K. Mohanty - Academia.edu (original) (raw)

Papers by K. Mohanty

Emergency Medicine Journal, 2000

Biofuels, 2015

ABSTRACT The physiological factors for microalgae cultivation are the preliminary steps to overco... more ABSTRACT The physiological factors for microalgae cultivation are the preliminary steps to overcome the potential biomass demand. In this regard, the influence of light intensity (at six levels: 27, 40.5, 54, 67.5, 81 and 94.5 µmol m−2s−1) and pH conditions (5.0, 6.0, 7.0, 8.0 and 9.0) on the growth and lipid production of Scenedesmus species ADIITEC-II and GUBIOTJT116 was compared in the batch culture. Among the studied species, maximum specific growth (0.334 ± 0.002 day−1) and highest biomass yield (0.41 ± 0.021 g L−1) was achieved for Scenedesmus species ADIITEC-II at light intensity 81 µmol m−2s−1. Similarly, Scenedesmus species GUBIOTJT116 showed increased growth and biomass production at 81 µmol m−2s−1. However, illumination under 94.5 µmol m−2s−1 showed higher lipid production (0.533 ± 0.001 g L−1 and 0.551 ± 0.001 g L−1) for Scenedesmus sp. ADIITEC-II and GUBIOTJT116, respectively. The significant variation in effective pH tolerance, growth and biomass production was observed in the studied pH range. The result obtained in this study provides a potential insight of the strains and could be further explored to improve the biomass and lipid yield.

Physical review. B, Condensed matter, 1987

ABSTRACT We report the results of a high-resolution synchrotron x-ray scattering study of the mag... more ABSTRACT We report the results of a high-resolution synchrotron x-ray scattering study of the magnetic scattering from MnF2. The temperature dependence of the magnetic order parameter was obtained from the intensity of the direct magnetic scattering of x rays from the Mn2+ spins. The intense, highly collimated synchrotron beam allowed for a clear, extinction-free separation of the Bragg component from the diffuse scattering even very close to the Néel temperature TN. The excellent magnetic scattering signal-to-noise ratio should allow for the observation of critical scattering for temperatures within 1 mK of TN.

Fuel, 2014

ABSTRACT Brown coal is a soft sedimentary organic rock which is complex in nature and is the main... more ABSTRACT Brown coal is a soft sedimentary organic rock which is complex in nature and is the main source of energy production. In this work, we have studied the combustion and pyrolysis of brown coal using reactive molecular dynamic (MD) simulation. To make the large scale (above 1000 of atoms) reactive system practical, ReaxFF MD system was used which is 100 times faster than the methods of quantum mechanics (QM). To examine the pyrolysis/combustion process and initiation mechanism of brown coal, a fuel lean (phi = 2), fuel rich (phi = 0.5) and stoichiometric (phi = 1) conditions were used in this work. The temperature used was high as per experimental reported condition so as to enable chemical reaction within a computationally affordable time. It was observed that the combustion of brown coal was initialized by thermal degradation subsequently forming small fragments. As the brown coal molecule oxidizes or thermally decomposes, hydrogen is abstracted and reacts with oxygen to form large amount of H2O molecules. Furthermore, the combustion of coal was also studied in the same conditions namely fuel rich, fuel lean and stoichiometric. Potential energy gradually decreases at high temperature while it was the reverse in pyrolysis. It was found that the effects of densities are lesser as compared to temperature. Some important intermediate like formaldehyde (HCHO) generated during the simulation reaction agreed well with the experimental data reported in literature.

