Chromium oxide loaded titanium dioxide photocatalyst as well as preparation method and application thereof

Abstract

The invention provides a preparation method of a chromium oxide loaded titanium dioxide photocatalyst with an excellent carbon dioxide reduction performance. The preparation method comprises the following steps: preparing titanium dioxide nano sheets by a hydrothermal method; dispersing the titanium dioxide nano sheets in water to obtain a titanium dioxide suspension; mixing a potassium chromate water solution with the titanium dioxide suspension, carrying out ultrasonic dispersion to obtain a chromium precursor solution; carrying out visible light deposition on the chromium precursor solution, and cleaning, freezing and drying to obtain the chromium oxide loaded titanium dioxide photocatalyst after the light deposition is finished. According to the preparation method, a main catalyst namely anatase type titanium dioxide nano sheets is prepared through a classical hydrothermal method, and then the chromium oxide co-catalyst loaded titanium dioxide photocatalyst is prepared through a visible light deposition method. The rate of generating methane by photocatalytic reduction of carbon dioxide is 0.42 [mu]mol h<-1>, and the selectivity of methane is up to 98%. The synthesis method issimple and is beneficial to popularization and application in industrial production.

Description

technical field [0001] The invention relates to the technical field of catalyst materials, in particular to a titanium dioxide photocatalyst supported by chromium oxide, its preparation method and application. Background technique [0002] The two major problems of energy crisis and environmental pollution that society faces today have seriously restricted the development of human society. On the one hand, the continuous development of society has led to an increasing demand for energy by human beings. However, fossil fuels such as coal, oil, and natural gas have limited and non-renewable reserves and will eventually be exhausted. On the other hand, the combustion of traditional fossil fuels inevitably causes a series of environmental problems. For example, the emission of greenhouse gases such as carbon dioxide intensifies the greenhouse effect; sulfur dioxide, nitrogen dioxide, and inhalable particulate matter cause acid rain, photochemical smog, etc., which in turn pose ...

AI Technical Summary

Problems solved by technology

Titanium dioxide (TiO2) is one of the most widely studied photocatalysts, but due to its severe carrier recombination and its response to ultraviolet light, which accounts for less than 5% of the solar spectrum, pure TiO The energy conversion efficiency of 2 is low

However, the above-mentioned core-shell structure needs to precisely control the ratio of chromium oxide to noble metal, and the loading process is relatively complicated, which increases the difficulty and cost of its industrial application.

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