Carbon-nanodot-coverage-dependent photocatalytic performance of carbon nanodot/TiO2 nanocomposites under visible light
Carbon-nanodot-coverage-dependent photocatalytic performance of carbon nanodot/TiO2 nanocomposites under visible light
复制标题
可见光下碳纳米点/TiO2纳米复合材料的碳纳米点覆盖依赖性光催化性能
DOI：
10.1088/1674-1056/26/5/058101
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Bing Zhang
中科院分区：
文献类型：
--
作者：
Mingye Sun;Youjin Zheng;Lei Zhang;Liping Zhao;Bing Zhang
将具有可见光吸收带的碳纳米点（CD）与TiO 2集成，以增强TiO 2的光敏性。CD/TiO 2纳米复合材料表现出明显的CD覆盖度依赖的光催化性能。在可见光照射下，CD/TiO 2纳米复合材料具有最高的光催化活性，且CD/TiO 2纳米复合材料的光催化活性优于TiO 2纳米复合材料。过小的CD覆盖会导致可见光吸收差，这限制了CD/TiO 2纳米复合材料的光催化性能。CD包覆量过大会抑制CD/TiO 2纳米复合材料的光催化活性，从而抑制CD对TiO 2的电子转移过程，抑制CD/TiO 2纳米复合材料的光催化活性。这些结果表明，合理调节CD的覆盖率，实现高效的ET过程是优化CD/TiO 2纳米复合材料光催化性能的重要手段。
Carbon nanodots (CDs) with visible absorption band and TiO2 are integrated to enhance the photosensitivity of TiO2. The CD/TiO2 nanocomposites show obvious CD-coverage-dependent photocatalytic performance. The CD/TiO2 nanocomposites with moderate CD coverge exhibit the highest photocatalytic activity after being irradiated with visible light, which is more excellent than that of TiO2. Too little CD coverage could result in poor visible light absorption, which limits the photocatalytic performance of CD/TiO2 nanocomposites. While, too much CD coverage weakens the photocatalytic activity of CD/TiO2 nanocomposites by restraining the extraction of conduction band electrons within TiO2 to generate active oxygen radicals and the electron transfer (ET) process from CDs to TiO2. These results indicate that rational regulation of CD coverage and the realization of efficient ET process are important means to optimize the photocatalytic performance of CD/TiO2 nanocomposites.