Synthesis of Titania Nanosheets with a High Percentage of Exposed (001) Facets and Related Photocatalytic Properties

Han, Xiang; Kuang, Qin; Jin, Mingshang; Xie, Zhaoxiong; Zheng, Lan‐Sun

doi:10.1021/ja8092373

Cited by 1,546 publications

(1,387 citation statements)

References 23 publications

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“…It is noteworthy that the F-TiO 2 sample has the lowest PL signals among the as-prepared catalysts and P25. It has been reported that the Ti-F group on the F-TiO 2 surface could act as an electrontrapping site to trap the photo-generated electrons, by holding trapped electrons and then transferring them to O 2 adsorbed on the TiO 2 surface [23,34,39]. Thus, the Ti-F group accounts for the very low PL spectra intensity of F-TiO 2 .…”

Section: Uv-vis and Pl Analysismentioning

confidence: 99%

“…In controllable synthesis of TiO 2 with exposed (0 0 1) facets, fluorine has been commonly used as a morphology-controlling agent to lower the surface energy in order to expose the reactive (0 0 1) facets [23,32,33]. Anatase TiO 2 with a high percentage of the reactive (0 0 1) facets has exhibited excellent photoreactivity, even much better than pure anatase TiO 2 or commercial P25 in photocatalytic reactions, such the oxidation of acetone [23], OH radical generation [24] and the degradation of methylene orange (MO) [34] and methylene blue (MB) [35], etc. However, it is also reported that, compared with the other two facets, (0 0 1) facets are not always more reactive for some reactions, such as the reaction of hydrogen generation under UV light irradiation [36,37].…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic oxidation of gaseous ammonia over fluorinated TiO2 with exposed (001) facets

et al. 2014

Applied Catalysis B: Environmental

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a b s t r a c tA surface-fluorinated TiO 2 (F-TiO 2 ) catalyst was synthesized by a hydrothermal method using hydrofluoric acid (HF) solution as a capping agent, and defluorinated TiO 2 (D-TiO 2 ) was next obtained by washing the F-TiO 2 with NaOH solution. The as-prepared catalysts were tested for the photocatalytic oxidation (PCO) of gaseous NH 3 under UV light. The F-TiO 2 catalyst exhibited remarkable activity for NH 3 removal, about twice as high as that of the commercial catalyst P25. In contrast, D-TiO 2 showed an obvious decrease in PCO activity. The catalysts were characterized by X-ray diffractometry (XRD), Brunauer-Emmett-Teller (BET) adsorption analysis, High-resolution Transmission electron microscopy (HR-TEM), and X-ray photoelectron spectroscopy (XPS). The results showed that the surface fluorination process formed the surface Ti-F group and also increased the percentage of reactive (0 0 1) facets to about 50%; the surface defluorination removed the fluorine (F) element from the F-TiO 2 surface but showed no influence on the percentage of reactive (0 0 1) facets. By comparing the specific activities of the catalysts, we found that both the active (0 0 1) facets and the surface Ti-F group contributed to the improvement of the PCO activity, while the surface Ti-F group plays the dominant role. The Ti-F group could retard the recombination of photogenerated electrons and holes, which is possibly the major reason for the excellent activity of the F-TiO 2 catalyst.

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Section: Uv-vis and Pl Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photocatalytic oxidation of gaseous ammonia over fluorinated TiO2 with exposed (001) facets

et al. 2014

Applied Catalysis B: Environmental

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“…39 The high-resolution TEM (HRTEM) image (bottom inset in Figure 3b) showed that the lattice fringes spacing of 0.235 nm parallel to the top and bottom facets were assigned to (001) planes of anatase TiO 2 . 46 That is, the composite photocatalysts prepared with 7.2 wt % MWCNTs consisted of MWCNTs wrapping around the anatase TiO 2 spheres with exposed single-crystal {001} facets. The percentage of exposed {001} facets was estimated as 74%.…”

Section: Characterization Of Structure and Morphologymentioning

confidence: 99%

Synthesis of Carbon Nanotube–Anatase TiO₂ Sub-micrometer-sized Sphere Composite Photocatalyst for Synergistic Degradation of Gaseous Styrene

