Removal of Antibiotic Florfenicol by Sulfide-Modified Nanoscale Zero-Valent Iron
- 25 September 2017
- journal article
- research article
- Published by American Chemical Society (ACS) in Environmental Science & Technology
- Vol. 51 (19), 11269-11277
- https://doi.org/10.1021/acs.est.7b02480
Abstract
Florfenicol (FF, C12H14Cl2FNO4S), an emerging halogenated organic contaminant of concern was effectively degraded in water by sulfidized nanoscale zerovalent iron (S-nZVI). Sulfidized nZVI (62.5 m2 g–1) that was prepared using a one-step method resulted in small Fe0/Fe-sulfide particles that were more stable against aggregation than unsulfidized nZVI (10.2 m2 g–1). No obvious removal of FF was observed by unsulfidized nZVI. S-nZVI degraded FF, having a surface area normalized reaction rate constant of 3.1 × 10–4 L m–2 min–1. The effects of the S/Fe molar ratio, initial FF concentration, initial pH, temperature, and water composition on the removal of FF by S-nZVI, and on the formation of reaction products, were systematically investigated. Both dechlorination and defluorination were observed, resulting in four degradation products (C12H15ClFNO4S, C12H16FNO4S, C12H17NO4S, and C12H17NO5S). High removal efficiencies of FF by S-nZVI were achieved in groundwater, river water, seawater, and wastewater. The reactivity of S-nZVI was relatively unaffected by the presence of both dissolved ions and organic matter in the waters tested.Keywords
Funding Information
- Ministry of Science and Technology of the People's Republic of China (2016YFC0402600)
- Shanghai Municipal Education Commission (16CG23)
- National Natural Science Foundation of China (21477108, 41522111)
- Shanghai Education Development Foundation
- Shanghai Pujiang Program (15PJD014)
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