Adsorption of Coordination Compound of Ag(I) on TiO2 Nanoparticles

An efficient separation of coordination compound of Ag(I) was carried out taking TiO2 nanoparticles as adsorbent, [S2O3](2-) anion as ligand and Flame Atomic Absorption Spectrophometer(FAAS) as detector to determine the concentration of Ag( I). The effect of the crystalline structure of TiO2 nanoparticles, pH values, adsorption time, initial concentration of Ag( and some coexistent ion on the adsorption rate was systematically studied. The FTIR spectrum show that the coordination compound of Ag(I) is physically adsorbed on the surface of TiO2 nanoparticles. The adsorption isotherm of Ag(I) on nano-TiO2 show "S" type, which can be explained by the multi-molecular layer adsorption. The Ag(I) adsorbed on TiO2 nanoparticles could be eluted completely by mixed solution of nitric acid(1 mol/L) and sulfourea(2 g/L). The above experiment results would be valuable for using the nano-adsorbents to separate trace Ag(I) in waste water.