Template-free synthesis of hierarchical porous SnO2

Li, Guisheng; Leung, Michael K. H.

doi:10.1007/s10971-009-2122-z

Cited by 9 publications

(5 citation statements)

References 36 publications

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“…Thus, the region of O 1s could be deconvoluted into three peaks centered at 530.3, 530.8, and 531.5 eV. The lower binding energy peak at 530.3 eV was attributed to oxygen in SnO 2 , , while the peak centered at 530.8 eV is due to the Zn–O binding . The peak at 531.5 eV could be ascribed to adsorbed hydroxyl species. ,, The results confirmed that the SnO 2 –ZnO photocatalyst was actually composed of SnO 2 and ZnO entities.…”

Section: Resultsmentioning

confidence: 57%

“…The lower binding energy peak at 530.3 eV was attributed to oxygen in SnO 2 , , while the peak centered at 530.8 eV is due to the Zn–O binding . The peak at 531.5 eV could be ascribed to adsorbed hydroxyl species. ,, The results confirmed that the SnO 2 –ZnO photocatalyst was actually composed of SnO 2 and ZnO entities. To determine the band alignment of the SnO 2 –ZnO nanocatalyst, the core level positions and the VBM positions of bulk SnO 2 and bulk ZnO were also determined .…”

Section: Resultsmentioning

confidence: 63%

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Nanostructured SnO₂–ZnO Heterojunction Photocatalysts Showing Enhanced Photocatalytic Activity for the Degradation of Organic Dyes

et al. 2012

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Nanoporous SnO(2)-ZnO heterojunction nanocatalyst was prepared by a straightforward two-step procedure involving, first, the synthesis of nanosized SnO(2) particles by homogeneous precipitation combined with a hydrothermal treatment and, second, the reaction of the as-prepared SnO(2) particles with zinc acetate followed by calcination at 500 °C. The resulting nanocatalysts were characterized by X-ray diffraction (XRD), FTIR, Raman, X-ray photoelectron spectroscopy (XPS), nitrogen adsorption-desorption analyses, transmission electron microscopy (TEM), and UV-vis diffuse reflectance spectroscopy. The SnO(2)-ZnO photocatalyst was made of a mesoporous network of aggregated wurtzite ZnO and cassiterite SnO(2) nanocrystallites, the size of which was estimated to be 27 and 4.5 nm, respectively, after calcination. According to UV-visible diffuse reflectance spectroscopy, the evident energy band gap value of the SnO(2)-ZnO photocatalyst was estimated to be 3.23 eV to be compared with those of pure SnO(2), that is, 3.7 eV, and ZnO, that is, 3.2 eV, analogues. The energy band diagram of the SnO(2)-ZnO heterostructure was directly determined by combining XPS and the energy band gap values. The valence band and conduction band offsets were calculated to be 0.70 ± 0.05 eV and 0.20 ± 0.05 eV, respectively, which revealed a type-II band alignment. Moreover, the heterostructure SnO(2)-ZnO photocatalyst showed much higher photocatalytic activities for the degradation of methylene blue than those of individual SnO(2) and ZnO nanomaterials. This behavior was rationalized in terms of better charge separation and the suppression of charge recombination in the SnO(2)-ZnO photocatalyst because of the energy difference between the conduction band edges of SnO(2) and ZnO as evidenced by the band alignment determination. Finally, this mesoporous SnO(2)-ZnO heterojunction nanocatalyst was stable and could be easily recycled several times opening new avenues for potential industrial applications.

