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- In relation to this article, we declare that there is no conflict of interest.
- Publication history
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Received July 12, 2023
Accepted August 13, 2023
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Industrial Solid Waste-Based Layered Double Hydroxide Composite with Enhanced Adsorption Affi nity to Congo Red, Acid Red, and Reactive Red
Abstract
The synthesis of hierarchically porous materials from industrial solid waste as catalysts or adsorbents has attracted much
attention in environmental pollution control. The present work highlights the synthesis of a series of MgFeAl layered double
hydroxide (LDH) with diff erent ratios of Mg/(Fe + Al) from red mud and ferronickel slag under diff erent pH to decolorize
three red dye solutions, namely, Congo red (CR), acid red (AR), and reactive red (RR). The maximum adsorption capacity
(386.1 mg.g −1 ) for CR was obtained by the MgFeAl-LDH sample with Mg/(Fe + Al) mole ratio of 2 synthesized under pH
10. The optimized synthesis parameters led to a high surface area and large pore volume of MgFeAl-LDH, thereby enhancing
the mass transfer of adsorbate to the active sites of the adsorbent. Further, the MgFeAl-LDH sample was also effi cient
in removing AR (120.9 mg.g −1 ) and RR (114 mg.g −1 ). Moreover, the adsorption kinetics and isotherms of MgFeAl-LDH
fi tted well with the pseudo-second-order and Langmuir models, respectively. The MgFeAl-LDH system developed a valuable
approach to utilize industrial waste for dye removal.
