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Metal complexation studies of amylopectin‐ graft ‐poly[( N , N ‐dimethylacrylamide)‐ co ‐(acrylic acid)]: a biodegradable synthetic graft copolymer
Author(s) -
Kolya Haradhan,
Tripathy Tridib
Publication year - 2015
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4922
Subject(s) - potassium persulfate , copolymer , graft polymer , acrylic acid , polymer chemistry , fourier transform infrared spectroscopy , aqueous solution , materials science , polymerization , adsorption , amylopectin , langmuir adsorption model , polymer , chemistry , chemical engineering , organic chemistry , starch , amylose , engineering , composite material
Synthesis of amylopectin‐ graft ‐poly[( N , N ‐dimethylacrylamide)‐ co ‐(acrylic acid)] was carried out using solution polymerization technique with potassium persulfate as the initiator. The graft copolymer was characterized by measuring molecular weight using size exclusion chromatography, thermal analysis and Fourier transform infrared ( FTIR ) spectroscopy. The synthetic graft copolymer was used for the removal of some potentially toxic metal ions, Cu( II ), Zn( II ) and Ni( II ), from their aqueous solutions. Various operating parameters like the amount of adsorbent, solution pH , contact time and temperature were studied. The adsorption data were well described by the pseudo‐second‐order and Langmuir isotherm models. Metal complexation studies were carried out experimentally using cyclic voltammetry and UV ‐visible and FTIR spectroscopies. The metal complex structure was also studied theoretically using density functional theory with the Gaussian 09 program and the geometry of the complex structure was optimized. The metal complexation ability of the graft polymer was in the order Cu( II ) > Ni( II ) > Zn( II ). Calculation of the various thermodynamic parameters was also done. The negative value of free energy change indicates the spontaneous nature of the adsorption. © 2015 Society of Chemical Industry