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ABSTRACT
In this work, cobalt-aluminum-layered double hydroxide (CoAl) and its bentonite composite (Bent-CoAl) were utilized for adsorption of Cr(VI) from water. Incorporation of bentonite into layers of CoAl resulted in significant improvement in the adsorptive performance with increased BET surface area, without damaging LDH structure. The adsorption process was described by Freundlich isotherm and pseudo-second-order kinetic models. The mechanism of Cr(VI) sorption mainly involved electrostatic and chemical interactions with maximum Cr(VI) sorption value of 211.86 mg/g. This suggests that synergistic effect of bentonite into CoAl provided a superior adsorbent for decontamination of heavy metals.
Acknowledgments
The authors acknowledge the support provided by King Abdul-Aziz City for Science and Technology (KACST) under NSTIP through Project No. 12-Env2229-46 at the Imam Abdulrahman Bin Faisal University and King Fahd University of Petroleum & Minerals for providing the facilities for synthesis of the bentonite-CoAl in the Chemical engineering department. The authors also thank Mr. Iehab for the invaluable help he rendered for the Chromium analysis.
Supplementary material
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Correction Statement
This article has been republished with minor changes. These changes do not impact the academic content of the article.