Abstract
Abstract Adsorption of arsenate on titanium dioxide nanoparticles and bulk particles was studied at pH 4.5 and 7. Nanoparticle and bulk particle concentrations were 0.1–0.5 and 0.5–1.0 g/L, respectively. Initial Arsenic (As) (V) concentration ranged from 40 to 3,100 μg/L. Nanoparticles adsorbed more As (V) when normalized by mass, and bulk particles adsorbed more As (V) when normalized by surface area. At the same initial As (V) concentration, more As (V) was adsorbed at pH 4.5 than at pH 7. Adsorption data were best fitted with Freundlich isotherm model with r2 ranging from 0.97 to 0.99. Kinetic study showed that pseudo-second order model best describes the adsorption rate with r2 > 0.99. Simultaneous adsorption of single (As) and multiple metals (Zn, Cd, Pb) in San Antonio tap water was studied. Presence of multiple metals did not compete for As (V) adsorption sites in San Antonio tap water. The kinetic study showed an increased adsorption rate of As (V) in the presence of coexisting metals. Comparison ...
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