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RISS 인기검색어
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- 저자 : Smita Gupta (검색결과 6 건)
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Mixed Matrix PVA-GO-TiO2 Membranes for the Dehydration of Isopropyl Alcohol by Pervaporation
Smita Gupta,Ganesh B. Thorat,Z.V.P. Murthy 한국고분자학회 2020 Macromolecular Research Vol.28 No.6
In the current work, mixed matrix membranes of polyvinyl alcohol (PVA)- graphene oxide (GO)-titanium dioxide (TiO2) were prepared using a solvent evaporation technique for the separation of isopropyl alcohol from its azeotropic mixture with water by pervaporation. In this work, the effects of the feed water concentration in the range of 10%-40% and the feed temperature of 50-80 oC have been investigated. The characterization of membranes was done by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and the contact angle measurements. The Arrhenius activation energy for permeation was determined to be in the range of 8-12.8 kJ/mol. The results of the diffusion coefficient values and the Arrhenius activation energy parameters showed that the waterselectivity was improved at higher concentrations of GO-TiO2.
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Smita Gupta,Mousumi Chakraborty,Z.V.P. Murthy 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
In this work, extraction of bisphenol A (BPA) from aqueous solutions by hollow fiber supported liquid membrane is studied. The study had focused on the effects of various parameters, viz., hydrodynamic conditions, type of diluent, feed- and stripping- phase concentrations. Response surface method was adopted to determine the interactive effect of feed and stripping phase concentrations on BPA transport. At optimum conditions, 96% BPA extraction is achieved from aqueous solutions within 9.0 h cycle-time. A mass transfer model was developed, and the aqueous and membrane resistances were evaluated to be 5.78 × 102 s cm-1 and 5.85 × 104 s cm-1, respectively.
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( Mahesh Khot ),( Rohini Gupta ),( Kadambari Barve ),( Smita Zinjarde ),( Sanjay Govindwar ),( Ameeta Ravikumar ) 한국미생물 · 생명공학회 2015 Journal of microbiology and biotechnology Vol.25 No.4
This study evaluated the microbial conversion of coconut oil waste, a major agro-residue in tropical countries, into single cell oil (SCO) feedstock for biodiesel production. Copra cake was used as a low-cost renewable substrate without any prior chemical or enzymatic pretreatment for submerged growth of an oleaginous tropical mangrove fungus, Aspergillus terreus IBB M1. The SCO extracted from fermented biomass was converted into fatty acid methyl esters (FAMEs) by transesterification and evaluated on the basis of fatty acid profiles and key fuel properties for biodiesel. The fungus produced a biomass (8.2 g/l) yielding 257 mg/g copra cake SCO with ~98% FAMEs. The FAMEs were mainly composed of saturated methyl esters (61.2%) of medium-chain fatty acids (C12-C18) with methyl oleate (C18:1; 16.57%) and methyl linoleate (C18:2; 19.97%) making up the unsaturated content. A higher content of both saturated FAMEs and methyl oleate along with the absence of polyunsaturated FAMEs with ≥4 double bonds is expected to impart good fuel quality. This was evident from the predicted and experimentally determined key fuel properties of FAMEs (density, kinematic viscosity, iodine value, acid number, cetane number), which were in accordance with the international (ASTM D6751, EN 14214) and national (IS 15607) biodiesel standards, suggesting their suitability as a biodiesel fuel. The low cost, renewable nature, and easy availability of copra cake, its conversion into SCO without any thermochemical pretreatment, and pelleted fungal growth facilitating easier downstream processing by simple filtration make this process cost effective and environmentally favorable.
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( Manju Chandankhede ),( Madhur Gupta ),( Smita Pakhmode ) 대한폐경학회 2021 대한폐경학회지 Vol.27 No.3
Objectives: During menopause, women may experience some physical changes that can affect their psychological status. Oxidative stress also increases with menopause, as decreasing levels of estrogen reinforce the deterioration of antioxidant status. To assess total antioxidative capacity, malondialdehyde, superoxide dismutase, and glutathione peroxidase and the correlation between psychological status and oxidative stress in postmenopausal women. Methods: This cross-sectional study was undertaken on 100 postmenopausal women (40-59 years). Blood malondialdehyde, superoxide dismutase, glutathione peroxidase, and total antioxidative capacity were analyzed, and psychological status was assessed using Rosenberg’s self-esteem test, Zung’s self-rating anxiety scale, and Zung’s self-rating depression scale. Results: Of the women, 38.0% had mild to moderate symptoms of anxiety (mean ± standard deviation, 50.15 ± 4.89), 21.0% showed depression, and 19.0% had low self-esteem. Twelve percent of the study population had mild to moderate symptoms of all three disorders. A statistically significant difference was found in the scores of anxiety and self-esteem (P = 0.001 and P < 0.001 in women with and without psychological disturbances, respectively). With regard to oxidative stress parameters, only superoxide dismutase levels showed a statistically significant difference (P = 0.001), with lower levels found in women with psychological disturbance. Conclusions: Women with depression, anxiety, and low self-esteem are in an oxidative challenge, which might be associated with estrogen depletion. A lower superoxide dismutase level is associated with higher depression and anxiety scores in postmenopausal women.
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Amit Kumar Singh,Bishnu Prasad Panda,Smita Mohanty,Sanjay Kumar Nayak,Manoj Kumar Gupta 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.11
The current study reports the effect of low viscous aliphatic reactive diluent (RD), MWCNT and VGCF on the curing kinetics of amine cured epoxy adhesive system employing non-isothermal differential scanning calorimetric (DSC) technique. Non-isothermal DSC thermograms of epoxy adhesive were studied at various heating rates: 5, 10 and 15 oC/min. The decrease in the exothermic peak height with the introduction of MWCNTs and VGCFs was taken as proof of the acceleration effect of nano-fillers on the epoxy-amine curing reaction. Also, increased Tonset, TP and ΔHcurs values were observed for epoxy/RD adhesive system at all heating rates. The value of activation energy (Ea) was determined using Kissinger and Flynn-Wall-Ozawa methods. Experimental results showed that the addition of 10 wt% RD increased the Ea from 60 to 63 kJ/mol on account of the reduced viscosity, allowing better contact of resin with the curing agent. Furthermore, MWCNTs have an accelerating effect on the cure kinetics that does not change the autocatalytic cure reaction mechanism of epoxy resin. It was also found that the addition of MWCNT and VGCF decreases the overall degree of conversion, as evident with lower ΔHcure and Ea of the cured adhesive when compared with epoxy/RD system. The dependency of Ea on degree of conversion ranging from α =0.1 to 0.9was also investigated. The two normalized functions y(α) and z(α) were also considered in order to study the complex curing mechanism. The kinetic parameters m, n and lnA were obtained by using two parameter autocatalytic Sestak-Berggren model. The curves revealed good agreement between experimentally determined and theoretically obtained MWCNT/VGCF reinforced epoxy adhesive systems.
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