A green sulfidated micro zero-valent iron based-hydrogel for the synergistic removal of heavy metal cations and anions in groundwater

IF 8 1区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Science of the Total Environment Pub Date : 2025-03-14 DOI:10.1016/j.scitotenv.2025.179096

Tingting Wang , Zhewen Wang , Junxiang Shi , Ying Yin , Wenchao Du , Jichun Wu , Hongyan Guo

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Abstract

Heavy metal cations and anions contaminated groundwater was a big challenge to water resource safety. Herein, a green sulfidated micro zero-valent iron-based hydrogel (SA-S-mZVI) was synthesized using sodium alginate biomass for the simultaneous removal of heavy metal cations (Cu(II), Pb(II), Cd(II)) and anions (Cr(VI)). The sulfur modification and incorporation of sodium alginate hydrogel facilitated the efficient and sustainable removal of both single and multi-heavy metals. The co-existing heavy metal cations benefited the removal of Cr(VI), and heavy metals were mostly transformed into stable precipitates. The presence of organic substance and ions slightly affected the removal of heavy metals. Long-term column experiments (240 days) showed that SA-S-mZVI maintained over 99.9 % removal efficiency for heavy metal cations and anions, without adverse impacts on the groundwater environment. This study provided new insights into the development of eco-friendly, long-lasting zero-valent iron-based hydrogels for in-situ remediation of heavy metals-contaminated groundwater.

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绿色硫化微零价铁基水凝胶协同去除地下水中重金属阳离子和阴离子

重金属阳离子和阴离子对地下水的污染是对水资源安全的重大挑战。本文以海藻酸钠生物质为原料合成了一种绿色硫化微零价铁基水凝胶（SA-S-mZVI），可同时去除重金属阳离子（Cu（II）、Pb（II）、Cd(II)）和阴离子（Cr(VI)）。硫改性和海藻酸钠水凝胶的掺入促进了单一和多种重金属的高效和可持续去除。共存的重金属阳离子有利于Cr（VI）的去除，重金属大部分转化为稳定的沉淀。有机物和离子的存在对重金属的去除影响较小。长期柱试验（240 d）表明，SA-S-mZVI对重金属阳离子和阴离子的去除率保持在99.9%以上，对地下水环境无不良影响。该研究为开发生态友好、长效零价铁基水凝胶用于重金属污染地下水的原位修复提供了新的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science of the Total Environment 环境科学-环境科学

CiteScore

17.60

自引率

10.20%

发文量

8726

审稿时长

2.4 months

期刊介绍： The Science of the Total Environment is an international journal dedicated to scientific research on the environment and its interaction with humanity. It covers a wide range of disciplines and seeks to publish innovative, hypothesis-driven, and impactful research that explores the entire environment, including the atmosphere, lithosphere, hydrosphere, biosphere, and anthroposphere. The journal's updated Aims & Scope emphasizes the importance of interdisciplinary environmental research with broad impact. Priority is given to studies that advance fundamental understanding and explore the interconnectedness of multiple environmental spheres. Field studies are preferred, while laboratory experiments must demonstrate significant methodological advancements or mechanistic insights with direct relevance to the environment.