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Effect of Metal Cation Composition in Magnesium-Aluminum Layered Double Hydroxide during Adsorptive Removal of Cr(VI) from Aqueous Solution

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Abstract:

Layered double hydroxides (LDHs) have achieved remarkable attention these days for their promising applications ins water remediation, owing to their excellent anion exchange capacity and robust structured modification possibility. In this study, Mg-Al LDH of different metal ion ratio (2:1, 3:1 and 4:1) were synthesized by co-precipitation and urea hydrolysis method. The as synthesized LDHs were characterized by Fourier Transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy coupled with energy dispersive spectroscopy (SEM-EDX). A series of Cr (VI) removal efficacy were studied by batch adsorption method. The results indicated that removal of Cr (VI) from aqueous solution is pH dependent and a maximum Cr (VI) removal was achieved at pH 5. The Mg-Al LDH containing 2:1 metal ion ratio showed highest adsorption capacity irrespective of method of preparation. The equilibrium adsorption data are well supported by Langmuir isotherm (LI) and maximum loading capacities for Cr (VI) removal were 37.26 and 55.26 mg g−1 for LDH MAC-21 and MAU-21, respectively suggesting that LDH obtained by urea hydrolysis method have shown better performance. The equilibrium kinetics data are well supported by pseudo-second order model for all LDH tested samples.

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Periodical:

Solid State Phenomena (Volume 385)

Pages:

121-134

DOI:

https://doi.org/10.4028/p-PG7u9A

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Online since:

February 2026

Authors:

Netra Prasad Subedi, Kedar Nath Ghimire, Santosh Khanal*

Keywords:

CR (VI) Removal, Isotherm, Layered Double Hydroxides (LDHs), Sorption Capacity

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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