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Facile sodium alginate assisted assembly of ni−al layered double hydroxide nanostructures / Hui Wang in Industrial & engineering chemistry research, Vol. 49 N° 6 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2759–2767 Titre : Facile sodium alginate assisted assembly of ni−al layered double hydroxide nanostructures Type de document : texte imprimé Auteurs : Hui Wang, Auteur ; Guoli Fan, Auteur ; Chen Zheng, Auteur Année de publication : 2010 Article en page(s) : pp. 2759–2767 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Facile;  Sodium;  Alginate;  Assembly;  Layered;  Double;  Hydroxide;  Nanostructures Résumé : Self-assembled three-dimensional Ni−Al layered double hydroxide (LDH) nanostructures have been successfully synthesized using a facile biopolymer-assisted approach in the presence of a simple, safe, and inexpensive sodium alginate biopolymer under hydrothermal conditions. The structure and morphology of LDH nanostructures obtained have been investigated by scanning electron microscopy (SEM), powder X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric and differential thermal analysis (TG-DTA), and UV−visible diffuse spectroscopy (UV−vis). Three types of pompon-like, marigold-like, and coral-like LDH nanostructures could be obtained by adjusting the synthesis parameters including hydrothermal aging time, concentration of metal ions, and reaction temperature. A possible formation mechanism for the controlled organization of primary LDH nanosheet building units into special three-dimensional nanostructures is proposed on the basis of the interaction between sodium alginate molecules and LDH crystals. Furthermore, after calcination of LDHs at 500 and 700 °C, the resulting NiO-based mixed metal oxides still maintain the three-dimensional morphology of their LDH precursors to some extent, indicative of the high thermal stability of nanostructures. The findings in this work provide a feasible approach for the morphosynthesis of LDH nanomaterials with special superstructures. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901519h [article] Facile sodium alginate assisted assembly of ni−al layered double hydroxide nanostructures [texte imprimé] / Hui Wang, Auteur ; Guoli Fan, Auteur ; Chen Zheng, Auteur . - 2010 . - pp. 2759–2767. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2759–2767 Mots-clés : Facile;  Sodium;  Alginate;  Assembly;  Layered;  Double;  Hydroxide;  Nanostructures Résumé : Self-assembled three-dimensional Ni−Al layered double hydroxide (LDH) nanostructures have been successfully synthesized using a facile biopolymer-assisted approach in the presence of a simple, safe, and inexpensive sodium alginate biopolymer under hydrothermal conditions. The structure and morphology of LDH nanostructures obtained have been investigated by scanning electron microscopy (SEM), powder X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric and differential thermal analysis (TG-DTA), and UV−visible diffuse spectroscopy (UV−vis). Three types of pompon-like, marigold-like, and coral-like LDH nanostructures could be obtained by adjusting the synthesis parameters including hydrothermal aging time, concentration of metal ions, and reaction temperature. A possible formation mechanism for the controlled organization of primary LDH nanosheet building units into special three-dimensional nanostructures is proposed on the basis of the interaction between sodium alginate molecules and LDH crystals. Furthermore, after calcination of LDHs at 500 and 700 °C, the resulting NiO-based mixed metal oxides still maintain the three-dimensional morphology of their LDH precursors to some extent, indicative of the high thermal stability of nanostructures. The findings in this work provide a feasible approach for the morphosynthesis of LDH nanomaterials with special superstructures. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901519h

Investigation of the structure and catalytic performance of highly dispersed Ni - based catalysts for the growth of carbon nanostructures / Muzi Li in Industrial & engineering chemistry research, Vol. 51 N° 37 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 37 (Septembre 2012) . - pp. 11892–11900 Titre : Investigation of the structure and catalytic performance of highly dispersed Ni - based catalysts for the growth of carbon nanostructures Type de document : texte imprimé Auteurs : Muzi Li, Auteur ; Guoli Fan, Auteur ; Hua Qin, Auteur Année de publication : 2012 Article en page(s) : pp. 11892–11900 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalysts  Nanostructures Résumé : The in situ growth of Ni-containing layered double hydroxide (LDH) microcrystallites on microspherical γ-alumina support was carried out through the surface activation of support followed by a homogeneous coprecipitation process, and carbon nanomaterials were synthesized directly over as-grown supported LDH samples via catalytic chemical vapor deposition of acetylene. As compared to that prepared by the conventional impregnation, supported LDH samples calcined at 700 °C possessed higher metal dispersion, which was attributed to well-developed two-dimensional structure of LDH platelets uniformly grown on the support surface originating from the strong interaction between brucite-like lattices and support. Furthermore, the supported catalyst from NiAl-LDH could catalyze the growth of regular carbon nanofibers, while another one from NiMgAl-LDH exhibited excellent catalytic performance for the growth of uniform carbon nanotubes due to higher metal dispersion achieved by the separating effect of amorphous metal oxide (MgO and Al2O3) phases around Ni nanoparticles. As-synthesized supported Ni-based catalysts are promising for practical applications in the production of carbon nanostructures with uniform geometric shape. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3008659 [article] Investigation of the structure and catalytic performance of highly dispersed Ni - based catalysts for the growth of carbon nanostructures [texte imprimé] / Muzi Li, Auteur ; Guoli Fan, Auteur ; Hua Qin, Auteur . - 2012 . - pp. 11892–11900. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 37 (Septembre 2012) . - pp. 11892–11900 Mots-clés : Catalysts  Nanostructures Résumé : The in situ growth of Ni-containing layered double hydroxide (LDH) microcrystallites on microspherical γ-alumina support was carried out through the surface activation of support followed by a homogeneous coprecipitation process, and carbon nanomaterials were synthesized directly over as-grown supported LDH samples via catalytic chemical vapor deposition of acetylene. As compared to that prepared by the conventional impregnation, supported LDH samples calcined at 700 °C possessed higher metal dispersion, which was attributed to well-developed two-dimensional structure of LDH platelets uniformly grown on the support surface originating from the strong interaction between brucite-like lattices and support. Furthermore, the supported catalyst from NiAl-LDH could catalyze the growth of regular carbon nanofibers, while another one from NiMgAl-LDH exhibited excellent catalytic performance for the growth of uniform carbon nanotubes due to higher metal dispersion achieved by the separating effect of amorphous metal oxide (MgO and Al2O3) phases around Ni nanoparticles. As-synthesized supported Ni-based catalysts are promising for practical applications in the production of carbon nanostructures with uniform geometric shape. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3008659

Synthesis, characterization, and catalytic performance of highly dispersed supported nickel catalysts from Ni – Al layered double hydroxides / Jia Wang in Industrial & engineering chemistry research, Vol. 50 N° 24 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 13717–13726 Titre : Synthesis, characterization, and catalytic performance of highly dispersed supported nickel catalysts from Ni – Al layered double hydroxides Type de document : texte imprimé Auteurs : Jia Wang, Auteur ; Guoli Fan, Auteur ; Hui Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 13717–13726 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalysts  Hydroxides Résumé : Highly dispersed nickel nanoparticles were successfully prepared by reduction of Ni–Al layered double hydroxide precursor (NiAl-LDH) supported on nitric acid modified carbon nanotubes (HCNTs). The physicochemical properties of materials were investigated by powder X-ray diffraction (XRD), temperature programmed reduction (TPR), temperature programmed decomposition (TPDE), temperature programmed desorption (TPD), transmission electron microscopy (TEM), low-temperature nitrogen adsorption–desorption experiments, and X-ray photoelectron spectroscopy (XPS). The results revealed that in the synthesis process of NiAl-LDH and HCNTs composite, l-cysteine could improve the attachment of NiAl-LDH on the HCNTs as bridging linker and inhibit the growth of NiAl-LDH crystallites, thus leading to the formation of highly dispersed and uniform Ni nanoparticles with the small particle sizes. Compared with HCNTs-supported Ni catalyst prepared without the addition of l-cysteine, this highly dispersed Ni catalyst exhibited enhanced catalytic performance in liquid phase hydrogenation of o-chloronitrobenzene to o-chloroaniline. