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Patil S.P.,Nano Chemistry Research Laboratory | Shrivastava V.S.,Nano Chemistry Research Laboratory | Sonawane G.H.,Commerce and Science College | Sonawane S.H.,National Institute of Technology Warangal
Journal of Environmental Chemical Engineering | Year: 2015

Novel Bi2O3-montmorillonite nanocomposite photocatalyst was synthesized and characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). Effect of Bi2O3 intercalation with montmorillonite clay on photocatalytic performance of Bi2O3-montmorillonite under visible light irradiation was systematically investigated. The results indicate that Bi2O3-montmorillonite shows enhanced adsorption and photocatalytic performance for Congo red (CR) removal under visible light irradiation. Higher rate of light absorption and lower rate electron-hole pair recombination are responsible for the increase in photocatalytic efficiency. Adsorption of CR on Bi2O3-montmorillonite follows pseudo-second-order kinetics and the adsorption isotherm follows Freundlich isotherm. The monolayer capacity was observed to be 500 mg g-1. The maximum percentage removal achieved upto 86.4% at pH 9 for 2 g L-1 photocatalyst dose. Photocatalytic degradation of CR by Bi2O3-montmorillonite proceeds via advanced oxidative process. © 2015 Elsevier Ltd. All rights reserved. Source


Patil S.P.,Nano Chemistry Research Laboratory | Patil R.P.,Commerce and Science College | Mahajan V.K.,Commerce and Science College | Sonawane G.H.,Commerce and Science College | And 2 more authors.
Materials Science in Semiconductor Processing | Year: 2016

The BiOBr-graphene oxide (BiOBr-GO) nanocomposite was successfully synthesized by sonochemical method. The as-synthesized nanocomposite was characterized by Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). The effect of incorporation of graphene-oxide with BiOBr on photocatalytic performance of BiOBr under exposure of UV-Visible light irradiation was systematically investigated. The percent removal of Direct green by BiOBr-GO at pH 7 was found to be 91.9% while by pure BiOBr it was 37%. This exhibits that BiOBr-GO shows enhanced adsorption and photocatalytic performance for removal of Direct green under UV-Visible light irradiation. Mechanism of Direct green degradation can be explained by AOP involving heterogeneous photocatalysis. The probable mechanism of photocatalytic degradation and mineralization of Direct green also explained by LC-MS analysis. The mineralization efficiency indicates the 91.7% TOC removal for the degradation of Direct green by BiOBr-GO. © 2016 Elsevier Ltd. All rights reserved. Source


Marathe Y.V.,Nano Chemistry Research Laboratory | Shrivastava V.S.,Nano Chemistry Research Laboratory
Advanced Science Letters | Year: 2012

The photocatalytic degradation of azo dye indigo caramine was investigated using CdS thin films in aqueous solution under irradiation of mercury lamp. CdS nanocrystaline thin films were prepared by using sol gel dip coating method. The surface characterization, morphology and crystal size were examined by SEM and XRD techniques. The size of CdS nanoparticle was found to be 45 nm. SEM revealed that film was uniform and without any cracks. Optical characterization of thin film was performed by UV Visible spectroscopy. CdS film shows high transmittance i.e., more than 60% and increases with increase in wavelength. Absorption band edge found in the wavelength ranges 350-450 nm. The optical band gap of sol gel deposited thin film is found to be 2.84 eV. The obtained nanocrystaline CdS thin film was employed in experiment of photocatalytic oxidation of water soluble indigo caramine azo dye. The effect of operational parameters i.e., pH of the solution, dye concentration, irradiation time, solar irradiation and reusability of photocatalyst on rate of degradation of azo dye in aqueous solution was examined. The best conditions for maximum photocatalytic degradation of indigo caramine were found; acidic pH, solar irradiation and 40 ppm initial dye concentration. The mineralization of indigo caramine dye was examine by TOC. © 2012 American Scientific Publishers. All rights reserved. Source


Patil S.P.,Nano Chemistry Research Laboratory | Bethi B.,National Institute of Technology Warangal | Sonawane G.H.,Commerce and Science College | Shrivastava V.S.,Nano Chemistry Research Laboratory | Sonawane S.,National Institute of Technology Warangal
Journal of Industrial and Engineering Chemistry | Year: 2016

Bi2O3-bentonite nanocomposites successfully synthesized by intercalation method, are used for photocatalytic degradation of Rhodamine B (Rh B) under visible light irradiation. Bi2O3-bentonite shows enhanced photocatalytic efficiency than pure Bi2O3 due to intercalation with bentonite. Removal of Rh B is achieved upto 98.5% using 3 gL-1 photocatalyst at pH 3. It is found that increase in light absorption and decrease in electron-hole recombination enhances photocatalytic efficiency. Photocatalytic degradation of Rh B by Bi2O3-bentonite proceeds via advanced oxidative process. The plausible mechanism of photocatalytic degradation Rh B reported by LC-MS shows generation of different degradation products including benzoic acid and benzonium ion. © 2015 The Korean Society of Industrial and Engineering Chemistry. Source


Patil S.P.,Nano Chemistry Research Laboratory | Shrivastava V.S.,Nano Chemistry Research Laboratory | Sonawane G.H.,Commerce and Science College
Desalination and Water Treatment | Year: 2015

Montmorillonite clay was incorporated with ZnO to get ZnO-montmorillonite nanocomposite. This nanocomposite was successfully used for removal of Rhodamine 6G by photocatalytic degradation and adsorption. The influence of contact time, initial dye concentration, pH and catalyst dose has been determined. Contact time of 80 min and pH 3 was optimized for photocatalytic degradation of Rhodamine 6G. Kinetic parameters like pseudo-first-order, pseudo-second-order, Elovich and intraparticle diffusion model were determined. Pseudo-second-order kinetics could describe the adsorption kinetics well with r2 > 0.997 for 20–150 mg/L dye concentrations. Adsorption isotherms like Langmuir and Freundlich isotherm are used to describe the adsorption of dye. The monolayer capacity was observed to be 200 mg/g. Freundlich adsorption isotherm was found to fit better than Langmuir isotherm. Removal of Rhodamine 6G could be increased by combine effect of photocatalytic degradation and adsorption by nanocomposite. © 2014, © 2014 Balaban Desalination Publications. All rights reserved. Source

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