Mesocrystalline Ti3+TiO2 hybridized g-C3N4 for efficient visible-light photocatalysis
Mesocrystalline Ti3+TiO2 hybridized g-C3N4 for efficient visible-light photocatalysis
复制标题
DOI：
10.1016/j.carbon.2017.11.078
复制
发表时间：
2018-03
期刊：
影响因子：
10.9
通讯作者：
Xin Yu;Xiaoli Fan;Li An;Guangbo Liu;Zhonghua Li;Jiawen Liu;P. Hu
中科院分区：
文献类型：
--
作者：
Xin Yu;Xiaoli Fan;Li An;Guangbo Liu;Zhonghua Li;Jiawen Liu;P. Hu
TiO 2介晶由于其长寿命的载流子和有效的导电途径而被认为是一种迷人的高效光催化剂。然而，TiO 2介晶没有可见光响应和可见光光催化活性。为了克服这些不足，介晶Ti 3+单键TiO 2（meso-TiO 2）及其复合材料具有很强的可见光捕获和光催化制氢能力。本工作采用定向附着法成功制备了Ti 3+掺杂的TiO 2介晶，并采用简单的溶剂热法制备了直接Z型Ti 3+自掺杂的TiO 2介晶/g-C3 N4复合材料。所制备的Ti 3+单键TiO 2介晶具有可见光吸收和光催化制氢活性。有趣的是，所制备的Ti 3+掺杂的meso-TiO 2/g-C3 N4复合材料表现出显著改善的可见光吸收和可见光光催化产氢活性，在400 nm处的最高光催化产氢活性为3748.46 μmol g-1h-1，表观量子效率为1.42（牺牲剂，三乙醇胺）和983.56 μmol g−1h−1（牺牲剂，甲醇），远高于g-C3 N4和Ti 3+掺杂的TiO 2介晶，主要是由于高的电荷分离效率、长寿命载流子和有效的输运途径。最后，对Ti 3+掺杂的meso-TiO 2/g-C3 N4复合材料的直接Z型光催化机理进行了详细的探讨。
TiO2mesocrystals are often considered to be a fascinating and efficient photocatalyst because of its long lifetime carriers and effective conduction pathways. However, TiO2mesocrystals showed no visible light response and visible light photocatalytic activity. To overcome these shortages, mesocrystalline Ti3+single bondTiO2(meso-TiO2) and its composites are highly desired to have strong capacity for harvesting visible light and photocatalytic hydrogen production. In this work, Ti3+doped TiO2mesocrystals were successfully prepared through oriented attachment mechanisms, and direct Z-scheme Ti3+self-doped TiO2mesocrystals/g-C3N4composites were also prepared by facile solvethermal method. The as-prepared Ti3+single bondTiO2mesocrystals showed visible light absorption and photocatalytic activity for hydrogen production. Interestingly, the as-prepared Ti3+doped meso-TiO2/g-C3N4composites displayed highly improved visible light absorption and visible light photocatalytic activity for hydrogen production, and the highest photocatalytic activity for hydrogen production was about 3748.46 μmol g−1h−1with an apparent quantum efficiency of 1.42% at 400 nm (sacrificial agent, triethanolamine) and 983.56 μmol g−1h−1(sacrificial agent, methanol), much higher than that of g-C3N4and Ti3+doped TiO2mesocrystals, mainly due to the high charge separation efficiency, long lifetime carriers and effective transport pathways. Finally, possible direct Z-scheme photocatalytic mechanism of Ti3+doped meso-TiO2/g-C3N4composites were proposed in detail.