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

Abstract

The invention discloses a supported gallium-tin photocatalyst. The photocatalyst is a photocatalysis material prepared by taking an MCM mesoporous molecular sieve as a carrier and loading two active components including SnO2 and GaO2. The photocatalyst prepared by the method disclosed by the invention has a large specific surface area and takes the MCM mesoporous molecular sieve with a certain pore channel structure as the carrier; Sn and Ga double-metal oxide is loaded into the pore channel structure in the MCM mesoporous molecular sieve, so that the contact area between active sites of the active components and a pollutant is extremely enlarged; Ga with a greater forbidden bandwidth is selected and used as the main active component; meanwhile, Sn which has relatively great energy level difference with a Ga conduction band is used as an auxiliary active component, so that the self-made photocatalyst has stronger photocatalysis 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