中文摘要：

首先采用相分离的水解-溶剂热法制备了Bi2O3纳米粒子,然后利用简单的湿化学法在Bi2O3表面负载不同比例的TiO2纳米颗粒,进而得到TiO2/Bi2O3纳米复合体。通过气氛调控的表面光电压谱（SPS）等测试表明,表面负载适量的TiO2后能够提高Bi2O3光生电荷分离。可见光催化产氢和降解污染物测试结果进一步证明,表面负载适量的TiO2后可显著提高其可见光催化活性,其中Ti/Bi摩尔比为7%时具有最高的光催化活性。这主要归因于TiO2具有较为合适的导带能级位置,可以接收Bi2O3在可见光激发下所产生的高能级电子,从而抑制光生电子-空穴对复合,并且维持了高能级电子较高的还原能力。

英文摘要：

Bi2O3 nanoparticles were prepared by one-pot water-organic two-phase separated hydrolysissolvothermal,and then TiO2 nanoparticles with different molar ratio were loaded on the surface of Bi2O3 with facile wet chemical method to prepare TiO2/Bi2O3 nanocomposites.The result of atmosphere controlled surface photovoltage spectrum（SPS）show that Bi2O3 loaded with suitable TiO2 could improve the photoinduced charge separation.Both of visible light driven photocatalytic H2 production and degradation of organic pollution efficiency of Bi2O3 after loaded with TiO2 promoted significantly,that sample of 7T-B possess of the highest photocatalytic H2 production efficiency.This may be attributed to the suitable conduction band of TiO2 which could accept the high energy photoinduced electrons from Bi2O3 so that inhibit the recombination of photogenerate electron-hole pairs and maintain the high reduction of the high energy electrons.