PP-g-GMA-DETA螯合纤维吸附处理含Pb2+废水

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Pb²⁺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Pb²⁺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 Pb²⁺质量浓度的增加,吸附量迅速上升,当初始Pb²⁺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Pb²⁺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。

Treatment of wastewater containing Pb2+ by adsorption with PP-g-GMA-DETA chelated fiber

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 Pb²⁺ mass concentration on adsorption quantity were investigated. The experimental results show thatThe adsorption rate of Pb²⁺ 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 Pb²⁺ mass concentration,the adsorption quantity increases rapidly till 60 mg/L of initial Pb²⁺ mass concentration and then slow down to the adsorption balance. The adsorption of Pb²⁺ 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.