Nos Abonnements
Ressources Électroniques
Détail de l'auteur
Auteur Padmajan S. Suchithra |
Documents disponibles écrits par cet auteur (3)
Ajouter le résultat dans votre panier Faire une suggestion Affiner la rechercheHeavy 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)
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 ; Padmajan 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 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 146-156[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 ; Padmajan 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 [...] Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
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 ; Padmajan 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
in Industrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 4825–4836[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 ; Padmajan 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 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Synthesis and characterization of iron (III) - coordinated amine - modified poly (glycidylmethacrylate) - grafted densified cellulose and its applicability in defluoridation from industry effluents Type de document : texte imprimé Auteurs : Thayyath S. Anirudhan, Auteur ; Padmajan S. Suchithra, Auteur Année de publication : 2011 Article en page(s) : pp. 12254–12262 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Iron Poly Industry effluents Résumé : In this study, the development and characterization of a novel adsorbent, iron(III)-coordinated amine-modified poly(glycidylmethacrylate)-grafted densified cellulose (AM-Fe-PGDC), for the removal and recovery of fluoride ions from aqueous solutions is reported. The adsorbent was characterized by FTIR, X-ray diffraction, SEM, TG/DTG, surface area analyzer, and potentiometric titration. The effect of process parameters such as agitation time, concentration, pH, ionic strength, adsorbent dose, and temperature on the extent of fluoride adsorption was investigated. The adsorbent exhibits very high adsorption potential (>99.9%) at an optimum equilibrium pH 7.0. The nonlinear form of a pseudo second-order kinetic model and Langmuir isotherm model adequately described the experimental kinetic and equilibrium data. The thermodynamic parameters showed that the adsorption of fluoride onto AM-Fe-PGDC was feasible, spontaneous, and exothermic. Adsorption experiments were also conducted using a commercial anion exchanger, Duolite-A7, for comparison. Utility of the adsorbent was tested with a simulated industry wastewater sample. Adsorbed fluoride ions were desorbed effectively by 0.1 M HCl. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100809f
in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp. 12254–12262[article] Synthesis and characterization of iron (III) - coordinated amine - modified poly (glycidylmethacrylate) - grafted densified cellulose and its applicability in defluoridation from industry effluents [texte imprimé] / Thayyath S. Anirudhan, Auteur ; Padmajan S. Suchithra, Auteur . - 2011 . - pp. 12254–12262.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp. 12254–12262
Mots-clés : Iron Poly Industry effluents Résumé : In this study, the development and characterization of a novel adsorbent, iron(III)-coordinated amine-modified poly(glycidylmethacrylate)-grafted densified cellulose (AM-Fe-PGDC), for the removal and recovery of fluoride ions from aqueous solutions is reported. The adsorbent was characterized by FTIR, X-ray diffraction, SEM, TG/DTG, surface area analyzer, and potentiometric titration. The effect of process parameters such as agitation time, concentration, pH, ionic strength, adsorbent dose, and temperature on the extent of fluoride adsorption was investigated. The adsorbent exhibits very high adsorption potential (>99.9%) at an optimum equilibrium pH 7.0. The nonlinear form of a pseudo second-order kinetic model and Langmuir isotherm model adequately described the experimental kinetic and equilibrium data. The thermodynamic parameters showed that the adsorption of fluoride onto AM-Fe-PGDC was feasible, spontaneous, and exothermic. Adsorption experiments were also conducted using a commercial anion exchanger, Duolite-A7, for comparison. Utility of the adsorbent was tested with a simulated industry wastewater sample. Adsorbed fluoride ions were desorbed effectively by 0.1 M HCl. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100809f Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
