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Biosorption of hexavalent chromium from aqueous solutions by Catla catla scales / Kondapalli Srividya in Chemical engineering journal, Vol. 155 N° 3 (Decembre 2009) 

Public ISBD [article]  in Chemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 666-673 Titre : Biosorption of hexavalent chromium from aqueous solutions by Catla catla scales : equilibrium and kinetics studies Type de document : texte imprimé Auteurs : Kondapalli Srividya, Auteur ; Kaustubha Mohanty, Auteur Année de publication : 2010 Article en page(s) : pp. 666-673 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Biosorption  Chromium  Heavy  metal  Kinetics  Wastewater  treatment Index. décimale : 660 Résumé : In this work the potential of Catla catla scales to remove Cr(VI) ions from aqueous solutions was investigated as a function of time, initial Cr(VI) concentration, initial pH, biomass dose and agitation speed. Optimum biosorption conditions were found to be pH 1.0, 0.05 g L−1 biomass dosage, 200 rpm agitation speed and 180 min equilibrium time. The fitness of biosorption equilibrium data for Freundlich, Langmuir and Dubinin–Radushkevich isotherm models were tested. It was found that Freundlich model was better suitable for biosorption of Cr(VI) ions onto C. catla biomass. Three kinetic models viz. the Lagergren first-order and pseudo-second-order and intra-particle diffusion model were used to analyze the biosorption data and the results suggested that the pseudo-second-order model represented the best correlation. FTIR spectrum analysis revealed that O–H, N–H and C–O groups were the leading Cr(VI) binding groups. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X49YKT-6&_user=6 [...] [article] Biosorption of hexavalent chromium from aqueous solutions by Catla catla scales : equilibrium and kinetics studies [texte imprimé] / Kondapalli Srividya, Auteur ; Kaustubha Mohanty, Auteur . - 2010 . - pp. 666-673. Génie Chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 666-673 Mots-clés : Biosorption  Chromium  Heavy  metal  Kinetics  Wastewater  treatment Index. décimale : 660 Résumé : In this work the potential of Catla catla scales to remove Cr(VI) ions from aqueous solutions was investigated as a function of time, initial Cr(VI) concentration, initial pH, biomass dose and agitation speed. Optimum biosorption conditions were found to be pH 1.0, 0.05 g L−1 biomass dosage, 200 rpm agitation speed and 180 min equilibrium time. The fitness of biosorption equilibrium data for Freundlich, Langmuir and Dubinin–Radushkevich isotherm models were tested. It was found that Freundlich model was better suitable for biosorption of Cr(VI) ions onto C. catla biomass. Three kinetic models viz. the Lagergren first-order and pseudo-second-order and intra-particle diffusion model were used to analyze the biosorption data and the results suggested that the pseudo-second-order model represented the best correlation. FTIR spectrum analysis revealed that O–H, N–H and C–O groups were the leading Cr(VI) binding groups. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X49YKT-6&_user=6 [...]

Biosorptive uptake of Cr(VI) from aqueous solutions by Parthenium hysterophorous weed / V. Venugopal in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011) 

