Journal
CHEMICAL ENGINEERING JOURNAL
Volume 433, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.133741
Keywords
CDs; ZnIn2S4 ; Photocatalytic; Persulfate activation; Antibiotics
Categories
Funding
- National Natural Science Foundation of China [21906072, 22006057]
- Natural Science Foundation of Jiangsu Province [BK20190982]
- Henan Postdoctoral Foundation [202003013]
- Doctor of Mass entrepreneurship and innovation Project in Jiangsu Province, Doctoral Scientific Research Foundation of Jiangsu University of Science and Technology (China) [1062931806, 1142931803]
- Natural Science Youth Fund of Henan Province [202300410033]
- Henan Key Scientific Research Projects [20A150009]
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By introducing modified nanosheet catalyst and combining photo-induced electrons, this study achieved efficient degradation of tetracycline in a persulfate-oxidation hybrid system, providing new ideas and strategies for the development of carbon dot-based composite photocatalysts.
Photocatalytic/persulfate-oxidation hybrid (PPSOH) system is considered as a feasible method for antibiotic degradation owing to it contains affluent active species. Herein, the flower-shaped ZnIn2S4 (ZIS) nanosheets modified by carbon dots (CDs) to form CDs-ZIS composite was selected as a catalyst for degradation of tetracycline (TC) in PPOH system. The degradation experimental results reveal that the optimal photocatalytic performance of 1% Vis/CDs-ZIS/persulfate (PS) system was achieved with TC (50 mg/L) removal rate of 83% within 120 min, which is attributed to the successful introduction of CDs that can effectively combine photo-induced electrons of ZIS to co-activate PS for enhancing photocatalytic degradation of TC. The active species capturing experiments exhibit that with the unique electron transfer property of CDs, the synergistic effect between photocatalytic and persulfate-oxidation was realized, in which persulfate was captured by electrons and generated plentiful sulfate radicals (SO4 & BULL;-) and hydroxyl radicals (& BULL;OH). This work provides a new idea and strategy for CDs-based composite photocatalysts for the combination of photocatalysis and advanced oxidation.
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