硫酸铝壳聚糖改性沸石分子筛除氟的性能研究  

On defluorination performance of molecular sieve of aluminum sulfate chitosan modified zeolite

作　　者：郜玉楠[1] 包顺宇 茹雅芳 李懋锋 GAO Yu-nan;BAO Shun-yu;RU Ya-fang;LI Mao-feng(School of Municipal and Environmental Engineering,Shenyang Jianzhu University,Shenyang 110168,China)

机构地区：[1]沈阳建筑大学市政与环境工程学院,沈阳110168

出　　处：《安全与环境学报》2020年第3期1105-1111,共7页Journal of Safety and Environment

基　　金：国家自然科学基金项目(51508342)。

摘　　要：使用硫酸铝壳聚糖改性沸石分子筛复合吸附颗粒(简称复合吸附颗粒)去除水中的F^-,控制颗粒投加量、时间、pH值与温度优化最佳工艺条件,研究复合吸附颗粒吸附性能,并通过SEM、EDS和FTIR对吸附剂的结构和形貌进行分析。结果表明,投加量、时间和pH值为影响复合吸附颗粒除氟的主要因素。吸附F^-的过程符合准二级动力学模型,拟合系数为0. 999 9,Freundlich吸附等温线可以更好地描述对F^-的吸附,吸附热力学中吉布斯自由能和焓均小于0,表明吸附F^-的过程是自发放热过程。复合吸附颗粒对F^-具有良好的吸附效果,可实现饮用水的脱氟净化。The given paper is to make a discussion of the adsorptive effect and adsorption mechanism of the composite adsorption particles on the fluoride ions. For the above said adsorptive effect and adsorption mechanism of the composite adsorption particles,the composite adsorption particles have to be synthesized through the molecular sieves of the chitosan and aluminum sulfate modified polymers so as to determine the adsorption performance of the composite adsorption particles on the testing basis. Thus,it can be seen that given paper has to include the effects of the dosage of adsorbent,the adsorption time,the pH value and the temperature on the adsorption rate,as well as on the properties of the adsorption kinetics,the adsorption isotherm as well as the adsorption thermodynamics. And,eventually,given test has also to explore the adsorption mechanism by using the SEM,EDS and FTIR methods. The results of our research have thus demonstrated that,when the dosage is 2 g/100 mL,the adsorption capacity and the removal rate of the fluoride ion by the composite adsorption particles turn out to be 0. 23 mg/g and 90. 10%,respectively. And,on the condition when the adsorption time prolongs for 8 hours,it would be possible for the adsorption equilibrium to be almost arrived at,so as for the adsorption amount and the removal rate to get at 0. 24 mg/g and 94. 62%. On the other hand,the said adsorption equilibrium would make a great influence on the adsorption effect of the fluoride ions at the said high pH value,which implies to be an efficient adsorption range of the adsorbent in water,though the temperature has just had little effect on the adsorption of the fluoride ions. In addition,when it is at the temperature of 15 ℃,the fluoride removal would make the best,or the optimistic effect,with the adsorption and removal rates being at 0. 23 mg/g and 91. 70%. The adsorption behavior of the composite ions on the fluoride ions can best be described in the quasi-second-order kinetic model (R2=0. 9999), whereas the adsorption process

关 键 词：环境工程学 硫酸铝 壳聚糖 沸石分子筛 吸附 氟 

分 类 号：X523[环境科学与工程—环境工程]