Tong Haijuan, Shi Bingfang, Zhao Shulin
Key Laboratory of Regional Ecological Environment Analysis and Pollution Control of West Guangxi, College of Chemistry and Environmental Engineering, Baise University Baise 533000 China
State Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources, Guangxi Normal University Guilin 541004 China
RSC Adv. 2020 May 7;10(29):17369-17376. doi: 10.1039/d0ra02396e. eCollection 2020 Apr 29.
The fabrication of a -scheme heterojunction photocatalyst can effectively modulate the electron transfer and separation of photoinduced charge carriers to enhance photocatalytic performance. Here, we demonstrate a direct -scheme BiOCl-phosphotungstic acid (BiOCl-HPW) heterojunction, fabricated a one-step hydrothermal synthesis, as a highly active and stable photocatalyst for the photodegradation of tetracycline. BiOCl-HPWs result in a dramatic improvement in visible-light utilization and photogenerated e and h separation, as well as a decrease in the electrical resistance by the addition of HPW. Notably, the BiOCl-HPW heterojunction with optimized phosphotungstic acid (HPW) content achieved an outstanding photodegradation rate of tetracycline (0.0195 min). A reasonable -scheme photocatalytic mechanism based on the analysis of band structure and monitoring of active radicals is proposed. This study highlights the potential implications of the BiOCl-HPW heterojunctions in the photodegradation of other toxic chemicals and photocatalytic studies.
构建Z型异质结光催化剂能够有效调节光生载流子的电子转移与分离，从而提升光催化性能。在此，我们展示了一种通过一步水热合成法构建的直接Z型BiOCl-磷钨酸（BiOCl-HPW）异质结，它作为一种高活性且稳定的光催化剂用于四环素的光降解。BiOCl-HPW能够显著提高可见光利用率以及光生电子和空穴的分离效率，并且通过添加HPW降低了电阻。值得注意的是，具有优化磷钨酸（HPW）含量的BiOCl-HPW异质结对四环素实现了出色的光降解速率（0.0195 min⁻¹）。基于能带结构分析和活性自由基监测，提出了合理的Z型光催化机理。本研究突出了BiOCl-HPW异质结在其他有毒化学物质光降解及光催化研究中的潜在意义。
