期刊
CHEMICAL ENGINEERING JOURNAL
卷 380, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.122427
关键词
Recalcitrant; Emerging contaminants; Manganese oxidizing bacteria; Advanced oxidation; Ecotoxicity
资金
- Natural Science Research Program of Jiangsu Province for Colleges and Universities [18KJA610001]
- Natural Science Foundation of Jiangsu Province [BK20160989]
Ofloxacin (OFL), a typical fluoroquinolone antibiotic, has been frequently detected in the aquatic environment and may cause potential ecological risks. In this work, biogenic Fe-Mn oxides (bio-FeMnOx) were produced by Pseudomonas sp. F2. The harvested bio-FeMnOx mainly consisted of gamma-Fe2O3 and a mix valence of Mn2+, Mn3+ and Mn4+ and was applied for the first time to catalyze the heterogeneous photo-Fenton for the degradation of OFL as a model organic contaminant. It was found that bio-FeMnOx exhibited a 2-fold higher catalytic activity than chemically synthesized Fe-Mn oxides: pseudo-first-order kinetic constant 3.41 x 10(-2) min(-1) vs 1.53 x 10(-2) min(-1), respectively. The scavenger study indicated the substantial participation of hydroxyl radical (OH center dot), electron (e(-)) and hole (h(+)) in the degradation of OFL but a negligible involvement of superoxide radical anion (O-2(center dot-)). Possible intermediates were identified with HPLC-MS, revealing that the degradation may involve the reactions of hydrolysis, dehydration, dealkylation, and C=C breakage. In addition, nearly 50% of the biological respiration inhibition of OFL was removed after the heterogeneous photo-Fenton over bio-FeMnOx.
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