Documents disponibles écrits par cet auteur

Design and synthesis of polymer-bound penta-aza ligand for selective adsorptive separation of cobalt(II) from zirconium(IV) / Pradipta Kumar in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8195-8203 Titre : Design and synthesis of polymer-bound penta-aza ligand for selective adsorptive separation of cobalt(II) from zirconium(IV) Type de document : texte imprimé Auteurs : Pradipta Kumar, Auteur ; Rupa S. Madyal, Auteur ; Uttamkumar Joshi, Auteur Année de publication : 2011 Article en page(s) : pp. 8195-8203 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Ligand  Design Résumé : A penta-aza ligand was designed using the Density Functional Theory (DFT), synthesized, and then loaded on a polystyrene matrix to prepare a functional polymer as a Co(II) selective adsorbent. A comparative experimental study on adsorption of Co(II) and Zr(IV) revealed that the polymer-supported ligand is more selective toward Co(II) than Zr(IV) from aqueous acidic solutions. The maximum adsorption capacities of the adsorbent for Co(II) and Zr(IV) were 4.1 and 0.5 mg/g, respectively, at pH 1.0. Vibrational frequencies of the metal-ligand complexes were calculated with the VWN-BP functional to confirm true local minima. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332144 [article] Design and synthesis of polymer-bound penta-aza ligand for selective adsorptive separation of cobalt(II) from zirconium(IV) [texte imprimé] / Pradipta Kumar, Auteur ; Rupa S. Madyal, Auteur ; Uttamkumar Joshi, Auteur . - 2011 . - pp. 8195-8203. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8195-8203 Mots-clés : Ligand  Design Résumé : A penta-aza ligand was designed using the Density Functional Theory (DFT), synthesized, and then loaded on a polystyrene matrix to prepare a functional polymer as a Co(II) selective adsorbent. A comparative experimental study on adsorption of Co(II) and Zr(IV) revealed that the polymer-supported ligand is more selective toward Co(II) than Zr(IV) from aqueous acidic solutions. The maximum adsorption capacities of the adsorbent for Co(II) and Zr(IV) were 4.1 and 0.5 mg/g, respectively, at pH 1.0. Vibrational frequencies of the metal-ligand complexes were calculated with the VWN-BP functional to confirm true local minima. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332144

Low molecular weight organogels and their application in the synthesis of CdS nanoparticles / Pradipta Kumar in Industrial & engineering chemistry research, Vol. 51 N° 47 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15374-15385 Titre : Low molecular weight organogels and their application in the synthesis of CdS nanoparticles Type de document : texte imprimé Auteurs : Pradipta Kumar, Auteur ; Mahesh M. Kadam, Auteur ; Vilas G. Gaikar, Auteur Année de publication : 2013 Article en page(s) : pp. 15374-15385 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Nanoparticle Résumé : Two new fatty acid based derivatives containing carboxylate and amide functions with different alkyl chain lengths were synthesized, and their properties as low molecular weight (LMW) gelators for organic solvents such as nitrobenzene, chlorobenzene, dichlorobenzene, and dioxane are evaluated. The xerogels under Scanning Electron Microscope (SEM) show self-assembled fibrillar and flowerlike structures. Rheological properties of the gelator forming an extended fibrillar network were studied to verify the solidlike behavior of the gel. The role of intermolecular hydrogen bonding in the formation of the supramolecular structures was confirmed through FTIR spectroscopy. The nitrobenzene based organogel superstructure was used as a template for synthesis of CdS nanoparticles. The nanoparticles were characterized through UV-vis spectroscopy and Transmission Electron Microscopy (TEM). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679658 [article] Low molecular weight organogels and their application in the synthesis of CdS nanoparticles [texte imprimé] / Pradipta Kumar, Auteur ; Mahesh M. Kadam, Auteur ; Vilas G. Gaikar, Auteur . - 2013 . - pp. 15374-15385. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15374-15385 Mots-clés : Nanoparticle Résumé : Two new fatty acid based derivatives containing carboxylate and amide functions with different alkyl chain lengths were synthesized, and their properties as low molecular weight (LMW) gelators for organic solvents such as nitrobenzene, chlorobenzene, dichlorobenzene, and dioxane are evaluated. The xerogels under Scanning Electron Microscope (SEM) show self-assembled fibrillar and flowerlike structures. Rheological properties of the gelator forming an extended fibrillar network were studied to verify the solidlike behavior of the gel. The role of intermolecular hydrogen bonding in the formation of the supramolecular structures was confirmed through FTIR spectroscopy. The nitrobenzene based organogel superstructure was used as a template for synthesis of CdS nanoparticles. The nanoparticles were characterized through UV-vis spectroscopy and Transmission Electron Microscopy (TEM). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679658

Selective removal of silver impurity from oxaliplatin by sorption on functionalized polymer / Pradipta Kumar in Industrial & engineering chemistry research, Vol. 51 N° 43 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 14209-14217 Titre : Selective removal of silver impurity from oxaliplatin by sorption on functionalized polymer Type de document : texte imprimé Auteurs : Pradipta Kumar, Auteur ; Khursheed B. Ansari, Auteur ; Vilas G. Gaikar, Auteur Année de publication : 2013 Article en page(s) : pp. 14209-14217 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Sorption  Impurity Résumé : This report relates to synthesis of functionalized polymeric adsorbents for selective removal of silver ion in the presence of platinum(II) from crude oxaliplatin, thus providing an effective method for its purification with a desired impurity profile for silver. Two chelating ligands, thiourea and thiosemicarbazide, were grafted on styrene backbone cross-linked with 2% divinyl benzene (DVB) and tested by batch adsorption studies for the uptake of silver and platinum. The maximum sorption capacity values for both the adsorbents for Ag+ were 101.58 and 67.75 (mg/g), respectively, with an exceptionally high value of separation factor (α = 1155 and 231) over platinum. The experimental sorption data were fitted well with the Langmuir model. Desorption of silver from the polymer can be achieved by using 0.3 M Na2S solution for regeneration. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26593348 [article] Selective removal of silver impurity from oxaliplatin by sorption on functionalized polymer [texte imprimé] / Pradipta Kumar, Auteur ; Khursheed B. Ansari, Auteur ; Vilas G. Gaikar, Auteur . - 2013 . - pp. 14209-14217. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 14209-14217 Mots-clés : Sorption  Impurity Résumé : This report relates to synthesis of functionalized polymeric adsorbents for selective removal of silver ion in the presence of platinum(II) from crude oxaliplatin, thus providing an effective method for its purification with a desired impurity profile for silver. Two chelating ligands, thiourea and thiosemicarbazide, were grafted on styrene backbone cross-linked with 2% divinyl benzene (DVB) and tested by batch adsorption studies for the uptake of silver and platinum. The maximum sorption capacity values for both the adsorbents for Ag+ were 101.58 and 67.75 (mg/g), respectively, with an exceptionally high value of separation factor (α = 1155 and 231) over platinum. The experimental sorption data were fitted well with the Langmuir model. Desorption of silver from the polymer can be achieved by using 0.3 M Na2S solution for regeneration. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26593348