Synthesis and Application of Novel Magnetic Lead (II) Ion Imprinted Polymers Based on Multiwalled Carbon Nanotubes
Novel magnetic ion imprinted polymers based on vinyl-functionlized multiwalled carbon nanotubes(MWNTs@MIIPs) with highly selective adsorption toward Pb2+ were synthesized using Pb2+ as the template,methacrylic acid as the functional monomer and ethylene glycol dimethacrylate as the cross-linker.The MWNTs@MIIPs were characterized by scanning electron microscopy,Fourier-transform infrared analysis and vibrating sample magnetometer analysis.Adsorption studies demonstrated that the MWNTs@MIIPs possessed excellent adsorption and selective recognition ability towards Pb2+ with a maximum capacity of 25.9 mg/g.And the selectivity factor of MWNTs@MIIPs towards Pb2+/Cu2+,Pb2+/Zn2+ Pb2+/Co2+,Pb2+/Mg2+,Pb2+/Cd2+and Pb2+/Ni2+ was 2.3,2.5,2.1,2.2,2.1 and 2.4,respectively.Combined with atomic absorption spectrometric analysis technology,the MWNTs@MIIPs were successfully applied for separation and enrichment trace Pb2+ in environmental real samples with the enrichment factor of 40.5.