Thermally stable TiO2 quantum dots embedded in SiO2 foams: Characterization and photocatalytic H2 evolution activity

Pan, Donglai; Han, Zhiya; Miao, Yingchun; Zhang, Dieqing; Li, Guisheng

doi:10.1016/j.apcatb.2018.02.022

Cited by 72 publications

(29 citation statements)

References 61 publications

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“…The phase transformation of bulk anatase to rutile occurs at 600 °C under atmospheric pressure 43 . The retardation of the phase transformation has been examined by hybridizing titania with silica, where the interactions of titania and silica are thought to suppress the growth of anatase and the formation of rutile [44][45][46] . The doped silica particle in the mesoporous titania (with 1-20mass% silica) was reported to hinder the growth of anatase by the heat treatment (below 800 °C) [47][48][49][50][51][52] .…”

Section: Resultsmentioning

confidence: 99%

“…9C. In addition, mesoporous silica-anatase hybrids have been prepared by impregnation method [44][45][46]53 . The location of the anatase particle may not well controlled in the mesoporous silica.…”

Section: Resultsmentioning

confidence: 99%

“…The structural deformation of mesoporous silica-anatase hybrids by the heat treatment at the temperatures over 800 °C was reported to suppress the photocatalysis performance on the degradation of methylene blue and the H 2 evolution from water on the anatase nanoparticle supported in SBA-15 and SiO 2 foam, respectively 45,46 . Efficiency of the oxidation of ethylene on the TiO 2 /SiO 2 photocatalyst prepared by a sol-gel reaction was reduced after the heat treatment above 350 °C, which was ascribed to the decrease in the surface area 61 .…”

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confidence: 99%

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Heterostructural transformation of mesoporous silica–titania hybrids

Paengjun

Vibulyaseak

Ogawa

2021

Sci Rep

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Mesoporous silica (SBA-15 with the BJH pore size of 8 nm) containing anatase nanoparticles in the pore with two different titania contents (28 and 65 mass%), which were prepared by the infiltration of the amorphous precursor derived from tetraisopropyl orthotitanate into the pore, were heat treated in air to investigate the structural changes (both mesostructure of the SBA-15 and the phase and size of the anatase in the pore). The mesostructure of the mesoporous silica and the particle size of anatase unchanged by the heat treatment up to 800 °C. The heat treatment at the temperature higher than 1000 °C resulted in the collapse of the mesostructure and the growth of anatase nanoparticles as well as the transformation to rutile, while the transformation of anatase to rutile was suppressed especially for the sample with the lower titania content (28 mass%). The resulting mesoporous silica-anatase hybrids exhibited higher benzene adsorption capacity (adsorption from water) over those heated at lower temperature, probably due to the dehydroxylation of the silanol group on the pore surface. The photocatalytic decomposition of benzene in water by the present hybrid heated at 1100 °C was efficient as that by P25, a benchmark photocatalyst.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Heterostructural transformation of mesoporous silica–titania hybrids

Paengjun

Vibulyaseak

Ogawa

2021

Sci Rep

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“…We measured and calculated apparent quantum efficiencies (AQE) according to Equation (2): [50] AQE(%)=number of reacted electrons number of incident photons×100newline=number of evolve normalH2 molecules×2number of incident photons×100 where h is the Planck constant (J·s), c is Speed of light (m/s) and λ is the wavelength of linght (nm).…”

Section: Methodsmentioning

confidence: 99%

Enhanced Photocatalytic Degradation of Organic Dyes via Defect-Rich TiO2 Prepared by Dielectric Barrier Discharge Plasma

Wang

et al. 2019

Nanomaterials

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The dye wastewater produced in the printing and dyeing industry causes serious harm to the natural environment. TiO2 usually shows photocatalytic degradation of dye under the irradiation ultravilet light rather than visible light. In this work, a large number of oxygen vacancies and Ti3+ defects were generated on the surface of the TiO2 nanoparticles via Ar plasma. Compared with pristine TiO2 nanoparticles, the as-obtained Ar plasma-treated TiO2 (Ar-TiO2) nanoparticles make the energy band gap reduce from 3.21 eV to 3.17 eV and exhibit enhanced photocatalytic degradation of organic dyes. The Ar-TiO2 obtained exhibited excellent degradation properties of methyl orange (MO); the degradation rate under sunlight irradiation was 99.6% in 30 min, and the photocatalytic performance was about twice that of the original TiO2 nanoparticles (49%). The degradation rate under visible light (λ > 400 nm) irradiation was 89% in 150 min, and the photocatalytic performance of the Ar-TiO2 was approaching ~4 times higher than that of the original TiO2 nanoparticles (23%). Ar-TiO2 also showed good degradation performance in degrading rhodamine B (Rho B) and methylene blue (MB). We believe that this plasma strategy provides a new method for improving the photocatalytic activity of other metal oxides.

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“…Semiconductor photocatalysis has achieved keen attention in utilizing solar power to solve environments deterioration and energy crisis 1–3 . Hence, numerous photocatalyst materials were developed, including TiO 2 4–6 , ZnO 7 , WO 3 8–10 , CdS 11,12 , SnS 2 13 , Ag based photocatalysts 14–16 , etc. However, the development of photocatalysts with high efficient is still a huge and continuous undertaking.…”

Section: Introductionmentioning

confidence: 99%

The improvement of photocatalysis O2 production over BiVO4 with amorphous FeOOH shell modification

Zhang

Shi

Geng

et al. 2019

Sci Rep

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A novel amorphous FeOOH modified BiVO4 photocatalyst (A-FeOOH/BiVO4) was successfully produced and characterized by various techniques. The results showed that amorphous FeOOH with about 2 nm thickness evenly covered on BiVO4 surface, which caused resultant A-FeOOH/BiVO4 exhibiting higher visible light photocatalytic performance for producing O2 from water than BiVO4. When the covered amount of amorphous FeOOH was 8%, the resultant photocatalyst possessed the best photocatalytic performance. To find the reasons for the improvement of photocatalytic property, electrochemical experiments, DRS, PL and BET, were also measured, the experimental results indicated that interface effect between amorphous FeOOH and BiVO4 could conduce to migration of photogenerated charge, and exhibit stronger light responded capacity. These positive factors promoted A-FeOOH/BiVO4 presenting improved the photocatalytic performance. In a word, the combination of amorphous FeOOH with BiVO4 is an effective strategy to conquer important challenges in photocatalysis field.

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Thermally stable TiO2 quantum dots embedded in SiO2 foams: Characterization and photocatalytic H2 evolution activity

Cited by 72 publications

References 61 publications

Heterostructural transformation of mesoporous silica–titania hybrids

Heterostructural transformation of mesoporous silica–titania hybrids

Enhanced Photocatalytic Degradation of Organic Dyes via Defect-Rich TiO2 Prepared by Dielectric Barrier Discharge Plasma

The improvement of photocatalysis O2 production over BiVO4 with amorphous FeOOH shell modification

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