Chen

Nie

et al. 2012

ACS Appl. Mater. Interfaces

133

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ABSTRACT:The carbon nanotube (CNT)−sub-micrometer-sized anatase TiO 2 sphere composite photocatalysts were synthesized by a facile one-step hydrothermal method using titanium tetrafluoride as titanium source and CNTs as structure regulator. Various technologies including X-ray diffraction, UV−visible absorption spectra, N 2 adsorption−desorption, scanning electron microscopy, and transmission electron microscopy were employed to characterize the structure properties of the prepared composite photocatalysts. The results indicated that the composite photocatalysts consisted of CNTs wrapping around the sub-micrometer-sized anatase TiO 2 spheres with controllable crystal facets and that the aggregated particles with average diameter ranged from 200 to 600 nm. The fabricated composite photocatalysts were used to degrade gaseous styrene in this work. As expected, a synergistic effect that remarkably enhancing the photocatalytic degradation efficiency of gaseous styrene by the prepared composite photocatalysts was observed in comparison with that the degradation efficiency using pure anatase TiO 2 and the adsorption of CNTs. Similar results were also confirmed in the decolorization of liquid methyl orange. Further investigation demonstrated that the synergistic effect in the photocatalytic activity was related to the structure of the sub-micrometer-sized anatase TiO 2 spheres and the significant roles of CNTs in the composite photocatalysts. By controlling the content of CNTs, the content of TiO 2 or the temperature during the hydrothermal synthesis process, anatase TiO 2 spheres with controllable crystallite size and dominant crystal facets such as {001}, {101}, or polycrystalline could be obtained, which was beneficial for the increase in the synergistic effect and further enhancement of the photocatalytic efficiencies.

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“…Therefore, the CdMoO 4 products with high crystallinity demonstrated excellent photocatalytic activity. On the other hand, the morphologies and exposed facets of photocatalyst are also important to its photocatalytic activity [34][35][36] . Based on the results of this study, the photocatalytic activity of CdMoO 4 is closely related to not only the crystallinity but also the facet.…”

Section: Optical Properties Photocatalytic Activities and Photostabimentioning

confidence: 99%

CdMoO4 Micro-ellipsoids: Controllable Synthesis, Growth Mechanism, and Photocatalytic Activity

Liu

Gao

et al. 2016

Mat. Res.

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CdMoO 4 micro-ellipsoids were synthesized by a simple hydrothermal route with the assistance of nonionic surfactant Triton X-100 and characterized by X-ray diffraction, scanning electron microscopy and UV-Vis diffuse reflectance spectroscopy. The effects of hydrothermal pH, temperature, and time on the morphology and photocatalytic activity of CdMoO 4 were investigated. With an initial hydrothermal pH of 5.00, CdMoO 4 micro-ellipsoids were obtained at 180 °C for 24 h and found to possess the highest photocatalytic activity-89% Rhodamine B can be degraded for 30 minutes presented in the 0.4 g/L CdMoO 4 suspension. The formation mechanism of the CdMoO 4 micro-ellipsoids was initiated by the formation of small nanoparticles and bulk structures afterwards, which was followed by the growth of micro-ellipsoids. Experiment results showed that the evolution of the micro-ellipsoids was an Ostwald ripening process.

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Synthesis of Titania Nanosheets with a High Percentage of Exposed (001) Facets and Related Photocatalytic Properties

Cited by 1,546 publications

References 23 publications

Photocatalytic oxidation of gaseous ammonia over fluorinated TiO2 with exposed (001) facets

Photocatalytic oxidation of gaseous ammonia over fluorinated TiO2 with exposed (001) facets

Synthesis of Carbon Nanotube–Anatase TiO₂ Sub-micrometer-sized Sphere Composite Photocatalyst for Synergistic Degradation of Gaseous Styrene

CdMoO4 Micro-ellipsoids: Controllable Synthesis, Growth Mechanism, and Photocatalytic Activity

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Synthesis of Titania Nanosheets with a High Percentage of Exposed (001) Facets and Related Photocatalytic Properties

Cited by 1,546 publications

References 23 publications

Photocatalytic oxidation of gaseous ammonia over fluorinated TiO2 with exposed (001) facets

Photocatalytic oxidation of gaseous ammonia over fluorinated TiO2 with exposed (001) facets

Synthesis of Carbon Nanotube–Anatase TiO2 Sub-micrometer-sized Sphere Composite Photocatalyst for Synergistic Degradation of Gaseous Styrene

CdMoO4 Micro-ellipsoids: Controllable Synthesis, Growth Mechanism, and Photocatalytic Activity

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Synthesis of Carbon Nanotube–Anatase TiO₂ Sub-micrometer-sized Sphere Composite Photocatalyst for Synergistic Degradation of Gaseous Styrene