Abstract
Zn–Al-layered double hydroxides were firstly prepared and then dehydrated to calcined-layered double hydroxides (c-LDHs) by annealing at elevated temperature. The structure, surface area, and adsorption properties of the prepared samples were studied. The results show that the surface area of the c-LDHs is enlarged compared to their precursors, which is favorable for the adsorption of methyl orange (MO). The optimum pH for the adsorption of MO ranges from 4 to 9. In such conditions, MO can be adsorbed on the surface and inserted into the layers of the adsorbent, thus the c-LDHs possess high adsorption capacity even at low MO concentration. The adsorption process can be well described by the pseudo-second-order kinetic model, and the adsorption isotherm of MO on the c-LDHs follows the Langmuir equation. The adsorption mechanism of MO on the c-LDHs and the recycling adsorption performance of the c-LDHs are also discussed.
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The authors thank the National Natural Science Foundation of China (No. 21273080 and 21043005) for financial support.
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Zheng, YM., Xiong, L. & Zhang, WD. Highly efficient removal of methyl orange in aqueous solutions by calcined-layered double hydroxides. Res Chem Intermed 41, 6803–6814 (2015). https://doi.org/10.1007/s11164-014-1778-3
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DOI: https://doi.org/10.1007/s11164-014-1778-3