Separation and Purification Technology, 2008

In this work, a novel multi-stage external loop airlift reactor has been designed to remove pheno... more In this work, a novel multi-stage external loop airlift reactor has been designed to remove phenol from wastewater by means of its adsorption onto the surface of activated carbons. The multi-staging has been achieved by hydrodynamically induced continuous bubble generation, breakup and regeneration. The continuous rupture and bursting of bubbles creates localized turbulence and recirculation, which helps in faster transfer of trace pollutants to the active sites of the solid adsorbents. Thus, the pollutants get adsorbed to the surface of the solid adsorbents due to continuous agitation. Different operating parameters that affect the performance of the reactor are the superficial gas velocity, liquid circulation velocity, concentration of the pollutant present in wastewater, contact time and the carbon loading. The results show that the removal time as well as the activated carbon loading for this system were quite lower as compared to simple batch adsorption systems. The kinetic data were fitted to the models of intra-particle diffusion, pseudo-second-order and Lagergren, and followed more closely the Lagergren pseudo-first-order model. Langmuir and Freundlich models were used to study the adsorption isotherms. A correlation has been developed to predict the efficiency of percentage removal of phenol and found to be highly significant from statistical point of view.

Separation Science and Technology, 2011

This work reports the prediction of selective extraction of cresol from aqueous solutions using i... more This work reports the prediction of selective extraction of cresol from aqueous solutions using ionic liquids (ILs) as the solvent. Judicious screening of various ILs was carried out for all the three forms of cresol (ie, o-cresol, m-cresol and p-cresol). A quantum chemical based ...

Separation Science and Technology, 2010

Ceramic disc type microfiltration membranes (50 mm diameter and 5 mm thickness) were prepared by ... more Ceramic disc type microfiltration membranes (50 mm diameter and 5 mm thickness) were prepared by the paste method from different compositions of clay, kaolin, and binding agents like sodium carbonate, sodium metasilicate, boric acid, and sintered at different temperatures. All the ...

Physical Review Letters, 1986

... PHYSICAL REVIEW LETTERS Synchrotron X-Ray Study of a Fibonacci Superlattice J. Todd,(a) R. Me... more ... PHYSICAL REVIEW LETTERS Synchrotron X-Ray Study of a Fibonacci Superlattice J. Todd,(a) R. Merlin, and Roy Clarke Department of Physics, The University of Michigan, Ann Arbor, Michigan 48109 and KM Mohanty and JD Axe Physics Department, Brookhaven National ...

International Journal of Environmental Engineering, 2010

... Namasivayam, C. and Kavitha, D. (2002) 'Removal of Congo Red from water by adsorption on... more ... Namasivayam, C. and Kavitha, D. (2002) 'Removal of Congo Red from water by adsorption onto activated carbon prepared from coir pith, an agricultural solid waste', Dyes Pigments, Vol. 54, pp.47–58. Senthilkumar, S., Varadarajan, PR, Porkodi, K. and Subbhuraam, CV (2005 ...

Injury Extra, 2008

Results: It was noted that there was a delay of more than three days in taking the patients to th... more Results: It was noted that there was a delay of more than three days in taking the patients to theatre if wait and watch policy was adopted and the INR fell to levels below 2.0 in patients who were given vitamin K on admission within 12-24 h hence expediting their operation.

Chemical Engineering Journal, 2007

This paper reports on the experimental investigation carried out to evaluate the interfacial area... more This paper reports on the experimental investigation carried out to evaluate the interfacial area, a, and liquid-side volumetric mass transfer coefficient, k L a, to characterize a multi-stage external loop airlift reactor (with contraction and expansion disks), which has been conceived, designed, and fabricated as an equipment to remove trace pollutants from wastewater. In addition, it has versatile use as a gas-liquid contactor in chemical process industries. In the experimental range of gas and liquid flows investigated, the maximum interfacial area and volumetric mass transfer coefficient obtained was in the order of 300 m 2 /m 3 and 0.05 s −1 , respectively. Correlations developed for predicting the interfacial area and liquid-side volumetric mass transfer coefficient have been found to be encouraging and highly significant from statistical analysis.

Chemical Engineering Journal, 2007

Porous carbon prepared from rice husk using phosphoric acid activation through precarbonization a... more Porous carbon prepared from rice husk using phosphoric acid activation through precarbonization and chemical activation has been examined for the adsorption of phenol from aqueous solutions. The method adopted could produce carbons with micro and mesoporous structure. The surface area, pore volume and pore size distribution of carbon samples activated at three different temperatures 700, 800 and 900 • C have been carried out using nitrogen adsorption isotherms at 77 K. The production yield was observed to decrease with increase in activation temperature. Adsorption behavior of phenol onto the porous carbon was studied by varying the parameters such as agitation time, phenol concentration, pH and temperature. Studies showed that the adsorption decreased with increase in pH and temperature. The sorption process was found to be exothermic in nature. The kinetic models such as pseudo first order, pseudo second order and intra particle diffusion model were fitted to identify the mechanism of adsorption process. The isotherm data were fitted to Langmuir and Freundlich models. The maximum uptake of phenol was found to be 2.35 × 10 −4 mol/g at 20 • C and final pH 2.7.

