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Zhang J, Hu H, Chao J, Tang Y, Wan P, Yuan Q, Fisher AC, Coulon F, Hu Q, Yang XJ. Groundwater remediation using Magnesium-Aluminum alloys and in situ layered doubled hydroxides. ENVIRONMENTAL RESEARCH 2022; 204:112241. [PMID: 34695428 DOI: 10.1016/j.envres.2021.112241] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Revised: 10/08/2021] [Accepted: 10/16/2021] [Indexed: 06/13/2023]
Abstract
In situ remediation of groundwater by zerovalent iron (ZVI)-based technology faces the problems of rapid passivation, fast agglomeration, limited range of pollutants and secondary contamination. Here a new concept of Magnesium-Aluminum (Mg-Al) alloys and in situ layered double hydroxides on is proposed for the degradation and removal of a wide variety of inorganic and organic pollutants from groundwater. The Mg-Al alloy provides the electrons for the chemical reduction and/or the degradation of pollutants while released Mg2+, Al3+ and OH- ions react to generate in situ LDH precipitates, incorporating other divalent and trivalent metals and oxyanions pollutants and further adsorbing the micropollutants. The Mg-Al alloy outperforms ZVI for treating acidic, synthetic groundwater samples contaminated by complex chemical mixtures of heavy metals (Cd2+, Cr6+, Cu2+, Ni2+ and Zn2+), nitrate, AsO33-, methyl blue, trichloroacetic acid and glyphosate. Specifically, the Mg-Al alloy achieves removal efficiency ≥99.7% for these multiple pollutants at concentrations ranging between 10 and 50 mg L-1 without producing any secondary contaminants. In contrast, ZVI removal efficiency did not exceed 90% and secondary contamination up to 220 mg L-1 Fe was observed. Overall, this study provides a new alternative approach to develop efficient, cost-effective and green remediation for water and groundwater.
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Affiliation(s)
- Jingqi Zhang
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Hanjun Hu
- Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China; Beijing Huanding Environmental Big Data Institute, No. 1 Wangzhuang Road, Beijing, 100083, China
| | - Jingbo Chao
- National Institute of Metrology, Beijing, 100029, China
| | - Yang Tang
- National Fundamental Research Laboratory of New Hazardous Chemicals Assessment and Accident Analysis, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Pingyu Wan
- National Fundamental Research Laboratory of New Hazardous Chemicals Assessment and Accident Analysis, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Qipeng Yuan
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Adrian C Fisher
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, CB2 1TN, UK
| | - Frederic Coulon
- School of Water, Energy and Environment, Cranfield University, Cranfield, MK43 0AL, UK
| | - Qing Hu
- Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China; Beijing Huanding Environmental Big Data Institute, No. 1 Wangzhuang Road, Beijing, 100083, China
| | - Xiao Jin Yang
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
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