Synthesis of Polyvinyltetrazole from polyacrylonitrile for Adsorption of lead ions in aqueous solution

Polyvinyltetrazole (PVT) is produced from acrylonitrile (AN) monomer by using free Radical polymerization and Click Chemistry methods. The resulting polymer with a broad range of tetrazole-group contents was conveniently synthesized through [3+2] azide-nitrile cycloaddition reaction of nitrile containing polymer with sodium azide in DMF. The prepared PVT was characterized by13C-NMR, FT-IR and UV-Vis spectroscopies. Elemental analysis indicated that approximately 92% of the cyano groups on the polymer surface were converted totetrazolyl groups. The PVT exhibited excellent adsorption for metal ions and the maximum adsorption capacity for Pb (II) was 2.39mmol/g which are much higher than corresponding literature results. The adsorption process was described as an ion exchange and chelationinteraction 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), thermo gravimetry analysis (TGA), UV-Vis spectroscopy, and atomic absorption techniques (AAS). All these analyses methods confirmed the presence of metal in the polymer-metal complex.

کلیدواژه ها:

Free Radical polymerization ، Click Chemistry ، Acrylonitrile ، Heavy Metal Ions ، Adsorption.