Papers by KULAMANI PARIDA
Dalton Transactions, 2012
A series of tungstate promoted β-SiC catalysts was synthesized by a wetness impregnation method. ... more A series of tungstate promoted β-SiC catalysts was synthesized by a wetness impregnation method. The as synthesized catalysts were unambiguously characterized by XRD, Raman, FTIR, XPS, UV-Vis DRS, TEM, BET surface areas and FE-SEM, and simultaneously the total amount of the acidity of the catalysts was estimated by NH(3)-TPD. The catalytic activities of the synthesized materials were tested in the liquid phase esterification of acetic acid with n-butanol in a solvent free medium. The reaction parameters were optimized to a temperature of 120 °C, molar ratio of butanol and acetic acid of 1:2 and a reaction time of 6 h after performing a number of experiments. Under the optimum conditions, the catalytic esterification revealed a significant effect of 88% conversion with 100% selectivity to butyl acetate in 20 wt% WO(3)/β-SiC. This is the first report on the effective utilization of β-SiC as a catalyst support for liquid phase esterification of acetic acid.
Nanoscale, 2019
Efficient hydrogen evolution is achieved over a B-rGO/PbTiO3 p–n heterojunction with an energy co... more Efficient hydrogen evolution is achieved over a B-rGO/PbTiO3 p–n heterojunction with an energy conversion efficiency of 19.28%.
ChemistrySelect, 2019
In this study, first time the nanometric powder of La 2 Ti 2 O 7 (abbreviated as LTO) is taken as... more In this study, first time the nanometric powder of La 2 Ti 2 O 7 (abbreviated as LTO) is taken as the electrode material for supercapacitor. The prepared material is characterized by various characterization techniques to know its structural and textural properties. The specific capacitance of the La 2 Ti 2 O 7 is calculated from charge discharge curve. The Nyquist plot, bode plot and the plot of real capacitance vs. imaginary capacitance is well in support of supercapacitive activity of La 2 Ti 2 O 7. The La 2 Ti 2 O 7 exhibits 71 F/g of specific capacitance in 2 M KOH with 95.7% retention after 5000 cycles is due to the effective access of electrolyte to the redox sites owing to its layered structure. As these finding are new to the scientific community and demonstrate the great potential of La 2 Ti 2 O 7 as electrode material for supercapacitor, the current findings may give a new pave in the area of supercapacitor research.
Inorganic Chemistry, 2013
With the purpose of efficient electron−hole separation and enhancement of photocatalytic performa... more With the purpose of efficient electron−hole separation and enhancement of photocatalytic performance in the visible region, we have fabricated a novel p-BiOI/n-ZnTiO 3 heterojunction by a precipitation−deposition method and studied its activity toward dye degradation. The physicochemical characteristics of the fabricated BiOI/ ZnTiO 3 heterojunctions were surveyed by powder X-ray diffraction pattern (PXRD), BET-surface area, diffuse reflectance UV−vis (DRUV−vis), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), photoluminescence spectroscopy (PL spectra), X-ray photoelectron spectroscopy (XPS), and photoelectrochemical measurement. The photosensitization effect of BiOI enhanced the spectral response of ZnTiO 3 from UV to visible region, making all the BiOI/ZnTiO 3 heterojunctions active under visible light. The PEC measurement confirmed the p-type character of BiOI and n-type character of ZnTiO 3. The optimal amount of BiOI in BiOI/ ZnTiO 3 heterojunctions was found to be 50% which degraded 82% of 50 ppm Rh 6G under visible light irradiation. The degradation rate of 50% BiOI/ZnTiO 3 heterojunction was found to be 9.8 and 11.1 times higher than that of bare BiOI and ZnTiO 3 , respectively. The photosensitization effect of BiOI and the formed heterojunction between p-type BiOI and n-type ZnTiO 3 contribute to improved electron−hole separation and enhancement in photocatalytic activity.
Environmental Science & Technology, 2010
Mesoporous S,N-TiO(2) nanocomposite was prepared by a one-pot template free homogeneous coprecipi... more Mesoporous S,N-TiO(2) nanocomposite was prepared by a one-pot template free homogeneous coprecipitation technique using titanium oxysulfate sulfuric acid complex hydrate, thiourea, ethanol, and water. Nano gold deposition on mesoporous S,N-TiO(2) was preformed by a borohydrate reduction method. To evaluate the structural and electronic properties, these catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HR-TEM), UV-vis DRS, photoluminescent (PL) spectra, Fourier transform infrared (FTIR), and TPO/TPD. CO adsorption and CO + O(2) interaction over these catalysts were investigated by in situ FTIR. Sulfur and nitrogen doping enhances the catalytic activity of Au/TiO(2.) Higher catalytic activity of Au/S,N-TiO(2) compared to Au/TiO(2) was attributed to the presence of oxygen vacancy and creation of new adsorption sites at Au/TiO(2) interfaces for the adsorption and activation of O(2) molecules.
