State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, P. R. China.
Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, P. R. China.
Chem Asian J. 2018 Nov 2;13(21):3261-3267. doi: 10.1002/asia.201801103. Epub 2018 Oct 9.
The photocatalytic activity of g-C N is limited by the low surface area and the fast recombination of photogenerated charges. In this work, a g-C N quantum dot (CNQDs) modified g-C N inverse opal (CN IO) metal-free composite (CNQDs/CN IO) was successfully synthesized by a simple calcination method. CNQDs/CN IO exhibited outstanding photocatalytic activity in the removal of organic pollutants represented by phenol, which can be ascribed to (i) the inverse opal structure that enhances the light harvesting, facilitates mass transfer, and provides adequate surface area for photocatalytic reactions; (ii) the incorporation of CNQDs in the framework of g-C N promotes photogenerated charge separation and transfer across the interfaces between CN IO and CNQDs, leading to excellent photoelectrochemical properties. The strategy of self-modification of g-C N with special structures provides a rational design idea to fabricate highly efficient metal-free photocatalysts.
g-C3N 的光催化活性受到低比表面积和光生载流子快速复合的限制。在这项工作中，通过一种简单的煅烧方法成功合成了 g-C3N 量子点（CNQDs）修饰的 g-C3N 反蛋白石（CN IO）无金属复合材料（CNQDs/CN IO）。CNQDs/CN IO 在去除以苯酚为代表的有机污染物方面表现出优异的光催化活性，这可归因于：（i）反蛋白石结构增强了光捕获、促进了质量传递并为光催化反应提供了足够的表面积；（ii）CNQDs 掺入 g-C3N 的框架中促进了光生载流子在 CN IO 和 CNQDs 之间的界面处的分离和转移，从而表现出优异的光电化学性能。用特殊结构对 g-C3N 进行自修饰的策略为制备高效无金属光催化剂提供了合理的设计思路。
