State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
ACS Nano. 2011 Jan 25;5(1):590-6. doi: 10.1021/nn102767d. Epub 2010 Dec 28.
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 an 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)).
具有分级有序的介观-大孔氧化钛薄膜是通过在具有三维周期性的胶体晶体的规则空隙内进行限制自组装的方法制备的。此外，通过原位还原加入自组装体系中的氧化石墨烯，将石墨烯作为一种优异的电子接受体和电子传输材料掺入分级有序的介观-大孔氧化钛骨架中。介孔薄膜中相互连通的大孔的掺入可以改善通过薄膜的质量传输，减小介孔通道的长度，并增加薄膜的可及表面积，而石墨烯的引入则有效地抑制了电荷复合。因此，实现了对亚甲基蓝的光催化降解活性的显著增强。无石墨烯和有石墨烯的介观-大孔氧化钛薄膜的表观速率常数分别高达 0.045 和 0.071 min(-1)，比纯介观氧化钛薄膜（0.0041 min(-1)）分别提高了近 11 倍和 17 倍。
