Nāgpur, India
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Copolymer resins (8-HQSABF) were synthesized by the ondensation of 8-hydroxyquinoline-5-sulphonic acid and biuret with formaldehyde in the presence of hydrochloric acid as catalyst, proved to be selective chelation ion exchange copolymer resins for certain metals. Chelation ion exchange properties to these polymers were studied for Cu2+, Cd2+, Co2+and Zn2+ ions. A batch equilibrium method was employed in the study of the selectivity of the distribution of a given metal ions between the polymer sample and a solution containing the metal ion. The study was carried out over a wide pH range and in a media of various ions strengths. The polymer showed a higher selectivity for Cu2+ ions than for Cd2+, Co 2+ and Zn2+ ions. Hence on the basis of above studies these copolymer may be used as semiconductors, surface coating, ion-exchangers, materials for rechargeable battery cell in various electronic industries , plastic materials, elastomers and in boiler plants.


Puppalwar S.P.,Kamla Nehru College | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University | Dhoble N.S.,Sevadal Mahila Mahavidhyalaya | Kumar A.,Indian National Environmental Engineering Research Institute
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2012

Li 2NaBF 6 doped with Cu and co-doped with P are synthesized by wet chemical technique and exposed to gamma-rays of 60Co for their thermoluminescence (TL) properties. The XRD technique shows the crystalline nature of the prepared material. The induced TL glow curves of Cu doped sample are found to be at 118 °C with a single peak. Li 2NaBF 6: Cu is low Z material (Z eff = 8.96) and observed 4.3 times more sensitive than LiF: Mg, Ti (TLD-100). A linear TL response is observed in Li 2NaBF 6: Cu in a long span of exposures. The trap parameters namely order of kinetics (b), activation energy (E), frequency factor (s) and Balarin parameter (γ) associated with the most intensive glow peak, i.e. the 118 °C glow peak of Li 2NaBF 6: Cu phosphor were determined by using glow curve shape (Chen's) method and these parameters are in good agreement. Photoluminescence (PL) emission spectra of Li 2NaBF 6: Cu phosphor shows the strong prominent peak at 368 nm in the violet region of the visible spectrum due to the transition of 3d 94s 1↔ 3d 10 of Cu + ion. The increase in photoluminescence of Li 2NaBF 6: Cu by co-doping with P has been studied. © 2011 Elsevier B.V. All rights reserved.


Singru R.N.,Laxminarayan Institute of Technology | Gurnule W.B.,Kamla Nehru College
Iranian Polymer Journal (English Edition) | Year: 2010

Copolymer resins (p-COF) synthesized by the condensation of p-cresol and oxamide with formaldehyde in the presence of acid catalyst, were proved to be selective chelation ion-exchange copolymers for certain metals. The chelating ion-exchange properties of these copolymers were studied for Fe(III), Cu(II), Ni(II), Co(II), Zn(II), Cd(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 copolymer showed a higher selectivity for Fe(III), Cu(II) and Ni(II) ions than for Co(II), Zn(II), Cd(II) and Pb(II) ions. Distribution ratios (D) of metal ions were found to be increased by increasing pH of the solutions; hence the resin can be used to recover certain metal ions from waste solutions and used for the purpose of purification of waste water and removal of iron from boiler water. The ion-exchange capacity of metal ions has also been determined experimentally and compared with other commercial resins. Besides ion-exchange properties, the copolymer resins were also characterized by viscometric measurements in dimethyl sulphoxide (DMSO), UV-visible absorption spectra in non-aqueous medium, infra-red spectra and nuclear magnetic resonance spectra. The physico-chemical and spectral methods were used to elucidate the structures of p-COF resins. The morphology of the copolymers 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.


