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Review

Chelating Agents in Assisting Phytoremediation of Uranium-Contaminated Soils: A Review

by 1, 1, 2, 1 and 1,*
1
College of Water Sciences, Beijing Normal University, Beijing 100875, China
2
School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Academic Editors: Hosam M. Saleh and Mohammad Mahmoud Dawoud
Sustainability 2022, 14(10), 6379; https://doi.org/10.3390/su14106379
Received: 13 April 2022 / Revised: 15 May 2022 / Accepted: 18 May 2022 / Published: 23 May 2022
(This article belongs to the Special Issue Radioactivity: Sustainable Materials and Innovative Techniques)
Massive stockpiles of uranium (U) mine tailings have resulted in soil contamination with U. Plants for soil remediation have low extraction efficiency of U. Chelating agents can mobilize U in soils and, hence, enhance phytoextraction of U from the soil. However, the rapid mobilization rate of soil U by chelating agents in a short period than plant uptake rate could increase the risk of groundwater contamination with soluble U leaching down the soil profile. This review summarizes recent progresses in synthesis and application of chelating agents for assisting phytoremediation of U-contaminated soils. In detail, the interactions between chelating agents and U ions are initially elucidated. Subsequently, the mechanisms of phytoextraction and effectiveness of different chelating agents for phytoremediation of U-contaminated soils are given. Moreover, the potential risks associated with chelating agents are discussed. Finally, the synthesis and application of slow-release chelating agents for slowing down metal mobilization in soils are presented. The application of slow-release chelating agents for enhancing phytoextraction of soil U is still scarce. Hence, we propose the preparation of slow-release biodegradable chelating agents, which can control the release speed of chelating agent into the soil in order to match the mobilization rate of soil U with plant uptake rate, while diminishing the risk of residual chelating agent leaching to groundwater. View Full-Text
Keywords: chelator; soil uranium; mobilization; phytoextraction; slow release chelator; soil uranium; mobilization; phytoextraction; slow release
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MDPI and ACS Style

You, Y.; Dou, J.; Xue, Y.; Jin, N.; Yang, K. Chelating Agents in Assisting Phytoremediation of Uranium-Contaminated Soils: A Review. Sustainability 2022, 14, 6379. https://doi.org/10.3390/su14106379

AMA Style

You Y, Dou J, Xue Y, Jin N, Yang K. Chelating Agents in Assisting Phytoremediation of Uranium-Contaminated Soils: A Review. Sustainability. 2022; 14(10):6379. https://doi.org/10.3390/su14106379

Chicago/Turabian Style

You, Yue, Junfeng Dou, Yu Xue, Naifu Jin, and Kai Yang. 2022. "Chelating Agents in Assisting Phytoremediation of Uranium-Contaminated Soils: A Review" Sustainability 14, no. 10: 6379. https://doi.org/10.3390/su14106379

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