科研之友
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摘要
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 0.5-1.0g/L, respectively. Initial Arsenic (As) (V) concentration ranged from 40 to 3,100g/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 r(2) ranging from 0.97 to 0.99. Kinetic study showed that pseudo-second order model best describes the adsorption rate with r(2) > 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 of distribution coefficient (K-d) values with other works showed that TiO2 nanoparticles have 33-2,533 times greater K-d values than other nanoparticles and commercial activated carbon. Therefore, TiO2 nanoparticles could provide a better solution for the synergistic removal of arsenic and metals from water.
- 出版日期2016-5
