mechanically stir at a speed of 200r / min, adjust the pH value to 10.0, add 5 parts of ethylenediaminetetraacetic acid di Sodium EDTA-2Na, then drop 3 parts of epichlorohydrin, and heat it in a water bath to 55°C for 300 minutes to obtain a cross-linked polymer; among them, deionized water, corn starch, ethylenediaminetetraacetic acid disodium EDTA-2Na and The mass ratio of epichlorohydrin is 100:100:5:3;

[0056] (2) Add 1 part of FeCl dissolved in 20 parts of deionized water to the cross-linked polymer obtained in step (1) 3 ·6H 2 O and 3 parts CuCl 2 2H 2 O, maintain a stirring speed of 200r / min, react at 85°C for 360min, and then cool to room temperature to obtain a catalyst precursor;

[0057] (3) Place the catalyst precursor obtained in step (2) in a polytetrafluoroethylene hydrothermal reaction kettle, and treat it with hot water at 220°C...

Embodiment 2

[0061] (1) Add 100 parts of deionized water, 100 parts of corn starch, and 2 parts of NaCl into a three-necked round-bottomed flask, mechanically stir at a speed of 200r / min, adjust the pH value to 10.0, and then add 5 parts of ethylenediaminetetraacetic acid Disodium EDTA-2Na, then drop 3 parts of epichlorohydrin, heat in a water bath to 55°C and react for 300 minutes to obtain a cross-linked polymer; among them, deionized water, corn starch, ethylenediaminetetraacetic acid disodium EDTA-2Na The mass ratio with epichlorohydrin is 100:100:5:3;

[0062] (2) Add 0.5 parts of FeCl dissolved in 20 parts of deionized water to the cross-linked polymer obtained in step (1) 3 ·6H 2 O and 3 parts CuCl 2 2H 2 O, maintain a stirring speed of 200r / min, react at 85°C for 360min, and then cool to room temperature to obtain a catalyst precursor;

[0063] (3) Place the catalyst precursor obtained in step (2) in a polytetrafluoroethylene hydrothermal reaction kettle, and treat it with hot ...

Embodiment 3

[0065] (1) Add 100 parts of deionized water, 100 parts of potato starch, and 2 parts of NaCl into a three-necked round-bottomed flask, mechanically stir at a speed of 200r / min, adjust the pH value to 10.0, and then add 5 parts of ethylenediaminetetraacetic acid Disodium EDTA-2Na, then drop 3 parts of sodium hexametaphosphate, and heat in a water bath to 55°C for 300 minutes to obtain a cross-linked polymer; among them, deionized water, potato starch, ethylenediaminetetraacetic acid disodium EDTA-2Na The mass ratio with cyclic sodium hexametaphosphate is 100:100:5:3;

[0066] (2) Add 1 part of FeCl dissolved in 20 parts of deionized water to the cross-linked polymer obtained in step (1) 3 ·6H 2 O and 2 parts CuCl 2 2H 2 O, maintain a stirring speed of 200r / min, react at 85°C for 360min, and then cool to room temperature to obtain a catalyst precursor;

[0067] (3) Place the catalyst precursor obtained in step (2) in a polytetrafluoroethylene hydrothermal reaction kettle, an...

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Abstract

The invention belongs to the technical field of catalysts, and provides a method for preparing a starch carbon-based Fenton-like catalyst based on an EDTA chelation technology, the method comprises the following steps: firstly, cross-linking starch and disodium ethylene diamine tetraacetate EDTA-2Na by using a cross-linking agent to form a high polymer; uniformly chelating a large amount of metal ions on a high polymer by using ammonia nitrogen and carboxyl oxygen functional groups with extremely strong coordination ability in disodium ethylene diamine tetraacetate, so that the metal loading capacity of the catalyst is improved, and the prepared Fenton-like catalyst is high in skeleton strength, high in catalytic efficiency and low in metal ion dissolution rate; meanwhile, incomplete carbonization is generated by utilizing low-temperature hydrothermal carbonization so that tar and volatile gas are prevented from being generated, and the yield is as high as 50%. Results of the embodiment show that when the starch carbon-based Fenton-like catalyst prepared by the preparation method is used for degrading rhodamine B, the degradation efficiency can reach 98.9% within 10 minutes, and after five times of circulation, the degradation rate of rhodamine B can still reach 96.5% within 15 minutes.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a method for preparing starch-based carbon-based Fenton catalysts based on EDTA chelation technology. Background technique [0002] Fenton oxidation technology is a wastewater treatment method that uses a Fenton catalyst for chemical oxidation. Fenton catalysts are further divided into homogeneous and heterogeneous (heterogeneous) catalysts. Traditional homogeneous catalysts have high catalytic efficiency, but have disadvantages such as a small applicable pH range, difficult iron sludge treatment, and difficult reuse of catalysts. Heterogeneous catalysts It can effectively broaden the pH range and application environment of the Fenton reaction, and at the same time, the catalyst is easy to recycle, which greatly reduces the generation of iron sludge. Therefore, the development of Fenton-like catalysts with high metal content, uniform dispersion, high stability and recyclable u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J37/10C02F1/72C02F101/34C02F101/36C02F101/38
CPCB01J23/745B01J37/10C02F1/725C02F2305/026C02F2101/308C02F2101/34C02F2101/36C02F2101/38Y02P20/584
Inventor 冼学权黄岗杜奇石黎演明黄华林杜芳黎龙思宇郑益华马蓝宇
Owner GUANGXI ACAD OF SCI
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