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Efficiency of amine-modified poly(glycidyl methacrylate)-grafted cellulose in the removal and recovery of vanadium(V) from aqueous solutions / T. S. Anirudhan in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2118–2124 Titre : Efficiency of amine-modified poly(glycidyl methacrylate)-grafted cellulose in the removal and recovery of vanadium(V) from aqueous solutions Type de document : texte imprimé Auteurs : T. S. Anirudhan, Auteur ; S. Jalajamony, Auteur ; L. Divya, Auteur Année de publication : 2009 Article en page(s) : p. 2118–2124 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Cellulose  anion  exchanger  Glycidyl  methacrylate  Hydrochloric  acid  treatment Résumé : A cellulose-based anion exchanger (Cell-AE) bearing the —N+HR2Cl− functional group was prepared through graft copolymerization of glycidyl methacrylate onto cellulose (Cell) in the presence of N,N′-methylenebisacrylamide as a cross-linker using benzoyl peroxide as the initiator, followed by amination and hydrochloric acid treatment. The adsorbent was characterized by infrared spectroscopy, scanning electron microscopy, surface area analysis, thermogravimetry, and potentiometric titrations. Batch experiments were performed to evaluate the adsorption efficiency of Cell-AE toward V(V) ions in aqueous solutions. The maximum removal was observed in the pH range of 4.0−6.0. The adsorption process achieved more than 99.6% V(V) removal from an initial concentration of 25.0 mg/L. Adsorption kinetic data were described by pseudo-second-order equation. The equilibrium data fitted very well with the Langmuir model, and the maximum adsorption capacity of Cell-AE toward V(V) was found to be 197.75 mg/g at 30 °C. Over 96.0% desorption of V(V) was achieved with 0.1 M NaOH solution. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8000869 [article] Efficiency of amine-modified poly(glycidyl methacrylate)-grafted cellulose in the removal and recovery of vanadium(V) from aqueous solutions [texte imprimé] / T. S. Anirudhan, Auteur ; S. Jalajamony, Auteur ; L. Divya, Auteur . - 2009 . - p. 2118–2124. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2118–2124 Mots-clés : Cellulose  anion  exchanger  Glycidyl  methacrylate  Hydrochloric  acid  treatment Résumé : A cellulose-based anion exchanger (Cell-AE) bearing the —N+HR2Cl− functional group was prepared through graft copolymerization of glycidyl methacrylate onto cellulose (Cell) in the presence of N,N′-methylenebisacrylamide as a cross-linker using benzoyl peroxide as the initiator, followed by amination and hydrochloric acid treatment. The adsorbent was characterized by infrared spectroscopy, scanning electron microscopy, surface area analysis, thermogravimetry, and potentiometric titrations. Batch experiments were performed to evaluate the adsorption efficiency of Cell-AE toward V(V) ions in aqueous solutions. The maximum removal was observed in the pH range of 4.0−6.0. The adsorption process achieved more than 99.6% V(V) removal from an initial concentration of 25.0 mg/L. Adsorption kinetic data were described by pseudo-second-order equation. The equilibrium data fitted very well with the Langmuir model, and the maximum adsorption capacity of Cell-AE toward V(V) was found to be 197.75 mg/g at 30 °C. Over 96.0% desorption of V(V) was achieved with 0.1 M NaOH solution. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8000869

Evaluation of iron (III) chelated polymer grafted lignocellulosics for arsenic (V) adsorption in a batch reactor system / S. Rijith in Industrial & engineering chemistry research, Vol. 51 N° 32 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 32 (Août 2012) . - pp. 10682-10694 Titre : Evaluation of iron (III) chelated polymer grafted lignocellulosics for arsenic (V) adsorption in a batch reactor system Type de document : texte imprimé Auteurs : S. Rijith, Auteur ; T. S. Anirudhan, Auteur ; T. Shripathi, Auteur Année de publication : 2012 Article en page(s) : pp. 10682-10694 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Reactor  Batchwise  Adsorption Résumé : A novel adsorbent, iron(III) chelate of an amino-functionalized polyacrylamide-grafted coconut