聚吡咯/尼龙6纳米纤维膜对Pb^(2+)固相萃取的吸附效能研究  

Research on Adsorption of Pb^(2+) from Aqueous Solutions Using Polypyrrole/Nylon 6 Nanofibers Mat

作　　者：刘静静[1,2] 李晓晴[1,2] 崔梦晶[1,2] 戎非[3] 许茜[1,2,3] 

机构地区：[1]东南大学公共卫生学院,南京210009 [2]东南大学环境医学工程教育部重点实验室,南京210009 [3]东南大学苏州市环境与生物安全重点实验室,南京215123

出　　处：《分析化学》2016年第1期138-145,共8页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金项目(Nos.81172721;81473019);苏州市纳米技术专项项目(No.ZXG2013026)资助~~

摘　　要：以电纺尼龙6纳米纤维膜为基底,原位氧化聚合制得聚吡咯/尼龙6纳米纤维膜(PPy/Nylon 6-NFsM)。通过静态和动态吸附实验考察PPy/Nylon 6-NFsM对pb^(2+)的吸附行为,探究其作为固相萃取介质富集水中痕量pb^(2+)的可行性。结果表明:298 K,pH=10时,PPy/Nylon 6-NFsM对pb^(2+)的静态饱和吸附量达542 mg/g;吸附动力学和吸附等温线分别符合准二级动力学模型和Freundlich模型;优化了PPy/Nylon 6-NFsM的固相萃取条件,采用火焰原子吸收光谱法检测实际水样中的pb^(2+),检出限为1.2μg/L(信噪比为3计)10μg/L加标水平加标回收率为95.3%~100.4%,相对标准偏差(RSD)为1.6%(n=3)可实现实际水样中痕量Pb^(2+)的准确、灵敏的检测。Polypyrrole/Nylon 6 core-shell Nanofibers mat（PPy/Nylon 6-NFSM）,prepared via situ polymerization on nylon6 electrospun nanofibers mat template,was used as an adsorbent to remove Pb^2＋ from aqueous solutions.To study the adsorption characteristics of PPy/Nylon 6-NFSM on Pb^2＋,the work focused on two parts,dynamic adsorption and static adsorption.The investigation explored the possibility of PPy/Nylon 6-NFSM as an efficient solid phase extraction（SPE） adsorbent for the separation and enrichment of trace Pb^2＋ in water samples.The experiment results showed that the maximum static adsorption capacity of PPy/Nylon 6-NFSM for Pb^2＋ was 542.1 mg/g at 298 K in pH=10 solution.The adsorption process could be well fitted with the pseudo-second-order kinetic model,the adsorption equilibrium data accorded with Freundlich isotherm model.Under the optimum conditions,PPy/Nylon 6-NFSM was used as adsorbent in SPE coupled with Flame atomic spectrophotometer（AA-7000） for the determination of Pb^2＋ in water samples.The limits of detection of the method were 1.2 μg/L（S/N=3）,the recoveries of spiked water samples at concentration of 10 μg/L were 95.3%-100.4%with RSD of 1.6%.The method is accurate and sensitive in detection of trace concentrations of Pb^2＋ in water sample.

关 键 词：聚吡咯/尼龙6纳米纤维膜 铅 吸附 固相萃取 

分 类 号：TB332[一般工业技术—材料科学与工程] O647.3[理学—物理化学]