聚丙烯酸盐-丙烯酰胺水凝胶的制备及对重金属离子吸附性能的研究

发布时间：2018-02-01 18:14

  本文关键词： 丙烯酸盐 丙烯酰胺 水凝胶 重金属离子 吸附　出处：《分析化学》2016年05期 　论文类型：期刊论文

【摘要】：以丙烯酸(AA)、丙烯酰胺(AM)为单体,K_2S_2O_8为引发剂,N,N'-亚甲基双丙烯酰胺为交联剂,采用水溶液聚合法合成P(AA-AM)水凝胶,通过正交实验优化了P(AA-AM)水凝胶的制备工艺。对制备的P(AA-AM)水凝胶进行了SEM和XPS分析,探讨了P(AA-AM)水凝胶对Cu~(2+)、Pb~(2+)、Zn~(2+)和Cd~(2+)的吸附等温线和吸附动力学行为,研究了P(AA-AM)水凝胶的粒径、吸附温度、p H值和重金属离子的初始浓度对P(AA-AM)水凝胶吸附性能的影响。实验结果表明,所制备的P(AA-AM)水凝胶是一种具有三维网络结构的高分子材料,其表面的氨基和羧基残基能够与重金属离子发生螯合反应。减小P(AA-AM)水凝胶粒径、增大溶液pH值、升高吸附环境温度均有利于吸附反应的进行。粒径为0.097~0.15 mm的P(AA-AM)水凝胶粉末,在35℃、p H=5的条件下进行吸附等温线实验,得到水凝胶对重金属Cu~(2+),Pb~(2+),Zn~(2+)和Cd~(2+)的理论最大吸附量分别为186,588,208和403 mg/g。P(AA-AM)水凝胶对重金属离子的吸附符合准二级动力学模型(R~20.98),吸附等温线符合Langmuir吸附等温线(R~20.95)。干扰离子实验和理论模拟均证明P(AAAM)水凝胶对Pb~(2+)具有良好的吸附性。
[Abstract]:In this paper, the initiator of AA-A, AM) was used as the initiator, and the initiator was NNT-methylene bisacrylamide as the crosslinking agent, and K2S2O8 was used as the initiator. The aqueous solution polymerization method was used to synthesize PnAA-AMN hydrogels. The preparation process of PnAA-AM-based hydrogel was optimized by orthogonal experiment, and the SEM and XPS analysis of the prepared hydrogel was carried out. The adsorption isotherms and adsorption kinetics of Cu~(2 and Cd~(2) hydrogels were studied. The effects of particle size, adsorption temperature, pH value and initial concentration of heavy metal ions on the adsorption properties of PnAA-AMN hydrogels were studied. The prepared AA-AMN hydrogel is a kind of polymer material with three-dimensional network structure. The amino and carboxyl residues on the surface can chelate with heavy metal ions, decrease the particle size of PnAA-AMN hydrogel, and increase the pH value of the solution. The adsorption reaction was facilitated by increasing the temperature of adsorption environment, and the hydrogel powder with a particle size of 0.097 ~ 0.15 mm was obtained at 35 鈩，

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