氧化铋光催化剂的改性方法

Bi2O3 is nontoxic, cheap, and has the property of absorbing visible light. So, it has good prospects for application. There are four common crystal types of Bi2O3, namely α-Bi2O3, β-Bi2O3, γ-Bi2O3 and δ-Bi2O3. In recent years, people has pay much attention on the preparation and modification of Bi2O3, improving the photocatalytic performance of Bi2O3 effectively. The favorable change can be attributed to the reduction of the band gap, the reduced recombination rate of photogenerated electron-hole pairs, or the increase of the specific surface area and so on. The structure and properties of Bi2O3 are analyzed briefly. The mechanisms of improving the catalytic activity of Bi2O3 by different modification methods are summarized, and the main problems are put forward.