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Preparation of negatively charged hybrid adsorbents and their applications for Pb2+ removal / Junsheng Liu in Industrial & engineering chemistry research, Vol. 50 N° 14 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8645-8657 Titre : Preparation of negatively charged hybrid adsorbents and their applications for Pb2+ removal Type de document : texte imprimé Auteurs : Junsheng Liu, Auteur ; Jingyu Si, Auteur ; Quan Zhang, Auteur Année de publication : 2011 Article en page(s) : pp. 8645-8657 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Preparation  Hybrid  adsorbents Résumé : A novel approach to the negatively charged hybrid adsorbents was proposed. These hybrid adsorbents were prepared via the ring opening of pyromellitic acid dianhydride (PMDA) and N-[3-(trimethoxysilyl)propyl]ethylenediamine and a subsequent sol-gel process. Fourier transform infrared spectra confirmed the step products. Their adsorption kinetics, isotherm, and thermodynamic parameters ΔG, ΔH, and ΔS for Pb2+ removal from aqueous solution were examined. Differential scanning calorimetry and thermogravimetric analysis thermal amylases showed that these samples had high thermal stability and the crystallization temperature increased with an increase in the PMDA content because of cross-linking between organic and inorganic moieties and the further formation of a hybrid matrix. Adsorption experiments indicated that Pb2+ adsorption on these hybrid adsorbents followed the Lagergren second-order kinetic and Langmuir isotherm models. The negative values of ΔG and the positive values of ΔH showed that Pb + adsorption on these hybrid adsorbents was spontaneous and an endothermic process in nature. Scanning electron microscopy and energy-dispersive spectrometry images further confirmed Pb2+ ions on the surfaces of samples A-D. Moreover, a desorption experiment indicated that they can be regenerated. These findings suggest that the prepared hybrid adsorbents are promising in the separation and recovery of Pb2+ ions from contaminated water. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346903 [article] Preparation of negatively charged hybrid adsorbents and their applications for Pb2+ removal [texte imprimé] / Junsheng Liu, Auteur ; Jingyu Si, Auteur ; Quan Zhang, Auteur . - 2011 . - pp. 8645-8657. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8645-8657 Mots-clés : Preparation  Hybrid  adsorbents Résumé : A novel approach to the negatively charged hybrid adsorbents was proposed. These hybrid adsorbents were prepared via the ring opening of pyromellitic acid dianhydride (PMDA) and N-[3-(trimethoxysilyl)propyl]ethylenediamine and a subsequent sol-gel process. Fourier transform infrared spectra confirmed the step products. Their adsorption kinetics, isotherm, and thermodynamic parameters ΔG, ΔH, and ΔS for Pb2+ removal from aqueous solution were examined. Differential scanning calorimetry and thermogravimetric analysis thermal amylases showed that these samples had high thermal stability and the crystallization temperature increased with an increase in the PMDA content because of cross-linking between organic and inorganic moieties and the further formation of a hybrid matrix. Adsorption experiments indicated that Pb2+ adsorption on these hybrid adsorbents followed the Lagergren second-order kinetic and Langmuir isotherm models. The negative values of ΔG and the positive values of ΔH showed that Pb + adsorption on these hybrid adsorbents was spontaneous and an endothermic process in nature. Scanning electron microscopy and energy-dispersive spectrometry images further confirmed Pb2+ ions on the surfaces of samples A-D. Moreover, a desorption experiment indicated that they can be regenerated. These findings suggest that the prepared hybrid adsorbents are promising in the separation and recovery of Pb2+ ions from contaminated water. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346903