coir pith (Fe(III)-A-PGCP) was prepared and used for the removal of arsenic(V) from aqueous solutions. The adsorbent was prepared by graft copolymerization of acrylamide onto coconut coir pith, CP (a lignocellulosic residue) in the presence of N,N'-methylenebisacrylamide as a cross-linking agent followed by treatment with ethylenediamine and ferric chloride in acid (HCl) medium. The adsorbent was characterized using Fourier transform infrared (FTIR) spectroscopy, Raman analysis, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy coupled with energy-dispersive spectroscopy (SEM/EDS), surface area analysis, determination of amine and iron moieties on the surface of the adsorbent, and batch adsorption experiments were carried out under a variety of operating conditions such as contact time, initial sorbate concentration, pH, adsorbent dose, presence of interfering ions, and temperature. The results showed a maximum adsorption (>99.9%) at pH 7.0. Kinetic data were modeled using pseudo-first-order, pseudo-second-order, and Ritchie-modified second-order models. The kinetic data were best described by a pseudo-second-order equation. Adsorption equilibrium data were correlated with Langmuir, Freundlich, and Sips isotherms. The results showed that the Langmuir isotherm model seemed to successfully simulate the adsorption isotherm curve and the maximum adsorption capacity was estimated to be 107.8 mg/g at 30 °C. The reusability of the spent adsorbent for several cycles was demonstrated using 0.1 M HCl. The residual arsenic concentration was brought down from 1.0 mg/L to 0.01 mg/L (more than 99.0%) was achieved with a Fe(III)-A-PGCP dose of 150 mg in a 50-mL sample. A counter-current batch adsorber was designed using operating lines. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26259772 [article] Evaluation of iron (III) chelated polymer grafted lignocellulosics for arsenic (V) adsorption in a batch reactor system [texte imprimé] / S. Rijith, Auteur ; T. S. Anirudhan, Auteur ; T. Shripathi, Auteur . - 2012 . - pp. 10682-10694. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 32 (Août 2012) . - pp. 10682-10694 Mots-clés : Reactor  Batchwise  Adsorption Résumé : A novel adsorbent, iron(III) chelate of an amino-functionalized polyacrylamide-grafted coconut coir pith (Fe(III)-A-PGCP) was prepared and used for the removal of arsenic(V) from aqueous solutions. The adsorbent was prepared by graft copolymerization of acrylamide onto coconut coir pith, CP (a lignocellulosic residue) in the presence of N,N'-methylenebisacrylamide as a cross-linking agent followed by treatment with ethylenediamine and ferric chloride in acid (HCl) medium. The adsorbent was characterized using Fourier transform infrared (FTIR) spectroscopy, Raman analysis, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy coupled with energy-dispersive spectroscopy (SEM/EDS), surface area analysis, determination of amine and iron moieties on the surface of the adsorbent, and batch adsorption experiments were carried out under a variety of operating conditions such as contact time, initial sorbate concentration, pH, adsorbent dose, presence of interfering ions, and temperature. The results showed a maximum adsorption (>99.9%) at pH 7.0. Kinetic data were modeled using pseudo-first-order, pseudo-second-order, and Ritchie-modified second-order models. The kinetic data were best described by a pseudo-second-order equation. Adsorption equilibrium data were correlated with Langmuir, Freundlich, and Sips isotherms. The results showed that the Langmuir isotherm model seemed to successfully simulate the adsorption isotherm curve and the maximum adsorption capacity was estimated to be 107.8 mg/g at 30 °C. The reusability of the spent adsorbent for several cycles was demonstrated using 0.1 M HCl. The residual arsenic concentration was brought down from 1.0 mg/L to 0.01 mg/L (more than 99.0%) was achieved with a Fe(III)-A-PGCP dose of 150 mg in a 50-mL sample. A counter-current batch adsorber was designed using operating lines. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26259772

Heavy metals uptake from aqueous solutions and industrial wastewaters by humic acid-immobilized polymer/bentonite composite / T. S. Anirudhan in Chemical engineering journal, Vol. 156 N° 1 (Janvier 2010) 

