Synthesis of Polyvinyltetrazole by Combination of Free Radical Polymerization and Click Chemistry for Adsorption of Pb (II) in Aqueous Solution

Subject Areas : Polymer

Mehdi Hosseinzadeh ¹ (Marand Faculty of Technical and Engineering, University of Tabriz, Tabriz, Iran)
Farideh Mahmoodzadeh ² (Halal Research Center of IRI, FDA, Tehran, Iran)

Received: 2019-07-10 Accepted : 2019-07-10 Published : 2019-05-01

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Abstract :

Polyvinyltetrazole (PVT) is produced from acrylonitrile (AN) monomer by using free-radicalpolymerization and Click Chemistry methods. The resulting polymer with a broad range of tetrazolegroup contents was conveniently synthesized through [3+ 2] azide-nitrile cycloaddition reaction ofnitrile-containing polymer with sodium azide in DMF. The prepared PVT was characterized by13CNMR,FT-IR and UV-Vis spectroscopies. Elemental analysis indicated that approximately 92% ofthe cyano groups on the polymer surface were converted to tetrazolyl groups. The PVT exhibitedexcellent adsorption form et al ions and the maximum adsorption capacity for Pb (II) was2.39mmol/g which are much higher than corresponding literature results. The adsorption processwas described as an ion exchange and chelation interaction mechanisms. The high adsorption rate(<40 min) was seen. The resulting polymer and its metal chelate were characterized by FT-IR,elemental analysis, gravimetry, scanning electronic microscopy (SEM), thermogravimetry analysis(TGA), UV-Vis spectroscopy, and atomic absorption techniques (AAS). All these analyses methodsconfirmed the presence of metal in the polymer-metal complex.