Hierarchically Ordered Macro-Mesoporous TiO2-Graphene Composite Films: Improved Mass Transfer, Reduced Charge Recombination, and Their Enhanced Photocatalytic Activities
Hierarchically Ordered Macro-Mesoporous TiO2-Graphene Composite Films: Improved Mass Transfer, Reduced Charge Recombination, and Their Enhanced Photocatalytic Activities
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分级有序的宏观介孔TiO2-石墨烯复合薄膜：改善传质、减少电荷复合及其增强的光催化活性
DOI：
10.1021/nn102767d
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发表时间：
2011-01-01
期刊：
影响因子：
17.1
通讯作者：
Jiang, Lei
中科院分区：
文献类型：
--
作者：
Du, Jiang;Lai, Xiaoyong;Jiang, Lei
通过限制自组装方法在具有三维周期性的胶体晶体的规则空隙中制备了分级有序的大-介孔二氧化钛薄膜。此外，通过原位还原自组装体系中添加的氧化石墨烯，石墨烯作为优异的电子接受和电子传输材料已被纳入分级有序的大孔-介孔二氧化钛框架中。在介孔膜中引入互连的大孔改善了通过膜的质量传输，减少了介孔通道的长度，并增加了薄膜的可及表面积，而石墨烯的引入有效地抑制了电荷复合。因此，实现了光催化降解甲基蓝的活性的显著增强。无石墨烯和有石墨烯的大-介孔二氧化钛膜的表观速率常数分别高达0.045和0.071 min（-1），几乎是纯介孔二氧化钛膜（0.0041 min（-1））的11和17倍。
Hierarchically ordered macro-mesoporous titania films have been produced through a confinement self assembly method within the regular voids of a colloidal crystal with three-dimensional periodicity. Furthermore, graphene as in excellent electron-accepting and electron transporting material has been incorporated into the hierarchically ordered macro-mesoporous titania frameworks by in situ reduction of graphene oxide added in the self assembly system. Incorporation of interconnected macropores in mesoporous films improves the mass transport through the film reduces the length of the mesopore channel, and increases the accessible surface area of the thin film, whereas the introduction of graphene effectively suppresses the charge recombination. Therefore; the significant enhancement of photocatalytic activity for degrading the methyl blue has been achieved. The apparent rate constants for macro-mesoporous titania films without and with graphene are up to 0.045 and 0.071 min(-1), respectively, almost 11 and 17 times higher than that for Pure mesoporous titania films (0.0041 min(-1)).