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

Tang, Huan; Deng, Shimao; Chu, Zheting; Shangguan, Yangzi; Liang, Jiaxin; Zheng, Qian; Wang, Ranhao; Chen, Hong

2023-11-02

10.1021/acsestengg.3c00385

ACS ES&T ENGINEERING   影响因子和分区

2690-0645

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.

greigite/Re-ANA composites Cr(VI)-polluted groundwaterremediation chemical reduction photoreduction ion-exchange

ESCI

英语

第一 ; 通讯

National Key Research and Development Program of China[2020B1515020022] ; Natural Science Funds for Distinguished Young Scholar of Guangdong Province, China[2021YFA1202500] ; National Key Research and Development Program of China[ZDSYS20200421111401738]

Engineering

Engineering, Environmental

WOS:001158815500001

AMER CHEMICAL SOC

Web of Science

Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China

Tang, Huan,Deng, Shimao,Chu, Zheting,et al. 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[J]. ACS ES&T ENGINEERING,2023,4(2).

Tang, Huan.,Deng, Shimao.,Chu, Zheting.,Shangguan, Yangzi.,Liang, Jiaxin.,...&Chen, Hong.(2023).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,4(2).

Tang, Huan,et al."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 4.2(2023).