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Degradation of glucocorticoids in water by dielectric barrier discharge and dielectric barrier discharge combined with calcium peroxide: performance comparison and synergistic effects
Author(s) -
Liu Yanan,
Wang Cihao,
Huang Keliang,
Miruka Andere Clement,
Dong Ai,
Guo Ying,
Zhang Ai
Publication year - 2019
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.6164
Subject(s) - dielectric barrier discharge , chemistry , nuclear chemistry , calcium , organic chemistry , electrode
BACKGROUND Degradation of glucocorticoids (GCs), including fluocinolone acetonide (FA), triamcinolone acetonide (TA) and clobetasol propionate (CP), in water by dielectric barrier discharge (DBD) and DBD combined with calcium peroxide treatment (DBD/CaO 2 ) were investigated. Effects of discharge power, pH, plasma‐working gas and CaO 2 dosage were examined during DBD and DBD/CaO 2 treatments. The synergistic output from the combination of CaO 2 with DBD on •OH concentration, pH, conductivity, CaO 2 adsorption and the overall influence on GC removal were assessed. Toxicity variations and feasibility to various water matrices by DBD and DBD/CaO 2 treatments also were analyzed and compared. RESULTS The removal efficiencies of FA, TA and CP achieved were 74%, 70% and 75%, respectively, at 36.68 W over 120 min in air with unadjusted pH (energy yield of 7.47 mg kW −1 h −1 ). Significant synergistic effects were observed in combining CaO 2 with DBD with a CaO 2 ‐concentration‐dependent mechanism. The removal efficiency of FA, TA and CP increased by 7%, 32% and 31%, respectively, by DBD/CaO 2 in comparison with DBD alone after 60 min treatments at CaO 2 dosage of 0.4 g L −1 . In addition, DBD/CaO 2 treatment was more effective in controlling toxicity and had better efficacy in various water matrices than DBD alone. CONCLUSION This study provides a reference point for the application of DBD and DBD/CaO 2 treatments to effectively remove GCs from water. © 2019 Society of Chemical Industry