Coupled sorptive and oxidative antimony(III) removal by iron-modified biochar: Mechanisms of electron-donating capacity and reactive Fe species

文献类型： 外文期刊

第一作者： Gao, Yurong

作者： Gao, Yurong;Fang, Zheng;Wang, Hailong;Chen, Hanbo;Niazi, Nabeel Khan;Adusei-Fosu, Kwasi;Li, Jianhong;Yang, Xing;Liu, Zhongzhen;Bolan, Nanthi S.;Bolan, Nanthi S.;Gao, Bin;Hou, Deyi;Sun, Chenghua;Meng, Jun;Chen, Wenfu;Wang, Hailong;Quin, Bert F.

作者机构：

关键词： Adsorption; Engineered biochar; Functionalized biochar; Metalloid; Density functional theory

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.9； 五年影响因子：9.5 ）

ISSN： 0269-7491

年卷期： 2023 年 337 卷

页码：

收录情况： SCI

摘要： Sorption and oxidation are two potential pathways for the decontamination of trivalent antimony (Sb(III))-bearing water, using iron (Fe)-modified biochar (FeBC). Here we investigated the sorption and oxidation behavior of FeBC for Sb(III) in aqueous solutions. Results revealed that Sb(III) removal by FeBC was significantly improved showing the maximum Sb(III) sorption (64.0 mg g-1). Density functional theory (DFT) calculations indicated that magnetite (Fe3O4) in FeBC offered a sorption energy of-0.22 eV, which is 5 times that of non-modified biochar. With the addition of peroxymonosulfate (PMS), the sorption of Sb(III) on FeBC was 7 times higher than that on BC, indicating the sorption capacity of FeBC for Sb(III) could be substantially increased by adding oxidizing agents. Electrochemical analysis showed that Fe modification imparted FeBC higher electron-donating capacity than that of BC (0.045 v. s. 0.023 mmol e- (g biochar)-1), which might be the reason for the strong Sb(III) oxidation (63.6%) on the surface of FeBC. This study provides new information that is key for the development of effective biochar-based composite materials for the removal of Sb(III) from drinking water and wastewater. The findings from this study have important implications for protecting human health and agriculture.

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