Atmospheric Environment, 1997
Results of national methane campaign launched in 1991 to assess methane budget from Indian paddy ... more Results of national methane campaign launched in 1991 to assess methane budget from Indian paddy fields are reported. The campaign involved a number of scientific institutions and universities with National Physical Laboratory at Delhi operating as a nodal agency and covered most of the major rice growing regions of India. Methane emission rates ranged between-0.64 and 84.1 mg m'2h "1. The methane budget from Indian paddies has been estimated to be around 4.0 TgY l with a range between 2.7 to 5.4 TgY m.
Graphene Technology, 2019
Mesoporous reduced graphene oxide nanoparticles (RGO NPs) have been synthesized by using differen... more Mesoporous reduced graphene oxide nanoparticles (RGO NPs) have been synthesized by using different templates. Three types of RGO NPs, namely mesoporous RGO1 NPs, RGO2 NPs and RGO3 NPs, have been synthesized by using cetyltrimethylammonium bromide (CTAB), polyethylene glycol (PEG) and polyethylene glycol-polypropylene glycol-polyethylene glycol (Pluronic P123), respectively. In the present study, CTAB, PEG and P123 are used as both template and capping agent for the formation of mesoporous RGO NPs. N 2 sorption, XRD, XPS and Raman spectra have proved the mesoporous and NPs nature of the RGO samples. It has been observed that mesoporous RGO NPs samples have high adsorption of dyes molecules like as methylene blue, malachite green and rhodamine 6G. Among them, mesoporous RGO1 NPs exhibited the highest dye adsorption capacity.
Dalton Transactions, 2013
A mesoporous iron modified Al2O3 nanoparticle pillared montmorillonite nanocomposite (mesoporous ... more A mesoporous iron modified Al2O3 nanoparticle pillared montmorillonite nanocomposite (mesoporous Fe/APM nanocomposite) was synthesized by using sodium exchanged montmorillonite by cation-exchange, gallery-templated synthesis and impregnation method. Formation of Al2O3 nanoparticles (Al2O3 NPs) having average particle size 5.20-6.50 nm within montmorillonite, formation of mesoporous Al2O3 NPs pillared montmorillonite (mesoporous APM) from montmorillonite and formation of a mesoporous Fe/APM nanocomposite signifies the present investigation. The roles of ammonia, CTAB, octyl amine and calcination temperature for fabrication of mesoporous Fe/APM nanocomposite were highly significant. Ammonia was used for post-synthesis treatment, which helped in the formation of micellar assemblies in the interlayer space. The materials were characterized by different techniques such as N2 adsorption-desorption study, which demonstrated the mesoporosity of the material. A transmission electron microscopy (TEM) image proves the morphology and size of the Al2O3 NPs and mesoporous Fe/APM nanocomposites. X-ray diffraction technique (XRD) describes the formation of the pillaring of the Al2O3 NPs within montmorillonite (APM). It has been noted that pure montmorillonite is a micro/mesoporous material. But after pillaring of Al2O3 NPs within the montmorillonite, mesoporosity developed, which is the vital aspect of present investigation. It was observed that the mesoporous Fe/APM nanocomposite has high photo-Fenton activity towards degradation of organic dyes such as acid blue (AB) and reactive blue (RB). Nearly 100% degradation took place within 30 minutes with high concentration of dye (500 mg L(-1)) by mesoporous 5 Fe/APM nanocomposite under ambient conditions. Small particle sizes of nanocomposite, quick reduction of Fe(III) and mesoporosity are the key points for proficient degradation of AB and RB.
