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Nāgpur, India

Gurnule W.B.,Kamla Nehru Mahavidyalaya | Dhote S.S.,Rashtrasant Tukadoji Maharaj Nagpur University
Der Pharma Chemica | Year: 2012

Copolymer resin (2,4-DHBEDF) has been synthesized by the condensation polymerization of 2,4-dihyroxybenzoic acid and ethylene diamine with formaldehyde in the presence of acid catalyst, was proved to be selective chelation ion-exchange resin for certain heavy metals. The chelating ion-exchange properties of these copolymer was studied for Fe(III), Cu(II), Ni(II), Co(II), and Pb(II) ions in the form of their metal nitrate solutions. A batch equilibrium method was employed in the study of the selectivity of metal ion uptake involving the measurements of the distribution of a given metal ion between the copolymer sample and a solution containing the metal ion. The study was carried out over a wide pH range, shaking time and in media of various ionic strengths of different electrolytes. The ion-exchange capacity of metal ions has also been determined experimentally and compared with other commercial resins. Besides ion-exchange properties, the copolymer resin was also characterized by viscometric measurements in dimethyl sulphoxide (DMSO), UV-visible absorption spectra in non-aqueous medium, infra-red spectra, nuclear magnetic resonance spectra and C 13 NMR spectra. The physico-chemical and spectral methods were used to elucidate the structures of 2,4-DHBEDF resin. The morphology of the copolymer was studied by scanning electron microscopy; showing amorphous nature of the resins therefore can be used as a selective ion- exchanger for certain metal ions. Source


Gurnule W.B.,Kamla Nehru Mahavidyalaya | Katkamwar S.S.,Commerce and Science College
Rasayan Journal of Chemistry | Year: 2012

The concentration of different toxic metals has increased beyond environmentally and ecologically permissible lends due to increase in industrial activity. More than 100 million people of West Bengal in India and Bangladesh are affected by drinking ground water contaminated with copper, lead, cadmium and some part of India is also affected by poisoning effects of Copper, Cadmium, Zinc, Lead. Different methods have been evolved to reduce the cadmium concentration in water in a maximum permissible level of 10 μg/L as where various methods are also available today, removal of cadmium and copper by polymeric ion-exchangers has been most effective. While chelating ion-exchange resins having specific chelating groups attached to a polymer have found extensive use in sorption of Cu2+ and Cd2+ ions.The copolymer resin o-APDF has been synthesized by the condensation of o-amino phenol and dithiooxamide with formaldehyde in 1:1:2 molar ratio in presence of 2 M hydrochloric acid as catalyst. The newly synthesized copolymer resin has been characterised by UV-visible, IR and proton NMR spectral studies. The copolymer o-APDF proved to be a selective chelating ion exchange polymer for certain metals. Chelating ionexchange properties of this polymer were studied for Fe3+, Cu2+, Ni2+, Co2+, Zn 2+, Cd2+ and Pb2+ ions. A batch equilibrium method has been employed in the study of the selectivity of metal-ion uptake involving the measurements of the distribution of a given metal ion between the copolymer sample and a solution containing the metal ion. The study was carried out over a wide pH range and in media of various ionic strengths. The polymer showed higher selectivity for Fe3+, Cu2+, Ni2+ than for Co2+, Zn2+, Cd2+- and Pb+2 ions. Study of distribution ratio as a function of pH indicates that the amount of metal ion taken by resin increases with the increasing pH of the medium. © 2012 RASÄYAN. All rights reserved. Source


Gurnule W.B.,Kamla Nehru Mahavidyalaya
Rasayan Journal of Chemistry | Year: 2012

The Copolymer (p-HBSF) was synthesized by condensation of p-hydroxybenzoic acid and semicarbazide with formaldehyde in the presence of 2M HCL as a catalyst at 126 ± 2° C for 5 hrs. with molar proportion of reactants. The synthesized copolymer resin has been characterized by different physico-chemical techniques. Thermogravimetric analysis of all copolymer resins in present study have been carried out by non-isothermal thermogravimetric analysis technique in which sample is subjected to condition of continuous increase in temperature at linear rate. Thermal study of the resins was carried out to determine their mode of decomposition and relative thermal stabilities. The copolymer (p-HBSF) was characterized by FT-IR, 1H-NMR Spectroscopy. The thermal decomposition behavior of copolymer was studied by using TGA in static nitrogen atmosphere at a heating rate of 10°C/min. The advantage of Freeman-Carroll method is to calculate both the order of reaction (n) and energy of activation in one single stage by keeping heating rate constant. Thermal activation energy (Ea) calculated with above two mentioned methods are in close agreement. Freeman Carroll and Sharp-Wentworth methods were used to calculate the thermal activation energy (Ea), the order of reaction (n), entropy Change (AS), free energy change (AF), apperent entropy change (AS), and frequency factor (Z). The thermal activation energy determined with the help of these method was in good agreement with each other. © 2012 RASÄYAN. All rights reserved. Source


Rahangdale S.S.,Commerce and Indiraben Hariharbhai Patel Science College | Gurnule W.B.,Kamla Nehru Mahavidyalaya
Der Pharma Chemica | Year: 2011

The copolymer (2, 2'-HBDF) synthesized by the condensation of 2, 2'-dihydroxybiphenyl (2, 2'-HB) and dithiooxamide (D) with formaldehyde (F) in the presence of acid catalyst and using 1:1:2 molar proportions of the reacting monomers. The copolymer possesses antimicrobial activity for certain bacteria such as Staphylococcus aureus, Escherichia coli, and fungi Aspergillus niger, Candida albicans. The thermogravimetric analysis of copolymer resin prepared in present study has been carried out by non-isothermal thermogravimetric analysis technique in which sample is subjected to condition of continuous increase in temperature at linear rate. Thermal study of the resin was carried out to determine its mode of decomposition and relative thermal stabilities. The Freeman-Carroll and Sharp-Wentworth methods have been used in the present investigation to calculate thermal activation energy and different kinetic parameter of the copolymer resins. The advantage of Freeman-Carroll method is to calculate both the order of reaction (n) and energy of activation in one single stage by keeping heating rate constant. By using data of thermogravimetric analysis, various thermogravimetric parameters like frequency factor (Z), entropy change (ΔS), free energy change (ΔF) and apparent entropy (S*) have been determined using Freeman-Carroll method. Source


Rahangdale S.S.,Commerce and Indiraben Hariharbhai Patel Science College | Gurnule W.B.,Kamla Nehru Mahavidyalaya
Der Pharma Chemica | Year: 2012

Terpolymer resins (SOMF) were synthesized using salicylaldoxime, and melamine with formaldehyde in presence of hydrochloric acid as catalyst and using different molar proportions of salicylaldoxime, melamine and formaldehyde respectively. Its composition has been determined on the basis of the elemental analysis. The number average molecular weights have been determined by non-aqueous conductometric titration. Themogravimetric data was analysed to determine thermal stability of terpolymer and kinetic parameters were evaluated on the basis of thermogram of terpolymer. Freeman-Carroll and Sharp-Wentworth method have been used to calculate activation energy and thermal stabilities of these polymers. Kinetic parameters have been calculated using data of Freeman-Carroll method. the results obtained have been suitably discussed. Source

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