Three-in-One: Coupling Chemical Reduction, Photoreduction, and Ion-Exchange Mechanisms in Greigite/Red Soil-Based Analcime Zeolite Composites for Cr(VI) Remediation in Groundwater,ACS ES&T Engineering

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Three-in-One: Coupling Chemical Reduction, Photoreduction, and Ion-Exchange Mechanisms in Greigite/Red Soil-Based Analcime Zeolite Composites for Cr(VI) Remediation in Groundwater
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2023-11-02 , DOI: 10.1021/acsestengg.3c00385
Huan Tang ₁ , Shimao Deng ₁ , Zheting Chu ₁ , Yangzi Shangguan ₁ , Jiaxin Liang ₁ , Qian Zheng ₁ , Ranhao Wang ₁ , Hong Chen ₁

Affiliation

Simultaneously reducing and immobilizing Cr(VI) anions in groundwater are crucial to minimize their hazardous effects. Herein, benefiting from the feasible chemical-/photo-reduction capability of greigite, together with the ion-exchange functionality of zeolites, the integrated three-in-one function in greigite/Re-ANA composites (GRAs) material has been employed for removing and immobilizing Cr(VI) in groundwater remediation. GRA-3 achieved a 99.4% Cr(VI) removal efficiency in a Cr(VI) solution with 1 mg/L. Cr(VI) residue concentration is 0.006 mg/L, complying with the control guideline in drinking water according to WHO regulations. A comprehensive mechanism study reveals that the chemical reduction and photoreduction processes are involved within greigite, which drives the process of reducing Cr(VI) to Cr(III). Subsequently, the as-reduced Cr(III) is either adsorbed on a greigite surface or ion-exchanged with zeolite microporous channels, thus getting immobilized. Furthermore, environmentally relevant Cr(VI) contaminated groundwater sampling from the chromate plant has been employed for the fixed-bed column study, which achieved the discharge standard for practical Cr(VI) polluted groundwater. This work reported a composite material matrix with great potential and significance for Cr(VI) remediation, which could be employed in permeable reactive barriers for Cr(VI)-polluted groundwater remediation in the future.

中文翻译：

三合一：钙镁石/红土基方沸石沸石复合材料中化学还原、光还原和离子交换机制的耦合用于修复地下水中的 Cr(VI)

同时减少和固定地下水中的 Cr(VI) 阴离子对于最大限度地减少其有害影响至关重要。在此，受益于硅灰石可行的化学/光还原能力，以及沸石的离子交换功能，硅灰石/Re-ANA复合材料（GRA）材料中的集成三合一功能已被用于去除以及在地下水修复中固定 Cr(VI)。 GRA-3 在 1 mg/L 的 Cr(VI) 溶液中实现了 99.4% Cr(VI) 的去除效率。 Cr(VI)残留浓度为0.006 mg/L，符合世界卫生组织规定的饮用水控制指南。综合机制研究表明，镁灰石中涉及化学还原和光还原过程，驱动了 Cr(VI) 还原为 Cr(III) 的过程。随后，还原后的 Cr(III) 被吸附在镁镁石表面或与沸石微孔通道进行离子交换，从而被固定化。此外，采用铬酸盐厂环境相关的Cr(VI)污染地下水取样进行固定床柱研究，达到了实际Cr(VI)污染地下水的排放标准。这项工作报道了一种对 Cr(VI) 修复具有巨大潜力和意义的复合材料基质，可用于未来 Cr(VI) 污染地下水修复的渗透反应屏障。

更新日期：2023-11-02

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