Gurnule W.B.,Kamla Nehru College | Patle D.B.,Rashtrasant Tukadoji Maharaj Nagpur University
Polymer Bulletin | Year: 2011

A novel chelating copolymer resin has been synthesized through the copolymerization of o-aminophenol and melamine with formaldehyde (o-APMF) in 1:1:3 mol ratio using hydrochloric acid as a reaction medium by condensation technique. The synthesized copolymer resin was characterized by elemental analysis, FTIR, and 1H NMR spectroscopy. On the basis of the spectral studies, the structure of the copolymer resin was proposed. The physico-chemical parameters have been evaluated for the copolymer resin. Non-aqueous conductometric titration was used to determine the average molecular weight and polydispersity of the o-APMF copolymer resin and the intrinsic viscosity was also determined. The semicrystalline nature of the synthesized copolymer was established by scanning electron microscopy (SEM). Batch equilibrium method was employed to study the selectivity and binding capacity of the copolymer resin toward certain trivalent and divalent metal ions such as Fe3+, Zn2+, Cu2+, Pb2+, Cd 2+, and Hg2+ and in different electrolyte concentrations, wide pH ranges, and time intervals. © 2010 Springer-Verlag.


Singru R.N.,Rashtrasant Tukadoji Maharaj Nagpur University | Gurnule W.B.,Kamla Nehru College
Journal of Thermal Analysis and Calorimetry | Year: 2010

The title terpolymer (8-HQ5-SAMF-II) is synthesized by the condensation of 8-hydroxyquinoline 5-sulfonic acid (8-HQ5-SA) and melamine (M) with formaldehyde (F) in the presence of acid catalyst and using 2:1:3 M proportions of the reacting monomers. The synthesized terpolymer resin is then characterized by different physicochemical techniques viz. number average molecular mass determination, intrinsic viscosity determination, and spectral studies like UV-Visible, IR,1H NMR, and13C NMR spectra. The morphology of synthesized terpolymer was studied by scanning electron microscopy (SEM). The thermogravimetry of the terpolymer resin prepared in this study has been carried out by nonisothermal thermogravimetry 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 their mode of decomposition and relative thermal stabilities. Thermal decomposition curves were studied carefully with minute details. 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 terpolymer resins. Thermal activation energy Ea calculated with the two above-mentioned methods are in close agreement. 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 thermogravimetry, various thermodynamic parameters like frequency factor Z, entropy change ΔS, free energy change ΔF, and apparent entropy S* have been determined using Freeman-Carroll method. © Akadémiai Kiadó, Budapest, Hungary 2010.


Puppalwar S.P.,Kamla Nehru College | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University | Kumar A.,Indian National Environmental Engineering Research Institute
Indian Journal of Pure and Applied Physics | Year: 2011

Rare earth Ce and Dy doped polycrystalline Li2BPO5 phosphors were prepared by high temperature solid state reaction. Photoluminescence emission spectra of the phosphor suggest the presence of Ce3+ ions in Li2BPO5:Ce and Dy3+ ions in Li2BPO5:Dy lattice sites. The prepared phosphors were characterized by the X-ray powder diffraction and photoluminescence techniques. The PL emission spectrum of Dy3+ ion under 348 nm excitation was observed at 481 nm (blue) due to 4F9/2→ 6H15/2 transitions and 576 nm (yellow) emission due to 4F9/2 → 6H13/2 transitions in prepared borophosphate phosphor. The PL emission spectra of Ce3+ ion was observed at 346 nm in ultraviolet region by 235 nm excitation. In this paper, PL and lyoluminescence (LL) characteristics of Li2BPO5:Ce, Dy borophosphate phosphors have been reported. The LL results show the LL emission of Li2BPO5:Ce3+, Dy3+ phosphor in blue-yellow region of the spectrum and linear response curve of LL with gamma rays exposure up to 3.5 kGy. These LL characteristics of Li2BPO5: Ce3+, Dy3+ phosphor may be useful for high radiation dose using LL technique.


Puppalwar S.P.,Kamla Nehru College | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Journal of Luminescence | Year: 2013

