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Synthesis and characterization of iron (III) - coordinated amine - modified poly (glycidylmethacrylate) - grafted densified cellulose and its applicability in defluoridation from industry effluents / Thayyath S. Anirudhan in Industrial & engineering chemistry research, Vol. 49 N° 23 (Décembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp. 12254–12262 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 [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

Thorium (IV) removal and recovery from aqueous solutions using tannin - modified poly (glycidylmethacrylate) - grafted zirconium oxide densified cellulose / Thayyath S. Anirudhan in Industrial & engineering chemistry research, Vol. 50 N° 23 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13288-13298 Titre : Thorium (IV) removal and recovery from aqueous solutions using tannin - modified poly (glycidylmethacrylate) - grafted zirconium oxide densified cellulose Type de document : texte imprimé Auteurs : Thayyath S. Anirudhan, Auteur ; Sylaja R. Rejeena, Auteur Année de publication : 2012 Article en page(s) : pp. 13288-13298 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Aqueous  solution Résumé : A novel adsorbent, tannin-modified poly(glycidylmethacrylate)-grafted zirconium oxide-densified cellulose (TMPGZDC) was synthesized by graft copolymerization reaction of glycidylmethacrylate onto zirconium oxide densified cellulose (ZDC) in the presence of N,N'-methylenebuacrylamide as cross-linker followed by tannin immobilization, and well characterized. The adsorption efficiency of TMPGZDC toward thorium(IV) from aqueous solutions was studied at different optimized conditions. The optimum pH for maximum adsorption was found to be 5.5 with the adsorption percentage of99.2% for an initial concentration of 10 mg/L Equilibrium was achieved within 2 h. The kinetic data were found to follow pseudo-second-order model, which assumes the presence of chemisorption. The temperature dependence indicates an exothermic process. The well agreement of equilibrium data with Langmuir isotherm and Redlich-Peterson isotherm models confirms the monolayer coverage of Th(IV) onto TMPGZDC surface and the maximum adsorption capacity was found to be 96.7 mg/g. Complete removal of Th(IV) from simulated seawater was possible with an adsorbent dosage of 3.0 g/L. Spent adsorbent was effectively degenerated with 0.1 M HNO3. The present investigation shows that TMPGZDC is a promising adsorbent for the removal and recovery of Th(IV) from aqueous solutions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25267485 [article] Thorium (IV) removal and recovery from aqueous solutions using tannin - modified poly (glycidylmethacrylate) - grafted zirconium oxide densified cellulose [texte imprimé] / Thayyath S. Anirudhan, Auteur ; Sylaja R. Rejeena, Auteur . - 2012 . - pp. 13288-13298. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13288-13298 Mots-clés : Aqueous  solution Résumé : A novel adsorbent, tannin-modified poly(glycidylmethacrylate)-grafted zirconium oxide-densified cellulose (TMPGZDC) was synthesized by graft copolymerization reaction of glycidylmethacrylate onto zirconium oxide densified cellulose (ZDC) in the presence of N,N'-methylenebuacrylamide as cross-linker followed by tannin immobilization, and well characterized. The adsorption efficiency of TMPGZDC toward thorium(IV) from aqueous solutions was studied at different optimized conditions. The optimum pH for maximum adsorption was found to be 5.5 with the adsorption percentage of99.2% for an initial concentration of 10 mg/L Equilibrium was achieved within 2 h. The kinetic data were found to follow pseudo-second-order model, which assumes the presence of chemisorption. The temperature dependence indicates an exothermic process. The well agreement of equilibrium data with Langmuir isotherm and Redlich-Peterson isotherm models confirms the monolayer coverage of Th(IV) onto TMPGZDC surface and the maximum adsorption capacity was found to be 96.7 mg/g. Complete removal of Th(IV) from simulated seawater was possible with an adsorbent dosage of 3.0 g/L. Spent adsorbent was effectively degenerated with 0.1 M HNO3. The present investigation shows that TMPGZDC is a promising adsorbent for the removal and recovery of Th(IV) from aqueous solutions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25267485