Immobilization of ZnO nanoparticles onto glass spheres: effects of annealing temperature, zinc oxide concentration, and number of coating rounds on the photocatalytic activity under visible light

2021 ◽  
Author(s):  
Bruno Ramos ◽  
Arthur O. G. Silva ◽  
Antonio C. S. C. Teixeira
Keyword(s):  
Zinc Oxide ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Zno Nanoparticles ◽  
Annealing Temperature ◽  
Glass Spheres ◽  
Oxide Concentration

scholarly journals Annealing Temperature-Dependent Effects of Fe-Loading on the Visible Light-Driven Photocatalytic Activity of Rutile TiO2 Nanoparticles and Their Applicability for Air Purification

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 739
Author(s):  
Soong Yeon Kim ◽  
Shahid Saqlain ◽  
Byeong Jun Cha ◽  
Shufang Zhao ◽  
Hyun Ook Seo ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Annealing Temperature ◽  
Separation Efficiency ◽  
Small Scale ◽  
Production Scale ◽  
Rutile Tio2 ◽  
Fe Oxide ◽  
Metal Support Interaction

Commercial rutile TiO2 particles (200–300 nm) were modified by the temperature-regulated chemical vapor deposition (tr-CVD) of Fe-oxide and subsequent annealing at various temperatures (300~750 °C). As a result of the modification, the photocatalytic activity of the TiO2 regarding acetaldehyde removal under visible light was enhanced, and the enhancement effects were dependent on the annealing temperature. Specifically, the enhancement effects of the modification were most pronounced when Fe-TiO2 was annealed at 375 °C, whereas the effects were significantly reduced by annealing at higher temperatures (525 and 750 °C). The analytical results with various techniques, including two surface-sensitive methods (XPS (X-ray photoelectron spectroscopy) and TOF-SIMS (time of fight-secondary ion mass spectrometry)), revealed that the stronger metal support interaction between TiO2 and the loaded Fe-oxide at high temperature (>375 °C) resulted in the decreased charge separation efficiency and photocatalytic activity of the Fe-TiO2 under light irradiation. The production scale for the Fe-TiO2 photocatalysts can be easily increased (from 200 g to 8 kg per the unit process) by upsizing the reactor volume. The mass-produced samples exhibited similar activity to the samples produced at small scale, and they were photocatalytically active after being spread on a cement block (stainless steel plate) using a surface hardening agent (paint), showing the high applicability in real applications.

Enhancing visible light photocatalytic activity of bismuth vanadate with the loading of zinc oxide

2019 ◽  
Vol 12 (01) ◽  
pp. 1850110 ◽  
Author(s):  
Mengjun Liang ◽  
Lu Chen ◽  
Zhiyuan Yang ◽  
Zhen Zeng ◽  
Shuijin Yang
Keyword(s):  
Zinc Oxide ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Specific Surface ◽  
Visible Light Irradiation ◽  
Charge Separation ◽  
Facile Hydrothermal Method ◽  
Excellent Photocatalytic Activity ◽  
Efficient Charge ◽  
Visible Light Photocatalytic

ZnO/Bi4V2O[Formula: see text] nanocomposites were prepared via a facile hydrothermal method by loading different amounts of ZnO onto the surface of Bi4V2O[Formula: see text]. The resulting ZnO/Bi4V2O[Formula: see text] composites showed excellent photocatalytic activity than that of pure ZnO under visible light irradiation. When the ratio of ZnO to Bi4V2O[Formula: see text] was 1:1 (ZB2), the photocatalytic activity was best, which could degrade RhB almost completely within 30[Formula: see text]min. The enhanced photocatalytic activity of ZnO/Bi4V2O[Formula: see text] composites could be mainly ascribed to the efficient charge separation and the increased specific surface area. Based on the experimental and bandgap calculations, a possible photocatalytic mechanism was proposed.

Enhanced visible-light photocatalytic activity of strontium-doped zinc oxide nanoparticles

2015 ◽  
Vol 32 ◽  
pp. 152-159 ◽  
Author(s):  
Ramin Yousefi ◽  
Farid Jamali-Sheini ◽  
Mohsen Cheraghizade ◽  
Sara Khosravi-Gandomani ◽  
Abdolhossein Sáaedi ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Zinc Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Photocatalytic

Synthesis of Indium Sulfide/Zinc Oxide Composites Films and their Photocatalytic Activities

2019 ◽  
Vol 886 ◽  
pp. 146-153
Author(s):  
Natkritta Boonprakob ◽  
Anchalee Masa-Ad
Keyword(s):  
Zinc Oxide ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Rhodamine B ◽  
Composite Films ◽  
Weight Ratio ◽  
Composite Catalyst ◽  
Zno Films ◽  
Light Illumination ◽  
Indium Sulfide

Indium sulfide and zinc oxide (In2S3-ZnO) films have successfully synthesized by doctor blading method coupling with low temperature precipitation-reflux rout. The weight ratio of In2S3 was varied from 0-70 wt.%. Physical characterization results obtained from various analytical techniques exhibit the well crystallinity phase of cubic β-In2S3 and wurtzite ZnO structure from XRD patterns. TEM micrograph of 35% In2S3-ZnO sample showed the small ZnO particles are embedded into β-In2S3. The obtained results exhibited the phase well crystallinity of cubic β-In2S3. A strong adsorption spectra shifted toward visible light region and the narrower optical band gap results of In2S3-ZnO composite films suggesting that synthesized samples could be used as the visible-light-driven photocatalyst. The photocatalytic activity of rhodamine B had been investigated over entire composite films under visible light illumination. It can be seen that the entire In2S3-ZnO composite catalyst films revealed degradation of rhodamine B performance obviously higher than pure ZnO and pure In2S3. Moreover, the highest photocatalytic activity was found from 35% wt. In2S3-ZnO film which showed 69.5% degradation within 4 h under visible light irradiation.

Effect of Cr Doping on Visible-Light-Driven Photocatalytic Activity of ZnO Nanoparticles

2019 ◽  
Vol 48 (11) ◽  
pp. 7378-7388 ◽  
Author(s):  
Thao Kim Truong ◽  
Thuan Van Doan ◽  
Huy Hong Tran ◽  
Hieu Van Le ◽  
Vinh Quang Lam ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Zno Nanoparticles ◽  
Visible Light Driven ◽  
Cr Doping
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