Preparation of Cadmium Ion Imprinted Polymer by Microwave-assisted Inverse Emulsion Polymerization and Its Extracting Property for Cd(Ⅱ)
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KeyWord:microwave-assisted  inverse emulsion polymerization  Cd(Ⅱ) ion imprinted polymers  solid phase extraction
ZHU Fang,LI Lu-wei,HE Si-ying 1.太原理工大学环境科学与工程学院;2.中持水务股份有限公司
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      Cadmium ion imprinted polymers(Cd(Ⅱ)-IIP) were prepared by microwave-assisted inverse emulsion polymerization method with β-cyclodextrin and acrylamide as functional monomers,epichlorohydrin as crosslinking agent and ammonium persulfate as initiator.The Cd(Ⅱ)-IIP was characterized by scanning electron microscopy(SEM).Results showed that the Cd(Ⅱ)-IIP became uneven after elution,and had a complex pore structure on the surface.These specific recognition sites benifited the Cd(Ⅱ)-IIP to recognize and adsorb Cd(Ⅱ).The result of adsorption isotherm showed that the adsorption process of the Cd(Ⅱ)-IIP followed the Langmuir adsorption model(r2>0.99).The adsorption process obeyed Scatchard model,and the dissociation constant KD and the maximum apparent adsorption binding capacity Qmax were 72.99 mg/L and 130 mg/g,respectively.The optimum extraction condition was listed as follows:eluent:methanol-acetic acid(7∶1),the Cd(Ⅱ) concentration:10 μg/L and pH 7.0.The extraction efficiency of Cd(Ⅱ)-IIP was more than 70%when it was used five times.In the presence of the competition ions,the extraction efficiency of Cd(Ⅱ),Cu(Ⅱ),Zn(Ⅱ) and Pb(Ⅱ) was 97.58%,15.07%,5.28%and 40.2%,respectively.The relative standard deviation(RSD) and the detection limit(3σ) of the method were about 2.7%and 0.809 4 μg/L,respectively.The recoveries for Cd(Ⅱ) in waste water samples were between 93.6%and 101%.