聚乙烯亚胺改性磁性膨润土对Pb^(2+)和Cu^(2+)的吸附性能  

Adsorption properties of polyethyleneimine modified magnetic bentonite for Pb^(2+)and Cu^(2+)

作　　者：孙志勇[1] 王智懿[1] 张娇[1] 马向荣[2] SUN Zhiyong;WANG Zhiyi;ZHANG Jiao;MA Xiangrong(School of Energy Engineering,Yulin College,Yulin 719000,Shaanxi,China;School of Chemistry and Chemical Engineering,Yulin College,Yulin 719000,Shaanxi,China)

机构地区：[1]榆林学院能源工程学院,陕西榆林719000 [2]榆林学院化学与化工学院,陕西榆林719000

出　　处：《精细化工》2021年第1期169-175,191,共8页Fine Chemicals

基　　金：国家自然科学基金(52064048);陕西省科技厅项目(2019SF-271);陕西省科技资源开发共享平台项目(2019PT-18)。

摘　　要：在磁性膨润土(MBent)表面接枝聚乙烯亚胺(PEI)制备了聚乙烯亚胺改性磁性膨润土(PEI/KH560/MBent),采用FTIR、VSM、XRD、TGA、EA、SEM和EDS对其进行了表征,考察了其对水溶液中Pb^(2+)和Cu^(2+)的吸附性能。结果表明,聚乙烯亚胺已成功接枝于磁性膨润土表面,并有效提高了其对Pb^(2+)和Cu^(2+)的吸附量;溶液初始pH对吸附量影响较大,随着pH的增大,吸附量增加。在pH=5,溶液初始质量浓度为300mg/L,PEI/KH560/MBent对Pb^(2+)和Cu^(2+)吸附量分别为96.21和61.08mg/g;吸附过程符合准二级动力学模型,吸附行为符合Langmuir吸附等温模型。热力学研究表明,吸附为自发吸热过程。经过5次循环利用后,其吸附容量仍保持初始的60%以上,表明PEI/KH560/MBent具有一定的重复利用性。Polyethyleneimine modified magnetic bentonite(PEI/KH560/MBent)was prepared by grafting polyethyleneimine(PEI)on the surface of magnetic bentonite(MBent)and characterized by FTIR,VSM,XRD,TGA,EA,SEM and EDS.The adsorption performance of PEI/KH560/MBent for Pb^(2+)and Cu^(2+)in aqueous solution was studied.The results showed that polyethyleneimine was successfully grafted onto the surface of magnetic bentonite and effectively increased the adsorption capacity for Pb^(2+)and Cu^(2+).The initial pH of solution had a great influence on the adsorption capacity.When the pH increased,the adsorption capacity increased.Under the conditions of pH=5 and the initial concentration of the solution of 300 mg/L,the adsorption capacities of PEI/KH560/MBent for Pb^(2+)and Cu^(2+)were 96.21 and 61.08 mg/g,respectively.The adsorption process was in line with the quasi-second-order kinetic model,and the adsorption behavior was consistent with the Langmuir adsorption isotherm model.The results of thermodynamic studies indicated that the adsorption was a spontaneous endothermic process.After 5 cycles of recycling,the adsorption capacity remained above 60%of the original,indicating that PEI/KH560/MBent had certain reusability.

关 键 词：聚乙烯亚胺 膨润土 Pb^(2+) Cu^(2+) 吸附 功能材料 水处理技术 

分 类 号：X703[环境科学与工程—环境工程] TQ424[化学工程]