Highly efficient removal of methyl orange in aqueous solutions by calcined-layered double hydroxides

Highly efficient removal of methyl orange in aqueous solutions by calcined-layered double hydroxides 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Highly efficient removal of methyl orange in aqueous solutions by calcined-layered double hydroxides

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Publisher
Springer Netherlands
Copyright
Copyright © 2014 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-014-1778-3
Publisher site
See Article on Publisher Site

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.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Aug 19, 2014

References

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