Preparation method of manganese-based metal catalyst for advanced treatment of coal chemical wastewater

Abstract

The invention provides a preparation method of a manganese-based catalyst. The preparation method comprises the steps of synthesis of active ingredients, amination modification and doping and catalystforming. The catalyst provided by the invention has the advantages that 1) the performance of catalyzing ozone to oxidize refractory organic matters in coal chemical industry wastewater is obviouslysuperior to that of an aluminum-based catalyst prepared by an existing impregnation method, and the catalyst is stable in property and good in reaction activity; 2) MnO2 with excellent performance isgenerated through oxidation-reduction reaction of a double-reduction system by adopting a hydrothermal synthesis method, the stability of the catalyst is improved through the amination modification, and the modification is carried out in a graphene (GO) doping manner in order to improve the electron transmission efficiency in the reaction process; 3) the doping of low-valent metals magnesium and iron is beneficial to improving the content of oxygen vacancies in the catalyst and contributing to the generation of active oxygen, and 4) the amination modification can obviously improve the stability of the catalyst, contributes to the reuse of the catalyst, and has very important significance for reducing the cost of organic matters in the catalytic ozonation coal chemical industry wastewater.

Description

technical field [0001] The invention relates to a preparation method of a manganese-based metal catalyst for the advanced treatment of coal chemical wastewater, especially an ozone-catalyzed oxidation catalyst for the removal of refractory heterocyclic compounds in coal chemical wastewater. The "noble metal-graphene-alumina" composite catalyst is used in the technical field of wastewater treatment and belongs to the field of industrial catalysis. Background technique [0002] The characteristics of my country's energy structure with more coal and less oil determine that coal chemical industry has important strategic significance in ensuring national energy security. As an important field of direct utilization of coal, coal chemical industry will produce different amounts of wastewater in each production section, and coal chemical wastewater has high pollutant concentration, complex composition and difficult treatment. In 2018, China's coke production capacity was 680 millio...

AI Technical Summary

Problems solved by technology

In 2018, China's coke production capacity was 680 million tons, and the waste water produced per ton of coke was 0.5m3. Coal chemical industry wastewater contained 588 kinds of organic substances, including phenol, quinoline, pyridine and other refractory organic substances. Evaporation and crystallization cannot operate normally, and the crystallized salt must be disposed of as hazardous waste, which significantly increases the cost of wastewater treatment and the risk of environmental pollution, and seriously restricts the green and sustainable development of the coal chemical industry, which is an urgent problem to be solved

[0004] At present, there has been a lot of research on catalysts for catalytic oxidation of ozone. The active components of the catalysts are mainly various metal oxides (oxides of elements such as Mn, Fe, Cu, Co), and the catalyst supports mainly include Al3O2, CeO2, activated carbon, etc. , zeolite, silica, etc., but there are few reports on Mg series catalysts

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