Efficient removal of Cr (VI) from aqueous solution using memory effect property of layered double hydroxide material

被引：1

作者：

Benhiti R. ^{[1
]}

Ait Ichou A. ^{[1
]}

Aboussabek A. ^{[1
]}

Carja G. ^{[2
]}

Zerbet M. ^{[1
]}

Sinan F. ^{[1
]}

Chiban M. ^{[1
]}

机构：

[1] Laboratory of Applied Chemistry and Environment, Department of Chemistry, Faculty of Sciences, Ibnou Zohr University, Agadir

[2] Laboratory of Materials Nanoarchitectonics, Faculty of Chemical Engineering and Environment Protection, Technical University of ‘Gheorghe Asachi’ of Iasi

来源：

Chemosphere | 2023年 / 341卷

关键词：

Chromium; Layered double hydroxide; Memory effect; Sorption; Wastewater treatment;

D O I：

10.1016/j.chemosphere.2023.140127

中图分类号：

学科分类号：

摘要：

Treating wastewater containing pollutants with layered double hydroxide (LDH) material attracts excellent interest. LDH materials are known by the memory effect property, which leads to the reconstruction of the LDH structure after its calcination and rehydration. In this study, LDH material was prepared, calcined, and then rehydrated in an aqueous Cr(VI) solution. XRD, FTIR, and SEM-EDS analysis confirm the successful reconstruction of LDH-loading chromium on its surface and layered space. Response surface methodology (RSM) results showed that LDH mass, contact time, and chromium concentration are the main factors controlling the removal of Cr(VI). The heterogeneous sorption of chromium was described by fitting the equilibrium data to the Freundlich model. Analytical techniques, thermodynamic data, activation, and adsorption energies confirm that the removal process of Cr(VI) is endothermic, spontaneous, and physical nature. LDH exhibits good reusability performance with only a 7% reduction of initial adsorption capacity after five cycles of the calcination-rehydration process. These results show that the memory effect of LDH is helpful for the intercalation and the removal of emergent pollutants, especially for wastewater treatment. © 2023 Elsevier Ltd

引用

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