An efficient and magnetically recoverable g-C3N4/ZnS/CoFe2O4 nanocomposite for sustainable photodegradation of organic dye under UV–visible light illumination

2021 ◽  
pp. 111429
Author(s):  
G. Palanisamy ◽  
Nora Hamad Al-Shaalan ◽  
K. Bhuvaneswari ◽  
G. Bharathi ◽  
G. Bharath ◽  
...  
Keyword(s):  
Visible Light ◽  
Organic Dye ◽  
Light Illumination ◽  
Visible Light Illumination ◽  
Uv Visible

In situ preparation of Bi2S3 nanoribbon-anchored BiVO4 nanoscroll heterostructures for the catalysis of Cr(vi) photoreduction

2020 ◽  
Vol 10 (12) ◽  
pp. 3843-3847 ◽  
Author(s):  
Jianqiang Hu ◽  
Fen Zhang ◽  
Yong Yang ◽  
Qiutong Han ◽  
Zhaosheng Li ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Light Illumination ◽  
In Situ Preparation ◽  
Visible Light Illumination ◽  
Uv Visible

Novel Bi2S3 nanoribbon-anchored BiVO4 nanoscroll heterostructures were fabricated, showing enhanced photocatalytic activity for Cr(vi) reduction under UV-visible light illumination.

Photocatalytic Reaction Properties of TiO2-Supported on the Long Lasting Phosphor: Sr4Al14O25:Eu2+,Dy3+

2021 ◽  
Vol 21 (7) ◽  
pp. 3729-3734
Author(s):  
Hyun-Je Sung ◽  
Sang-Chul Jung ◽  
Jung-Sik Kim
Keyword(s):  
Titanium Dioxide ◽  
Visible Light ◽  
Energy Band ◽  
Wavelength Region ◽  
Light Illumination ◽  
Photocatalytic Reaction ◽  
Strontium Aluminate ◽  
Aluminate Phosphor ◽  
Visible Light Illumination ◽  
Uv Visible

The TiO2/Sr4Al14O25:Eu2+,Dy3+ photocatalytic composite was prepared by depositing the nano-crystalline titanium dioxide layer on the long-lasting phosphor substrate of strontium aluminate, using a low-pressure chemical vapor deposition (LP-CVD). The photocatalysis characteristic was studied by examining the photodegradation of benzene (C6H6) gas under UV, visible light illumination, and in the darkness. The photocatalytic composite of TiO2-deposited Sr4Al14O25:Eu2+,Dy3+ showed an active photocatalytic reactivity under UV-light as well as visible-light illumination. The mechanism of the photocatalysis reaction for the TiO2-deposited strontium aluminate phosphor composite was interpreted in point of the energy band structure and phosphorescent emission. The coupling of nanocrystalline TiO2 with the strontium aluminate phosphor might result in an energy band bending at the interface of TiO2/Sr4Al14O25:Eu2+,Dy3+, making the titanium dioxide at the junction to be photo-reactive even in a visible wavelength region. In addition, the depth profile of Auger electron spectroscopy (AES) confirmed a possible formation of oxygen vacancies at the interface between TiO2 and Sr4Al14O25:Eu2+,Dy3+. Then, oxygen defects create extra electrons which may excited subsequently to the conduction band and participate in a photocatalytic reaction, resulting in an enhancement of the photodecomposition of benzene. The LP-CVD TiO2-strontium aluminate phosphor was also photoactive in the darkness because of light emission from the long lasting phosphor. Also, the TiO2-deposited Sr4Al14O25:Eu2+,Dy3+ long lasting phosphor was analyzed by a XRD (X-ray diffraction), TEM (transmission electron microscopy), UV/visible spectroscopy and AES.

Fabrication and Characterization of NiOx/Bi2WO6 with Enhanced Photocatalytic Activity under Visible Light Illumination

2013 ◽  
Vol 690-693 ◽  
pp. 429-432
Author(s):  
Chun Ma
Keyword(s):  
Visible Light ◽  
Separation Efficiency ◽  
Diffuse Reflectance Spectroscopy ◽  
Light Illumination ◽  
X Ray Diffraction ◽  
Electron Pairs ◽  
X Ray ◽  
Visible Light Illumination ◽  
Uv Visible

The NiOx/Bi2WO6 photocatalyst with p-n heterojunction structure was synthesized. And the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-visible diffuse reflectance spectroscopy (UV-vis DRS). It was found that the RhB degradation rate with NiOx/Bi2WO6 was 1.62 times as great as that with the Bi2WO6 under visible light (λ>400 nm) by the photocatalytic measurements. The enhanced photocatalytic performance of the NiOx/Bi2WO6 sample was attributed to the improved separation efficiency of photogenerated hole-electron pairs generated by the p-n heterojunction between Bi2WO6 and NiOx.

