Adsorption performance of nanocrystalline TiO_2 to fluoride ions

Using low temperature hydrolysis method to prepare nanocrystalline TiO2,the adsorption behavior of nanocrystalline TiO2 adsorbent to fluoride ions was studied.The influences of titanium sulfate concentration,nanocrystalline TiO2 dosage,pH value and contact time on fluoride ions removal were investigated.The results of the test showed that,the best adsorption performance of nanocrystalline TiO2 to fluoride ions was obtained when the titanium sulfate concentration was 0.20 mol/L;the adsorption quantity of nanocrystalline TiO2 decreased with the increasing of pH value,and the maximum adsorption quantity reached 28.8 mg/g when the pH value was 4.0;the adsorption rate of nanocrystalline TiO2 to fluoride ions could obtain 78.5% within 100 min.According to the study of adsorption kinetics,the adsorption kinetics of nanocrystalline TiO2 to fluoride ions could be described by pseudo second-order kinetic model,and the adsorption procedure fitted Langmuir isothermal adsorption model.