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聚丙烯酰胺-钠基复合膨润土合成及其吸附铅离子性能
引用本文:杜秀娟,曹吉林,陈学青,赵建军.聚丙烯酰胺-钠基复合膨润土合成及其吸附铅离子性能[J].过程工程学报,2012,12(2):324-329.
作者姓名:杜秀娟  曹吉林  陈学青  赵建军
作者单位:河北工业大学化工学院.绿色化工与高效节能河北省重点实验室,天津,300130
基金项目:天津市科技支撑计划重点资助项目
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
收稿时间:2012-1-6
修稿时间:2012-2-28

Synthesis of Polyacrylamide Na-bentonite Composite and Its Adsorption to Lead Ion
DU Xiu-juan , CAO Ji-lin , CHEN Xue-qing , ZHAO Jian-jun.Synthesis of Polyacrylamide Na-bentonite Composite and Its Adsorption to Lead Ion[J].Chinese Journal of Process Engineering,2012,12(2):324-329.
Authors:DU Xiu-juan  CAO Ji-lin  CHEN Xue-qing  ZHAO Jian-jun
Affiliation:(Hebei Provincial Key Lab of Green Chemical Technology & High Efficient Energy Saving, School of Chemical Engineering & Technology, Hebei University of Technology, Tianjin 300130, China)
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.
Keywords:Na-bentonite  acrylamide  polymerization  lead ion  adsorption
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