Coating Iron Oxides on Kaolinite for the Adsorption of Fluoride

Wen Jun Xiang

doi:10.4028/www.scientific.net/AMR.479-481.250

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 479-481Coating Iron Oxides on Kaolinite for the...

Coating Iron Oxides on Kaolinite for the Adsorption of Fluoride

Abstract:

Iron oxides-coated kaolinite (Fe-Kaolinite) was prepared by co-precipitation and indentified using X-ray diffraction (XRD). Moreover, the surface properties and fluoride adsorption characteristics of Fe-Kaolinite were investigated and compared with those of kaolinite. Compared to kaolinite, the BET surface area and surface fractal dimension of Fe-Kaolinite increased significantly. The pH at zero point of charge (pHZPC) of kaolinite and Fe-Kaolinite was 3.16 and 6.24, respectively. In the suspensions of pH 6.0, the fitted maximum adsorption capacity (q_max) for fluoride of kaolinite and Fe-Kaolinite was 1.32 and 5.86 mg/g, respectively. The adsorption data for fluoride by Fe-Kaolinite could be fitted using Freundlich isotherm (R² =0.987), and Langmuir isotherm was very suitable for describing the fluoride adsorption of kaolinite (R2 =0.991).

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Advanced Materials Research (Volumes 479-481)

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250-254

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https://doi.org/10.4028/www.scientific.net/AMR.479-481.250

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February 2012

Authors:

Wen Jun Xiang

Keywords:

Adsorption, Fluoride, Iron Oxides, Iron Oxides-Coated Kaolinite, Kaolinite

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