Study On Adsorption Of Sn (Ⅳ) And Ce (Ⅲ) On TiO₂ Nanoparticles

The TiO2 nanoparticles showed efficient adsorption property toward metal ions because of its small size, big specific surface area and a lot of hydroxyl group, which could bond with metal ions. The Cr(Ⅲ), Cr(IV), As(Ⅲ), As(Ⅴ), Y and Yb ions could be efficient from waste solutions taking TiO2 nanoparticles as adsorbent. But the adsorption of Sn(Ⅳ) and Ce(Ⅲ) ions by anatase TiO2 nanoparticles has less reported.An efficient separation of the trace Sn(Ⅳ) was carried out taking TiO2 nanoparticles as adsorbent. The effects of the crystalline of TiO2 nanoparticles, pH values, mass of TiO2, initial concentration of Sn(Ⅳ) on the adsorption rate were systematically studied. The adsorption isotherm of Sn(Ⅳ) showed "s" type, which could be explained by the multi-molecular layer adsorption. The elution efficiency of the Sn(Ⅳ) adsorbed on TiO2 nanoparticles in 4.0 mol/L hydrochloric acid was more than 99%.An efficient separation of trace Ce(Ⅲ) was carried out using TiO2 nanoparticles as adsorbent. The effects of the crystalline of TiO2 nanoparticles, pH values, adsorption time, initial concentration of Ce(Ⅲ) and some coexistent ions on the adsorption rate were systematically studied. The optimum adsorption conditions were determined. The adsorption isotherm was obtained and the isotherm equation was implored based on Frendlich formula.0.3 mol/L Hydrochloric acid showed the highest elution efficiency.