Oxidative Degradation of Organic Contaminants by FeS in the Presence of O2

Environmental Science & Technology
Dong ChengAo Qian

Abstract

Reductive transformation of organic contaminants by FeS in anoxic environments has been documented previously, whereas the transformation in oxic environments remains poorly understood. Here we show that phenol can be efficiently oxidized in oxic FeS suspension at circumneutral pH value. We found that hydroxyl radicals (•OH) were the predominant reactive oxidant and that a higher O2 content accelerated phenol degradation. Phenol oxidation depended on •OH production and utilization efficiency, i.e., phenol degraded per •OH produced. Low FeS contents (≤1 g/L) produced less •OH but higher utilization efficiency, while high contents produced more •OH but lower utilization efficiency. Consequently, the most favorable conditions for phenol oxidation occurred during the long-term interaction between dissolved O2 and low levels of FeS (i.e., ≤1 g/L). Mössbauer spectroscopy suggests that FeS oxidation to lepidocrocite initially produced an intermediate Fe(II) phase that could be explained by the apparent preferential oxidation of structural S(-II) relative to Fe(II), rendering a higher initial •OH yield upon unit of Fe(II) oxidation. Trichloroethylene can be also oxidized under similar conditions. Our results demonstrate that oxidative ...Continue Reading

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Citations

Jan 2, 2021·The Science of the Total Environment·Kaikai ZhangYanrong Zhang
Apr 13, 2021·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Haijun LiNa Liu
Jun 19, 2021·Chemical Reviews·Jianzhi HuangHuichun Zhang
Jul 30, 2021·Journal of Hazardous Materials·Jong-Gook KimKitae Baek
Jul 31, 2021·Journal of Hazardous Materials·Ying CaiJinhong Fan

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