Amylopectin-g-poly(methylacrylate-co-sodium acrylate): An efficient Cd(II) binder.
Synthesis, characterization and Cd(II) adsorption studies of a novel biodegradable graft copolymer based on partially hydrolysed polymethylacrylate (PMA) grafted amylopectin was reported, which was prepared by first grafting of PMA chains onto the amylopectin backbone followed by partial alkaline hydrolysis. The hydrolysed graft copolymer (PHAP) was characterized by measuring saponification equivalent (SE), FTIR, (1)H NMR and (13)C NMR spectroscopy and thermal analysis (TG/DTG). The graft copolymer was biodegradable. Various operating variables affecting the metal sorption such as, amount of adsorbent, solution pH, contact time, temperature and Cd(II) solution concentration were studied which showed that the maximum adsorption of Cd(II) was found at pH 5.5, temperature 90°C, time 120min, polymer dose, 0.02g/L and initial Cd(II) concentration, 50mg/L. The adsorption data were well described by the pseudo-second-order and Langmuir isotherm model. Metal complexation studies were carried out experimentally using UV-visible, FTIR spectroscopy and theoretically using Density Functional Theory by Gaussian 09 and Gauss view 5.0 programmes which confirms a square planer geometry involving Cd(II) and COO(-) groups. Calculation of the various thermodynamic parameters was also done. The negative value of free energy change indicates the spontaneous nature of the adsorption.
Postgraduate Division of Chemistry, Midnapore College (Autonomous), Midnapore, Paschim Medinipur, 721101 West Bengal, India.
Dinabandhu
D
Sasmal
Postgraduate Division of Chemistry, Midnapore College (Autonomous), Midnapore, Paschim Medinipur, 721101 West Bengal, India.
Haradhan
H
Kolya
Postgraduate Division of Chemistry, Midnapore College (Autonomous), Midnapore, Paschim Medinipur, 721101 West Bengal, India. Electronic address: tridib_tripathy@yahoo.co.in.
Tridib
T
Tripathy
D000327:Adsorption; D000687:Amylopectin / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry* / Q000648:ultrastructure; D001673:Biodegradation, Environmental; D002104:Cadmium / Q000302:isolation & purification*; D066241:Carbon-13 Magnetic Resonance Spectroscopy; D004055:Differential Thermal Analysis; D005670:Fusarium / Q000254:growth & development / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D007477:Ions; D007700:Kinetics; D008968:Molecular Conformation; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000138:chemical synthesis / Q000737:chemistry*; D066244:Proton Magnetic Resonance Spectroscopy; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013818:Thermogravimetry; D013997:Time Factors
D007477:Ions; D011108:Polymers; D011109:Polymethacrylic Acids; C000614920:amylopectin-g-poly(methylacrylate-co-sodium acrylate); D002104:Cadmium; D000687:Amylopectin
Amylopectin; Biodegradation; Cd(II) ion removal; Density Functional Theory; Graft copolymer; Methylacrylate