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Nanostructure Iron(III)-zirconium(IV) binary mixed oxide / Kaushik Gupta ; Krishna Biswas ; Uday Chand Ghosh in Industrial & engineering chemistry research, Vol. 47 n°24 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°24 (Décembre 2008) . - p. 9903–9912 Titre : Nanostructure Iron(III)-zirconium(IV) binary mixed oxide : synthesis, characterization, and physicochemical aspects of arsenic(III) sorption from the aqueous solution Type de document : texte imprimé Auteurs : Kaushik Gupta, Auteur ; Krishna Biswas, Auteur ; Uday Chand Ghosh, Auteur Année de publication : 2009 Article en page(s) : p. 9903–9912 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Iron(III)  zirconium(IV)  mixed  oxide  (NHIZO)  X-ray  diffraction  (XRD)  scanning  electron  microscopy  (SEM) Résumé : Characterization of synthetic Fe(III)−Zr(IV) mixed oxide (NHIZO) by the X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) analyses confirmed the material as agglomerated nanocrystallite particles (16−21 nm) which was used for As(III) sorption from water. The optimum pH and equilibrium time (As(III) concentrations (mgL−1), 5.0 and 10.0; NHIZO dose, 2 g·L−1; temperature, 303 K) were 7.0 ± 0.2 and 2.0 h, respectively. The kinetic and equilibrium data described, respectively, the pseudo-second-order equation and the Langmuir as well as the Redlich−Peterson isotherm models very well. The Langmuir capacity was 65.5 ± 1.0 mg·g−1 at 303 K, which increased with increasing temperature. The positive enthalpy (ΔH°) and negative free energy (ΔG°) changes indicated the endothermic and spontaneous nature of the reaction, respectively. The sorption energy (4.64−5.20 kJ·mol−1) and Fourier transform infrared (FTIR) analyses suggested physissorption of As(III) by NHIZO. The sorbed arsenic could be desorbed (∼80%) by 2.0 M alkali. The toxicity leaching characteristic procedure test marked As(III)−NHIZO as nonhazardous waste. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8002107 [article] Nanostructure Iron(III)-zirconium(IV) binary mixed oxide : synthesis, characterization, and physicochemical aspects of arsenic(III) sorption from the aqueous solution [texte imprimé] / Kaushik Gupta, Auteur ; Krishna Biswas, Auteur ; Uday Chand Ghosh, Auteur . - 2009 . - p. 9903–9912. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°24 (Décembre 2008) . - p. 9903–9912 Mots-clés : Iron(III)  zirconium(IV)  mixed  oxide  (NHIZO)  X-ray  diffraction  (XRD)  scanning  electron  microscopy  (SEM) Résumé : Characterization of synthetic Fe(III)−Zr(IV) mixed oxide (NHIZO) by the X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) analyses confirmed the material as agglomerated nanocrystallite particles (16−21 nm) which was used for As(III) sorption from water. The optimum pH and equilibrium time (As(III) concentrations (mgL−1), 5.0 and 10.0; NHIZO dose, 2 g·L−1; temperature, 303 K) were 7.0 ± 0.2 and 2.0 h, respectively. The kinetic and equilibrium data described, respectively, the pseudo-second-order equation and the Langmuir as well as the Redlich−Peterson isotherm models very well. The Langmuir capacity was 65.5 ± 1.0 mg·g−1 at 303 K, which increased with increasing temperature. The positive enthalpy (ΔH°) and negative free energy (ΔG°) changes indicated the endothermic and spontaneous nature of the reaction, respectively. The sorption energy (4.64−5.20 kJ·mol−1) and Fourier transform infrared (FTIR) analyses suggested physissorption of As(III) by NHIZO. The sorbed arsenic could be desorbed (∼80%) by 2.0 M alkali. The toxicity leaching characteristic procedure test marked As(III)−NHIZO as nonhazardous waste. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8002107