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2015087 [article] Synthesis, characterization, and catalytic performance of highly dispersed supported nickel catalysts from Ni – Al layered double hydroxides [texte imprimé] / Jia Wang, Auteur ; Guoli Fan, Auteur ; Hui Wang, Auteur . - 2012 . - pp. 13717–13726. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 13717–13726 Mots-clés : Catalysts  Hydroxides Résumé : Highly dispersed nickel nanoparticles were successfully prepared by reduction of Ni–Al layered double hydroxide precursor (NiAl-LDH) supported on nitric acid modified carbon nanotubes (HCNTs). The physicochemical properties of materials were investigated by powder X-ray diffraction (XRD), temperature programmed reduction (TPR), temperature programmed decomposition (TPDE), temperature programmed desorption (TPD), transmission electron microscopy (TEM), low-temperature nitrogen adsorption–desorption experiments, and X-ray photoelectron spectroscopy (XPS). The results revealed that in the synthesis process of NiAl-LDH and HCNTs composite, l-cysteine could improve the attachment of NiAl-LDH on the HCNTs as bridging linker and inhibit the growth of NiAl-LDH crystallites, thus leading to the formation of highly dispersed and uniform Ni nanoparticles with the small particle sizes. Compared with HCNTs-supported Ni catalyst prepared without the addition of l-cysteine, this highly dispersed Ni catalyst exhibited enhanced catalytic performance in liquid phase hydrogenation of o-chloronitrobenzene to o-chloroaniline. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2015087

Visible - light - induced heterostructured Zn – Al – In mixed metal oxide nanocomposite photocatalysts derived from a single precursor / Guoli Fan in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011) 

Public ISBD [article]  in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp. 467–474 Titre : Visible - light - induced heterostructured Zn – Al – In mixed metal oxide nanocomposite photocatalysts derived from a single precursor Type de document : texte imprimé Auteurs : Guoli Fan, Auteur ; Wei Sun, Auteur ; Hui Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 467–474 Note générale : Génie chimique Langues : Anglais (eng) Mots-clés : Indium  oxide  Zinc  oxide  Nanocomposite  Photocatalyst  Visible  light Résumé : The present work reported the synthesis of visible-light-induced heterostructured Zn–Al–In mixed metal oxide (ZnAlIn-MMO) nanocomposite photocatalysts derived from Zn–Al–In layered double hydroxide precursors. The structural and optical properties of the novel nanomaterials were characterized by powder X-ray diffraction (XRD), 27Al solid-state nuclear magnetic resonance (NMR), transmission electron microscopy (TEM), low temperature nitrogen adsorption–desorption experiments and UV–vis diffuse reflectance spectroscopy. The results reveal that the well-dispersed amorphous In2O3 domains can be intimately attached to ZnO nanocrystallites in the ZnAlIn-MMO nanocomposites, thus forming the heterostructure of mixed metal oxides, and that the band gaps of ZnAlIn-MMO nanomaterials are in the range of 2.50–2.60 eV, indicative of visible light absorption characteristic. Compared to single-phase In2O3 sample, ZnAlIn-MMO nanocomposites exhibited enhanced photocatalytic activity towards the degradation of methylene blue under visible light irradiation. Especially, ZnAlIn-MMO with the Zn/Al/In molar ratio of 6:1:1 had the highest photocatalytic activity, which was attributable to the efficient separation and transportation of photogenerated charge carriers originating from the novel heterostructure and large specific surface area of such nanocomposite. The present finding provides an approach to fabricate new types of visible-light-induced heteronanostructured photocatalysts. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711011120 [article] Visible - light - induced heterostructured Zn – Al – In mixed metal oxide nanocomposite photocatalysts derived from a single precursor [texte imprimé] / Guoli Fan, Auteur ; Wei Sun, Auteur ; Hui Wang, Auteur . - 2012 . - pp. 467–474. Génie chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp. 467–474 Mots-clés : Indium  oxide  Zinc  oxide  Nanocomposite  Photocatalyst  Visible  light Résumé : The present work reported the synthesis of visible-light-induced heterostructured Zn–Al–In mixed metal oxide (ZnAlIn-MMO) nanocomposite photocatalysts derived from Zn–Al–In layered double hydroxide precursors. The structural and optical properties of the novel nanomaterials were characterized by powder X-ray diffraction (XRD), 27Al solid-state nuclear magnetic resonance (NMR), transmission electron microscopy (TEM), low temperature nitrogen