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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

Removal of Ni(II) and Cr(VI) with titanium(IV) oxide nanoparticle agglomerates in fixed-bed columns / Sushanta Debnath in Industrial & engineering chemistry research, Vol. 49 N° 5 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2031–2039 Titre : Removal of Ni(II) and Cr(VI) with titanium(IV) oxide nanoparticle agglomerates in fixed-bed columns Type de document : texte imprimé Auteurs : Sushanta Debnath, Auteur ; Krishna Biswas, Auteur ; Uday Chand Ghosh, Auteur Année de publication : 2010 Article en page(s) : pp. 2031–2039 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Ni(II);  Cr(VI);  Titanium(IV);  Oxide  Nanoparticle Résumé : Removal performances of Ni(II) and Cr(VI) from water were investigated using a packed fixed bed of agglomerated nanoparticles of hydrous titanium(IV) oxide (NHTO). The parameters varied were the (i) bed depth, (ii) flow rate, and (iii) feed solution concentrations. Comparison of breakthrough volumes indicated that the removal performance of Ni(II) (at pH 5.0 ± 0.1) was better than that of Cr(VI) (at pH 2.0 ± 0.1) by the NHTO fixed-bed columns. The breakthrough data were described better by the Thomas (R2 = 0.983−0.999) and bed-depth service time (BDST) (R2 = 0.992−0.998) models than by the Adams−Bohart model (R2 = 0.844−0.982). The Thomas model column capacity (q0) for Ni(II) was greater than that for Cr(VI) at any conditions. The breakthrough time (tb) of the BDST model increased with increasing bed depth of the NHTO columns, and the increase in tb was greater than the increase in bed depth. NHTO fixed-bed columns were able to treat Ni(II)- and Cr(VI)-contaminated industrial wastewater successfully. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9014827 [article] Removal of Ni(II) and Cr(VI) with titanium(IV) oxide nanoparticle agglomerates in fixed-bed columns [texte imprimé] / Sushanta Debnath, Auteur ; Krishna Biswas, Auteur ; Uday Chand Ghosh, Auteur . - 2010 . - pp. 2031–2039. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2031–2039 Mots-clés : Ni(II);  Cr(VI);  Titanium(IV);  Oxide  Nanoparticle Résumé : Removal performances of Ni(II) and Cr(VI) from water were investigated using a packed fixed bed of agglomerated nanoparticles of hydrous titanium(IV) oxide (NHTO). The parameters varied were the (i) bed depth, (ii) flow rate, and (iii) feed solution concentrations. Comparison of breakthrough volumes indicated that the removal performance of Ni(II) (at pH 5.0 ± 0.1) was better than that of Cr(VI) (at pH 2.0 ± 0.1) by the NHTO fixed-bed columns. The breakthrough data were described better by the Thomas (R2 = 0.983−0.999) and bed-depth service time (BDST) (R2 = 0.992−0.998) models than by the Adams−Bohart model (R2 = 0.844−0.982). The Thomas model column capacity (q0) for Ni(II) was greater than that for Cr(VI) at any conditions. The breakthrough time (tb) of the BDST model increased with increasing bed depth of the NHTO columns, and the increase in tb was greater than the increase in bed depth. NHTO fixed-bed columns were able to treat Ni(II)- and Cr(VI)-contaminated industrial wastewater successfully. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9014827