Layered double hydroxides as versatile materials for detoxification of hexavalent chromium: Mechanism, kinetics, and environmental factors
Nemati S.S. Dehghan G. Khataee A. Alidokht L. Kudaibergenov N.
December 2024Elsevier Ltd
Journal of Environmental Chemical Engineering
2024#12Issue 6
Hexavalent Cr (CrVI) compounds are a common environmental pollutant that causes carcinogenesis and interferes with the normal process of the cells. Layered double hydroxides (LDHs) as a class of ionic solids with hydroxylated metals in two layers and an intermediate layer containing water molecules and anions, e.g., CO32−, SO42−, Cl−, can be used for wastewater treatment, controlled drug delivery, pharmaceuticals, cosmetics, and electrochemical sensors. The use of LDHs to remove CrVI from aqueous environments has been considered because they have advantages such as biocompatibility and high efficiency. CrVI is converted to the less dangerous trivalent Cr (CrIII) by some of the LDHs, e.g., MgFe LDH, MgAl LDH, and NiFe LDH. In this review, after a summary of the LDHs principle, the main mechanisms of CrVI removal, including adsorption, interlayer ion exchange, and redox process, and the kinetics of CrVI removal have been described. The influential factors in CrVI removal efficiency by LDHs, including modification of LDHs, pH, and the effect of LDH interlayer anions, were reviewed in depth. The appropriate selection of interlayer anion, using intercalated LDHs, LDHs composite developing, as well as divalent and trivalent metals of LDHs, is effective in its performance; Also, modifying LDHs and preparing LDH-composites can improve the efficiency of removing CrVI.
Hexavalent chromium , Layered double hydroxides , LDH modifications , Pollutant removal , Trivalent chromium
Text of the article Перейти на текст статьи
Laboratory of Biochemistry and Molecular Biology, Department of Biology, Faculty of Natural Sciences, University of Tabriz, Tabriz, 51666−16471, Iran
Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, 51666−16471, Iran
Department of Chemical Engineering, Istanbul Technical University, Istanbul, 34469, Turkey
Environmental and Water Resource Engineering, Department of Civil and Environmental Engineering, University of Massachusetts Amherst, MA, United States
Department of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, al-Farabi 71, Almaty, 050038, Kazakhstan
Laboratory of Biochemistry and Molecular Biology
Research Laboratory of Advanced Water and Wastewater Treatment Processes
Department of Chemical Engineering
Environmental and Water Resource Engineering
Department of Chemistry and Chemical Technology
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026