Abstract
Layered double hydroxide (LDH) is of great interest for stabilizing toxic anions in the environment because its unique structure exposes numerous functional groups and high surface area and shows efficient ion-exchange capacity. However, little is known about the fundamental of the fluoride@LDH stabilization process to amend the contaminated soil, especially the underlying connection between stabilization efficiency and materials structure, which has never been addressed. Herein, Mg–Al LDH and its modified products, calcined LDH (C–LDH), sodium dodecylbenzenesulfonate intercalated LDH (SDBS–LDH), and diethylenetriaminepentaacetic acid intercalated LDH (DTPA–LDH), were synthesized by different methods and applied to the fluoride stabilization for polluted soil. The maximum stabilization capacity of C–LDH, SDBS–LDH, and DTPA–LDH was 713.33, 753.33, and 855.00 mg·g−1, respectively. Various characterization and analysis methods were utilized to elucidate the stabilization mechanism. Based on the kinetic and isotherm analyses, chemisorption dominated the stabilization process and mainly occurred in a monolayer on the well-distributed active sites of materials. For the two intercalation products, anion-exchangeable interlayer sites and surface functional groups contributed the most capacity for fluoride adsorption leading to an excellent performance. But for the C–LDH, the memory effect was predominant, resulting in fluoride intercalation in the reconstruction process of the brucite-like structure. Overall, the obtained results have a positive significance in revealing the role of LDH in the treatment of soil fluoride pollution.
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The data used in this study can be provided by the corresponding author on reasonable request.
References
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This study was supported by the State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization (2021P4FZG06A) and the Strategic Cooperation Project Between Sichuan University and Yibin Municipal Government (2019CDDYB-19).
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All authors contributed to the conception and design of this study. Material preparation, data collection, and analysis were performed by Dongling-Wang and Yuhan-Fu. Jinyan-Yang guided the writing of the article. The first draft of the manuscript was written by Dongling-Wang, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Wang, Dl., Fu, Yh. & Yang, Jy. Enhanced Fluoride Stabilization by Modified Layered Double Hydroxides for the Remediation of Soil Pollution: Performance and Mechanism. Water Air Soil Pollut 233, 471 (2022). https://doi.org/10.1007/s11270-022-05938-6
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DOI: https://doi.org/10.1007/s11270-022-05938-6