Preparation method of binary-metal-oxide composite solid acid catalyst and application of catalyst to treatment of organic wastewater

Abstract

The invention relates to a preparation method of a binary-metal-oxide composite solid acid catalyst and an application of the binary-metal-oxide composite solid acid catalyst to the treatment of organic wastewater, belonging to the field of treatment and catalytic reaction of wastewater in environmental protection. The preparation method comprises the following steps: mixing an ethanol solution of SnCl4.5H2O with Fe2(SO4)3, and adjusting the pH value of the mixture to 9 by using aqueous ammonia to form sol, wherein the ethanol solution of SnCl4.5H2O and the Fe2(SO4)3 are at a certain mass ratio; and ageing, washing, settling centrifugally, drying, grinding and sieving the sol, stirring and mixing the sol and washed and dried diatomaceous earth violently by using a ball grinder, and calcining the mixture at a high temperature to obtain a tin-ferrum-silicon solid acid which takes a metal oxide as an accelerator. The solid acid catalyst can form a heterogeneous Fenton system together with hydrogen peroxide to degrade pollutants and can be used for rapidly and effectively degrading the methylene-blue simulated wastewater, the methyl-orange simulated wastewater, the m-nitrobenzene simulated wastewater, the turquoise-blue dye wastewater, the glyphosate pesticide wastewater and the pharmaceutical-intermediate wastewater without adjusting the pH value of the wastewater, thus fewer reagents are used. The solid acid catalyst has an effect of bleaching by nearly 100% and a strong sedimentation performance and can be recycled.

Description

technical field [0001] The invention relates to the application of a metal oxide composite solid acid catalyst in a Fenton-like reaction. Wastewater treatment in the field of environmental protection. It is technically involved in the fields of catalytic reaction and so on. Background technique [0002] With the rapid development of my country's national economy, industries such as chemical industry, pharmaceuticals, oil refining, and papermaking are playing an increasingly important role in the national economy. At the same time, industrial development has brought more and more pollution to the environment on which human beings depend, and the relatively lagging development of industrial wastewater treatment technology has caused the limitations of sewage treatment, making my country's water environment face serious challenges. At present, a large amount of high-content, toxic and harmful refractory organic wastewater is produced, especially the development of pharmaceuti...

AI Technical Summary

Problems solved by technology

The homogeneous Fenton method is widely used in wastewater treatment. Under acidic conditions, H 2 o 2 The generated OH has a high oxidation-reduction potential, which can quickly oxidize pollutants in wastewater without selectivity, and can crack large molecular organic substances that are difficult to biodegrade in wastewater into small molecular organic substances that are easy to be degraded by microorganisms, or completely mineralized However, some disadvantages of the homogeneous Fenton method make its application scope very limited: the reaction should be carried out under the environment of about pH ≈ 3, and the pH value of the wastewater needs to be adjusted before and after the reaction, which requires a lot of acid and alkali; the reaction The chromaticity of the final wastewater is high; catalysts such as iron ions in the homogeneous system are easily precipitated, difficult to recover and prone to secondary pollution

In summary, the homogeneous Fenton method is more costly in wastewater treatment engineering

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