Ca^(2+)交联聚丙烯酸钠的合成及其对Pb^(2+)的吸附研究  

SYNTHESIS OF Ca^(2+) CROSSLINKED SODIUM POLYACRYLATE AND ITS ADSORPTION FOR Pb^(2+)

作　　者：曹荭 刘韩 程深圳 张帆 

机构地区：[1]吉首大学化学化工学院锰锌矿业重金属污染综合防治技术湖南省工程实验室湖南省锰锌钒产业技术2011协同中心,湖南吉首416000

出　　处：《离子交换与吸附》2017年第6期498-508,共11页Ion Exchange and Adsorption

基　　金：湖南省教育厅重点项目(15A150);国家自然科学基金(21566010);吉首大学2015年大学生研究性学习和创新性实验计划

摘　　要：利用溶液聚合法和Ca^(2+)表面交联法制备了Ca^(2+)交联的聚丙烯酸钠(CPAANa)。在25℃条件下,以CPAANa为吸附剂,开展了对Pb^(2+)的吸附研究工作,以FT-IR,SEM和TGA测试手段分析了吸附前后CPAANa样品的变化。吸附研究显示,CPAANa在p H值为2~5.5的范围内具有很好的吸附性能,对初始浓度低于300mg/L的Pb^(2+)废水可以达到99%以上的去除率。CPAANa对Pb^(2+)的吸附动力学符合准二级动力学模型,其等温曲线符合Langmuir吸附模型,由此得到的最大吸附量为650.34mg/g。由D-R模型得出的平均吸附自由能E=26.1k J/mol,表明CPAANa对Pb^(2+)的吸附属于化学吸附。重复利用实验显示,该材料具有较好的重复利用性能。Ca^2＋ crosslinked polyacrylate sodium （CPAANa） was prepared via solution polymerization. The CPAANa was used for adsorption of Pb^2＋ from aqueous solutions at 25℃, and the changes of CPAANa before and after adsorbed Pb^2＋ were characterized by FT-IR, SEM and TGA. The adsorbed experiments indicate that CPAANa has excellent adsorption performance for Pb^2＋ in the pH range of 2.0-5.5 and the CPAANa can remove more than 99% Pb^2＋ from wastewater when the initial Pb^2＋ concentration was below 300mg/L. The adsorption kinetics and isotherms of Pb^2＋ on CPAANa followed Pseudo-second-order model and Langmuir model, respectively. The maximum adsorption capacity of Pb^2＋ on CPAANa was calculated to be 650.34mg/g at 25℃ from Langmuir model. The values of mean free energy （E） for Pb^2＋ adsorption was calculated to be 26.1kJ/mol from D-R isotherm analysis, which means that the adsorption process of Pb^2＋ on CPAANa can be attributed to chemical adsorption. The regeneration test shows that the CPAANa possesses good reusability for the treatment of Pb^2＋ wastewater.

关 键 词：聚丙烯酸钠 Ca^2+表面交联 PB^2+ 吸附 

分 类 号：O647.3[理学—物理化学]