AgBr/TiO2（001）纳米片可见光光催化剂的制备

以暴露高能面（001）面的TiO2纳米片为载体,NaBr和CTAB分别为溴源,通过浸渍-沉积法合成AgBr/TiO2（001）纳米片复合可见光催化剂。采用X射线衍射（XRD）、透射电镜（TEM）、X射线光电子能谱（XPS）、紫外-可见光谱（UV-Vis）等手段对其进行了表征。在可见光（λ〉420nm）的辐照下,通过降解甲基橙来评价合成样品的可见光催化性能,探讨AgNO3的用量、不同溴源和F-在TiO2纳米片表面残留对催化性能的影响。结果表明,以NaBr为溴源制备Ag/AgBr@TiO2复合催化材料,当AgNO3添加量为0.313 5g时,其综合效果最优;而以CTAB为溴源制备的样品其催化活性明显高于以NaBr为溴源制备的样品;TiO2纳米片表面残留F-离子对活性略有影响。

The Preparation and Performance of AgBr/TiO2（001）Nanosheet Photocatalysts with Visible-light Photocatalytic Activity

AgBr@TiO2catalysts were synthesized using an impregnation-precipitation method with NaBr or CTAB as bromine sources and TiO2（001）nanosheets as supports.The synthesized samples were characterized by XRD,TEM,XPS and UV -Vis.The photocatalytic activity of AgBr/TiO2was evaluated by degradation of methyl orange（MO）solution under visible-light irradiation（λ420nm）.Also,the influence of the different bromine sources,the adding amount of AgNO3and residual F-on the photocatalytic performance were investigated.The results show that the optimum AgNO3adding amount for the AgBr@ TiO2catalyst with NaBr as the bromine source is 0.3135g,while the photocatalysts using CTAB as the bromine source exhibits higher catalytic activity than those using NaBr as the bromine source.The residual of F slightly affects the photocatalytic activtiy.