Preparation method for load transition metal catalyst for ozone oxidation as well as load transition metal catalyst and application thereof

Abstract

The invention provides a preparation method for a load transition metal catalyst for ozone oxidation. The preparation method comprises the following steps: placing a catalyst carrier raw material in a NaOH aqueous solution, soaking, drying, preparing activated aluminum oxide sol, soaking catalyst particles in the activated aluminum oxide sol, drying and roasting, so as to obtain a coating, repeating the steps until a catalyst carrier coated for multiple times is obtained, enabling the content of the activated aluminum oxide coating to be 5-15% of the catalyst carrier in weight, soaking the catalyst carrier in an aqueous solution containing active constituents of transition metal, dying and roasting, so as to obtain the load transition metal catalyst. The load transition metal catalyst is high in ozone catalytic activity, the COD concentration of organic wastewater can be reduced to 50 mg / L below from 100 mg / L by the load transition metal catalyst, the load transition metal catalyst has a stable catalytic effect during the process of treating organic wastewater through catalytic ozonation, and the catalytic activity is not changed basically after the load transition metal catalyst continuously runs for multiple days in a fixed bed reactor.

Description

【Technical field】 [0001] The invention relates to a supported transition metal catalyst, in particular to a supported transition metal catalyst for ozone oxidation, its preparation method and application. 【Background technique】 [0002] In recent years, the problem of drinking water pollution has attracted widespread attention, especially some refractory organic substances in drinking water are the main pollutants that lead to the deterioration of drinking water quality, so research and development of new water treatment processes for large-scale water treatment, Effective removal of refractory organic matter in water has become a top priority. Due to its strong oxidizing properties, ozone has been widely used in the field of water treatment in recent years. [0003] However, ozone has low solubility in water, easy decomposition, low utilization efficiency, high operating cost, and selectivity, which limits its development to a certain extent. Although ozone can oxidize ma...

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Problems solved by technology

[0003] However, the solubility of ozone in water is low and easy to decompose, the utilization efficiency is low, the operating cost is high, and it has selectivity, which limits its development to a certain extent.

Although ozone can oxidize many refractory organic substances in water, it is not easy to completely decompose organic substances into CO 2 and H 2 O, its products are often small molecular carboxylic acid organic compounds that are difficult to mineralize, and the toxicity of intermediate products may be stronger

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