Method for efficiently removing organic pollutants in wastewater by combining visible light catalyst-ClO2 oxidation

Abstract

The invention relates to a method for efficiently removing organic pollutants in wastewater by combining visible light catalyst-ClO2 oxidation. The which comprises the following steps of: (1) regulating the pH value of wastewater containing organic matters to a constant pH value, adding a visible light response catalyst, putting an obtained mixture in a dark place, and performing sufficient stirring and adsorbing until adsorption equilibrium is reached; and (2) turning on a xenon lamp light source, adjusting the distance between the light source and the liquid level, adding chlorate into a system, keeping the reaction temperature constant, and performing fully stirring to degrade the organic pollutants. According to the method, the organic pollutants in the wastewater are removed by adopting the visible light catalyst-ClO2 oxidation combined process; an active substance generated in a photocatalysis process is used as an oxidizing agent, the active substance and chlorate-containing acid radicals are subjected to electron transfer, so that chlorine-containing active substances such as ClO2 and the like are generated, and such that the organic pollutants can be continuously subjectedto oxidative degradation, oxidation ability is strong, lasting time is long, the problems of short service life, short mass transfer distance and the like of photo-produced active substances during aphotocatalysis process are avoided, and the degradation rate of the pollutants is effectively improved.

Description

technical field [0001] The invention relates to a visible light catalysis-ClO 2 The invention relates to a method for efficiently removing organic pollutants in wastewater by combined oxidation, which belongs to the chemical and environmental technical field of organic wastewater treatment. Background technique [0002] With the improvement of the level of industrial development and the improvement of production and living conditions, organic wastewater has increasingly become a potential threat to ecological security and human health. At present, in addition to traditional wastewater treatment technologies such as adsorption, coagulation and membrane filtration, photocatalysis, ClO 2 The application of oxidation and other advanced oxidation technologies to the degradation of organic pollutants has gradually become a research hotspot. Photocatalytic oxidation technology mostly uses semiconductors as catalysts and sunlight as the driving energy to generate oxidative active ...

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of existing photocatalytic technology, such as low photon utilization rate and short lifetime of active materials, ClO 2 Due to the shortcomings of oxidation technology, such as complex process, cumbersome operation, high energy consumption and difficulty in eliminating inorganic disinfection by-products, it is urgent to propose a green, efficient, energy-saving and environmentally friendly new technology for organic wastewater treatment

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