Luo Bifu, Chen Min, Zhang Zhengyuan, Xu Jie, Li Di, Xu Dongbo, Shi Weidong
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, P. R. China.
Dalton Trans. 2017 Jul 4;46(26):8431-8438. doi: 10.1039/c7dt01250k.
Spatial separation of photogenerated electron-hole pairs is one of the most important factors that determine the efficiency of a photocatalyst. It is well acknowledged that the fabrication of heterogeneous photocatalysts with two different inorganic semiconductors is a good strategy to effectively improve the charge separation of electrons and holes. This study describes a novel visible light-induced g-CN/BiTaO composite photocatalyst with superior photocatalytic properties toward the degradation of tetracycline (TC) by visible light irradiation. The formation of heterojunctions significantly improves the separation efficiency of photogenerated carriers, which is confirmed by the photocurrent density and electrochemical impedance spectroscopy. Electron spin resonance examination and trapping experiments confirm that the photoinduced active species (˙OH and ˙O) are responsible for the degradation of tetracycline. Based on the experimental results, a possible Z-scheme system reaction mechanism for the g-CN/BiTaO composite towards the degradation of TC under visible light was proposed.
光生电子-空穴对的空间分离是决定光催化剂效率的最重要因素之一。众所周知，用两种不同的无机半导体制造异质结光催化剂是有效提高电子和空穴电荷分离的良好策略。本研究描述了一种新型可见光诱导的g-CN/BiTaO复合光催化剂，该催化剂在可见光照射下对四环素（TC）的降解具有优异的光催化性能。异质结的形成显著提高了光生载流子的分离效率，这通过光电流密度和电化学阻抗谱得到证实。电子自旋共振检测和捕获实验证实，光诱导活性物种（˙OH和˙O）是四环素降解的原因。基于实验结果，提出了g-CN/BiTaO复合材料在可见光下对TC降解的可能的Z型体系反应机理。
