采用低温水解法制备纳米TiO2,研究了纳米TiO2吸附剂对氟离子的吸附行为,考察了硫酸钛浓度、纳米TiO2投加量、pH值和接触时间对吸附氟离子的影响.结果表明,硫酸钛浓度为0.20 mol/L时得到的纳米TiO2对氟离子吸附效果最好；纳米TiO2的吸附量随溶液pH值的升高而下降,当pH值为4.0时最大吸附量为28.8 mg/g；100 min内纳米TiO2对氟离子的吸附率可以达到78.5％；吸附动力学研究表明,纳米TiO2对氟离子的吸附动力学可以用准二级动力学方程来描述,吸附过程符合Langmuir等温吸附模型.%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.
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