Synthesis of titanate nanoparticles in low temperature hydrolysis and adsorption of arsenate (V) and fluoride

摘要

In this work, anatase titanium dioxide (TiO2) with surface area (167m(2)/g) and pore size diameters (17.8nm) was synthesized by low temperature one-step hydrolysis technique, and its adsorption abilities to arsenate and fluoride, the severe poisonous inorganic contamination in aqueous solution, were evaluated. TiO2 prepared at hydrolysis temperature of 80 degrees C and 0.2mol/L Ti(SO4)(2) concentration was optimum to remove As (V) and F-. Batch experiments showed that the adsorption of As (V) was more favored in the range of pH2.0-8.0, while the uptake of F- was preferred only at pH3.8. The maximum uptake calculated by Langmuir equation for As (V) and F- was 49.28mg/g (pH5.0) and 32.15mg/g (pH3.8), respectively. Ionic strength hardly has any effect on As (V) and F- removal. As (V) and F- kinetics study indicated that both the adsorption processes occurred rapidly; more than 82.6% of As (V) and 78.5% of F- could be adsorbed on TiO2 in the first 100min, but adsorption equilibrium was not obtained until 10h. Interference studies on the effects of