Amrāvati, India
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Anwane S.W.,Shri Shivaji Science College
Advanced Materials Letters | Year: 2012

Optimum alio-valent doping with yttrium sulphate creating 7% vacancy concentration provided promising features from sensor application view. This provides a better option over green Silver Sulphate. The sensors fabricated with the modified sulphate based silver ion conducting solid electrolyte, silver-silver sulphate reference electrode and test gas (Pt) electrodes has been tested over the range of 50-1000 ppm SO2 blended in constant oxygen-partial pressure and argon at 400°C. A promising sensor characteristic behaviour is exhibited by the modified electrolyte - solid solution of silver sulphate with yttrium. © 2012 VBRI Press.


Anwane S.W.,Shri Shivaji Science College
Advanced Materials Letters | Year: 2013

Composite materials which are heterogeneous mixtures of two or more solid phases offer value added properties for device applications. When ion conducting Ag2SO4 is dispersed with insulating BaTiO3, enhanced electrical properties are observed along with improved surface morphology. The electrical properties have been derived from the Complex Impedance Spectroscopic studies. Arrhenius Plot, Concentration and Temperature dependent conductivity and activation energy have also been studied. The ionic transference number of the composite system remains unchanged on dispersion thereby retaining its category as Solid Ionic Conductor (SIC). Moreover, 30 Wt% BaTiO3 dispersed in Ag2SO4 offers promisingly enhanced ionic conductivity and reduced activation energy of ion migration. This material has further scope for its utilization as a silver ion conductor in electrochemical applications like solid state batteries, gas sensors etc. The results obtained fit well in the established theories of composites. © 2013 VBRI press.


Anwane S.W.,Shri Shivaji Science College
Advanced Materials Letters | Year: 2012

Detailed impedance spectroscopic studies are carried out by incorporating various guest iso-valent cations within the solid solubility limit having different ionic radii in Ag2SO4. The solid solubility limits up to x = 3 mole% cation doped Ag2SO4 are set with XRD, SEM, IR and DSC techniques. A major dependence of conductivity on the ionic size of the doped iso-valent cations is observed. The ionic conductivity is found to increase with the incorporation of a guest cation that creates appropriate distortion factor in iso-valent cation doped Ag2SO4. The conductivity of Ag2SO4 is found to be dependent on the ionic size of the guest cation, particularly in the low-temperature modification of Ag2SO4 (β-phase). These results could throw light on the fundamental conduction mechanism in Ag2SO4 and also on the criterion of selecting the impurity cation in the classical doping method. The optimized solid electrolytes can then be utilized for their technological applications in electrochemical devices such as SOx sensors and thermal batteries. © 2012 VBRI Press.


Thakare Y.S.,Shri Shivaji Science College | Malkhede D.D.,University of Pune
Separation Science and Technology (Philadelphia) | Year: 2014

Gallium(III) was extracted at pH 3.5 by equilibrating eight min with 10 mL of 0.0001 M acetyl derivative of calix(6)arene in xylene. Gallium(III) was stripped quantitatively with 0.1 N hydrochloric acid and determined spectrophotometrically with 0.01% PAR at 510 nm. The nature of the extracted species was determined from the log-log plots and its stoichiometry was confirmed by numerical treatment to experimental data. The IR analysis of Ga(III) loaded organic phase was also studied. The conformational change of reagent during complex formation was studied from the 1H NMR treatment. The temperature dependence of the extraction equilibrium and metal loading capacity of the reagent was also evaluated. The proposed method was successfully applied for the extraction and separation of multicomponent mixtures, synthetic mixtures, and binary and ternary separation of gallium from the associated elements. The results obtained were reproducible and accurate. © 2014 Copyright Taylor & Francis Group, LLC.


Hete Y.V.,Rashtrasant Tukadoji Maharaj Nagpur University | Gholase S.B.,Rashtrasant Tukadoji Maharaj Nagpur University | Khope R.U.,Shri Shivaji Science College
E-Journal of Chemistry | Year: 2012

This study is carried out for the removal of cobalt from aqueous solution using granular activated carbon in combination with p-nitro benzoic acid at temperature 25±1 °C. The adsorption isotherm of cobalt on granular activated carbon has been determined and the data fitted reasonably well to the Langmuir and Freundlich isotherm for activated carbon.


