Shi Jian-Wen, Ai Hui-Ying, Chen Jian-Wei, Cui Hao-Jie, Fu Ming-Lai
Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian 361021, China.
Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian 361021, China.
J Colloid Interface Sci. 2014 Sep 15;430:100-7. doi: 10.1016/j.jcis.2014.05.027. Epub 2014 May 23.
Composite photocatalysts composed of nitrogen-doped anatase TiO2 plates with exposed {001} facets (NTS) and graphene nanosheets (G) were firstly synthesized by a facile one-pot hydrothermal process. The morphologies, structural properties, and photocatalytic activities of the resultant NTS/G composites were investigated in detail. Graphene nanosheets were demonstrated play three important roles in the NTS/G composites, as transporter of photo-excited electrons, extender of light absorption range and enhancer of adsorptive capacity, respectively. Due to the effective charge anti-recombination, the efficient utilization of the visible light and the high adsorptive capacity to target pollutants, the composites exhibited significant improvement in photocatalytic degradation of methylene blue under visible light irradiation. Based on the results, the mechanism of enhanced visible-light photocatalytic activity on NTS/G composites was proposed.
首先通过简便的一锅水热法合成了由具有暴露{001}面的氮掺杂锐钛矿型TiO₂板（NTS）和石墨烯纳米片（G）组成的复合光催化剂。详细研究了所得NTS/G复合材料的形貌、结构性质和光催化活性。结果表明，石墨烯纳米片在NTS/G复合材料中分别起到光激发电子的传输体、光吸收范围的扩展剂和吸附能力的增强剂这三个重要作用。由于有效的电荷反复合、可见光的高效利用以及对目标污染物的高吸附能力，该复合材料在可见光照射下对亚甲基蓝的光催化降解表现出显著改善。基于这些结果，提出了NTS/G复合材料增强可见光光催化活性的机理。
