A kind of supported gallium-tin photocatalyst and preparation method thereof

Abstract

The invention discloses a supported gallium-tin photocatalyst. The photocatalyst uses MCM mesoporous molecular sieve as a carrier and supports SnO. 2 of and GaO 2 A photocatalytic material with two active components. The photocatalyst prepared by the method of the present invention uses MCM mesoporous molecular sieve with a large specific surface area and a certain pore structure as a carrier, and loads Sn and Ga bimetallic oxides into the internal pore structure of the MCM mesoporous molecular sieve, which greatly increases the activity. The contact area between the active site of the component and the contaminants; Ga, which has a larger band gap, is selected as the main active component, and Sn, which has a large conduction band energy level difference with Ga, is used as an auxiliary active component, making the self-made Photocatalysts have stronger catalytic efficiency.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, and in particular relates to a supported gallium-tin photocatalyst and a preparation method thereof. Background technique [0002] Photocatalytic technology can effectively degrade some refractory organic substances, and its technical feature is that it can deeply degrade refractory organic substances under mild conditions. Titanium dioxide TiO 2 As a commonly used photocatalytic material, it has been extensively studied. gallium oxide Ga 2 o 3 As a wide bandgap semiconductor material, the bandgap width is between 4.2-4.9eV, which is larger than that of TiO 2 3.2eV, from the energy band structure of the semiconductor, Ga 2 o 3 The photocatalytic oxidation / reduction ability is better than that of TiO 2 . with TiO 2 Similarly, under light conditions, Ga 2 o 3 The electron-hole is excited, and the hole has strong oxidizing properties, which can directly oxidize organic matter or re...

AI Technical Summary

Problems solved by technology

[0004] The above method improves the catalytic activity of gallium oxide by loading noble metals, but noble metals are expensive and difficult to popularize and use, and there is a problem that the surface of noble metals is easy to deposit carbon, which leads to the reduction of catalyst activity; it directly uses commercial gallium oxide as a carrier to load noble metals, and the prepared catalyst ratio Smaller surface area, less active sites, poor adsorption performance, poor overall catalytic activity