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Preparation method of monatomic catalyst for activating sulfite to degrade pollutants

A technology for activating sulfite and pollutants, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, water pollutants, etc., to achieve remarkable catalytic effect, simple and effective synthesis method, and high specific surface area

Active Publication Date: 2021-06-04
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also a small number of reports on single-atom cobalt and single-atom manganese, which are used to activate persulfate to degrade organic pollutants, but there is no report on the activation of single-atom iron to generate sulfate radicals to degrade organic pollutants.

Method used

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  • Preparation method of monatomic catalyst for activating sulfite to degrade pollutants
  • Preparation method of monatomic catalyst for activating sulfite to degrade pollutants
  • Preparation method of monatomic catalyst for activating sulfite to degrade pollutants

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A method for preparing a single-atom catalyst for activating sulfite to degrade pollutants, comprising the steps of:

[0030] (1) Pretreatment of raw materials: drying sodium lignosulfonate at a low temperature of 55°C for 2 hours for later use, then mixing sodium lignosulfonate and ferric nitrate in a ratio of 5:4;

[0031] (2) Mechanical ball milling: Add the above mixture into a mechanically activated solid-phase reactor, and carry out ball milling reaction at a speed of 400r / min and a constant temperature water bath temperature of 50°C. After 20min, stop the ball milling to obtain a dark brown mixture;

[0032] (3) High-temperature carbonization: Add the mixture in step (2) to a high-temperature tube furnace, raise the temperature to 750°C at a heating rate of 5°C / min, keep the temperature at 750°C for 2 hours, and then cool to 10°C / min. At room temperature, a black carbonized sample was obtained;

[0033] (4) Pickling: After grinding the carbonized sample in step ...

Embodiment 2

[0041] A method for preparing a single-atom catalyst for activating sulfite to degrade pollutants, comprising the steps of:

[0042] (1) Pretreatment of raw materials: drying sodium lignosulfonate at a low temperature of 55°C for 2 hours for later use, then mixing sodium lignosulfonate and ferric nitrate in a ratio of 5:4;

[0043] (2) Mechanical ball milling: Add the above mixture into a mechanically activated solid-phase reactor, and carry out ball milling reaction at a speed of 400r / min and a constant temperature water bath temperature of 50°C. After 20min, stop the ball milling to obtain a dark brown mixture;

[0044] (3) High-temperature carbonization: Add the mixture in step (2) to a high-temperature tube furnace, raise the temperature to 450°C at a heating rate of 5°C / min, keep the temperature at 450°C for 2 hours, and then cool to 10°C / min at a cooling rate of At room temperature, a black carbonized sample was obtained;

[0045] (4) Pickling: After grinding the carbon...

Embodiment 3

[0049] A method for preparing a single-atom catalyst for activating sulfite to degrade pollutants, comprising the steps of:

[0050] (1) Pretreatment of raw materials: drying sodium lignosulfonate at a low temperature of 55°C for 2 hours for later use, then mixing sodium lignosulfonate and ferric nitrate in a ratio of 5:4;

[0051] (2) Mechanical ball milling: Add the above mixture into a mechanically activated solid-phase reactor, and carry out ball milling reaction at a speed of 400r / min and a constant temperature water bath temperature of 50°C. After 20min, stop the ball milling to obtain a dark brown mixture;

[0052] (3) High-temperature carbonization: Add the mixture in step (2) to a high-temperature tube furnace, raise the temperature to 600°C at a heating rate of 5°C / min, keep the temperature at 600°C for 2 hours, and then cool it down to 10°C / min. At room temperature, a black carbonized sample was obtained;

[0053] (4) Pickling: After grinding the carbonized sample ...

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Abstract

The invention belongs to the technical field of nano-catalysts, and particularly relates to a preparation method of a monatomic catalyst for activating sulfite to degrade pollutants. The method comprises the following steps: preliminarily mixing lignin and ferric nitrate according to a certain proportion, and placing in a mechanical ball mill for ball milling to obtain a pretreated mixture; putting the mixture into a high-temperature tube furnace, and calcining under the protection of high-purity nitrogen to obtain a carbonized sample; carrying out secondary ball milling on the carbonized sample, soaking and washing with a dilute HCl solution, and washing with deionized water until the sample is neutral; and primarily drying the washed sample at a low temperature, putting the dried sample into a high-temperature tube furnace, and carrying out secondary calcination under the protection of high-purity nitrogen to obtain a final catalyst sample. The method provided by the invention is simple and effective, can be used for large-scale synthesis of monatomic catalysts, and overcomes the defects of complex synthesis and difficulty in large-scale preparation in other technologies in the prior art.

Description

technical field [0001] The invention belongs to the technical field of nanometer catalysts, and in particular relates to a preparation method of a single-atom catalyst for activating sulfite to degrade pollutants. Background technique [0002] Sulfate radical-based Fenton-like advanced oxidation technology, which is used to degrade organic pollutants by generating sulfate radicals with stronger oxidizing properties than hydroxyl radicals, has been considered as one of the most promising methods in wastewater treatment. Sulfite can generate sulfate radicals in the process of autoxidation to sulfate. This process has been widely used in the degradation of organic matter in wastewater, but the reaction free energy in this process is relatively large. Later, by introducing a catalyst to activate sulfurous acid to generate free radicals, good results can be achieved. At present, the commonly used ones are homogeneous catalyst transition metal salts and their oxides, etc., and he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/043B01J27/24B01J35/00B01J35/10B01J37/08C02F1/72C02F101/30
CPCB01J37/084B01J27/043B01J27/24C02F1/725C02F2101/308B01J35/391B01J35/618B01J35/617B01J35/60
Inventor 伍娟黄祖强张燕娟田植群胡华宇黄爱民冯振飞梁立喆黄超弟张慧丽
Owner GUANGXI UNIV
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