数字农科院2.0

Using thiol-functionalized montmorillonites for chemically immobilizing Hg in contaminated water and soil: A comparative study of intercalation and grafting functionalization

文献类型： 外文期刊

作者： Penggang Pei;Tao Sun;Yingming Xu;Yuebing Sun

作者机构：

关键词： EXAFS;Mercury;Montmorillonite;Stabilization remediation;Thiol-functionalization

期刊名称： Applied Clay Science

ISSN： 0169-1317

年卷期： 2022 年 216 卷

页码：

收录情况： SCIE（2022版） ; EI（2022版）

摘要： Mercury (Hg) contamination in water and soil is of great concern due to its high toxicity and biomagnification in food chain. In this study, clay mineral montmorillonites (Mt) was thiol-functionalized via 2–mercaptoethylammonium intercalation (ISH–Mt) and 3–mercaptopropyltrimethoxysilane surface grafting (GSH–Mt) for enhancing remediation ability of Hg contamination. Characterization results indicated that surface grafting significantly changed surface morphology and porous structure, with rougher surface, larger specific surface area and more porous structure. The adsorption capacity of Hg2+ was significantly enhanced by thiol functionalization, being 141.55 and 136.92 mg g−1 for ISH–Mt and GSH–Mt, respectively. Fitting results of pseudo-second-order kinetic models (R2 = 0.879– 0.930) and Freundlich isotherms (R2 = 0.900– 0.950) indicated that Hg2+ was adsorbed on heterogeneous surfaces with chemical processes as the rate-limiting step. TCLP-Hg concentrations in soils after applying ISH–Mt and GSH–Mt (0.1%–1% dosage, m/m) were < 200 μg L−1 (The Leaching Standards of Hazardous Wastes, USEPA). Hg fractionation shifted from mobile fractions (exchangeable and carbonate-bound) to stable forms (organic matter-bound). XPS and Hg LIII-edge EXAFS studies revealed that the complexation of –SH toward Hg was the primary mechanism for Hg adsorption and stabilization. These results illustrated that thiol-functionalized Mts prepared by intercalation and surface grafting are promising for the remediation of Hg-contaminated water and soil.

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