Abstract: Calcined Mg/Al hydrotalcites has been applied for the simultaneous removal of fluoride and hardness from micro-polluted water. The main factors which affecting the removing rates of fluoride and hardness have been selected by Plackett-Burman experimental design,optimized by Box-Behnken experimental design of response surface method,and the regression models obtained. The results show that pH,reaction time and calcined Mg/Al hydrotalcites dosage have significant influences on the removing rates of both fluoride and hardness. The optimal adsorption conditions are as follows:pH=9.40,reaction time 239.33 min,and calcined Mg/Al hydrotalcites dosage 5.61 g/L. Under these optimum conditions,the removing rates of fluoride and hardness are 97.55% and 58.09% respectively.

Key words: calcined Mg/Al hydrotalcites, fluoride, hardness, response surface method

摘要： 采用焙烧Mg/Al水滑石同时去除微污染水体中的F^-和硬度。通过Plackett-Burman实验设计选出影响F^-和硬度去除率的主要因素，利用响应面法中Box-Behnken实验设计进行优化设计并得到回归模型。结果表明，pH、反应时间、焙烧Mg/Al水滑石投加量对F^-和硬度的去除率均有显著影响，最佳吸附条件：pH为9.40，反应时间为239.33 min，焙烧Mg/Al水滑石投加量为5.61 g/L。在此最优条件下，F^-和硬度的去除率分别为97.55%、58.09%。

关键词: 焙烧Mg/Al水滑石, 氟离子, 硬度, 响应面法

CLC Number: 

• X703

• R123