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High-efficiency catalyst for Fenton reaction, and preparation method and application thereof

A Fenton reaction and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of inhibition of generation and oxidation efficiency, difficulty in degradation, and unsatisfactory effects. Simple preparation process, high catalytic efficiency, and the effect of reducing COD value

Active Publication Date: 2017-07-04
NANJING YUANQUAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, with the development of my country's industrial level, the use of a large number of new organic additives with strong stability has greatly increased the difficulty of related wastewater treatment, especially in the field of electroplating, new organic additives are not only difficult to degrade, but also dissociated. The complexation of heavy metal ions in the wastewater caused serious excess of COD and heavy metal ions in the wastewater. Traditional biochemical treatment methods have been difficult to meet the treatment requirements of this type of wastewater, and Fe 2+ The ordinary Fenton oxidation reaction as a catalyst has been proved to be unsatisfactory in the treatment of this type of wastewater.
The reason is that the generation and oxidation efficiency of OH are severely inhibited during the reaction process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A kind of Fenton reaction catalyst is made by following preparation method: take by weighing 0.24mol ferrous sulfate, 0.72mol cupric sulfate and 0.24mol cobalt nitrate respectively, be dissolved in 1L deionized water, then add 10% sulfuric acid to adjust The pH value of the metal salt solution is adjusted to 3-4 to prepare the Fenton reaction catalyst.

[0018] The wastewater to be treated is alkaline zinc-nickel alloy wastewater. Before treatment, the COD content is 2320mg / L, the Ni content is 20mg / L, and the Zn content is 28mg / L.

[0019] Using the Fenton reaction catalyst prepared above to treat wastewater, adjust the pH value of the wastewater to be treated to 3-4, add 2.5% hydrogen peroxide with a mass concentration of 30% and the above-mentioned Fenton reaction catalyst of 1.5% at normal temperature, stir evenly, After 1 hour of reaction, the measured COD content was 346 mg / L, Ni was 0.18 mg / L, and Zn was 0.06 mg / L.

Embodiment 2

[0025] A Fenton reaction catalyst is prepared by the following preparation method: Weigh 0.2mol ferrous sulfate, 0.4mol copper sulfate and 0.2mol cobalt nitrate and dissolve them in 1L deionized water, add 10% sulfuric acid to adjust the metal salt solution pH value to 3 to 4, the prepared Fenton reaction catalyst.

[0026] The wastewater to be treated is chemical nickel rinse water, the COD content before treatment is 1600mg / L, and the Ni is 105mg / L.

[0027] Adopt the Fenton reaction catalyst prepared above to treat wastewater, adjust the pH value of the wastewater to be treated to 3-4, add 2.5% hydrogen peroxide with a mass concentration of 30% and 1.9% of the above-mentioned Fenton reaction catalyst at normal temperature, stir evenly, After 1 hour of reaction, the measured COD content was 206 mg / L and Ni was 0.03 mg / L.

Embodiment 3

[0029] A Fenton reaction catalyst is prepared by the following preparation method: Weigh 0.3mol ferrous sulfate, 0.81mol copper sulfate and 0.3mol cobalt nitrate and dissolve them in 1L deionized water, add 10% sulfuric acid to adjust the metal salt solution pH value to 3 to 4, the prepared Fenton reaction catalyst.

[0030] The wastewater to be treated is alkaline zinc-nickel alloy wastewater. Before treatment, the COD content is 2680mg / L, the Ni content is 27mg / L, and the Zn content is 34mg / L.

[0031] Adopt the Fenton reaction catalyst prepared above to treat wastewater, adjust the pH value of the wastewater to be treated to 3-4, add 2.6% of hydrogen peroxide with a mass concentration of 30% and the above-mentioned Fenton reaction catalyst of 1.2% at normal temperature, stir evenly, After 1 hour of reaction, the measured COD content was 273 mg / L, Ni was 0.06 mg / L, and Zn was 0.01 mg / L.

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Abstract

The invention discloses a catalyst for the Fenton reaction. The catalyst is prepared from ferrous sulfate, copper sulfate and cobalt nitrate by dissolving ferrous sulfate, copper sulfate and cobalt nitrate in deionized water and then adjusting the pH value of the obtained aqueous solution of the metal salts to 3 to 4, wherein a mol ratio of ferrous sulfate to copper sulfate to cobalt nitrate is 1: 0.5: 1 to 1: 6: 1, and the ratio of the total amount of ferrous sulfate, copper sulfate and cobalt nitrate to the usage amount of deionized water is 0.8 to 1.5 mol: 1 L. The invention also discloses application of the catalyst for the Fenton reaction to treatment of electroplating wastewater containing organic matter complexes. The catalyst for the Fenton reaction is a composite catalyst containing ferrous iron, copper and cobalt and is simple to prepare; the catalyst can effectively eliminate organic matters in complexation states, and the removal rate of heavy metal complexes can reach 99% or above; and the catalyst allows nickel in effluent to reach the standard, enables the removal rate of COD to reach 85% or above and substantially reduces the COD value of the effluent.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater, especially electroplating wastewater treatment, and specifically relates to a high-efficiency Fenton reaction catalyst and its preparation method and application. Background technique [0002] The advanced oxidation technology represented by Fenton oxidation has played a huge role in the treatment of polluted water since its discovery. The essence of Fenton oxidation is to use the hydroxyl radical (OH) with super-oxidizing ability produced by Fenton reagent to destroy the molecular structure of pollutants, thereby eliminating pollution. Therefore, how to maximize the generation and oxidation efficiency of OH is a long-term goal pursued by researchers. [0003] In recent years, with the development of my country's industrial level, the use of a large number of new organic additives with strong stability has greatly increased the difficulty of related wastewater treatment, especially...

Claims

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Application Information

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IPC IPC(8): B01J27/25C02F1/72C02F103/16C02F101/20
CPCB01J27/25C02F1/722C02F1/725C02F2101/20C02F2103/16C02F2305/026
Inventor 刘航蔡大牛李瑞鹏
Owner NANJING YUANQUAN TECH CO LTD
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