Novel Tetrazole-Functionalized Absorbent based on poly (2,2,3,3 -tetracyanocyclo-propyl) phenylacrylate to remove heavy metal ions from aqueous solution

By : Mehdi Hosseinzadeh , Peyman Najafi Moghadam , Nader Noroozi Pesyan

Page No: 363-373

Abstract
The new method for synthesis of P-(2,2,3,3-tetracyanocyclopropyl) phenylacrylate (TCP) was applied. In this method p-acryloyloxybenzaldehyde was reacted with malononitrile and cyanogen bromide at 0° C in short time. Then the TCP monomer was polymerized by free-radical polymerization initiated with benzoyl peroxide in ethylacetate as solvent to obtain a polymer with multicyanocyclopropane functionalities in the pendant group. The prepared polymer was characterized by FT-IR, and 1H-NMR spectroscopy. A novel Tetrazole-Functionalized polymer as absorbent (TFP), was made from poly (2,2,3,3- tetracyanocyclo-propyl)phenylacrylate (PTCP) through [3+2] azide-nitrile cycloaddition reaction of nitrile containing polymer with sodium azide in DMF. It was found that approximately 50% of the cyano groups on the polymer surface were converted to tetrazolyl groups, as estimated by elemental analysis. The obtained functionalized absorbent showed strong adsorption ability to the investigated heavy metal ions, Cr (III), Cu (II), and Zn (II), with the maximum adsorption capacities of 5.67,4.13, and 2.51mmol g-1, respectively. The adsorption process was described as an ion exchange and chelation interaction mechanisms. The high adsorption rate (<40 min) was seen. The resulting polymer and its metal chelates were characterized by FT-IR, elemental analysis, gravimetry, UV-Vis spectroscopy and atomic absorption techniques (AAS).

Authors :
Mehdi Hosseinzadeh, Peyman Najafi Moghadam and Nader Noroozi Pesyan : Marand Faculty of Technical and Engineering, University of Tabriz, Tabriz, Iran