聚乙烯胺接枝cPVA海绵的制备及其Cu^(2+)吸附性能研究

Preparation and Cu^(2+)Adsorption Properties of Polyvinylamine Grafted Crosslinked Polyvinyl Alcohol Sponge

实验通过Ce^(4+)引发的氧化还原接枝聚合制备了聚丙烯酰胺接枝c PVA海绵(c PVA/PAM),并将其霍夫曼降解形成聚乙烯胺接枝cPVA海绵(cPVA/PVAm)。利用聚乙烯胺分子链上的大量-NH2活性位点形成具有高吸附容量、易于分离的重金属离子吸附材料。实验结果显示c PVA/PAM海绵的最佳制备工艺参数:AM单体浓度为0.6 mol/L,引发剂浓度为8 mmol/L,反应温度为45℃,反应时间为6 h;表面接枝聚乙烯胺显著提升了海绵的Cu^(2+)吸附性能,吸附平衡时间为120 min,Cu^(2+)吸附质量分数为60 mg/g;cPVA/PAM海绵对Cu^(2+)的吸附符合准二级动力学模型和Langmuir等温吸附模型。

In this study,polyacrylamide(PA M)grafted crosslinked polyvinyl alcohol(cPVA)sponge was prepared by a redox graft polymerization reaction using Ce^(4+) as initiator,then followed by the Hofmann degradation the Polyvinylamine(PVAm)grafted cPVA Sponge(cPVA/PVAm)was prepared.This heavy metal adsorption material possesses high adsorption capacity and facility to separation due to the large quantity of-NH2 on the molecular chain of PVAm.Results showed that the optimal preparation parameters of the cPVA/PAM is:AM concentration 0.6 mol/L,Ce^(4+) concentration 8 mmol/L,reaction temperature 45℃,and reaction time 6 h.The grafting of PVAm significantly improved the Cu^(2+) adsorption capacity of the cPVA sponge.Results showed that the Cu^(2+) adsorption capacity of 60 mg/g was achieved under the adsorption time of 120 min;the adsorption process follow the Lagergern second-order kinetic equation and Langmuir isotherm equation.