Magnetic Ce/N co-doped TiO2/diatomite composite material photocatalyst and preparation method and application thereof

Abstract

The invention discloses a magnetic Ce/N co-doped TiO2/diatomite composite material photocatalyst, which is based on a preparation process of N-doped composite powder, wherein cerium nitrate hexahydrate is selected as a Ce source, diatomite refined soil is adopted as a carrier, and NiFe2O4 nanoparticles with superparamagnetism are loaded on the surface of the catalyst by a sol-gel method. The doping modification of the rare earth element Ce is introduced into the TiO2, so that the visible light utilization rate of the TiO2/diatomite composite powder and the separation efficiency of photo-generated electron hole pairs are improved, and the composite material shows excellent photocatalytic performance; due to the introduction of the nickel ferrite, the catalyst has magnetism, so that the recovery capacity of the catalyst is improved, and the catalyst has a wide prospect in the application of treating hard-degradation organic pollutants contained in soil in a high-pollution area.

Description

technical field [0001] The invention belongs to the field of photocatalysis, in particular to a magnetic Ce / N co-doped TiO 2 / Diatomite composite material photocatalyst and its preparation method and application. Background technique [0002] In the development of modern agriculture, pesticides and organic fertilizers, as important means of agricultural production, play an important role in the prevention and control of pests and diseases, and in promoting the production of agriculture, forestry, and animal husbandry. However, their large-scale use will cause environmental pollution and change the natural soil. Ecological balance, and even lead to human and animal poisoning accidents, threatening personal safety. Because of its persistent pollution and enrichment of agricultural products, it has become the most influential type of organic pollution in my country. In addition, industrial production, oil extraction, transportation, livestock and poultry breeding, and residen...

AI Technical Summary

Problems solved by technology

However, in practical applications, TiO 2 There are still several problems that need to be solved urgently: (1) the utilization rate of solar energy is low, because the band gap energy is high (3.2eV), it can only be excited by ultraviolet light (accounting for only 5% of sunlight); (2) The quantum efficiency is low, and the photogenerated electron-hole recombination speed is fast; (3) easy to agglomerate, resulting in a decrease in active area and adsorption capacity; (4) small particle size, difficult to separate, recycle and reuse

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