Graphene oxide–aluminium oxyhydroxide interaction and its application for the effective adsorption of fluoride

A novel aluminium oxy hydroxide [Al-O(OH)] modified graphene oxide was prepared by a chemical precipitation method wherein Al super(3+) ions could interact effectively with the different functional groups of graphene oxide (GO). The prepared (GO-Al-O(OH) adsorbent was tested for the effective defluo...

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Bibliographic Details
Published in:RSC advances 2014-01, Vol.4 (96), p.53711-53721
Main Authors: Barathi, M., Krishna Kumar, A. Santhana, Kumar, Chinta Uday, Rajesh, N.
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Aluminum
Ammonium hydroxide
Fluorides
Graphene
Oxides
X-ray photoelectron spectroscopy
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Summary:A novel aluminium oxy hydroxide [Al-O(OH)] modified graphene oxide was prepared by a chemical precipitation method wherein Al super(3+) ions could interact effectively with the different functional groups of graphene oxide (GO). The prepared (GO-Al-O(OH) adsorbent was tested for the effective defluoridation of water. The Al super(3+) modified graphene oxide adsorbent was characterized using FT-IR, FT-Raman, SEM-EDS, XRD and XPS studies. The thermodynamically feasible adsorption is supported by the pseudo second order kinetics and a high Langmuir maximum adsorption capacity (51.42 mg g super(-1)) for the GO-Al-O(OH) adsorbent. Furthermore, we could treat 2.0 L of 5.0 mg L super(-1) fluoride ion solution to bring the level within the permissible limits and the regeneration of the adsorbent was done using ammonium hydroxide.
ISSN:2046-2069
2046-2069
DOI:10.1039/C4RA10006A