Cheng Chunyu, Liang Qinghua, Yan Ming, Liu Zhifeng, He Qingyun, Wu Ting, Luo Songhao, Pan Yuan, Zhao Chenhui, Liu Yang
College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
J Hazard Mater. 2022 Feb 15;424(Pt D):127721. doi: 10.1016/j.jhazmat.2021.127721. Epub 2021 Nov 21.
Due to the low efficiency of single-component nano materials, there are more and more studies on high-efficiency composites. As zero dimensional (0D) non-metallic semiconductor material, the emergence of graphene quantum dots (GQDs) overcomes the shortcomings of traditional photocatalysts (rapid rate of electron-hole recombination and narrow range of optical response). Their uniqueness is that they can combine the advantages of quantum dots (rich functional groups at edge) and sp carbon materials (large specific surface area). The inherent inert carbon stabilizes chemical and physical properties, and brings new breakthroughs to the development of benchmark photocatalysts. The photocatalytic efficiency of GQDs composite with semiconductor materials (SCs) can be improved by the following three points: (1) accelerating charge transfer, (2) extending light absorption range, (3) increasing active sites. The methods of preparation (bottom-up and top-down), types of heterojunctions, mechanisms of photocatalysis, and applications of GQDs/SCs (wastewater treatment, energy storage, gas sensing, UV detection, antibiosis and biomedicine) are comprehensively discussed. And it is hoped that this review can provide some guidance for the future research on of GQDs/SCs on photocatalysis.
由于单一组分纳米材料效率较低，对高效复合材料的研究越来越多。作为零维（0D）非金属半导体材料，石墨烯量子点（GQDs）的出现克服了传统光催化剂的缺点（电子 - 空穴复合速率快和光学响应范围窄）。它们的独特之处在于能够结合量子点（边缘丰富的官能团）和sp碳材料（大比表面积）的优点。固有的惰性碳稳定了化学和物理性质，并为基准光催化剂的发展带来了新的突破。GQDs与半导体材料（SCs）复合的光催化效率可通过以下三点提高：（1）加速电荷转移，（2）扩展光吸收范围，（3）增加活性位点。本文全面讨论了GQDs/SCs的制备方法（自下而上和自上而下）、异质结类型、光催化机理以及应用（废水处理、能量存储、气体传感、紫外线检测、抗菌和生物医学）。希望这篇综述能为未来GQDs/SCs光催化研究提供一些指导。
