%0 Journal Article
%T Biochar-Supported FeS/Fe3O4 Composite for Catalyzed Fenton-Type Degradation of Ciprofloxacin
%J Catalysts | An Open Access Journal from MDPI
%D 2019
%R https://doi.org/10.3390/catal9121062
%X 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/Fe 3O 4 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 (Fe 3O 4) 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 (ˇ¤OH) were proved to be the major reactive species contributing to the degradation reaction. The biochar increased the production of ˇ¤OH, but decreased the consumption of H 2O 2, and helped transform Fe 3+ into Fe 2+, according to the comparison studies using the unsupported FeS/Fe 3O 4 as the catalyst. All the three biochars prepared by pyrolysis at different temperatures (400, 500 and 600 ˇăC) were capable for enhancing the reactivity of the iron compound catalyst. View Full-Tex
%U https://www.mdpi.com/2073-4344/9/12/1062