摘要
对辉光放电电解等离子体(GDEP)引发制备壳聚糖/聚丙烯酸(CS/PAA)水凝胶的机理进行了初步探讨,研究了CS/PAA对Pb^(2+)的吸附行为,详细考察了溶液pH、吸附时间和初始浓度对Pb^(2+)吸附量的影响,并对CS/PAA的再生和重复利用性进行了研究.同时,结合FT-IR和XPS表征,分析了CS/PAA吸附Pb^(2+)的作用机理.结果表明,CS/PAA对Pb^(2+)的吸附符合动力学准二级模型和Langmuir吸附等温式;在最佳吸附pH=5.1,吸附120 min时,CS/PAA对Pb^(2+)的最大理论吸附量为639.4mg·g-1;CS/PAA在0.015mol·L^(-1) EDTA-4Na溶液中具有优异的再生和重复利用性,其对Pb^(2+)的吸附存在离子交换和螯合作用.
The preparation mechanism of chitosan/poly（acrylic acid）（CS/PAA） hydrogel induced by glow-discharge electrolysis plasma（GDEP） technique is proposed , and the adsorption behavior of CS/PAA for Pb2＋ is systematically studied . The effects of the solution pH , contacted time and equilibrium concentration on the Pb^2＋ adsorption are investigated in detail . The reusability of CS/PAA is also discussed . Moreover , the adsorption mechanism of CS/PAA for Pb2＋ is analysized by FT-IR and XPS . The results showed that the adsorption of CS/PAA for Pb2＋ is agreed well with the Langmuir isotherm and pseudo-second-order adsorption kinetic model . The maximum adsorption capacity of Pb2＋ at pH=5.1 and 120 min is 639.4 mg·g^ -1 .Using 0.015 mol·L^ -1 EDTA-4Na as desorption solution ,the CS/PAA hydrogel has excellent regeneration and reusability . According to the FT-IR and XPS results , the adsorption of CS/PAA for Pb2＋ can be existed the coordination and ion-exchange .
出处
《西北师范大学学报（自然科学版）》
CAS
北大核心
2017年第4期61-67,共7页
Journal of Northwest Normal University(Natural Science)
基金
国家自然科学基金资助项目(21367023
21567025)
关键词
壳聚糖
水凝胶
吸附
吸附机理
PB^2+
chitosan（CS）
hydrogel
adsorption
adsorption mechanism
Pb^2＋
