采用密度泛函理论(DFT)研究H2S分子在清洁和羟基化的TiO2-B(100)表面的吸附行为,同时考察表面羟基对H2S吸附的影响.结果表明:H2S分子优先吸附在TiO2-B(100)表面的五配位Ti上(Ti5C).当TiO2-B(100)表面被部分羟基化时,无论端羟基还是桥羟基都对H2S的吸附有增强作用,这是由于表面羟基与H2S之间形成了氢键;当TiO2-B(100)表面完全被羟基覆盖时,H2S的吸附会受到削弱.
The adsorption of H2S on the clean and hydroxylated TiO2-B (100) surfaces was investigated by density functional theory (DFF) method.The influences of the surface hydroxyl groups were considered.Results showed that H2S preferentially adsorbed at the Ti5C site on the TiO2-B(100) surface.When the TiO2-B(100) surface was partially hydroxylated,both the terminal and the bridging hydroxyl groups enhanced the adsorption of H2S,due to the formation of hydrogen bonding between H2S and the hydroxyl group.However,on the fully hydroxylated TiO2-B(100) surface,the adsorption of H2S was weakened.