Abstract—Both traditional stone-like and novel microspheric ZnNiAl-layered double hydroxides (LDHs) were used as adsorbents for methyl orange removal from water. The stone-like ZnNiAl-LDH was synthesized by a coprecipitation method (c-LDH), and the microspheric ZnNiAl-LDH was prepared by a hydrothermal method (h-LDH). The special surface area of h-LDH (188.8 m2/g) is higher than that of c-LDH (71.0 m2/g), then h-LDH shows an excellent adsorption performance than c-LDH. The Al3+ content in microspheric ZnNiAl-LDH also has an impact on the adsorption capacity, which enhances with the Al3+ content increasing. The adsorption kinetics can be described with the pseudo-second-ordered model for both LDHs, and the adsorption isotherms of h-LDH can be fitted well by the Langmuir model, while the Freundlich model is better fit for c-LDH. The adsorption mechanisms for both LDHs are mainly attributed to ion exchange, electrostatic interaction and accompanied by surface complexation simultaneously.
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This research is supported by the Industry-University-Research (IUR) Project of Ministry of Education (202002292014), the Scientific Research Fund of Henan Provincial Education Department (22A610010, 21A150032) and the Science and Technology Project of Henan Province (212102310511, 212102210590).
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Cao, Y., Zhang, J., Zhou, P. et al. Effect of ZnNiAl-layered Double Hydroxide Morphology on Adsorption of Methyl Orange. Prot Met Phys Chem Surf 59, 133–142 (2023). https://doi.org/10.1134/S2070205123700314
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DOI: https://doi.org/10.1134/S2070205123700314