LiNaSO4:Cu and LiNaSO4:Cu,Mg low Z phosphors (Z eff=11.59) are synthesized by wet chemical route and exposed to γ-rays of 60Co for their thermoluminescence (TL) study. The XRD technique showed the crystalline nature of the prepared material. Photoluminescence studies have been undertaken to ensure the successful incorporation of Cu and Mg impurities in LiNaSO4 host lattice. The induced TL glow curves of LiNaSO4:Cu and LiNaSO4:Cu,Mg samples are found at 166 °C and 160 °C with single peak respectively. The TL intensity was found to be enhanced nearly two times by co-doping of Mg in LiNaSO4:Cu. The prepared phosphors have a linear response, less fading and excellent reusability. The whole glow curve displays a good stability under storage at room temperature. Comparison of TL intensity of the most intensive glow peak of LiNaSO4:Cu,Mg with that of standard TLD CaSO4:Dy shows that their intensities are almost equal. The trap parameters namely order of kinetics (b), activation energy (E), frequency factor (s) and Balarin parameter (γ) associated with the most intensive glow peak, i.e. 160 °C glow peak of LiNaSO4:Cu phosphors were determined by using glow curve shape (Chen's) method. The deconvolution of the glow curve was done by using computerized glow curve deconvolution (CGCD) technique. © 2013 Elsevier B.V.


Singru R.N.,Rashtrasant Tukadoji Maharaj Nagpur University | Gurnule W.B.,Kamla Nehru College
Journal of Applied Polymer Science | Year: 2010

Copolymers (8-HQ5-SAOF) were synthesized by the condensation of 8-hydroxyquinoline 5-sulphonic acid (8-HQ5-SA) and oxamide (O) with formaldehyde (F) in the presence of acid catalyst. Four different copolymers were synthesized by using varied molar proportion of the reacting monomers. Copolymer resin composition has been determined on the basis of their elemental analysis and average molecular weights of these resins were determined by conductometric titration in nonaqueous medium. Viscometric measurement in dimethyl sulphoxide (DMSO) has been carried out with a view to ascertain the characteristic functions and constants. Electronic spectra, FTIR, and proton nuclear magnetic resonance spectra were studied to elucidate the structures. The newly synthesized copolymer proved to be a selective chelating ion-exchange copolymer for certain metals. The chelating ion-exchange properties of this synthesized copolymer was studied for different metal ions such as Fe3+, Cu 2+, Ni2+,Co2+, Zn2+, Cd 2+, and Pb2+. A batch equilibrium method was used 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 only for representative copolymer 8-HQ5-SAOF-I due to economy of space. The study was carried out over a wide pH range, shaking time, and in media of various ionic strengths. The copolymer showed a higher selectivity for Fe3+, Cu2+, and Ni2+ ions than for Co2+, Zn2+, Cd2+, and Pb2+ ions. © 2010 Wiley Periodicals, Inc.


Gurnule W.B.,Kamla Nehru College | Katkamwar S.S.,Rashtrasant Tukadoji Maharaj Nagpur University
Journal of Applied Polymer Science | Year: 2012

A copolymer resin (p-APDF) has been synthesized using the monomers p-aminophenol, dithiooxamide, formaldehyde in 1: 1: 2M proportions in the presence of 2M HCl as catalyst. The structure of p-APDF copolymer has been elucidated on the basis of elemental analysis and various physicochemical techniques, i.e., UV-visible, FTIR, and 1H-NMR spectroscopy. The number average molecular weight of copolymer resin was determined by nonaqueous conductometric titration in DMF. Viscosity measurement were carried out in DMF indicate normal behavior. The prepared resin proved to be a selective ion exchange resin for some metal ions. The chelating ion exchange properties of this resin was studied for Fe(III) and Cu(II), Ni(II), Co(II), Zn(II), Cd(II), Pb(II) ions. A batch equilibrium method was used to study selectivity of metal ion uptake over a wide pH range and in media of various ionic strength. The resin showed a higher selectivity for Fe(III), Ni(II), Cu(II) ions than for Co(II), Pb(II), Zn(II), and Cd(II) ions. © 2011 Wiley Periodicals, Inc.


Nagpure I.M.,Kamla Nehru College | Pawade V.B.,Kamla Nehru College | Dhoble S.J.,Kamla Nehru College
Luminescence | Year: 2010

The synthesis, X-ray diffraction, photoluminescence, TGA/DTA and FTIR techniques in Dy3+ activated Na2Sr(PO4)F phosphor are reported in this paper. The prepared phosphor gave blue, yellow and red emission in the visible region of the spectrum at 348 nm excitation. CIE color co-ordinates of Na2Sr(PO4)F:Dy3+ are suitable as white light-emitting phosphors. © 2009 John Wiley & Sons, Ltd.

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