期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 353, 期 -, 页码 26-34出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2018.02.034
关键词
Ferrocene; Photo-Fenton; Sulfamethoxazole; Heterogeneous catalysis; Degradation mechanisms
资金
- National Natural Science Foundation of China [21707058, 41761072, 21777064]
- High-Level Talent Foundation of Kunming University of Science and Technology [1411909411]
Readily-available and efficient catalyst is essential for activating oxidants to produce reactive species for deeply remediating water bodies contaminated by antibiotics. In this study, Ferrocene (Fc) was introduced to establish a heterogeneous photo-Fenton system for the degradation of sulfonamide antibiotics, taking sulfamethoxazole as a representative. Results showed that the removal of sulfamethoxazole was effective in Fc-catalyzed photo-Fenton system. Electron spin resonance and radical scavenging experiments verified that there was a photoindued electron transfer process from Fc to H2O2 and dissolved oxygen resulting in the formation of center dot OH that was primarily responsible for the degradation of sulfamethoxazole. The reactions of center dot OH with substructure model compounds of sulfamethoxazole unveiled that aniline moiety was the preferable reaction site of sulfamethoxazole, which was verified by the formation of hydroxylated product and the dimer of sulfamethoxazole in Fccatalyzed photo-Fenton system. This heterogeneous photo-Fenton system displayed an effective degradation efficiency even in a complex water matrices, and Fc represented a long-term stability by using the catalyst for multiple cycles. These results demonstrate that Fc-catalyzed photo-Fenton oxidation may be an efficient approach for remediation of wastewater containing antibiotics.
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