Li Dongyuan, Peng Xiaojun, Zhang Rui, Chen Yadong, Dai Xianwei, Wang Wenling
State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, 610059, China.
Southwest Institute of Chemical Co., Ltd, Chengdu, 610225, China.
Environ Res. 2025 Jul 1;276:121483. doi: 10.1016/j.envres.2025.121483. Epub 2025 Mar 25.
The Z-type heterojunction CoS/BiOI material was prepared by the solvothermal method. The crystal structure and surface elemental valence state of the material were investigated by XRD, XPS, and other characterization methods. The microstructure of the material was investigated by SEM, BET, and other methods. In the experiment of degradation of 20 mg/L tetracycline hydrochloride using the prepared photocatalytic materials, the optimal photocatalytic performance of CoS/BiOI was explored with the introduction of 1.5 % CoS, and the degradation rate could reach 94.7 %. It was also found that 1.5 % CoS/BiOI had stable photocatalytic performance and good photocatalytic performance for all tetracycline antibiotics. Then the possible degradation pathways in the degradation process of TCH were explored using GC-MS, and the acute toxicity of the intermediates was evaluated by ECOSAR software. The UV-vis-DRS results showed that the overall photoelectrical properties of the composites were enhanced after introducing CoS with broad-spectrum absorption properties, and the PL and EIS results also proved the collation. The possible degradation mechanism of the CoS/BiOI system was also speculated by combining the free radical trapping experiments with the M-S curve results. The increasing severity of antibiotic pollution necessitates the development of highly efficient photocatalytic materials to enhance environmental remediation capabilities. Traditional photocatalysts suffer from high recombination rates of photogenerated carriers and low degradation efficiency. To enhance the photocatalytic activity and cycling stability of BiOI, we synthesized a CoS/BiOI heterojunction material via a solvothermal method. Using 20 mg/L TCH as a model pollutant, we investigated the photocatalytic efficiency of the prepared material. Through comprehensive experiments and structural analyses using XRD, XPS, and SEM, we explored the photocatalytic degradation performance and mechanism of tetracycline, confirming that CoS/BiOI is an ideal material for constructing a Z-type heterojunction, effectively reducing the recombination of photogenerated electron-hole pairs. Compared to pure BiOI, the CoS/BiOI composite exhibits superior performance in improving charge separation efficiency and enhancing visible light absorption. This study successfully constructs a Z-type heterojunction with efficient electron-hole separation, significantly enhancing photocatalytic efficiency. The composite material holds great potential for antibiotic pollution treatment, while the elucidation of its photocatalytic degradation mechanism provides theoretical guidance for designing novel photocatalysts.
采用溶剂热法制备了Z型异质结CoS/BiOI材料。通过XRD、XPS等表征方法研究了该材料的晶体结构和表面元素价态。通过SEM、BET等方法研究了材料的微观结构。在使用制备的光催化材料降解20mg/L盐酸四环素的实验中，引入1.5%的CoS时，探究了CoS/BiOI的最佳光催化性能，降解率可达94.7%。还发现1.5%的CoS/BiOI具有稳定的光催化性能，对所有四环素类抗生素都有良好的光催化性能。然后利用GC-MS探究了TCH降解过程中可能的降解途径，并通过ECOSAR软件评估了中间体的急性毒性。UV-vis-DRS结果表明，引入具有广谱吸收性能的CoS后，复合材料的整体光电性能得到增强，PL和EIS结果也证实了这一点。结合自由基捕获实验和M-S曲线结果，推测了CoS/BiOI体系可能的降解机理。抗生素污染的日益严重促使人们开发高效的光催化材料以提高环境修复能力。传统光催化剂存在光生载流子复合率高、降解效率低的问题。为了提高BiOI的光催化活性和循环稳定性，我们通过溶剂热法合成了CoS/BiOI异质结材料。以20mg/L的TCH作为模型污染物，研究了所制备材料的光催化效率。通过XRD、XPS和SEM等综合实验和结构分析，探究了四环素的光催化降解性能和机理，证实CoS/BiOI是构建Z型异质结的理想材料，有效减少了光生电子-空穴对的复合。与纯BiOI相比，CoS/BiOI复合材料在提高电荷分离效率和增强可见光吸收方面表现出优异的性能。本研究成功构建了具有高效电子-空穴分离的Z型异质结，显著提高了光催化效率。该复合材料在抗生素污染治理方面具有巨大潜力，同时对其光催化降解机理的阐明为新型光催化剂的设计提供了理论指导。
