Adsorption of Arsenite(III) and Arsenate(V) from Drinking Water Using Amorphous and Anatase Titanium Dioxide as the Adsorbent
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.
Dongye Sun, Wen-Pei Sung and Ran Chen
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