Chemical Engineering & Technology, 2005

Activated carbons prepared from tamarind nutshell, an agricultural waste by-product, have been ex... more Activated carbons prepared from tamarind nutshell, an agricultural waste by-product, have been examined for the removal of phenol from aqueous solutions. The activated carbon was prepared by sulfuric acid activation. Both batch and column studies were performed for the sorption of phenol. The kinetic data were fitted to the models of Lagergren, pseudo-second-order and intraparticle diffusion, and closely followed the pseudo-second-order chemisorption model. The Freundlich and Langmuir isotherm models were well fitted. The solution pH greatly affects the sorption process. The column study results indicate that the sorption of phenol is dependent on the flow rate, the inlet phenol concentration as well as on the particle size of the adsorbent.

Bulletin of The Royal College of Surgeons of England, 2013

... column adsorber using activated carbon prepared from Tamarindus indica wood Suneel KUMAR, 1 K... more ... column adsorber using activated carbon prepared from Tamarindus indica wood Suneel KUMAR, 1 Kaustubha MOHANTY, 2,* and BC MEIKAP 3 1,3 Department of Chemical Engineering, Indian Institute of Technology Kharagpur, Kharagpur – 721302, India ...

Advanced oxidation process (AOP) followed by microfiltration (MF) was proposed for the removal of... more Advanced oxidation process (AOP) followed by microfiltration (MF) was proposed for the removal of crystal violet from aqueous solutions to save energy, time and cost. Fenton's reagent was used to degrade the dye. The optimal composition of Fenton's reagent for an initial dye ...

Emergency Medicine Journal, 2000

Biofuels, 2015

ABSTRACT The physiological factors for microalgae cultivation are the preliminary steps to overco... more ABSTRACT The physiological factors for microalgae cultivation are the preliminary steps to overcome the potential biomass demand. In this regard, the influence of light intensity (at six levels: 27, 40.5, 54, 67.5, 81 and 94.5 µmol m−2s−1) and pH conditions (5.0, 6.0, 7.0, 8.0 and 9.0) on the growth and lipid production of Scenedesmus species ADIITEC-II and GUBIOTJT116 was compared in the batch culture. Among the studied species, maximum specific growth (0.334 ± 0.002 day−1) and highest biomass yield (0.41 ± 0.021 g L−1) was achieved for Scenedesmus species ADIITEC-II at light intensity 81 µmol m−2s−1. Similarly, Scenedesmus species GUBIOTJT116 showed increased growth and biomass production at 81 µmol m−2s−1. However, illumination under 94.5 µmol m−2s−1 showed higher lipid production (0.533 ± 0.001 g L−1 and 0.551 ± 0.001 g L−1) for Scenedesmus sp. ADIITEC-II and GUBIOTJT116, respectively. The significant variation in effective pH tolerance, growth and biomass production was observed in the studied pH range. The result obtained in this study provides a potential insight of the strains and could be further explored to improve the biomass and lipid yield.

Physical review. B, Condensed matter, 1987

ABSTRACT We report the results of a high-resolution synchrotron x-ray scattering study of the mag... more ABSTRACT We report the results of a high-resolution synchrotron x-ray scattering study of the magnetic scattering from MnF2. The temperature dependence of the magnetic order parameter was obtained from the intensity of the direct magnetic scattering of x rays from the Mn2+ spins. The intense, highly collimated synchrotron beam allowed for a clear, extinction-free separation of the Bragg component from the diffuse scattering even very close to the Néel temperature TN. The excellent magnetic scattering signal-to-noise ratio should allow for the observation of critical scattering for temperatures within 1 mK of TN.

