Preparation method and application of surfactant-modified metallic oxide catalyst

Abstract

The invention discloses a preparation method and application of a surfactant-modified metallic oxide catalyst. The preparation method comprises the steps of uniformly grinding three solid matters, i.e., metal salt, sodium hydroxide and a surfactant respectively, uniformly mixing and grinding, drying a mixture, cooling to the room temperature, grinding into powder, calcining, cooling to the room temperature, and obtaining the surfactant-modified metallic oxide catalyst. According to the preparation method, a soft template effect and a stabilized dispersion effect of the surfactant can be fullyutilized, so that the size and the surface energy of catalyst particles as well as the dispersibility of the catalyst particles in different media can be effectively regulated, and the catalytic activity of the catalyst for ozonizing low-ammonia-nitrogen wastewater as well as the efficiency of the catalyst for selectively converting the ammonia nitrogen into N2 are further improved; through applying the surfactant-modified metallic oxide catalyst, the low-ammonia-nitrogen wastewater can be catalyzed and ozonized at normal temperature and normal pressure, and meanwhile, the ammonia nitrogen ismore efficiently and selectively converted into the N2.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, and in particular relates to a preparation method and application of a surfactant-modified metal oxide catalyst. Background technique [0002] At present, the commonly used treatment methods for low ammonia nitrogen wastewater in industrial wastewater mainly include ion exchange method, break point chlorination method, biological method, etc. These methods have their own characteristics, but they also have certain defects. Among them, the ion exchange method has the disadvantages of small adsorption capacity and frequent regeneration; the breakpoint chlorination method has high treatment costs, and the by-products of chloramine and chlorinated organic matter will cause secondary pollution; the nitrification product of the biological method NO 3 — to be converted to N by anaerobic organisms 2 , and in the presence of components such as salt and heavy metals, the activity of microor...

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Problems solved by technology

Among them, the ion exchange method has the disadvantages of small adsorption capacity and frequent regeneration; the breakpoint chlorination method has high treatment costs, and the by-products of chloramine and chlorinated organic matter will cause secondary pollution; the nitrification product of the biological method NO 3 — to be converted to N by anaerobic organisms 2 , and in the presence of components such as salt and heavy metals, the activity of microorganisms will be inhibited. In addition, the biological method also has shortcomings such as the need to strictly control pH, nutrient sources, and wastewater temperature.

[0003] In addition, there is a wet catalytic oxidation method for the treatment of low ammonia nitrogen wastewater, but this method requires relatively harsh reaction conditions, such as high temperature and high pressure, and even requires the use of noble metals as catalysts for catalytic reactions

However, if it is oxidized by heterogeneous catalytic ozone, it can realize the advantages of simple operation, easy separation of the catalyst, repeatable regeneration, and no secondary pollution. , ammonia nitrogen is converted to N 2 The efficiency is not high, and there are no related reports, documents and patents on ozonation of low-ammonia-nitrogen wastewater by using a non-noble metal as a catalyst under normal temperature and pressure.

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