期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 622, 期 -, 页码 995-1007出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.04.179
关键词
Bismuth oxychloride; Small molecule intercalation; Broad-spectrum antibiotics; Photocatalytic degradation; Toxicity reduction
资金
- National Natural Science Foun-dation of China [42177353, 51879228]
- Fundamental Research Funds for the Central Universities [B210205008]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
A series of small molecular intercalated bismuth oxychloride composite photocatalysts were successfully constructed, showing excellent photocatalytic degradation performance against broad-spectrum antibiotics under visible light. The improved specific surface area and the accelerated charge transfer between layers by intercalated molecules were the main factors contributing to the enhanced degradation efficiency.
In view of the increasing threat of overuse of broad-spectrum antibiotics to water environment, here, a series of small molecular intercalated bismuth oxychloride (SBC-X) composite photocatalysts were successfully constructed by a simple stirring synthesis at room temperature. Among them, SBC-0.5 showed excellent photocatalytic performance against the three target broad-spectrum antibiotics in visible light, which was 3.06 times, 5.93 times and 11.64 times higher than that of monomer for degrading tetracycline, norfloxacin and ciprofloxacin, respectively. Through analysis, it was found that the excellent photocatalytic degradation performance of SBC-0.5 was mainly attributed to the greatly improved specific surface area, which increased to 14 times of monomer, providing a large number of reaction sites for the subsequent photocatalytic degradation. Besides, intercalated molecules as charge transfer bridges between nanosheets greatly accelerated the efficiency of photogenerated charge transfer between layers. Free radical trapping experiments and electron spin resonance indicated that superoxide anion radicals played a major role in the photocatalytic degradation, followed by singlet oxygen. Furthermore, nine potential degradation intermediates were identified, and the toxicity was greatly reduced confirmed by ECOSAR software prediction and soybean seed germination and seeding growth experiment. Our work will provide useful information for the purification of wastewater containing antibiotics. (c) 2022 Elsevier Inc. All rights reserved.
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