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›› 2012, Vol. 12 ›› Issue (2): 324-329.

• 材料工程专栏 • Previous Articles     Next Articles

Synthesis of Polyacrylamide Na-bentonite Composite and Its Adsorption to Lead Ion

DU Xiu-juan CAO Ji-lin CHEN Xue-qing ZHAO Jian-jun   

  1. Hebei Provincial Key Lab of Green Chemical Technology & High Efficient Energy Saving, School of Chemical Engineering & Technology, Hebei University of Technology Chemical Engineering School, Hebei University of Technology Chemical Engineering School, Hebei University of Technology Chemical Engineering School, Hebei University of Technology
  • Received:2012-01-06 Revised:2012-02-28 Online:2012-04-20 Published:2012-04-20
  • Contact: CAO Ji-lin

聚丙烯酰胺-钠基复合膨润土合成及其吸附铅离子性能

杜秀娟 曹吉林 陈学青 赵建军   

  1. 绿色化工与高效节能河北省重点实验室，河北工业大学化工学院 河北工业大学化工学院 河北工业大学化工学院 河北工业大学化工学院
  • 通讯作者: 曹吉林

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Abstract: Polyacrylamide Na-bentonite composite was prepared by continuous process in which Ca-bentonite was modified by NaCO3 and then polymerized with polyacrylamide in aqueous solution. The composite was characterized by XRD, SEM, IR and TG-DTG-DSC. The adsorption experiments of the composite to Pb2+ and admeasurement of acrylamide monomer were investigated. The results showed that acrylamide intervened and polymerized in the layers of bentonite. The composite bentonite presented a lamellar structure and had better stability. The adsorption capacity of Na-bentonite composite was better than that of powder bentonite and Ca-bentonite composite, and increase with the rise of bentonite content. The adsorption capacity of composite Na-bentonite containing 90% Na-bentonite was 118.35 mg/g. The adsorption of Na-bentonite composite to Pb2+ was corresponding with a second-order kinetic model.

Key words: Na-bentonite, acrylamide, polymerization, lead ion, adsorption

摘要： 以丙烯酰胺为聚合单体，钙基膨润土为主要原料，采用钠化改性及水溶液聚合连续工艺合成了系列复合膨润土，对其进行了表征，并考察了丙烯酰胺的溶出量和对Pb2+的吸附性能. 结果表明，丙烯酰胺在膨润土层间发生了插层聚合，复合膨润土为片层结构，稳定性较好. 复合膨润土对Pb2+的吸附量高于粉末膨润土和钙基复合膨润土，且吸附量随膨润土含量增加而增加，膨润土含量为90%的钠基复合膨润土对Pb2+的吸附量可达118.35 mg/g，吸附符合Lagergren二级动力学模型.

关键词: 钠基膨润土, 丙烯酰胺, 聚合反应, 铅离子, 吸附

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