Tiwari P.,Shri Shivaji Science College
Asian Journal of Microbiology, Biotechnology and Environmental Sciences | Year: 2013

Medicinal plants are the local heritage with global importance and world is endowed with a rich wealth of medicinal plants. Plants have a great potential to be effective against the growth of pathogenic bacteria. In the present investigation, a comparative study is performed using different parts (seeds, tender stem and leaf) of Psoralea corylifolia obtained in different solvent extracts (methanol, petroleum ether and aqueous) against pathogenic bacteria (Proteus vulgaris, Salmonella typhi, Kleibsella pneumonia and Pseudomonas aeruginosa). The antibacterial activity of these extracts was done against bacteria by agar disc diffusion method. Among the three-extracts of various plant parts, methanol extract of leaf showed maximum inhibition against Salmonella typhi followed by Pseudomonas aeruginosa. The findings also suggest that methanol extracts of tender stem of Psoralea corylifolia also show great effectivity against bacterial infections. © Global Science Publications.


Kemdeo S.M.,Shri Shivaji Science College | Sapkal V.S.,Sant Gadge Baba Amravati University | Chaudhari G.N.,Shri Shivaji Science College
Journal of Molecular Catalysis A: Chemical | Year: 2010

12 wt% MoO3/TiO2-SiO2 solid acid catalyst was prepared and calcined at various temperatures. The calcined catalyst was characterized by XRD, FT-IR, BET, SEM, NH3-TPD and pyridine adsorbed FT-IR methods. The effect of calcination temperature on activity of catalyst was studied by choosing liquid phase nitration of phenol as a model reaction. For the same reaction effect of various solvents, effect of reaction time and reusability of the catalyst was also studied. Catalyst calcined at 500 °C temperature showed highest phenol conversion whereas greater o-nitrophenol selectivity is claimed over catalyst calcined at 700 °C. It was observed that high phenol conversion co-relates with the presence of greater number of strong Brönsted acid sites over the catalyst surface whereas the selectivity of o-nitrophenol is related to the pore size of the catalysts. No use of sulfuric acid along with the nitric acid used in its diluted form in the reaction makes the process safe and environmentally friendly. © 2010 Elsevier B.V. All rights reserved.


Patil Sahadeo D.,Shri Shivaji Science College | Kamble Vilas A.,Adarsha Science
International Journal of Pharma and Bio Sciences | Year: 2011

Essential oils are well known in traditional medicine as antiseptic and antimicrobial agents. This study determined the antimicrobial effects of eleven spice essential oils using a disc diffusion method against four Gram-positive and eight Gramnegative bacteria of spoilage and health significance. Cassia oil showed the largest zones of inhibition (12 to 54 mm) and the widest antibacterial spectrum, followed by essential oil of allspice, clove and nutmeg. Essential oils of mace, celery, ginger, cardamom, black pepper, fennel and turmeric were the least effective spice oils. Grampositive bacteria were shown to be more sensitive to the spice essential oils than Gramnegative bacteria. Staphylococcus aureus and Bacillus subtilis were the most sensitive bacterial strains tested; where as a strain of Escherichia coli (MTCC-118) was the least sensitive. These results showed that spice essential oils may prove useful in inhibiting bacteria of food spoilage and health significance.


Nagpure P.A.,Shri Shivaji Science College | Omanwar S.K.,Sant Gadge Baba Amravati University
Journal of Luminescence | Year: 2012

The photoluminescence properties in UV and N-UV excitable range for the phosphors of Na 2La 2B 2O 7: RE (RE=Eu, Tb, Ce, Sm, Gd) are investigated. The solution combustion synthesis technique was employed for the synthesis of the phosphors Na 2La 2B 2O 7: RE. The photoluminescence measurements of the phosphors were carried out on a HITACHI F7000 Fluorescence Spectrophotometer. The PL and PL excitation (PLE) spectra indicate that the main emission wavelength of Na 2La 2B 2O 7: Eu are 591 and 615 nm, Na 2La 2B 2O 7: Ce shows dominating emission peak at 387 nm and Na 2La 2B 2O 7: Tb displays green emission at 493, 544, 593 and 620 nm at 254 nm excitation, while Na 2La 2B 2O 7: Sm shows the main emission peak wavelengths 566 and 604 nm at 405 nm excitation and Na 2La 2B 2O 7: Gd shows dominating emission peak at 312 nm at 274 nm excitation. These phosphors may provide a new kind of luminescent materials under ultraviolet and near ultraviolet excitation for various applications. © 2012 Elsevier B.V. All rights reserved.


Rohokale P.G.,Shri Shivaji Science College
International Journal of Pharma and Bio Sciences | Year: 2015

The analysis of ground water samples from Rahuri City was carried out for their trace metal contamination. Bore well water from specific areas was collected and analysed to test the contamination by heavy metals like Cd, Cr, Pb, Cu, Ni and Zn. The results were compared with the standard values reported by WHO and ISI. The present study reveals that the water quality in some areas is so bad that it is not suitable for the drinking purpose, as the level of contamination is quite above the standard one.

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