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