Preparation and characterization of porous granular ceramic containing dispersed aluminum and iron oxides as adsorbents for fluoride removal from aqueous solution

Porous granular ceramic adsorbents containing dispersed aluminum and iron oxides were synthesized by impregnating with salt solutions followed by precipitation at 600°C. In the present work detailed studies were carried out to investigate the effect of contact time, adsorbent dose, initial solution...

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Bibliographic Details
Published in:Journal of hazardous materials 2011-02, Vol.186 (1), p.863-868
Main Authors: Chen, Nan, Zhang, Zhenya, Feng, Chuanping, Zhu, Dirui, Yang, Yingnan, Sugiura, Norio
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Adsorption isotherms
Adsorption kinetics
Aluminum
Aluminum - chemistry
anions
Applied sciences
aqueous solutions
Ceramics
Chemical engineering
Dispersion
Exact sciences and technology
Fluoride removal
Fluorides
Fluorides - isolation & purification
Hydrogen-Ion Concentration
iron
Iron - chemistry
iron oxides
Microscopy, Electron, Scanning
Oxides - chemistry
particle size
Pollution
Porous granular ceramic
scanning electron microscopy
Solutions
sorption isotherms
surface area
Surface chemistry
Water
X-Ray Diffraction
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Summary:Porous granular ceramic adsorbents containing dispersed aluminum and iron oxides were synthesized by impregnating with salt solutions followed by precipitation at 600°C. In the present work detailed studies were carried out to investigate the effect of contact time, adsorbent dose, initial solution pH and co-existing anions. Characterization studies on the adsorbent by SEM, XRD, EDS, and BET analysis were carried out to clarify the adsorption mechanism. The adsorbents were sphere in shape, 2–3mm in particle size, highly porous and showed specific surface area of 50.69sqm/g. The fluoride adsorption capacity of prepared adsorbent was 1.79mg/g, and the maximum fluoride removal was obtained at pH 6. Both the Langmuir and Freundlich isotherm models were found to represent the measured adsorption data well. The experimental data were well explained with pseudo-second-order kinetic model. Results from this study demonstrated potential utility of Al/Fe dispersed in porous granular ceramics that could be developed into a viable technology for fluoride removal from aqueous solution.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2010.11.083