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研究了用改性梧桐落叶作生物吸附剂去除地下水中的氟离子,考察了溶液pH、氟离子初始质量浓度、反应时间对氟离子去除率的影响,并采用Box-Behnken响应面法对吸附条件进行优化。实验结果表明,当pH为2.00、氟离子初始质量浓度为20.00mg/L、反应时间为60.01min时,氟离子的最大去除率可达88.63%。与Freundlich方程相比,Langmuir方程对实验数据的拟合结果更好,氟离子最大吸附量为98.04mg/g。准二级吸附动力学方程能更好地拟合实验数据,说明吸附过程以化学吸附为主。热力学分析结果表明,该吸附过程是一个自发吸热过程,升高温度有利于吸附反应的进行。
The effect of solution pH, the initial concentration of fluoride ion and reaction time on the fluoride ion removal rate was studied. The effect of adsorption conditions on the adsorption capacity of fluoride was studied by Box-Behnken response surface methodology optimize. The experimental results show that the maximum fluoride ion removal efficiency is 88.63% when the initial concentration of fluoride ion is 20.00mg / L and the reaction time is 60.01min at pH 2.00. Compared with the Freundlich equation, the fitting results of the Langmuir equation to the experimental data are better, and the maximum adsorption capacity of fluoride ion is 98.04mg / g. Quasi-two adsorption kinetics equation can better fit the experimental data, indicating that the adsorption process based on chemical adsorption. Thermodynamic analysis results show that the adsorption process is a spontaneous endothermic process, the temperature is conducive to the adsorption reaction.