文献类型：期刊文献

英文题名：Biochar-supported FeS/Fe3O4 composite for catalyzed fenton-type degradation of ciprofloxacin

作者：Wang Y.; Zhu X.; Feng D.; Hodge A.K.; Hu L.; Lü J.; Li J.

机构：[1]Department of Chemistry, Shaoxing University, Shaoxing, 312000, China

年份：2019

卷号：9

期号：12

外文期刊名：Catalysts

收录：Scopus(收录号：2-s2.0-85076611628)

语种：英文

外文关键词：Advanced oxidation processes; Antibiotic; Biochar; Fenton reactions; Heterogeneous catalysts; Iron mineral; Organic pollutants; Water treatment

外文摘要：The Fenton-type oxidation catalyzed by iron minerals is a cost-efficient and environment-friendly technology for the degradation of organic pollutants in water, but their catalytic activity needs to be enhanced. In this work, a novel biochar-supported composite containing both iron sulfide and iron oxide was prepared, and used for catalytic degradation of the antibiotic ciprofloxacin through Fenton-type reactions. Dispersion of FeS/Fe3O4 nanoparticles was observed with scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) and transmission electron microscopy (TEM). Formation of ferrous sulfide (FeS) and magnetite (Fe3O4) in the composite was validated by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Ciprofloxacin (initial concentration = 20 mg/L) was completely degraded within 45 min in the system catalyzed by this biochar-supported magnetic composite at a dosage of 1.0 g/L. Hydroxyl radicals (·OH) were proved to be the major reactive species contributing to the degradation reaction. The biochar increased the production of ·OH, but decreased the consumption of H2O2, and helped transform Fe3+ into Fe2+, according to the comparison studies using the unsupported FeS/Fe3O4 as the catalyst. All the three biochars prepared by pyrolysis at different temperatures (400, 500 and 600?C) were capable for enhancing the reactivity of the iron compound catalyst. ? 2019 by the authors. Licensee MDPI, Basel, Switzerland.