adsorption–desorption experiments and UV–vis diffuse reflectance spectroscopy. The results reveal that the well-dispersed amorphous In2O3 domains can be intimately attached to ZnO nanocrystallites in the ZnAlIn-MMO nanocomposites, thus forming the heterostructure of mixed metal oxides, and that the band gaps of ZnAlIn-MMO nanomaterials are in the range of 2.50–2.60 eV, indicative of visible light absorption characteristic. Compared to single-phase In2O3 sample, ZnAlIn-MMO nanocomposites exhibited enhanced photocatalytic activity towards the degradation of methylene blue under visible light irradiation. Especially, ZnAlIn-MMO with the Zn/Al/In molar ratio of 6:1:1 had the highest photocatalytic activity, which was attributable to the efficient separation and transportation of photogenerated charge carriers originating from the novel heterostructure and large specific surface area of such nanocomposite. The present finding provides an approach to fabricate new types of visible-light-induced heteronanostructured photocatalysts. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711011120

Visible-light-induced photocatalyst based on cobalt-doped zinc ferrite nanocrystals / Guoli Fan in Industrial & engineering chemistry research, Vol. 51 N° 42 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 42 (Octobre 2012) . - pp. 13639-13647 Titre : Visible-light-induced photocatalyst based on cobalt-doped zinc ferrite nanocrystals Type de document : texte imprimé Auteurs : Guoli Fan, Auteur ; Ji Tong, Auteur ; Feng, Li, Auteur Année de publication : 2012 Article en page(s) : pp. 13639-13647 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Nanocrystal  Photocatalysis  Catalyst  Visible  radiation Résumé : The present work reported the synthesis of visible-light-induced cobalt-doped zinc ferrite (Zn1-xCoxFe2O4) photocatalysts via a facile reduction―oxidation route, which involved rapid reduction of Fe3+ and Co2+ cations in colloid mill reactor, followed by oxidation of iron and cobalt nuclei and structural transformation under hydrothermal conditions. The structural and optical properties of materials were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and UV―vis diffuse reflectance spectra. The results indicated that metallic Co and Fe nuclei could be obtained by reduction in the colloid mill, and Zn1-xCoxFe2O4 nanocrystals with uniform size were successfully achieved. Furthermore, compared to ZnFe2O4, Zn1-xCoxFe2O4 samples (x = 0.03, 0.1, 0.2) exhibited enhanced photocatalytic activity in the degradation of methylene blue under visible light irradiation. Especially, the Zn0.8Co0.2Fe2O4 sample had the highest photocatalytic activity, which was mainly attributable to its smaller band edge. Since as-synthesized Zn-Co ferrites nanocrystals have the advantages of intrinsic chemical stability and magnetic property, it can be expected that they may have potential application in the field of industrial photodegradation of organic pollutants. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26508188 [article] Visible-light-induced photocatalyst based on cobalt-doped zinc ferrite nanocrystals [texte imprimé] / Guoli Fan, Auteur ; Ji Tong, Auteur ; Feng, Li, Auteur . - 2012 . - pp. 13639-13647. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 42 (Octobre 2012) . - pp. 13639-13647 Mots-clés : Nanocrystal  Photocatalysis  Catalyst  Visible  radiation Résumé : The present work reported the synthesis of visible-light-induced cobalt-doped zinc ferrite (Zn1-xCoxFe2O4) photocatalysts via a facile reduction―oxidation route, which involved rapid reduction of Fe3+ and Co2+ cations in colloid mill reactor, followed by oxidation of iron and cobalt nuclei and structural transformation under hydrothermal conditions. The structural and optical properties of materials were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and UV―vis diffuse reflectance spectra. The results indicated that metallic Co and Fe nuclei could be obtained by reduction in the colloid mill, and Zn1-xCoxFe2O4 nanocrystals with uniform size were successfully achieved. Furthermore, compared to ZnFe2O4, Zn1-xCoxFe2O4 samples (x = 0.03, 0.1, 0.2) exhibited enhanced photocatalytic activity in the degradation of methylene blue under visible light irradiation. Especially, the Zn0.8Co0.2Fe2O4 sample had the highest photocatalytic activity, which was mainly attributable to its smaller band edge. Since as-synthesized Zn-Co ferrites nanocrystals have the advantages of intrinsic chemical stability and magnetic property, it can be expected that they may have potential application in the field of industrial photodegradation of organic pollutants. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26508188