中文摘要：

本实验以钛酸四丁酯为钛源,醋酸镉为镉源,利用静电纺丝的方法制备了直径~250nm的电纺丝纳米纤维。通过高温煅烧和硫化钠溶液进行水热处理,得到CdS超薄片层包覆TiO2中空结构的纳米纤维。推测该复合结构形貌的形成过程为：在Ti/Cd（摩尔比）为1∶1和2∶1时,由于CdO的含量较高,反应过程中CdO溶解,并与反应溶液中的S2-形成CdS超薄片层生长在纤维的外表面,剩余的TiO2纳米粒子聚集形成中空的纳米管状结构;而Ti/Cd（摩尔比）为4∶1和8∶1时,由于溶解的CdO较少不足以形成TiO2纳米管,同时,生成的CdS也不足以完全包覆TiO2纳米纤维形成非管状结构。当Ti/Cd为1∶1时,TiO2@CdS复合材料具有最好的产氢活性。在300 W氙灯光照条件下和加UVCUT-420nm滤光片下,50mg催化剂产氢速率分别为19.7μmol/h和3.4μmol/h,这主要是由于所得到的复合结构中TiO2为非晶材料。进一步在惰性气氛下煅烧,也很难将TiO2晶化。

英文摘要：

We synthesize the PVP-TBT-Cd（Ac）2 nanofibers with about 250 nm in diameter by electrospinning technology.After calcination in air and hydrothermal treatment in Na2S aqueous solution,TiO2 hollow nanofibers covered with CdS ultrathin nanosheets are formed.The formation process is as follows：the nanofibers are composed of the CdO and TiO2 nanoparticles after calcination.When hydrothermal treatment in Na2S aqueous solution,the CdO nanoparticles are dissolved and formed CdS nanosheets covered TiO2.Due to the dissolution of CdO nanoparticles,the hollow nanofibers composed of TiO2 nanoparticles are formed.The TiO2@CdS nanocomposites have the best H2 production rate when the molar ratio of Ti/Cd is 1/1.The H2 production rate of TiO2@CdS nanocomposites is about 19.7and 3.4μmol/h for 50 mg sample under 300 W Xe lamp without and with a UVCUT-420 nm filter,respectively.