Fuel, 2014

ABSTRACT Brown coal is a soft sedimentary organic rock which is complex in nature and is the main... more ABSTRACT Brown coal is a soft sedimentary organic rock which is complex in nature and is the main source of energy production. In this work, we have studied the combustion and pyrolysis of brown coal using reactive molecular dynamic (MD) simulation. To make the large scale (above 1000 of atoms) reactive system practical, ReaxFF MD system was used which is 100 times faster than the methods of quantum mechanics (QM). To examine the pyrolysis/combustion process and initiation mechanism of brown coal, a fuel lean (phi = 2), fuel rich (phi = 0.5) and stoichiometric (phi = 1) conditions were used in this work. The temperature used was high as per experimental reported condition so as to enable chemical reaction within a computationally affordable time. It was observed that the combustion of brown coal was initialized by thermal degradation subsequently forming small fragments. As the brown coal molecule oxidizes or thermally decomposes, hydrogen is abstracted and reacts with oxygen to form large amount of H2O molecules. Furthermore, the combustion of coal was also studied in the same conditions namely fuel rich, fuel lean and stoichiometric. Potential energy gradually decreases at high temperature while it was the reverse in pyrolysis. It was found that the effects of densities are lesser as compared to temperature. Some important intermediate like formaldehyde (HCHO) generated during the simulation reaction agreed well with the experimental data reported in literature.

Separation and Purification Technology, 2008

In this work, a novel multi-stage external loop airlift reactor has been designed to remove pheno... more In this work, a novel multi-stage external loop airlift reactor has been designed to remove phenol from wastewater by means of its adsorption onto the surface of activated carbons. The multi-staging has been achieved by hydrodynamically induced continuous bubble generation, breakup and regeneration. The continuous rupture and bursting of bubbles creates localized turbulence and recirculation, which helps in faster transfer of trace pollutants to the active sites of the solid adsorbents. Thus, the pollutants get adsorbed to the surface of the solid adsorbents due to continuous agitation. Different operating parameters that affect the performance of the reactor are the superficial gas velocity, liquid circulation velocity, concentration of the pollutant present in wastewater, contact time and the carbon loading. The results show that the removal time as well as the activated carbon loading for this system were quite lower as compared to simple batch adsorption systems. The kinetic data were fitted to the models of intra-particle diffusion, pseudo-second-order and Lagergren, and followed more closely the Lagergren pseudo-first-order model. Langmuir and Freundlich models were used to study the adsorption isotherms. A correlation has been developed to predict the efficiency of percentage removal of phenol and found to be highly significant from statistical point of view.

Separation Science and Technology, 2011

This work reports the prediction of selective extraction of cresol from aqueous solutions using i... more This work reports the prediction of selective extraction of cresol from aqueous solutions using ionic liquids (ILs) as the solvent. Judicious screening of various ILs was carried out for all the three forms of cresol (ie, o-cresol, m-cresol and p-cresol). A quantum chemical based ...

Separation Science and Technology, 2010

Ceramic disc type microfiltration membranes (50 mm diameter and 5 mm thickness) were prepared by ... more Ceramic disc type microfiltration membranes (50 mm diameter and 5 mm thickness) were prepared by the paste method from different compositions of clay, kaolin, and binding agents like sodium carbonate, sodium metasilicate, boric acid, and sintered at different temperatures. All the ...

Physical Review Letters, 1986

... PHYSICAL REVIEW LETTERS Synchrotron X-Ray Study of a Fibonacci Superlattice J. Todd,(a) R. Me... more ... PHYSICAL REVIEW LETTERS Synchrotron X-Ray Study of a Fibonacci Superlattice J. Todd,(a) R. Merlin, and Roy Clarke Department of Physics, The University of Michigan, Ann Arbor, Michigan 48109 and KM Mohanty and JD Axe Physics Department, Brookhaven National ...