Public ISBD [article]  in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 146-156 Titre : Heavy metals uptake from aqueous solutions and industrial wastewaters by humic acid-immobilized polymer/bentonite composite : kinetics and equilibrium modeling Type de document : texte imprimé Auteurs : T. S. Anirudhan, Auteur ; P.S. Suchithra, Auteur Année de publication : 2010 Article en page(s) : pp. 146-156 Note générale : Génie Chimique- Langues : Anglais (eng) Mots-clés : Humic  acid  Polymer/clay  composite  Heavy  metal  ion  Adsorption  Wastewater  Regeneration Index. décimale : 660 Résumé : This study explored the feasibility of utilizing a novel adsorbent, humic acid-immobilized-amine-modified polyacrylamide/bentonite composite (HA-Am-PAA-B) for the adsorption of Cu(II), Zn(II) and Co(II) ions from aqueous solutions. The FTIR and XRD analyses were done to characterize the adsorbent material. The effects of pH, contact time, initial adsorbate concentration, ionic strength and adsorbent dose on adsorption of metal ions were investigated using batch adsorption experiments. The optimum pH for Cu(II), Zn(II) and Co(II) adsorption was observed at 5.0, 9.0 and 8.0, respectively. The mechanism for the removal of metal ions by HA-Am-PAA-B was based on ion exchange and complexation reactions. Metal removal by HA-Am-PAA-B followed a pseudo-second-order kinetics and equilibrium was achieved within 120 min. The suitability of Langmuir, Freundlich and Dubinin-Radushkevich adsorption models to the equilibrium data was investigated. The adsorption was well described by the Langmuir isotherm model. The maximum monolayer adsorption capacity was 106.2, 96.1 and 52.9 mg g−1 for Cu(II), Zn(II) and Co(II) ions, respectively, at 30 °C. The efficiency of HA-Am-PAA-B in removing metal ions from different industry wastewaters was tested. Adsorbed metal ions were desorbed effectively (97.7 for Cu(II), 98.5 for Zn(II) and 99.2% for Co(II)) by 0.1 M HCl. The reusability of the HA-Am-PAA-B for several cycles was also demonstrated. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XFY0NY-7&_user=6 [...] [article] Heavy metals uptake from aqueous solutions and industrial wastewaters by humic acid-immobilized polymer/bentonite composite : kinetics and equilibrium modeling [texte imprimé] / T. S. Anirudhan, Auteur ; P.S. Suchithra, Auteur . - 2010 . - pp. 146-156. Génie Chimique- Langues : Anglais (eng) in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 146-156 Mots-clés : Humic  acid  Polymer/clay  composite  Heavy  metal  ion  Adsorption  Wastewater  Regeneration Index. décimale : 660 Résumé : This study explored the feasibility of utilizing a novel adsorbent, humic acid-immobilized-amine-modified polyacrylamide/bentonite composite (HA-Am-PAA-B) for the adsorption of Cu(II), Zn(II) and Co(II) ions from aqueous solutions. The FTIR and XRD analyses were done to characterize the adsorbent material. The effects of pH, contact time, initial adsorbate concentration, ionic strength and adsorbent dose on adsorption of metal ions were investigated using batch adsorption experiments. The optimum pH for Cu(II), Zn(II) and Co(II) adsorption was observed at 5.0, 9.0 and 8.0, respectively. The mechanism for the removal of metal ions by HA-Am-PAA-B was based on ion exchange and complexation reactions. Metal removal by HA-Am-PAA-B followed a pseudo-second-order kinetics and equilibrium was achieved within 120 min. The suitability of Langmuir, Freundlich and Dubinin-Radushkevich adsorption models to the equilibrium data was investigated. The adsorption was well described by the Langmuir isotherm model. The maximum monolayer adsorption capacity was 106.2, 96.1 and 52.9 mg g−1 for Cu(II), Zn(II) and Co(II) ions, respectively, at 30 °C. The efficiency of HA-Am-PAA-B in removing metal ions from different industry wastewaters was tested. Adsorbed metal ions were desorbed effectively (97.7 for Cu(II), 98.5 for Zn(II) and 99.2% for Co(II)) by 0.1 M HCl. The reusability of the HA-Am-PAA-B for several cycles was also demonstrated. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XFY0NY-7&_user=6 [...]