Journal of Materials Science Letters, 1987
Journal of Colloid and Interface Science, Oct 1, 2019
Construction of M-BiVO 4 /T-BiVO 4 isotype heterojunction for enhanced photocatalytic degradation... more Construction of M-BiVO 4 /T-BiVO 4 isotype heterojunction for enhanced photocatalytic degradation of Norfloxacine and Oxygen evolution reaction,
Advanced Materials for Wastewater Treatment, 2017
Chemischer Informationsdienst, 1981
ChemInform Abstract Nach Untersuchungen in den Temp.-und pH-Bereichen 20-35 rc C bzw. 3-14 wird i... more ChemInform Abstract Nach Untersuchungen in den Temp.-und pH-Bereichen 20-35 rc C bzw. 3-14 wird im pH-Bereich 3-8 Mn" als aktiver Platz angesehen und im Bereich 8-14 das Mn3+-Ion. Die katalytische Aktivität erreicht beim pH 11.5-12.0 ein Maximum. Die experimentellen Geschwindigkeitswerte stimmen befriedigend mit einem entsprechenden Mechanismusüberein. Die katalytische Aktivität lässt sich mit einigen physikalisch-chemischen Eigenschaften wie Oberflächensauerstoff und-OH-Gruppen sowie Gitterparametern korrelieren und hängt in komplexerer Weise mit der elektrochemischen oder Entladekapazität des MnOz zusammen. Für einige Proben (meist γ-MnOz) nimmt die Entladekapazität mit steigender katalytischer Aktivität zu, während eine Anzahl von Proben, die zu 04-, βund ('i-Modifikationen gehören, stark von diesem Verhalten abweichen. Eine Deutung dafür ergibt sich aus dem Zustand des im Wirtsgitter auftretenden MnOOH.
RSC Advances, 2015
The present review summarizes the recent development and challenges in visible light responsive m... more The present review summarizes the recent development and challenges in visible light responsive metal oxide based photocatalysts for water splitting.
RSC Adv., 2014
A Heterojunction of a β-SiC–TiO2 nanocomposite photocatalyst is found to be robust enough to achi... more A Heterojunction of a β-SiC–TiO2 nanocomposite photocatalyst is found to be robust enough to achieve high degree of Rhodamine-B degradation in presence of solar light.
International Journal of Advances in Engineering Sciences and Applied Mathematics, 2013
ABSTRACT The present investigation deals with the catalytic potential of Al-promoted vanadium pho... more ABSTRACT The present investigation deals with the catalytic potential of Al-promoted vanadium phosphate (Al-VPO) materials, where in it has been found that Al-VPO has unique bifunctional properties towards versatile organic reactions such as oxidation of methanol and esterification. Besides the industrial application of VPO towards n-butane oxidation to maleic anhydride, the vanadium phosphate material showed promising results in alcohol oxidation and esterification. The synthesized aluminium promoted VPO catalyst has been proven to be successful for acid catalysed reaction as well as oxidation reactions especially giving 100 % selectivity to formaldehyde and 90 % to ester. The conversion can be enhanced to 94 % with the sacrifice of the selectivity in case of alcohol oxidation.
ChemInform, 2013
ABSTRACT Bi2O3/Bi—NaTaO3 photocatalysts are prepared by solid state reaction of Bi(NO3)3, Ta2O5, ... more ABSTRACT Bi2O3/Bi—NaTaO3 photocatalysts are prepared by solid state reaction of Bi(NO3)3, Ta2O5, and Na2C2O4 using urea as complexing agent and fuel (600 °C, 4 h).
Separation Science and Technology, 1998
Description/Abstract The ion-exchange properties of amorphous aluminum phosphate have been studie... more Description/Abstract The ion-exchange properties of amorphous aluminum phosphate have been studied in aqueous electrolyte solutions of KCl over a temperature range of 300--320 K. The data were explained by the law of mass action. Sorption of Cu {sup 2+}, Ni {sup 2+} ...
Reaction Kinetics and Catalysis Letters, 1997
The physico-chemical properties as well as catalytic activity of some y-irradiated manganese nodu... more The physico-chemical properties as well as catalytic activity of some y-irradiated manganese nodules has been studied using 1-1202 decomposition and CO oxidation and were compared with the tmirradiated samples. The catalytic activities of irradiated nodules were correlated with various physico-chemical properties.
Journal of Molecular Catalysis A: Chemical, 2008
ABSTRACT The enhancing effect of sulphate ions added to titania supports for the oxidation of car... more ABSTRACT The enhancing effect of sulphate ions added to titania supports for the oxidation of carbon monoxide, catalyzed by gold, supported on the titania has been shown to be generally applicable to more than one type of titania. It seems from examining the characterization and catalytic data that the sulphate promotional effect is mainly due to a direct chemical effect on catalytically active sites.
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Papers by KULAMANI PARIDA