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Bela, India

Shahi S.K.,PEC University of Technology | Shahi S.K.,ASBASJSM College | Kaur N.,PEC University of Technology | Singh V.,PEC University of Technology
Applied Surface Science | Year: 2016

In this paper, pure rutile and anatase-rutile TiO2 nanoparticles have been successfully synthesised via a green route by hydrolysis of titanium tetrachloride with room temperature acidic ionic liquid 3-methyl-1-(3-sulfonylpropyl) imidazolium trifluoromethanesulfonate [HO3S(CH2)3MIM][CF3SO3] in aqueous medium. The influence of pH of the solution by varying molar ratio of substrate and ionic liquid has been investigated in both sol-gel and hydrothermal synthesis of TiO2 with significant variation in phase, phase composition (ratio of rutile to anatase) and morphology as indicated by various structural analysis such as XRD, TEM, BET, Raman and UV-vis absorption spectroscopy. The results indicate formation of a bunch of aligned thin flaky nano-rods of TiO2 which look like nano-flowers with a crystal size of 3-5 nm by sol-gel method, while in case of hydrothermal method well-defined rutile solid nanorods of TiO2 were formed with variable length in the range of 120-170 nm and 20-24 nm in width. The photocatalytic activity of the prepared TiO2 samples has been determined by the photodegradation of methyl orange dye (20 ppm) under UV light. Best photocatalytic activity was exhibited by sample S-2 prepared via sol-gel method. © 2015 Published by Elsevier B.V. Source


Kaur N.,PEC University of Technology | Kaur S.,PEC University of Technology | Kaur S.,ASBASJSM College | Singh V.,PEC University of Technology
Desalination and Water Treatment | Year: 2015

In this paper, we report the detailed kinetic and mechanistic study using N, Fe codoped TiO2 for the degradation of Reactive Red dye 198 (RR dye 198) under visible light. The N, Fe codoped TiO2 was prepared by sol–gel method using urea and ferric nitrate as the dopant source and well characterized by XRD, FTIR, DRS, TEM, XPS, EDX, and BET techniques. The N, Fe codoped TiO2 nanoparticles were found to be 95.55% anatase and 4.45% rutile phase, with a narrow particle size distribution of 4–7 nm, having band bap of 2.4 eV, surface area of 98.01 m2 g−1, and are cubic in shape. The process conditions for photocatalytic degradation of RR dye 198 using N, Fe codoped TiO2 under visible light have been optimized by varying operational parameters such as catalyst loading, pH, initial concentration of the substrate, and the effect of electron acceptors have been examined. The addition of H2O2 as a co-oxidant showed an anomalous behavior in the degradation pattern. The degradation followed first-order kinetics with r0 of 3.036 mg L−1 min−1 at natural pH and obeyed the Langmuir–Hinshelwood model. The mechanism of degradation has been investigated with the help of radical quenchers. The GC–MS analysis of the residue after degradation depicted the degradation pattern of the dye under optimized conditions. © 2015 Balaban Desalination Publications. All rights reserved. Source


Shahi S.K.,PEC University of Technology | Shahi S.K.,ASBASJSM College | Kaur N.,PEC University of Technology | Kaur A.,PEC University of Technology | Singh V.,PEC University of Technology
Journal of Materials Science | Year: 2015

This is the first report of a facile and green method for the synthesis of nanocrystalline anatase TiO2 in an acidic room temperature ionic liquid 1-buty-3-methylimidazolium hydrogen sulphate [Bmim] HSO4 as an acidic hydrolysing and templating/structure directing agent avoiding the use of corrosive mineral acids and surfactants, respectively. The effect of calcination temperature was studied at 100, 350, 550 and 750 °C to obtain samples S-1 to S-4, respectively, and the effect on morphology, phase, surface area and band gap of TiO2 was investigated using XRD, TEM, (UV–Vis) diffuse reflectance spectroscopy, BET surface area and Raman spectroscopic techniques. It was observed that with an increase in temperature of calcination, the phase of TiO2 nanoparticles remained anatase, while the morphology of the particles was both spherical and cubic in nature with particle size varying between 4 and 30 nm. The ionic liquid used was both recoverable and recyclable up to three cycles. The photocatalytic activity of the samples was tested for the degradation of methyl orange as the model compound under ultraviolet light. The nanoparticles of TiO2 calcined at 550 °C showed high photocatalytic activity. © 2015, Springer Science+Business Media New York. Source


Kaur N.,PEC University of Technology | Kaur S.,PEC University of Technology | Kaur S.,ASBASJSM College | Singh V.,PEC University of Technology
Desalination and Water Treatment | Year: 2016

In this paper, we report the detailed kinetic and mechanistic study using N, Fe codoped TiO2 for the degradation of Reactive Red dye 198 (RR dye 198) under visible light. The N, Fe codoped TiO2 was prepared by sol–gel method using urea and ferric nitrate as the dopant source and well characterized by XRD, FTIR, DRS, TEM, XPS, EDX, and BET techniques. The N, Fe codoped TiO2 nanoparticles were found to be 95.55% anatase and 4.45% rutile phase, with a narrow particle size distribution of 4–7 nm, having band bap of 2.4 eV, surface area of 98.01 m2 g−1, and are cubic in shape. The process conditions for photocatalytic degradation of RR dye 198 using N, Fe codoped TiO2 under visible light have been optimized by varying operational parameters such as catalyst loading, pH, initial concentration of the substrate, and the effect of electron acceptors have been examined. The addition of H2O2 as a co-oxidant showed an anomalous behavior in the degradation pattern. The degradation followed first-order kinetics with r0 of 3.036 mg L−1 min−1 at natural pH and obeyed the Langmuir–Hinshelwood model. The mechanism of degradation has been investigated with the help of radical quenchers. The GC–MS analysis of the residue after degradation depicted the degradation pattern of the dye under optimized conditions. © 2015 Balaban Desalination Publications. All rights reserved. Source


Hitanga J.,ASBASJSM College | Kumar S.,ASBASJSM College | Jain S.M.,Oniosome Research Center | Jain S.,Oniosome Research Center
International Journal of Pharmacy and Technology | Year: 2015

The aim of this study was to develop and characterize Nebivolol hydrochloride (NBH)nanosuspension to enhance its dissolution rate and oral bioavailability. Nanosuspensions were prepared by the nanoprecipitation method. The effects of parameters such as the concentration of Nebivolol in the organic phase, the precipitation temperature, the solventantisolvent ratio and the time period of stirring on the particle size of nanosuspensions were investigated systematically, and the optimal value was 20 mg/ml, at room temp,1:30 and 15 min, respectively. The average particle size and zeta potential of nanosuspension were 197.6nmand-34.2mV (±6.01 mV), respectively. The morphology of nanosuspension was found to be ofregular morphology and rectangular in shape by scanning electron microscopy (SEM) observation. The X-ray powder diffraction (XRD) indicated that there was change in the nanosuspension compared with raw crystals i.e. crystalline drug changes into almost amorphous nature. FT-IR studies there is no chemical interaction between drug and excipients. The in-vitro dissolution rate of nebivolol was significantly increased by reducing the particle size.Exvivo studies shows adequate results.Selected formulation of film give suitable results in case of surface PH, folding endurance,disintegration test, drug content and drug release.Comparison studies show nanosuspension film gives faster and more drug release(93%).Stability studies also shown the acceptable results. © 2015, International Journal of Pharmacy and Technology. All rights reserved. Source

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