Wang Peng, Cai Wanqian, Yu Fangyuan, Zhou Ping, Lin Mei, Lin Cong, Lin Tengfei, Gao Min, Zhao Chunlin, Li Xiangqi, Wu Xiao
College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China.
College of Environment Science and Engineering, Fujian Normal University, Fuzhou, 350007, Fujian Province, China.
Chemosphere. 2023 Oct;338:139548. doi: 10.1016/j.chemosphere.2023.139548. Epub 2023 Jul 17.
The decaying photocatalytic rate caused by carrier recombination is a thorny problem that has not been properly solved. Improvement of photocatalysis can be achieved through structural innovation, diversification of catalytic modes, or a combination of both. Herein, effective separation of photo-generated carriers in BiNaTiO/ZnO composites was achieved by heterojunction construction for energy band regulation and synchronously mechanical energy harvesting from piezoelectric effect. The formation of heterojunctions between BiNaTiO and ZnO was confirmed by electron microscopy and analysis of X-ray photoelectron spectroscopy spectra. The degradation performance of Rhodamine B, a representative industrial dye contaminant, was optimized through the formation of BiNaTiO/ZnO heterojunctions and ultrasonic vibration harvesting. Their band structures were described in detail and electrochemical tests were performed to substantiate a novel Z-scheme heterostructure that can explain the carrier separation and transfer processes in catalysis. The piezoelectric polarization field generated by the piezoelectric effect of both BiNaTiO and ZnO coordinates perfectly with the photocatalysis, enabling the piezo-photocatalysis. Our research opens a promising avenue in alleviating charge carrier complexation through heterojunction construction and mechanical strain for future pollutants degradation via catalysis.
由载流子复合导致的光催化速率衰减是一个尚未得到妥善解决的棘手问题。可以通过结构创新、催化模式多样化或两者结合来实现光催化性能的提升。在此，通过构建异质结以调节能带，并利用压电效应同步收集机械能，实现了BiNaTiO/ZnO复合材料中光生载流子的有效分离。通过电子显微镜和X射线光电子能谱分析证实了BiNaTiO与ZnO之间异质结的形成。通过形成BiNaTiO/ZnO异质结和超声振动收集，优化了典型工业染料污染物罗丹明B的降解性能。详细描述了它们的能带结构，并进行了电化学测试，以证实一种新型的Z型异质结构，该结构可以解释催化过程中的载流子分离和转移过程。BiNaTiO和ZnO的压电效应产生的压电极化场与光催化完美配合，实现了压电光催化。我们的研究为通过构建异质结和机械应变来缓解电荷载流子复合，从而在未来通过催化降解污染物开辟了一条有前景的途径。
