The role of Fe(IV) in the zero-valent iron biochar activated persulfate system for treatment of contaminants of emerging concern

文献类型： 外文期刊

第一作者： Gong, Wenwen

作者： Gong, Wenwen;He, Dandan;Wang, Xiao;Yan, Yuting;Peng, Guilong;Dionysiou, Dionysios D.;Blaney, Lee;Peng, Guilong

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关键词： PMSO; Fe(IV); Ferryl iron; Advanced oxidation process; Zero-valent iron; Biochar

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.3； 五年影响因子：13.2 ）

ISSN： 1385-8947

年卷期： 2024 年 487 卷

页码：

收录情况： SCI

摘要： In this paper, Fe(IV) was analyzed in the zero-valent iron biochar (ZVI-BC) activated persulfate (PS) process with methyl phenyl sulfoxide (PMSO) as the probe compound. Without a reaction terminator, PMSO degradation continued during the sample holding time, resulting in significant errors in the kinetics analysis. When 1 mM NaNO2, 1 mM NH2OH, 10 mM Na2S2O3, or 10 mM dimethyl sulfoxide were used as terminators, the concentrations of PMSO and its oxidation product, methyl phenyl sulfone (PMSO2), were effectively maintained without changes during the sample holding period. Furthermore, the terminators did not interfere with PMSO or PMSO2 analysis by high performance liquid chromatography. In addition to Fe(IV), free radical (i.e., SO4 center dot-, (OH)-O-center dot, O-2(center dot-)) and nonradical (i.e., O-1(2)) reactive species were also involved in the ZVI-BC/PS system; however, Fe(IV) was the predominant reactive species. Organic contaminants with electron-donating moieties rapidly reacted with Fe (IV), and the relative contribution of Fe(IV) to overall contaminant degradation decreased as the solution pH was increased. Overall, this study provided new insights into the quantitative analysis of Fe(IV) in the ZVI-BC/PS system and its application to treatment of organic contaminants in solutions with variable water quality.

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