| A lot of waste water with metal ions can be produced in many areas, such as in mining, electroplating, chemical analysis laboratory and other industries. If the waste water with metal ions was directly discharged into the nature, the environment wuold be polluted and the resources is waste. The traditional recycling method of waste water containing metal ions had some disadvantage, for example, consuming much more energy, bringing secondary pollution, and so on. Recently, TiO2 nanparticles were considered a prospective adsorbent in the waster water treatment for its active surface properties, higher dispersity, stable, good renewable performance, inexpensive and other advantages.An efficient preconcentration of trace Pb(Ⅱ) was carried out by using TiO2 nanoparticles as adsorbent. The effect of the structure of TiO2 nanoparticles, pH values, adsorptive time, initial concentration of Pb(Ⅱ), on the adsorptive efficiency was systematically studied. The adsorption isotherm was obtained and the isotherm equation was implored based on Frendlich formula.The [S2O3]2- anion was used as ligand to preconcentrate Ag(I) by TiO2 nano-adsorbrnt. The effect of the structure of TiO2 nanoparticles, pH values, adsorptive time, initial concentration of Ag(Ⅰ), and some coexistent ion on the adsorptive efficiency was systematically studied. The FT-IR spectrum showed that the coordination compound of Ag(Ⅰ) was physically adsorbed on the surface of TiO2 nanoparticles. The adsorption isotherm of Ag(Ⅰ) on nano-TiO2 was "s" type, which could 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 (lmol/L) and sulfourea (2g/L). |
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