Adsorption of Arsenite(III) and Arsenate(V) from Drinking Water Using Amorphous and Anatase Titanium Dioxide as the Adsorbent

Abstract:

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Arsenite(III) and arsenate(V) removal from low-arsenic concentration drinking water by amorphous and anatase TiO2 adsorbents were studied in this paper. X-ray diffraction (XRD) and BET surface area analysis were used to characterize the physical and chemical properties of the adsorbents. Pore size calculated from adsorption average pore width (4V/A by BET) is 3.92 nm of amorphous TiO2 and 11.0 nm of anatase TiO2. The BET surface specific area of amorphous TiO2 was found to be 205 m2/g and anatase TiO2 was 115.6 m2/g, respectively. Amorphous TiO2 shows more efficiency than anatase TiO2 for As(III) and As(V) removal. About 80% of As(V) and 60% of As (III) can be removed within 2h reaction when dosage of amorphous TiO2 was only 0.1g/L. High temperature can facilitate the adsorption of As(V) but exhibit no obviously influence on As(III). Adsorption kinetics data were found to be best described by the modified pseudo-second-order kinetics model which can be described by Equation 1/(Qe-Qt)-1/Qe=k∙tn for arsenite(III) and arsenate(V) removal.

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Periodical:

Edited by:

Dongye Sun, Wen-Pei Sung and Ran Chen

Pages:

447-450

DOI:

10.4028/www.scientific.net/AMM.71-78.447

Citation:

Y. C. Tang et al., "Adsorption of Arsenite(III) and Arsenate(V) from Drinking Water Using Amorphous and Anatase Titanium Dioxide as the Adsorbent", Applied Mechanics and Materials, Vols. 71-78, pp. 447-450, 2011

Online since:

July 2011

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$35.00

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