Li Jianing, Wang Junzhong, Liu Juming, Li Yan, Ma Huiyan, Yang Jucai, Zhang Qiancheng
Inner Mongolia Key Laboratory of Theoretical and Computational Chemistry Simulation, Inner Mongolia University of Technology Hohhot 010051 China
School of Chemical Engineering, Inner Mongolia University of Technology Hohhot 010051 China.
RSC Adv. 2020 Nov 27;10(70):43193-43203. doi: 10.1039/d0ra08894c. eCollection 2020 Nov 23.
Nano-TiO is a type of environment-friendly and inexpensive substance that could be used for photocatalytic degradation processes. In this study, the multi-type carbon species doped and modified anatase nano-TiO was innovatively synthesized and developed to overcome the deficiency of common nano-TiO photocatalysts. The multi-type carbon species were derived from tetrabutyl titanate and ethanol as the internal and external carbon sources, respectively. Meanwhile, diverse characterization methods were applied to investigate the morphology and surface properties of the photocatalyst. Finally, the visible-light photocatalytic degradation activity of the collected samples was evaluated by using methyl orange as a model pollutant. The promotion mechanism of multi-type carbon species in the photocatalytic process was also discussed and reported. The results in this work show that the doping and modification of multi-type carbon species successfully narrows the bandgap of nano-TiO to expand the light absorption range, reduces the valence band position to improve the oxidation ability of photogenerated holes, and promotes the separation of photogenerated charge carriers to improve quantum efficiency. In addition, the further modification of the external carbon source can promote the surface adsorption of MO and stabilize the multi-type carbon species on the surface of nano-TiO.
纳米二氧化钛是一种环保且廉价的物质，可用于光催化降解过程。在本研究中，创新性地合成并开发了多类型碳物种掺杂和改性的锐钛矿型纳米二氧化钛，以克服普通纳米二氧化钛光催化剂的不足。多类型碳物种分别源自钛酸四丁酯和乙醇，作为内部和外部碳源。同时，应用多种表征方法研究光催化剂的形态和表面性质。最后，以甲基橙作为模型污染物，评估所收集样品的可见光光催化降解活性。还讨论并报道了多类型碳物种在光催化过程中的促进机制。本工作的结果表明，多类型碳物种的掺杂和改性成功地缩小了纳米二氧化钛的带隙以扩大光吸收范围，降低了价带位置以提高光生空穴的氧化能力，并促进了光生电荷载流子的分离以提高量子效率。此外，外部碳源的进一步改性可以促进甲基橙的表面吸附，并使多类型碳物种稳定在纳米二氧化钛表面。
