- Gangoh,Uttar Pradesh, India
Dr. Aayush Gupta
Thapar University, Patiala, SPMS, Graduate Student
- Aeronautical Engineering, Nanomaterials, X-ray Diffraction, Scanning Electron Microscopy, Transmission Electron Microscopy, Composite Materials, and 12 moreNano Composites, Refractory and advanced ceramics, Photocatalysis, Nanomaterial and photocatalysis, Heterogeneous photocatalysis, Photocatalysis and Nanotechnology, Photocatalytic water splitting, Visible Light Photocatalysis, Raman Spectroscopy, X-ray photoelectron spectroscopy (XPS), Hydrogen Production, and Solar Water Splittingedit
- Dr. O. P. Pandeyedit
In this reported work, the potential application of MnO 2 nanopowder for photocatalytic and the electrocatalytic applications is explored. The MnO 2 nanopowder has been synthesized through sonochemical route using KMnO 4 and poly-ethylene... more
In this reported work, the potential application of MnO 2 nanopowder for photocatalytic and the electrocatalytic applications is explored. The MnO 2 nanopowder has been synthesized through sonochemical route using KMnO 4 and poly-ethylene glycol as the reducing agent. Structural and optical analysis (XRD, TEM, FTIR, XPS and UV-visible) confirmed the formation of nanocrystalline MnO 2 network. The adsorption and photocatalytic performance of synthesized MnO 2 was tested for degradation of methylene blue dye and p-nitrophenol (2 mg/L) under dark chamber and household CFL lamp exposure, respectively. The electrochemical studies in alkaline (0.5 M KOH) medium shows the electric double layer capacitance of 7.4 mFcm −2 suggesting its potential application for energy storage devices. The synthesized compound exhibited excellent stability after 1000 CV cycles (∼4% current loss) where Volmer reaction was observed as the rate determining step for the electro-catalytic hydrogen evolution reaction.
Research Interests:
The rapid urbanisation, high population density in all the nations requires sustainable security systems at all the times which can protect their people and the belongings against burglaries. A zero-power...
Research Interests:
In a view to the treatment required to degrade organic effluents and also waste utilization, a non-treditional photocatalyst (NbC/C nanocomposite) has been synthesized by using Nb 2 O 5 and cigarette litter (filter) at relatively low... more
In a view to the treatment required to degrade organic effluents and also waste utilization, a non-treditional photocatalyst (NbC/C nanocomposite) has been synthesized by using Nb 2 O 5 and cigarette litter (filter) at relatively low temperature 800 °C. With the help of XRD diffraction technique, the synthesis parameters have been optimized to get NbC/C nanocomposite and studied their morphology by transmission electron microscopy (TEM). The synthesized nanocomposite NbC/C was used to study the photocatalytic degradation of methylene blue (MB) dye under visible light illumination. Further, the effect of concentration of dye and photocatalyst has been studied under same conditions. With the help of BET, UV–visible absorbance, XPS, mass spectrometry and total organic carbon analysis, degradation mechanism has been established for the optimized nanocomposite sample.
Research Interests:
In this reported work, the potential application of MnO 2 nanopowder for photocatalytic and the electrocatalytic applications is explored. The MnO 2 nanopowder has been synthesized through sonochemical route using KMnO 4 and poly-ethylene... more
In this reported work, the potential application of MnO 2 nanopowder for photocatalytic and the electrocatalytic applications is explored. The MnO 2 nanopowder has been synthesized through sonochemical route using KMnO 4 and poly-ethylene glycol as the reducing agent. Structural and optical analysis (XRD, TEM, FTIR, XPS and UV-visible) confirmed the formation of nanocrystalline MnO 2 network. The adsorption and photocatalytic performance of synthesized MnO 2 was tested for degradation of methylene blue dye and p-nitrophenol (2 mg/L) under dark chamber and household CFL lamp exposure, respectively. The electrochemical studies in alkaline (0.5 M KOH) medium shows the electric double layer capacitance of 7.4 mFcm −2 suggesting its potential application for energy storage devices. The synthesized compound exhibited excellent stability after 1000 CV cycles (∼4% current loss) where Volmer reaction was observed as the rate determining step for the electro-catalytic hydrogen evolution reaction.
