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Highly active S-modified ZnFe2O4 heterogeneous catalyst and Its photo-fenton behavior under UV–visible irradiation / Liangjun Liu in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7219–7227. Titre : Highly active S-modified ZnFe2O4 heterogeneous catalyst and Its photo-fenton behavior under UV–visible irradiation Type de document : texte imprimé Auteurs : Liangjun Liu, Auteur ; Guoliang Zhang, Auteur ; Ling Wang, Auteur Année de publication : 2011 Article en page(s) : pp. 7219–7227. Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Heterogeneous  Catalyst Résumé : Ultrafine Zn–Fe composite oxides have been synthesized by the sol–gel method and then modified by S═O. After preparation, these chalybeate compounds were characterized by BET surface area and porosity analyzer, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectrometry (FT-IR). The influence of introduced S═O on the performance of ZnFe2O4 catalysts was measured, and the reaction mechanism was investigated. To evaluate the activities of different catalysts, a series of photo-Fenton reactions have been conducted to decontaminate the Reactive Black KN-GR simulated wastewater. Results indicated that the prepared catalysts were porous-material with a high specific surface area of 38 m2 g–1. Significantly, the FT-IR spectrum suggested that sulfated ZnFe2O4 calcinated at 773 K (named S773 catalyst) exhibited a strong acid property and XPS analysis proved the presence of S6+(S═O), which led to the generation of acid sites. Under optimum conditions of 9.8 mM H2O2, 0.5 g L–1 catalyst, and pH = 6.0, up to 90% total organic carbon removal and 100% decolorization of a solution containing 100 mg L–1 Reactive Black KN-GR could be achieved after 150 min of treatment. The kinetics of acid catalysis were also discussed, and the stability of the catalyst was estimated on studying the iron leaching and S773 catalyst recycling. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2005516 [article] Highly active S-modified ZnFe2O4 heterogeneous catalyst and Its photo-fenton behavior under UV–visible irradiation [texte imprimé] / Liangjun Liu, Auteur ; Guoliang Zhang, Auteur ; Ling Wang, Auteur . - 2011 . - pp. 7219–7227. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7219–7227. Mots-clés : Heterogeneous  Catalyst Résumé : Ultrafine Zn–Fe composite oxides have been synthesized by the sol–gel method and then modified by S═O. After preparation, these chalybeate compounds were characterized by BET surface area and porosity analyzer, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectrometry (FT-IR). The influence of introduced S═O on the performance of ZnFe2O4 catalysts was measured, and the reaction mechanism was investigated. To evaluate the activities of different catalysts, a series of photo-Fenton reactions have been conducted to decontaminate the Reactive Black KN-GR simulated wastewater. Results indicated that the prepared catalysts were porous-material with a high specific surface area of 38 m2 g–1. Significantly, the FT-IR spectrum suggested that sulfated ZnFe2O4 calcinated at 773 K (named S773 catalyst) exhibited a strong acid property and XPS analysis proved the presence of S6+(S═O), which led to the generation of acid sites. Under optimum conditions of 9.8 mM H2O2, 0.5 g L–1 catalyst, and pH = 6.0, up to 90% total organic carbon removal and 100% decolorization of a solution containing 100 mg L–1 Reactive Black KN-GR could be achieved after 150 min of treatment. The kinetics of acid catalysis were also discussed, and the stability of the catalyst was estimated on studying the iron leaching and S773 catalyst recycling. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2005516

Physicochemical characteristics of hollow fiber structured packings in isopropanol / water distillation / Zhihong Yang in Industrial & engineering chemistry research, Vol. 49 N° 22 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11594–11601 Titre : Physicochemical characteristics of hollow fiber structured packings in isopropanol / water distillation Type de document : texte imprimé Auteurs : Zhihong Yang, Auteur ; Guoliang Zhang, Auteur ; Feini Liu, Auteur Année de publication : 2011 Article en page(s) : pp. 11594–11601 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Fiber  Water  Distillation Résumé : Three kinds of hollow fiber membrane contactors, polyether sulfone (PES), polysulfone (PS), and polypropylene (PP), were applied in IPA/water distillation to check how the material and structure of membranes would affect the performance. The Hansen solubility parameter (HSP) was calculated to analyze the compatibility between polymers and IPA in operation. It was found that a hydrophobic asymmetric microporous membrane coating thin dense layer on the liquid side with good compatibility worked better in the process, while the membrane with interconnected porous morphology was more favorable for decreasing Rm and more sensitive to vapor load, which might worsen operation stability. Even a slight wetting (<20%) of membrane could result in a sharp decrease as high as 70% of the mass transfer across membrane. As before, all self-made modules in distillation could easily operate at a vapor velocity 5−6 times higher than the flooding limits for conventional packings and achieved an attractive low value of the height of transfer umit (HTU) less than 0.1 m, in which PES hollow fibers performed with excellent stability and gained the highest mass transfer coefficient KL in the experiment. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100437e [article] Physicochemical characteristics of hollow fiber structured packings in isopropanol / water distillation [texte imprimé] / Zhihong Yang, Auteur ; Guoliang Zhang, Auteur ; Feini Liu, Auteur . - 2011 . - pp. 11594–11601. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11594–11601 Mots-clés : Fiber  Water  Distillation Résumé : Three kinds of hollow fiber membrane contactors, polyether sulfone (PES), polysulfone (PS), and polypropylene (PP), were applied in IPA/water distillation to check how the material and structure of membranes would affect the performance. The Hansen solubility parameter (HSP) was calculated to analyze the compatibility between polymers and IPA in operation. It was found that a hydrophobic asymmetric microporous membrane coating thin dense layer on the liquid side with good compatibility worked better in the process, while the membrane with interconnected porous morphology was more favorable for decreasing Rm and more sensitive to vapor load, which might worsen operation stability. Even a slight wetting (<20%) of membrane could result in a sharp decrease as high as 70% of the mass transfer across membrane. As before, all self-made modules in distillation could easily operate at a vapor velocity 5−6 times higher than the flooding limits for conventional packings and achieved an attractive low value of the height of transfer umit (HTU) less than 0.1 m, in which PES hollow fibers performed with excellent stability and gained the highest mass transfer coefficient KL in the experiment. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100437e