期刊
CHEMOSPHERE
卷 259, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.127465
关键词
Nitrogen-deficient g-C3Nx; POMs; P-N heterojunctions; Ciprofloxacin; Adsorption; Photo-catalysis
资金
- National Natural Science Foundation of China [41977129, 21607176]
- Changsha outstanding innovative youth training program [kq1802011]
- Natural Science Foundation of Hunan Province, China [2020JJ4136, 2017JJ3516]
- Hunan University Students Entrepreneurship Training Project [S201910538054X]
- Research Foundation of Education Bureau of Hunan Province, China [16B274]
The direct shedding of piperazine rings is critical for the degradation of antibiotic persistent organic pollutants. In this work, nitrogen-deficient g-C3N4 loaded with polyoxometalates porous photocatalysts with P-N heterojunctions were carried out through the formation of chemical bonds between the nitrogen-deficient C+ in g-C3Nx and the bridging oxygen in polyoxometalates (POMs), including phosphomolybdic acid (PMA), phosphotungstic acid (PTA) and silicotungstic acid (STA). The adsorption and photocatalysis experiments confirm the ability of the g-C3Nx/POMs nanosheets to efficiently remove ciprofloxacin via the synergistic effects of adsorption and photo-catalysis. Approximately, g-C3Nx/POMs30 exhibits the optimal degradation ability, and the degradation rates of g-C3Nx/PMA-30, g-C3Nx/PTA-30 and g-C3Nx/STA-30 could respectively reach 93.1%, 97.4% and 95.6% within only 5 min under visible light. The free radical scavenging experiment and ESR free radical capture experiments confirm that $OH and center dot O-2- are free radicals that effectively degrade CIP. According to the results of the LC-MS analysis, the intermediates produced after CIP degradation and the efficient degradation pathway are proposed. The direct shedding of piperazine rings in the decarboxylation and defluorination process leads to the most efficient degradation of CIP into the small molecules. (C) 2020 Elsevier Ltd. All rights reserved.
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