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Chelating resins silica gel supported aminophosphonic acids prepared by a heterogeneous synthesis method and a homogeneous synthesis method and the removal properties for Hg(II) from aqueous solutions / Zengdi Wang in Industrial & engineering chemistry research, Vol. 51 N° 25 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 25 (Juin 2012) . - pp. 8598-8607 Titre : Chelating resins silica gel supported aminophosphonic acids prepared by a heterogeneous synthesis method and a homogeneous synthesis method and the removal properties for Hg(II) from aqueous solutions Type de document : texte imprimé Auteurs : Zengdi Wang, Auteur ; Ping Yin, Auteur ; Zhi Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 8598-8607 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Aqueous  solution  Silica  gel Résumé : Two kinds of composites silica gel supported by aminophosphonic acids SG-T-P-1 and SG-T-P-2 were prepared successfully by functionalization of silica gel via a heterogeneous synthesis method and a homogeneous synthesis method, respectively, and they were characterized by infrared spectra (IR), scanning electron microscope (SEM), and energy dispersive X-ray analysis system spectrum (EDXAS). Moreover, the static adsorption capabilities of these two chelating resins toward transition-metal ions were studied. Our objective was to choose the adsorbent with high adsorption capacities via different synthesis methods, and the results showed that SG-T-P prepared via a homogeneous synthesis method had excellent adsorption capacities and high adsorption selectivity for Hg(II) ions. The Langmuir model was better than the Freundlich model to fit the adsorption isotherms of SG-T-P for Hg(II), and the maximum adsorption capacity was 303.03 mg/g at 15 °C. Thus, the novel chelating resin silica gel supported by aminophosphonic acids SG-T-P prepared by a homogeneous synthesis method is favorable and useful for the removal of Hg(II) ions from aqueous solutions. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26066786 [article] Chelating resins silica gel supported aminophosphonic acids prepared by a heterogeneous synthesis method and a homogeneous synthesis method and the removal properties for Hg(II) from aqueous solutions [texte imprimé] / Zengdi Wang, Auteur ; Ping Yin, Auteur ; Zhi Wang, Auteur . - 2012 . - pp. 8598-8607. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 25 (Juin 2012) . - pp. 8598-8607 Mots-clés : Aqueous  solution  Silica  gel Résumé : Two kinds of composites silica gel supported by aminophosphonic acids SG-T-P-1 and SG-T-P-2 were prepared successfully by functionalization of silica gel via a heterogeneous synthesis method and a homogeneous synthesis method, respectively, and they were characterized by infrared spectra (IR), scanning electron microscope (SEM), and energy dispersive X-ray analysis system spectrum (EDXAS). Moreover, the static adsorption capabilities of these two chelating resins toward transition-metal ions were studied. Our objective was to choose the adsorbent with high adsorption capacities via different synthesis methods, and the results showed that SG-T-P prepared via a homogeneous synthesis method had excellent adsorption capacities and high adsorption selectivity for Hg(II) ions. The Langmuir model was better than the Freundlich model to fit the adsorption isotherms of SG-T-P for Hg(II), and the maximum adsorption capacity was 303.03 mg/g at 15 °C. Thus, the novel chelating resin silica gel supported by aminophosphonic acids SG-T-P prepared by a homogeneous synthesis method is favorable and useful for the removal of Hg(II) ions from aqueous solutions. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26066786

Production of biodiesel by esterification of stearic acid over aminophosphonic acid resin D418 / Chen, Wen in Industrial & engineering chemistry research, Vol. 51 N° 15 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 15 (Avril 2012) . - pp. 5402–5407 Titre : Production of biodiesel by esterification of stearic acid over aminophosphonic acid resin D418 Type de document : texte imprimé Auteurs : Chen, Wen, Auteur ; Ping Yin, Auteur ; Hou Chen, Auteur Année de publication : 2012 Article en page(s) : pp. 5402–5407 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Biodiesel  Esterification Résumé : Biodiesel production has become a very intense research field because of its environmental benefits and the growing interest in finding new resources and alternatives for conventional fuels. In the present work, biodiesel production from the esterification of the free fatty acid stearic acid with ethanol over aminophosphonic acid resin D418 was studied. The effects of experimental factors such as the amount of D418, reaction temperature, and molar ratio of ethanol to stearic acid on the conversion ratio were evaluated. Process optimization using response surface methodology (RSM) was performed, and the interactions between the operating variables were elucidated. The optimum values for maximum esterification percentage were obtained by using a Box–Behnken center-united design with a minimum of experimental work. Moreover, the kinetics of the esterification catalyzed by D418 was studied, and the pseudohomogeneous (PH) model was used to simulate the experimental data. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202786w [article] Production of biodiesel by esterification of stearic acid over aminophosphonic acid resin D418 [texte imprimé] / Chen, Wen, Auteur ; Ping Yin, Auteur ; Hou Chen, Auteur . - 2012 . - pp. 5402–5407. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 15 (Avril 2012) . - pp. 5402–5407 Mots-clés : Biodiesel  Esterification Résumé : Biodiesel production has become a very intense research field because of its environmental benefits and the growing interest in finding new resources and alternatives for conventional fuels. In the present work, biodiesel production from the esterification of the free fatty acid stearic acid with ethanol over aminophosphonic acid resin D418 was studied. The effects of experimental factors such as the amount of D418, reaction temperature, and molar ratio of ethanol to stearic acid on the conversion ratio were evaluated. Process optimization using response surface methodology (RSM) was performed, and the interactions between the operating variables were elucidated. The optimum values for maximum esterification percentage were obtained by using a Box–Behnken center-united design with a minimum of experimental work. Moreover, the kinetics of the esterification catalyzed by D418 was studied, and the pseudohomogeneous (PH) model was used to simulate the experimental data. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202786w