Wu Qian, Lai Xiaoqing, Ji Xiao-Hui, Jiang Hai, Du Peng
Department of Microelectronic Science and Engineering, School of Physical Science and Technology, Ningbo University, 315211 Ningbo, Zhejiang, China.
Shaanxi Province Key Laboratory of Catalysis, College of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong 723001, P. R. China.
Phys Chem Chem Phys. 2023 Aug 30;25(34):22819-22831. doi: 10.1039/d3cp02381h.
To manipulate the photocatalytic activities of BiOCl photocatalysts, doping and heterojunction engineering are simultaneously adopted. Herein, the photocatalysts Sm-doped BiOCl and BiOCl:Sm@g-CN were designed, in which their phase structure, morphology, optical properties and photocatalytic activities were systematically discussed. Excited at 408 nm, red emissions are seen from Sm-doped BiOCl microplates and their intensities were impacted by doping content, reaching the maximum value when the Sm content was 1 mol% and the involved concentration mechanism was dominated by quadrupole-quadrupole interaction. Through analyzing the degradation of TC, the visible light triggered photocatalytic behaviors of the resultant compounds were studied. Compared with BiOCl microplates, an improved TC removal ability was seen in Sm-doped BiOCl microplates and the products with a Sm content of 0.5 mol% show the best performance. Moreover, through constructing the heterojunction with g-CN, the TC removal capacity was further enhanced and the BiOCl:Sm@60%g-CN exhibits the optimal photocatalytic activity, which was also much better than that of the commercial SnO and TiO. Accordingly, the ˙O, h and ˙OH active species were proven to contribute to the involved visible light driven photocatalytic mechanism. Furthermore, the separation and recombination of photogenerated carries the Z-scheme transfer process in the designed heterojunction composites, led to splendid photocatalytic properties. Additionally, it was verified that the TC solution treated with synthesized compounds was nontoxic toward plant growth. Our findings may propose an available route to regulate the photocatalytic performance of the visible light driven photocatalysts.
为了调控BiOCl光催化剂的光催化活性，同时采用了掺杂和异质结工程。在此，设计了Sm掺杂的BiOCl光催化剂和BiOCl:Sm@g-CN，系统地讨论了它们的相结构、形貌、光学性质和光催化活性。在408 nm激发下，Sm掺杂的BiOCl微板呈现红色发射，其强度受掺杂含量影响，当Sm含量为1 mol%时达到最大值，且相关的浓度机制以四极-四极相互作用为主导。通过分析TC的降解情况，研究了所得化合物的可见光触发光催化行为。与BiOCl微板相比，Sm掺杂的BiOCl微板对TC的去除能力有所提高，Sm含量为0.5 mol%的产物表现出最佳性能。此外，通过与g-CN构建异质结，TC去除能力进一步增强，BiOCl:Sm@60%g-CN表现出最佳的光催化活性，也远优于商用的SnO和TiO。因此，˙O、h和˙OH活性物种被证明对所涉及的可见光驱动光催化机制有贡献。此外，光生载流子在设计的异质结复合材料中的分离和复合以及Z型转移过程，导致了出色的光催化性能。此外，还证实了用合成化合物处理的TC溶液对植物生长无毒。我们的研究结果可能为调控可见光驱动光催化剂的光催化性能提供一条可行的途径。
