期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 403, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124026
关键词
Fenton-like reaction; Humic acid; Coprecipitate; Sulfanilamide
资金
- National Natural Science Foundation of China [21876023]
- Programme of Introducing Talents of Discipline to Universities [B13012]
This study investigated the catalytic degradation of sulfanilamide using goethite and HA (Gt-HA) coprecipitates with different C:Fe molar ratios. The Gt-HA system with optimal C:Fe ratio of 0.30 showed higher efficiency in degrading sulfanilamide compared to the control Gt system, with improved H2O2 activation and center dot OH production. Additionally, the study demonstrated the potential of developing Fe-C coprecipitates as efficient catalysts in Fenton-like processes.
While extensive studies found that dissociative and iron mineral-adsorbed humic acid (HA) could either stimulate or inhibit Fenton-like processes, little was known about the influence of iron mineral-coprecipitated HA on Fenton-like reactions. Here, goethite and HA (Gt-HA) coprecipitates having different C:Fe molar ratios (C:Fe = 0.16-0.99) were biologically prepared, and for the first time, investigated for their abilities of H2O2 activation and catalytic degradation of sulfanilamide. For system containing Gt-HA with the optimal C:Fe ratio of 0.30, over 91.1% of sulfanilamide (10 mg/L) was removed in 2 h, which was 46.2% higher than that of the control Gt system. Additionally, H2O2 decomposition, center dot OH production, and organic carbon removal in Gt-HA systems were all more efficient than those in Gt system. Higher carbon moieties stability and lower micropore surface area of Gt-HA decreased the competition for center dot OH and H2O2, thus helped to improve degradation efficiency. Electrochemical analysis, quenching experiments, and Fe species detection showed that the coprecipitated HA could serve as electron shuttle and complex with Fe(III) mainly via carboxyl groups at octahedral sites to improve Fe (III)/Fe(II) transformation. This study improved our understanding of Fe(III)/Fe(II) cycling in Fe-C coprecipitates and demonstrated the potential of developing Fe-C coprecipitates as efficient catalysts in Fenton-like processes.
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