| Titre : | Nanostructure Iron(III)-zirconium(IV) binary mixed oxide : synthesis, characterization, and physicochemical aspects of arsenic(III) sorption from the aqueous solution (2009) |
| Auteurs : | Kaushik Gupta, Auteur ; Krishna Biswas, Auteur ; Uday Chand Ghosh, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 47 n°24, Décembre 2008) |
| Article en page(s) : | p. 9903–9912 |
| Note générale : | Industrial chemistry |
| Langues : | Anglais |
| Tags : | 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 |
