Catalytic purification composite material and preparation method and application thereof

Abstract

The invention provides a catalytic purification composite material and a preparation method and application thereof. Activated carbon loaded manganese sand particles are used as a basic framework of the material, and mixed metal oxides as active components are loaded on the outermost layer of the framework. The preparation method of the material comprises the following steps: pretreating manganese sand and removing impurities on the surface of the manganese sand; taking wooden activated carbon or shell activated carbon as an activated carbon precursor; roasting in an inert atmosphere; preparing a porous carbon structure which uses the manganese sand as a framework; and modifying the surface of the manganese sand-porous carbon structure by using the metal oxides to form the novel composite purification material with adsorption and electro-catalyst composite functions. When the catalytic purification composite material is used, the composite material effectively adsorbs and catches low-concentration organic matters in micro-polluted raw water at first, so that pollutants are adsorbed on the surface of the material, then the composite material with adsorption saturation is guided into an electrolytic bath for electrochemical oxidation, the pollutants on the surface of the composite material are desorbed and decomposed, and are thoroughly mineralized into carbon dioxide and water, and meanwhile, recycling of the composite material is realized.

Description

[0001] Technical field: [0002] The invention relates to a catalytic purification composite material and its preparation method and application, belonging to the field of environmental protection engineering. [0003] Background technique: [0004] The state vigorously promotes and plans chemical parks to strengthen the centralized management and treatment of chemical industry wastewater. However, due to the wide variety of wastewater in the chemical industry, the large differences in the nature of pollutants, and the asynchronous removal levels, the total drainage of most industrial parks is facing huge pressure to meet the standards, especially the increasingly stringent discharge standards that will be implemented (such as the petrochemical industry The total effluent COD will reach the emission standard of 40mg / L), and some special pollutants can cause serious damage to the ecological environment due to their low concentration, and are difficult to degrade and have poor bi...

AI Technical Summary

Problems solved by technology

However, the traditional adsorption technology is mainly based on the fixed bed of granular activated carbon, which has problems such as low catalytic activity, low adsorption efficiency, large bed pressure drop, and long adsorption time.

In traditional technology, when manganese sand is used alone as a catalyst to treat wastewater, its treatment effect is greatly affected by the pH of the water body.

However, the use efficiency of granular activated carbon is low, the regeneration effect is poor, and the degradation of pollutants is not complete. The direct discharge of granular activated carbon after use will cause waste of resources, and even as a component of hazardous waste, it will have a certain negative impact on the ecological environment.

[0005] In the application process of traditional adsorption catalysts, there are many defects such as low catalytic efficiency, long catalytic time, short service life of catalysts, and incomplete catalytic degradation of low-concentration pollutants in water, resulting in unstable effluent quality. Such problems need to be solved urgently