PP-g-GMA-DETA螯合纤维吸附处理含Pb^2+废水  

Treatment of wastewater containing Pb^2+ by adsorption with PP-g-GMA-DETA chelated fiber

作　　者：朱冬梅 许懿杨 余晨月 邵芝祥 连洲洋 魏无际 ZHU Dongmei;XU Yiyang;YU Chenyue;SHAO Zhixiang;LIAN Zhouyang;WEI Wuji(School of Environmental Science and Engineering,Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]南京工业大学环境科学与工程学院,江苏南京211816

出　　处：《化工环保》2020年第3期297-302,共6页Environmental Protection of Chemical Industry

基　　金：国家自然科学基金项目(21676144)。

摘　　要：采用低温等离子体技术将甲基丙烯酸缩水甘油酯(GMA)接枝在聚丙烯(PP)纤维表面,再用二乙烯三胺(DETA)胺化,制得PP-g-GMA-DETA螯合纤维,并应用于含铅模拟废水的处理。考察了吸附时间、溶液pH和初始Pb^2+质量浓度对吸附量的影响。实验结果表明:PP-g-GMA-DETA螯合纤维对Pb^2+的吸附速率很快,15 min时基本达到平衡吸附量,约为24.83 mg/g;随溶液pH的增加吸附量先迅速升高后保持平稳,在溶液pH为5.0时达到25.37 mg/g;随初始Pb^2+质量浓度的增加,吸附量迅速上升,当初始Pb^2+质量浓度达到60 mg/L后,吸附量增长缓慢,最终保持吸附平衡。PP-g-GMA-DETA螯合纤维对Pb^2+的吸附符合Langmuir等温吸附模型,是典型的单分子层吸附,饱和吸附量为31.40 mg/g。By grafting glycidyl methacrylate(GMA)onto the surface of polypropylene(PP)fiber and aminating with diethylenetriamine(DETA),PP-g-GMA-DETA chelated fiber was prepared and applied in treatment of lead-containing simulated wastewater.The effects of adsorption time,solution pH and initial Pb^2+mass concentration on adsorption quantity were investigated.The experimental results show that:The adsorption rate of Pb^2+on PP-g-GMA-DETA chelated fiber is very fast and the equilibrium adsorption quantity(about 24.83 mg/g)is basically reached in 15 min;With the increase of solution pH,the adsorption quantity first rise rapidly and then remained stable,and reaches 25.37 mg/g at solution pH 5.0;With the increase of initial Pb^2+mass concentration,the adsorption quantity increases rapidly till 60 mg/L of initial Pb^2+mass concentration and then slow down to the adsorption balance.The adsorption of Pb^2+on PP-g-GMA-DETA chelated fiber conforms to the Langmuir isothermal adsorption model,which is a typical monolayer adsorption with a saturated adsorption capacity of 31.40 mg/g.

关 键 词：聚丙烯 等离子体 接枝 螯合纤维 吸附 PB^2+ 

分 类 号：X703[环境科学与工程—环境工程]