Kinetic and equilibrium profiles of adsorptive recovery of thorium (IV) from aqueous solutions using poly (methacrylic acid) grafted cellulose / bentonite superabsorbent composite / T. S. Anirudhan in Industrial & engineering chemistry research, Vol. 51 N° 13 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 4825–4836 Titre : Kinetic and equilibrium profiles of adsorptive recovery of thorium (IV) from aqueous solutions using poly (methacrylic acid) grafted cellulose / bentonite superabsorbent composite Type de document : texte imprimé Auteurs : T. S. Anirudhan, Auteur ; P. S. Suchithra, Auteur ; P. Senan, Auteur Année de publication : 2012 Article en page(s) : pp. 4825–4836 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Kinetic  Aqueous  solutions Résumé : The removal and recovery of thorium(IV) [Th(IV)] ions from aqueous solutions were investigated using poly(methacrylic acid)-grafted-cellulose/bentonite (PMAA-g-Cell/Bent) superabsorbent composite through batch adsorption experiments. Surface characterizations of the adsorbent were investigated. The adsorbent showed significant Th(IV) removal (>99.7%) at pH 5.0. The influence of coexisting ions on the adsorption of Th(IV) was studied. Mass transfer aspects of Th(IV) adsorption onto PMAA-g-Cell/Bent were evaluated. The Sips adsorption isotherm described the adsorption data very well, with a maximum adsorption capacity of 188.1 mg/g. Thermodynamic parameters such as standard enthalpy (ΔH°), standard entropy (ΔS°), standard free energy (ΔG°), activation energy (Ea), isosteric enthalpy (ΔHx), and entropy (ΔSx) were calculated. Tests with a seawater sample revealed the effectiveness of PMAA-g-Cell/Bent for adsorptive removal of Th(IV) from aqueous solutions. Desorption experiments showed that 0.1 M HNO3 can effectively desorb adsorbed thorium ions with a contact time of 3 h. A single stage batch reactor is designed for commercial applicability of the adsorbent. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202538q [article] Kinetic and equilibrium profiles of adsorptive recovery of thorium (IV) from aqueous solutions using poly (methacrylic acid) grafted cellulose / bentonite superabsorbent composite [texte imprimé] / T. S. Anirudhan, Auteur ; P. S. Suchithra, Auteur ; P. Senan, Auteur . - 2012 . - pp. 4825–4836. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 4825–4836 Mots-clés : Kinetic  Aqueous  solutions Résumé : The removal and recovery of thorium(IV) [Th(IV)] ions from aqueous solutions were investigated using poly(methacrylic acid)-grafted-cellulose/bentonite (PMAA-g-Cell/Bent) superabsorbent composite through batch adsorption experiments. Surface characterizations of the adsorbent were investigated. The adsorbent showed significant Th(IV) removal (>99.7%) at pH 5.0. The influence of coexisting ions on the adsorption of Th(IV) was studied. Mass transfer aspects of Th(IV) adsorption onto PMAA-g-Cell/Bent were evaluated. The Sips adsorption isotherm described the adsorption data very well, with a maximum adsorption capacity of 188.1 mg/g. Thermodynamic parameters such as standard enthalpy (ΔH°), standard entropy (ΔS°), standard free energy (ΔG°), activation energy (Ea), isosteric enthalpy (ΔHx), and entropy (ΔSx) were calculated. Tests with a seawater sample revealed the effectiveness of PMAA-g-Cell/Bent for adsorptive removal of Th(IV) from aqueous solutions. Desorption experiments showed that 0.1 M HNO3 can effectively desorb adsorbed thorium ions with a contact time of 3 h. A single stage batch reactor is designed for commercial applicability of the adsorbent. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202538q