Photocatalytic activity of WOx-TiO2 under visible light irradiation

Li, X.Z; Li, F.B; Yang, Can; Ge, Weikun

doi:10.1016/s1010-6030(01)00446-4

Cited by 667 publications

(218 citation statements)

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“…A series of prominent diffraction peaks at nearly 25. ion radius of both [16]. In addition, there are no peaks at nearly 20.45 • and 22.83 • in spectra, revealing the absence of solid solution of W x Ti 1 − x O 2 , as reported [36].…”

Section: Resultssupporting

confidence: 64%

Enhanced visible-light-driven photocatalytic performance of mesoporous W-Ti-SBA-15 prepared through a facile hydrothermal route

Chang

Wang

Luo

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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h i g h l i g h t s• A series of tungsten-titaniumcocontained SBA15 composites were fabricated by a simple synthetic route.• These samples showed enhanced catalytic performance in comparison to those comprising bare tungsten or titanium component.• The enhancement of photocatalytic behavior under visible-light irradiation was discussed. t r a c tA facile and one-step hydrothermal procedure was adopted to fabricate a series of W-Ti-SBA15 composites (WTS). These as-prepared composites were systematically characterized by a collection of analytic and spectroscopic techniques. It was found that dual phases of titanium and tungsten species coexisted in mesoporous structures of p6 mm hexagonal symmetry. In addition, these composites were visible-light responsive and exhibited enhanced photocatalytic capability toward degradation of Rhodamine B (RhB) and 2,4-dichlorophenol (2,4-DCP) upon visible-light irradiation in comparison to samples containing single component of titanium or tungsten species. Specifically, the best candidate, sample 8%WTS0.7, had the largest apparent reaction rate constant that was nearly 1.2, 2.1, 2.2, and 5.7 times as high as those of 8%WS, TS0.7, WO 3 /TiO 2 , and N-TiO 2 , respectively. The enhancement of photocatalytic performance was mainly attributed to the well-matched band structures of both components and strengthened visiblelight adsorption ability, originating from the combination of titania with highly acidic WO 3 in SBA15 matrix with large specific surface areas. Active radical species were detected by trapping experiments and a possible photocatalytic mechanism was thus proposed.

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Section: Resultssupporting

confidence: 64%

Enhanced visible-light-driven photocatalytic performance of mesoporous W-Ti-SBA-15 prepared through a facile hydrothermal route

Chang

Wang

Luo

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Many studies have been made in the development of photocatalysts that can efficiently utilize solar or indoor light. The approaches include the modification of TiO 2 [19][20][21][22][23][24][25] and the development of new type photocatalysts, such as SrTiO 3 [26], Bi 2 GaTaO 7 [27], InTaO 4 [28]. However, the report about the photocatalyst possessing of magnetic property and visible-light activity is hardly found.…”

Section: Introductionmentioning

confidence: 99%

Preparations and photocatalytic degradation of methyl orange in water on magnetically separable Bi₁₂TiO₂₀supported on nickel ferrite

Shangguan²,

Yuan

et al. 2007

Science and Technology of Advanced Materials

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A magnetically separable photocatalyst Bi 12 TiO 20 /SiO 2 /NiFe 2 O 4 (BSN) with a typical ferromagnetic hysteresis was prepared by a simple process: the magnetic 200 wt% SiO 2 /NiFe 2 O 4 (SN) dispersion prepared by a liquid catalytic phase transformation method and the visible-light-active photocatalyst Bi 12 TiO 20 prepared by a simple coprecipitation processing were mixed, sonificated, dried, and calcined at 550 1C. The prepared photocatalyst showed high photocatalytic activity for the degradation of methyl orange in water under UV irradiation and visible-light irradiation (l4400 nm), and it was easy to be separated from a slurry-type photoreactor under the application of an external magnetic field, being one of promising photocatalysts for wastewater treatment. Transmission electron microscope (TEM) and X-ray diffractometer (XRD) were used to characterize the structure of the photocatalyst, indicating that the magnetic SN particles adhered to the surface of the Bi 12 TiO 20 congeries. SiO 2 layer round the surface of NiFe 2 O 4 nanoparticles prevented effectively the injection of charges from TiO 2 particles to NiFe 2 O 4 , which gave rise to the increase in photocatalytic activity. r

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“…The assignment of the peak at 532.3 eV was ambiguous. It has been attributed to adsorbed oxygen, surface oxygen vacancies, hydroxyl group, and absorbed water [38]- [45]. Here, we assigned this peak to hydroxyl group existed on the surface of the TiO 2 and Ag/TiO 2 film.…”

Section: Timentioning

confidence: 82%

“…Therefore the holes were formed in the valence band. The holes were assumed to be trapped by lattice oxygen atoms on the surface of the TiO 2 film [38]- [47]. The trapped hole was thought to weaken the bond between the titanium atom and the lattice oxygen atom.…”

Section: Timentioning

confidence: 99%

Photocatalytic Destruction of Methylene Blue on Ag@TiO<sub>2</sub> with Core/Shell Structure

Chen¹,

Lee²

2014

OALib

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A series of Ag@TiO 2 catalysts with core-shell structure were successfully synthesized by a sol-gel method. The samples were prepared by a sol-gel method using silver nitrate, hydrazine, cetyltrimethylammonium bromide and titanium tetra-isopropoxide as the starting materials. The catalysts were characterized by ICP-MS, XRD, TEM, HRTEM and XPS. The results indicated that the silver core was in metallic state and the TiO 2 shell was in anatase state. The size of Ag nanoparticles in core was about 5 and 10 nm, and the shell size of titanium dioxide was 10 and 20 nm. The core was single crystalline Ag nanoparticle and the shell was made up of many TiO 2 nanoparticles. The photocatalytic activity of Ag@TiO 2 was much higher than that of bare TiO 2 . Large amounts of hydroxyl groups were present on the surface of TiO 2 . The catalysts which were treated by hydrothermal method had the higher lattice oxide percentage and higher photocatalytic activities. The core-shell structure can prevent Ag from aggregation.

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Photocatalytic activity of WOx-TiO2 under visible light irradiation

Cited by 667 publications

References 50 publications

Enhanced visible-light-driven photocatalytic performance of mesoporous W-Ti-SBA-15 prepared through a facile hydrothermal route

Enhanced visible-light-driven photocatalytic performance of mesoporous W-Ti-SBA-15 prepared through a facile hydrothermal route

Preparations and photocatalytic degradation of methyl orange in water on magnetically separable Bi₁₂TiO₂₀supported on nickel ferrite

Photocatalytic Destruction of Methylene Blue on Ag@TiO<sub>2</sub> with Core/Shell Structure

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Photocatalytic activity of WOx-TiO2 under visible light irradiation

Cited by 667 publications

References 50 publications

Enhanced visible-light-driven photocatalytic performance of mesoporous W-Ti-SBA-15 prepared through a facile hydrothermal route

Enhanced visible-light-driven photocatalytic performance of mesoporous W-Ti-SBA-15 prepared through a facile hydrothermal route

Preparations and photocatalytic degradation of methyl orange in water on magnetically separable Bi12TiO20supported on nickel ferrite

Photocatalytic Destruction of Methylene Blue on Ag@TiO<sub>2</sub> with Core/Shell Structure

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Preparations and photocatalytic degradation of methyl orange in water on magnetically separable Bi₁₂TiO₂₀supported on nickel ferrite