International Journal of Environmental Engineering, 2010

... Namasivayam, C. and Kavitha, D. (2002) 'Removal of Congo Red from water by adsorption on... more ... Namasivayam, C. and Kavitha, D. (2002) 'Removal of Congo Red from water by adsorption onto activated carbon prepared from coir pith, an agricultural solid waste', Dyes Pigments, Vol. 54, pp.47–58. Senthilkumar, S., Varadarajan, PR, Porkodi, K. and Subbhuraam, CV (2005 ...

Injury Extra, 2008

Results: It was noted that there was a delay of more than three days in taking the patients to th... more Results: It was noted that there was a delay of more than three days in taking the patients to theatre if wait and watch policy was adopted and the INR fell to levels below 2.0 in patients who were given vitamin K on admission within 12-24 h hence expediting their operation.

Chemical Engineering Journal, 2007

This paper reports on the experimental investigation carried out to evaluate the interfacial area... more This paper reports on the experimental investigation carried out to evaluate the interfacial area, a, and liquid-side volumetric mass transfer coefficient, k L a, to characterize a multi-stage external loop airlift reactor (with contraction and expansion disks), which has been conceived, designed, and fabricated as an equipment to remove trace pollutants from wastewater. In addition, it has versatile use as a gas-liquid contactor in chemical process industries. In the experimental range of gas and liquid flows investigated, the maximum interfacial area and volumetric mass transfer coefficient obtained was in the order of 300 m 2 /m 3 and 0.05 s −1 , respectively. Correlations developed for predicting the interfacial area and liquid-side volumetric mass transfer coefficient have been found to be encouraging and highly significant from statistical analysis.

Chemical Engineering Journal, 2007

Porous carbon prepared from rice husk using phosphoric acid activation through precarbonization a... more Porous carbon prepared from rice husk using phosphoric acid activation through precarbonization and chemical activation has been examined for the adsorption of phenol from aqueous solutions. The method adopted could produce carbons with micro and mesoporous structure. The surface area, pore volume and pore size distribution of carbon samples activated at three different temperatures 700, 800 and 900 • C have been carried out using nitrogen adsorption isotherms at 77 K. The production yield was observed to decrease with increase in activation temperature. Adsorption behavior of phenol onto the porous carbon was studied by varying the parameters such as agitation time, phenol concentration, pH and temperature. Studies showed that the adsorption decreased with increase in pH and temperature. The sorption process was found to be exothermic in nature. The kinetic models such as pseudo first order, pseudo second order and intra particle diffusion model were fitted to identify the mechanism of adsorption process. The isotherm data were fitted to Langmuir and Freundlich models. The maximum uptake of phenol was found to be 2.35 × 10 −4 mol/g at 20 • C and final pH 2.7.

Chemical Engineering & Technology, 2005

Activated carbons prepared from tamarind nutshell, an agricultural waste by-product, have been ex... more Activated carbons prepared from tamarind nutshell, an agricultural waste by-product, have been examined for the removal of phenol from aqueous solutions. The activated carbon was prepared by sulfuric acid activation. Both batch and column studies were performed for the sorption of phenol. The kinetic data were fitted to the models of Lagergren, pseudo-second-order and intraparticle diffusion, and closely followed the pseudo-second-order chemisorption model. The Freundlich and Langmuir isotherm models were well fitted. The solution pH greatly affects the sorption process. The column study results indicate that the sorption of phenol is dependent on the flow rate, the inlet phenol concentration as well as on the particle size of the adsorbent.

Bulletin of The Royal College of Surgeons of England, 2013

... column adsorber using activated carbon prepared from Tamarindus indica wood Suneel KUMAR, 1 K... more ... column adsorber using activated carbon prepared from Tamarindus indica wood Suneel KUMAR, 1 Kaustubha MOHANTY, 2,* and BC MEIKAP 3 1,3 Department of Chemical Engineering, Indian Institute of Technology Kharagpur, Kharagpur – 721302, India ...

Advanced oxidation process (AOP) followed by microfiltration (MF) was proposed for the removal of... more Advanced oxidation process (AOP) followed by microfiltration (MF) was proposed for the removal of crystal violet from aqueous solutions to save energy, time and cost. Fenton's reagent was used to degrade the dye. The optimal composition of Fenton's reagent for an initial dye ...