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Section: Resultsmentioning

confidence: 57%

Section: Resultsmentioning

confidence: 63%

Nanostructured SnO₂–ZnO Heterojunction Photocatalysts Showing Enhanced Photocatalytic Activity for the Degradation of Organic Dyes

et al. 2012

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“…It is also usually suggested that the binding energies of Sn 3d5/2 and Sn 3d3/2 are usually located at 486.4 eV and 495.0 eV, respectively. 43,46 Both of the binding energies of Sn 3d5/2 and Sn 3d3/2 in the ternary heterostructures slightly shift by 0.2 eV toward low energy, also demonstrating the possibly increased surface electron density of SnO 2 by construction of the ternary heterostructures. The nitrogen adsorption-desorption isotherm and the corresponding pore size distribution of TiO 2 /SnO x -Au (1 wt%) and TiO 2 /Au (1 wt%) are shown in Fig.…”

Section: Resultsmentioning

confidence: 88%

In situ synthesis of TiO₂/SnO_x–Au ternary heterostructures effectively promoting visible-light photocatalysis

Zhao

et al. 2015

Dalton Trans.

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TiO2/SnOx-Au ternary heterostructures were successfully fabricated via a simple in situ reduction of AuCl4(-) on TiO2 surfaces pre-modified with Sn(2+). The samples were characterized by XRD, TEM, XPS, N2 physical absorption and UV-vis diffuse reflectance spectra. Photocatalytic activity toward degradation of methylene blue (MB) aqueous solution under visible light irradiation was investigated. The results suggested that the highly dispersive and ultrafine Au nanoparticles (NPs) covered with SnOx were deposited onto the surface of TiO2. The heterostructures significantly enhanced the photocatalytic activity compared with the traditional TiO2/Au sample prepared by the impregnation method and also enhanced the activity more than the binary TiO2/SnOx sample. Moreover, the size of the Au NPs could be well controlled by simply tuning the dosage of HAuCl4, and the optimized catalytic activity of the ternary heterostructures was obtained when the dosage of Au was 1% and the Au particle size was ∼2.65 nm. The enhancement of photocatalytic performance could be attributed to the surface plasmon resonance effect of the Au NPs and the electron-sink function of the SnOx, which improve the optical absorption properties as well as photoinduced charge carrier separation, synergistically facilitating the photocatalysis.

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“…3d. In this spectrum, the coupling peaks appearing at 530.2 eV and 530.7 eV are attributed to oxygen at the Sn-O and Zn-O bonds, respectively [57,58].…”

Section: Surface Chemical Compositionmentioning

confidence: 97%

Biosynthesis of the ZnO/SnO2 nanoparticles and characterization of their photocatalytic potential for removal of organic water pollutants

Sayadi

Ghollasimood

Ahmadpour

et al. 2022

Journal of Photochemistry and Photobiology A: Chemistry

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Template-free synthesis of hierarchical porous SnO2

Cited by 9 publications

References 36 publications

Nanostructured SnO₂–ZnO Heterojunction Photocatalysts Showing Enhanced Photocatalytic Activity for the Degradation of Organic Dyes

Nanostructured SnO₂–ZnO Heterojunction Photocatalysts Showing Enhanced Photocatalytic Activity for the Degradation of Organic Dyes

In situ synthesis of TiO₂/SnO_x–Au ternary heterostructures effectively promoting visible-light photocatalysis

Biosynthesis of the ZnO/SnO2 nanoparticles and characterization of their photocatalytic potential for removal of organic water pollutants

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Template-free synthesis of hierarchical porous SnO2

Cited by 9 publications

References 36 publications

Nanostructured SnO2–ZnO Heterojunction Photocatalysts Showing Enhanced Photocatalytic Activity for the Degradation of Organic Dyes

Nanostructured SnO2–ZnO Heterojunction Photocatalysts Showing Enhanced Photocatalytic Activity for the Degradation of Organic Dyes

In situ synthesis of TiO2/SnOx–Au ternary heterostructures effectively promoting visible-light photocatalysis

Biosynthesis of the ZnO/SnO2 nanoparticles and characterization of their photocatalytic potential for removal of organic water pollutants

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Nanostructured SnO₂–ZnO Heterojunction Photocatalysts Showing Enhanced Photocatalytic Activity for the Degradation of Organic Dyes

Nanostructured SnO₂–ZnO Heterojunction Photocatalysts Showing Enhanced Photocatalytic Activity for the Degradation of Organic Dyes

In situ synthesis of TiO₂/SnO_x–Au ternary heterostructures effectively promoting visible-light photocatalysis