Research Interests:
Undoped, Ca-doped NaNbO 3 and its heterostructure with g-C 3 N 4 have been successfully prepared through chemical route followed by heat treatment. All the prepared samples were analysed using XRD, FESEM, TEM and XPS spectroscopy for... more
Undoped, Ca-doped NaNbO 3 and its heterostructure with g-C 3 N 4 have been successfully prepared through chemical route followed by heat treatment. All the prepared samples were analysed using XRD, FESEM, TEM and XPS spectroscopy for various structural and surface features. Further, absorbance (UV-visible) and photo-luminescence (PL) spectroscopy revealed the bandgap narrowing and emission quenching, respectively as a result of doping and formation of heterojunction. Ca doped NaNbO 3-C 3 N 4 sample exhibited almost 100% photodegradation of methylene blue (MB) dye in 4 h. Here, the superoxide anion radical has been found as the active reactive oxidative species (ROS). Further, being a visible active catalyst, photocatalytic H 2 evolution has also been studied through water splitting under solar irradiations in which H 2 yield of 0.01, 0.03, 0.09 and 0.29 mmol (in 1 h) was observed using bare NaNbO 3 , Ca-NaNbO 3 , and their respective heterostructures, respectively. Modified oxygen vacancies and synergistic interracial interaction have induced such a noteworthy photocatalytic H 2 evolution ability of as-prepared heterostructure with 3.45 mmol H 2 yield 4 h of exposure.
Research Interests:
Niobium diboride (NbB 2) nanoparticles have been successfully synthesized at 800 C in a single step from niobium penta-oxide (Nb 2 O 5), magnesium (Mg) and borax (Na 2 B 4 O 7 $10H 2 O) in an autoclave. The synthesis temperature and... more
Niobium diboride (NbB 2) nanoparticles have been successfully synthesized at 800 C in a single step from niobium penta-oxide (Nb 2 O 5), magnesium (Mg) and borax (Na 2 B 4 O 7 $10H 2 O) in an autoclave. The synthesis temperature and holding time have been optimized to obtain single phase NbB 2. The phase determination, thermal stability and morphological features of synthesized samples have been analyzed by X-ray diffraction (XRD), thermal gravimetric-differential scanning calorimetry (TG-DSC) and electron microscopic technique respectively. Williamson-Hall (W-H) analysis has also been done to observe the effects of synthesis parameters (temperature and holding time) on crystal distortion. With the help of XRD, microstructural features and thermodynamic calculations, formation mechanism for the synthesized samples has been predicted.
In a view to the treatment required to degrade organic effluents and also waste utilization, a non-treditional photocatalyst (NbC/C nanocomposite) has been synthesized by using Nb 2 O 5 and cigarette litter (filter) at relatively low... more
In a view to the treatment required to degrade organic effluents and also waste utilization, a non-treditional photocatalyst (NbC/C nanocomposite) has been synthesized by using Nb 2 O 5 and cigarette litter (filter) at relatively low temperature 800 °C. With the help of XRD diffraction technique, the synthesis parameters have been optimized to get NbC/C nanocomposite and studied their morphology by transmission electron microscopy (TEM). The synthesized nanocomposite NbC/C was used to study the photocatalytic degradation of methylene blue (MB) dye under visible light illumination. Further, the effect of concentration of dye and photocatalyst has been studied under same conditions. With the help of BET, UV–visible absorbance, XPS, mass spectrometry and total organic carbon analysis, degradation mechanism has been established for the optimized nanocomposite sample.
Core-shell NbC/C nano composite has been synthesized by reacting niobium pentaoxide (Nb 2 O 5) with metallic magnesium and acetone (C 3 H 6 O). The ensued powder samples are characterized by X-ray dif-fraction (XRD), differential scanning... more
Core-shell NbC/C nano composite has been synthesized by reacting niobium pentaoxide (Nb 2 O 5) with metallic magnesium and acetone (C 3 H 6 O). The ensued powder samples are characterized by X-ray dif-fraction (XRD), differential scanning calorimetry/thermal gravimetric analysis (DSC/TGA), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET) analysis. The synthesis temperature, holding time and heating rate has been optimized to facilitate the in-situ reduction-carburization of Nb 2 O 5. The broadening of XRD diffraction peaks corresponding to NbC is analyzed using Williamson-Hall (W-H) analysis by calculating various parameters such as strain, stress, strain energy density for all the samples. The mean particle size of nano NbC is estimated by Scherrer's criterion which is highly correlated with W-H analysis in less stressed system. The electron microscopy analysis showed that particles have a partial faceted morphology along with carbon layer and having wide particle size distribution. BET analysis depicted large surface area having a combination of micropores and mesopores. All the results of various characterizations have been used to predict the mechanism of formation of core-shell NbC/C nano composite.