Photoelectrocatalytic Oxidation of Organics Under Visible Light Illumination: A Short Review

2015 ◽  
Vol 19 (6) ◽  
pp. 512-520 ◽  
Author(s):  
Nikolaos Karanasios ◽  
Jenia Georgieva ◽  
Eugenia Valova ◽  
Stephan Armyanov ◽  
Georgios Litsardakis ◽  
...  
Keyword(s):  
Visible Light ◽  
Short Review ◽  
Light Illumination ◽  
Photoelectrocatalytic Oxidation ◽  
Visible Light Illumination ◽  
Oxidation Of Organics

scholarly journals Enhanced Visible-Light Photocatalytic Performance of SAPO-5-Based g-C3N4 Composite for Rhodamine B (RhB) Degradation

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3948
Author(s):  
Lingfang Qiu ◽  
Zhiwei Zhou ◽  
Mengfan Ma ◽  
Ping Li ◽  
Jinyong Lu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Redox Reactions ◽  
Photocatalytic Performance ◽  
Dye Degradation ◽  
Thermal Polymerization ◽  
Light Illumination ◽  
Electron Hole ◽  
Visible Light Illumination ◽  
Visible Light Photocatalytic

Novel visible-light responded aluminosilicophosphate-5 (SAPO-5)/g-C3N4 composite has been easily constructed by thermal polymerization for the mixture of SAPO-5, NH4Cl, and dicyandiamide. The photocatalytic activity of SAPO-5/g-C3N4 is evaluated by degrading RhB (30 mg/L) under visible light illumination (λ > 420 nm). The effects of SAPO-5 incorporation proportion and initial RhB concentration on the photocatalytic performance have been discussed in detail. The optimized SAPO-5/g-C3N4 composite shows promising degradation efficiency which is 40.6% higher than that of pure g-C3N4. The degradation rate improves from 0.007 min−1 to 0.022 min−1, which is a comparable photocatalytic performance compared with other g-C3N4-based heterojunctions for dye degradation. The migration of photo-induced electrons from g-C3N4 to the Al site of SAPO-5 should promote the photo-induced electron-hole pairs separation rate of g-C3N4 efficiently. Furthermore, the redox reactions for RhB degradation occur on the photo-induced holes in the g-C3N4 and Al sites in SAPO-5, respectively. This achievement not only improves the photocatalytic activity of g-C3N4 efficiently, but also broadens the application of SAPOs in the photocatalytic field.

scholarly journals Hybrid ZnO/MoS2 Core/Sheath Heterostructures for Photoelectrochemical Water Splitting

Applied Nano ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 148-161
Author(s):  
Katerina Govatsi ◽  
Aspasia Antonelou ◽  
Labrini Sygellou ◽  
Stylianos G. Neophytides ◽  
Spyros N. Yannopoulos
Keyword(s):  
Visible Light ◽  
Wide Band ◽  
Nanowire Arrays ◽  
Maximum Efficiency ◽  
Light Illumination ◽  
Wide Band Gap ◽  
Long Term Stability ◽  
Visible Light Illumination ◽  
Nanowire Surface ◽  
Wide Range

The rational synthesis of semiconducting materials with enhanced photoelectrocatalytic efficiency under visible light illumination is a long-standing issue. ZnO has been systematically explored in this field, as it offers the feasibility to grow a wide range of nanocrystal morphology; however, its wide band gap precludes visible light absorption. We report on a novel method for the controlled growth of semiconductor heterostructures and, in particular, core/sheath ZnO/MoS2 nanowire arrays and the evaluation of their photoelectrochemical efficiency in oxygen evolution reaction. ZnO nanowire arrays, with a narrow distribution of nanowire diameters, were grown on FTO substrates by chemical bath deposition. Layers of Mo metal at various thicknesses were sputtered on the nanowire surface, and the Mo layers were sulfurized at low temperature, providing in a controlled way few layers of MoS2, in the range from one to three monolayers. The heterostructures were characterized by electron microscopy (SEM, TEM) and spectroscopy (XPS, Raman, PL). The photoelectrochemical properties of the heterostructures were found to depend on the thickness of the pre-deposited Mo film, exhibiting maximum efficiency for moderate values of Mo film thickness. Long-term stability, in relation to similar heterostructures in the literature, has been observed.

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