Synthesis and photocatalytic activity of graphene based doped TiO2 nanocomposites
Synthesis and photocatalytic activity of graphene based doped TiO2 nanocomposites
复制标题
石墨烯基掺杂TiO2纳米复合材料的合成及光催化活性
DOI：
10.1016/j.apsusc.2014.04.182
复制
发表时间：
2014-11-15
影响因子：
6.7
通讯作者：
Zhang, Jinlong
中科院分区：
文献类型：
--
作者：
Gu, Yongji;Xing, Mingyang;Zhang, Jinlong
通过氧化石墨烯和TiO 2在水溶剂中的简单水热反应制备了基于还原氧化石墨烯的氮掺杂TiO 2（N-TiO 2-RGO）和基于还原氧化石墨烯的氮和钒共掺杂TiO 2（N，V-TiO 2-RGO）的纳米复合材料。在该水热处理中，氧化石墨烯的还原和氮掺杂的TiO 2（N-TiO 2）或氮和钒共掺杂的TiO 2（N，V-TiO 2）与RGO片之间的紧密接触同时实现。N-TiO_2-RGO和N，V-TiO_2-RGO纳米复合材料的可见光光催化活性明显高于N-TiO_2和N，V-TiO_2，可见光催化活性的顺序为N，V-TiO_2-RGO> N-TiO_2-RGO>N，V-TiO_2> N-TiO_2> TiO_2。根据表征结果，纳米复合材料的光催化活性增强的原因是其对污染物的吸附增强、光吸收强度增强、光生电子和空穴的复合减少以及在可见光照射下纳米复合材料的激发态增多。总体而言，这项工作提供了一个更显着的对比石墨烯基半导体纳米复合材料和更全面的解释机制。(C)2014年爱思唯尔B。版权所有© 2016
The nanocomposites of reduced graphene oxide based nitrogen doped TiO2 (N-TiO2-RGO) and reduced graphene oxide based nitrogen and vanadium co-doped TiO2 (N, V-TiO2-RGO) were prepared via a facile hydrothermal reaction of graphene oxide and TiO2 in a water solvent. In this hydrothermal treatment, the reduction of graphene oxide and the intimate contact between nitrogen doped TiO2 (N-TiO2) or nitrogen and vanadium co-doped TiO2(N, V-TiO2) and the RGO sheet is achieved simultaneously. Both N-TiO2-RGO and N, V-TiO2-RGO nanocomposites exhibit much higher visible light photocatalytic activity than N-TiO2 and N, V-TiO2, and the order of visible light photocatalytic activity is N,V-TiO2-RGO>N-TiO2-RGO>N,V-TiO2>N-TiO2>TiO2. According to the characterization, the enhanced photocatalytic activity of the nanocomposites is attributed to reasons, such as enhancement of adsorption of pollutants, light absorption intensity, minimizing the recombination of photoinduced electrons and holes and more excited states of these nanocomposites under visible light irradiation. Overall, this work provides a more marked contrast of graphene based semiconductor nanocomposites and a more comprehensive explanation of the mechanism. (C) 2014 Elsevier B. V. All rights reserved.