Public ISBD [article]  in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.151-158 Titre : Biosorptive uptake of Cr(VI) from aqueous solutions by Parthenium hysterophorous weed : Equilibrium, kinetics and thermodynamic studies Type de document : texte imprimé Auteurs : V. Venugopal, Auteur ; Kaustubha Mohanty, Auteur Année de publication : 2012 Article en page(s) : pp.151-158 Note générale : Génie chimique Langues : Anglais (eng) Mots-clés : Adsorption  Cr(VI)  Kinetics  Thermodynamics  Wastewater  treatment  Waste  biomass Résumé : In the present work the potential of Parthenium (P. hysterophorus L.) weed to remove Cr(VI) ions from aqueous solution was reported. FTIR was used to study the functional groups present on the surface of the biosorbent and it was found that carboxyl, amine and alkane groups were the leading Cr binding groups. Effect of various parameters such as contact time, temperature, pH, agitation speed, biosorbent dose and initial Cr(VI) concentration on the biosorption was investigated by batch process. The equilibrium data was well described by both Langmuir and Freundlich isotherms. The biosorption capacity of Parthenium weed for Cr(VI) was found. Highlights: A new biosorbent was developed from waste weed of Parthenium. Biosorbent developed was low-cost and renewable in nature. It was used successfully for removal of Cr(VI) ions from aqueous solutions. Maximum adsorption was found to ne 24.5mg/g at optimized conditions. The developed biosorbent has the potential of removing Cr(VI) in an environmentally friendly process. ISSN : 1385-8947 En ligne : http://scienceindex.com/stories/1823781/Biosorptive_uptake_of_CrVI_from_aqueous_ [...] [article] Biosorptive uptake of Cr(VI) from aqueous solutions by Parthenium hysterophorous weed : Equilibrium, kinetics and thermodynamic studies [texte imprimé] / V. Venugopal, Auteur ; Kaustubha Mohanty, Auteur . - 2012 . - pp.151-158. Génie chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.151-158 Mots-clés : Adsorption  Cr(VI)  Kinetics  Thermodynamics  Wastewater  treatment  Waste  biomass Résumé : In the present work the potential of Parthenium (P. hysterophorus L.) weed to remove Cr(VI) ions from aqueous solution was reported. FTIR was used to study the functional groups present on the surface of the biosorbent and it was found that carboxyl, amine and alkane groups were the leading Cr binding groups. Effect of various parameters such as contact time, temperature, pH, agitation speed, biosorbent dose and initial Cr(VI) concentration on the biosorption was investigated by batch process. The equilibrium data was well described by both Langmuir and Freundlich isotherms. The biosorption capacity of Parthenium weed for Cr(VI) was found. Highlights: A new biosorbent was developed from waste weed of Parthenium. Biosorbent developed was low-cost and renewable in nature. It was used successfully for removal of Cr(VI) ions from aqueous solutions. Maximum adsorption was found to ne 24.5mg/g at optimized conditions. The developed biosorbent has the potential of removing Cr(VI) in an environmentally friendly process. ISSN : 1385-8947 En ligne : http://scienceindex.com/stories/1823781/Biosorptive_uptake_of_CrVI_from_aqueous_ [...]

Quantum chemical based screening of ionic liquids for the extraction of phenol from aqueous solution / Sidhartha Mohanty in Industrial & engineering chemistry research, Vol. 49 N° 6 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2916–2925 Titre : Quantum chemical based screening of ionic liquids for the extraction of phenol from aqueous solution Type de document : texte imprimé Auteurs : Sidhartha Mohanty, Auteur ; Tamal Banerjee, Auteur ; Kaustubha Mohanty, Auteur Année de publication : 2010 Article en page(s) : pp. 2916–2925 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Screening--Chemical--Quantum--Liquids--Ionic--Phenol--Aqueous  Solution Résumé : Room-temperature ionic liquids (ILs), because of their various advantages, are superior extractants than the traditional volatile organic solvents (VOCs) used for liquid−liquid extraction. This work reports the judicious screening of various ILs for the extraction of phenol from aqueous solutions. A quantum chemical based “conductor-like screening model for real solvents” (COSMO-RS) is used for the prediction of selectivity of phenol in aqueous medium at infinite dilution. A combination of 16 cations and 26 anions, which resulted in 416 possible ILs, is used to determine the best extractant for the removal of phenol from aqueous solutions. During the screening process, [TBTDP] and [OMIM] gave the highest selectivity among the phosphonium and imidazolium based cations, respectively. Similarly, the favorable anions are those where no sterical shielding effect around their charge centers exists, such as [CH3SO3], [OAc], [Cl], and [Br]. The best IL screened is [OMIM][Dec], which gave the highest selectivity of 111. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901684q [article] Quantum chemical based screening of ionic liquids for the extraction of phenol from aqueous solution [texte imprimé] / Sidhartha Mohanty, Auteur ; Tamal Banerjee, Auteur ; Kaustubha Mohanty, Auteur . - 2010 . - pp. 2916–2925. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2916–2925 Mots-clés : Screening--Chemical--Quantum--Liquids--Ionic--Phenol--Aqueous  Solution Résumé : Room-temperature ionic liquids (ILs), because of their various advantages, are superior extractants than the traditional volatile organic solvents (VOCs) used for liquid−liquid extraction. This work reports the judicious screening of various ILs for the extraction of phenol from aqueous solutions. A quantum chemical based “conductor-like screening model for real solvents” (COSMO-RS) is used for the prediction of selectivity of phenol in aqueous medium at infinite dilution. A combination of 16 cations and 26 anions, which resulted in 416 possible ILs, is used to determine the best extractant for the removal of phenol from aqueous solutions. During the screening process, [TBTDP] and [OMIM] gave the highest selectivity among the phosphonium and imidazolium based cations, respectively. Similarly, the favorable anions are those where no sterical shielding effect around their charge centers exists, such as [CH3SO3], [OAc], [Cl], and [Br]. The best IL screened is [OMIM][Dec], which gave the highest selectivity of 111. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901684q