Rational construction of 1D/2D Cu-NiS/S-g-C3N4 binary nanocomposites heterojunction enriching spatial charge carrier separation under visible light irradiation

2022 ◽  
Vol 141 ◽  
pp. 106448
Author(s):  
Othman Hakami
Keyword(s):  
Charge Carrier ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Spatial Charge ◽  
Carrier Separation ◽  
Rational Construction

A tetraphenylporphyrin/WO3/exfoliated graphite nanocomposite for the photocatalytic degradation of an acid dye under visible light irradiation

2019 ◽  
Vol 43 (28) ◽  
pp. 11348-11362 ◽  
Author(s):  
Mope Edwin Malefane ◽  
Usisipho Feleni ◽  
Alex Tawanda Kuvarega
Keyword(s):  
Charge Carrier ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Exfoliated Graphite ◽  
Acid Dye ◽  
Carrier Separation ◽  
Visible Light Photocatalytic

Charge carrier separation in visible light photocatalytic degradation of a dye was achieved by the fabrication of a tetraphenylporphyrin/WO3/exfoliated graphite nanocomposite.

scholarly journals Synthesis, Characterization, and Photocatalytic Activity of g-C3N4/KTaO3Composites under Visible Light Irradiation

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Zhiqing Yong ◽  
Jian Ren ◽  
Huilin Hu ◽  
Peng Li ◽  
Shuxin Ouyang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Active Species ◽  
Light Irradiation ◽  
Ultrasonic Dispersion ◽  
Photogenerated Charge Carrier ◽  
Composite Photocatalysts ◽  
Separation Capacity ◽  
Carrier Separation

Novel graphitic carbon nitride/KTaO3(g-C3N4/KTaO3) nanocomposite photocatalysts have been successfully synthesized via a facile and simple ultrasonic dispersion method. Compared to either g-C3N4or KTaO3, the composite photocatalysts show significantly increased photocatalytic activity for degradation of Rhodamine B (RhB) under visible light irradiation. The increased photocatalytic performance of the composite could be attributed to the enhanced photogenerated charge carrier separation capacity. Moreover, it is observed that∙O2-is the main active species in the photocatalytic degradation of RhB using the g-C3N4/KTaO3composite photocatalysts.

Copper-Graphene-TiO2 Hybrid Materials for Photocatalytically Assisted H2 Generation

2020 ◽  
Author(s):  
David Maria Tobaldi ◽  
Kamila Koci ◽  
Miroslava Edelmannova ◽  
Luc Lajaunie ◽  
Bruno Figueiredo ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Charge Carrier ◽  
Visible Light ◽  
Water Splitting ◽  
Hydrogen Generation ◽  
Fold Increase ◽  
Photocatalytic Water Splitting ◽  
Photocatalytic Hydrogen Generation ◽  
Spatial Charge ◽  
Carrier Separation

<p>Hydrogen, as energy carrier, is a zero-emission fuel. Being green and clean, it is considered to play an important role in energy and environmental issues. Photocatalytic water splitting is a process used to generate hydrogen from the dissociation of water. Titanium dioxide is still the archetype material for photocatalytic water splitting. However, because of the fast recombination of the photo-generated exciton, the yield of the reaction is typically low. In this work, we have modified the surface of titanium dioxide with copper and copper/graphene to sensitise it to visible light, and to increase the spatial charge carrier separation, thus extending the quantum yield of H<sub>2</sub> production from methanol/water mixtures. Results showed that, in the analysed system, exists an optimum amount of copper plus graphene (<i>i.e.</i> 0.5 mol% copper plus 0.5 wt% graphene) to grant a two-fold increase in the photocatalytic hydrogen generation compared to that of bare titania. That system proved itself to be complex and dynamic. This was attributed to the increased spatial charge carrier separation exploited by graphene (under 365 and 405 nm irradiation), and to the continuous reduction of Cu(II) to Cu(I) due to IFCT that has proven to be an excellent visible-light sensitiser in the copper/graphene-titania system.</p><p>Hybrid titania-copper-graphene materials could therefore be exploited in the field of light-to-energy applications.</p>

Double charge carrier mechanism through 2D/2D interface-assisted ultrafast water reduction and antibiotic degradation over architectural S,P co-doped g-C3N4/ZnCr LDH photocatalyst

2020 ◽  
Vol 7 (19) ◽  
pp. 3695-3717 ◽  
Author(s):  
Dipti Prava Sahoo ◽  
Kundan Kumar Das ◽  
Sulagna Patnaik ◽  
Kulamani Parida
Keyword(s):  
Charge Carrier ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Water Reduction ◽  
Carrier Mechanism ◽  
Double Charge ◽  
Antibiotic Degradation ◽  
Co Doped

S,P co-doped g-C3N4/ZnCr LDH 2D/2D heterostructure for photocatalytic ciprofloxacin degradation and H2 evolution under the visible light irradiation.

Copper-Graphene-TiO2 Hybrid Materials for Photocatalytically Assisted H2 Generation

2020 ◽  
Author(s):  
David Maria Tobaldi ◽  
Kamila Koci ◽  
Miroslava Edelmannova ◽  
Luc Lajaunie ◽  
Bruno Figueiredo ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Charge Carrier ◽  
Visible Light ◽  
Water Splitting ◽  
Hydrogen Generation ◽  
Fold Increase ◽  
Photocatalytic Water Splitting ◽  
Photocatalytic Hydrogen Generation ◽  
Spatial Charge ◽  
Carrier Separation

<p>Hydrogen, as energy carrier, is a zero-emission fuel. Being green and clean, it is considered to play an important role in energy and environmental issues. Photocatalytic water splitting is a process used to generate hydrogen from the dissociation of water. Titanium dioxide is still the archetype material for photocatalytic water splitting. However, because of the fast recombination of the photo-generated exciton, the yield of the reaction is typically low. In this work, we have modified the surface of titanium dioxide with copper and copper/graphene to sensitise it to visible light, and to increase the spatial charge carrier separation, thus extending the quantum yield of H<sub>2</sub> production from methanol/water mixtures. Results showed that, in the analysed system, exists an optimum amount of copper plus graphene (<i>i.e.</i> 0.5 mol% copper plus 0.5 wt% graphene) to grant a two-fold increase in the photocatalytic hydrogen generation compared to that of bare titania. That system proved itself to be complex and dynamic. This was attributed to the increased spatial charge carrier separation exploited by graphene (under 365 and 405 nm irradiation), and to the continuous reduction of Cu(II) to Cu(I) due to IFCT that has proven to be an excellent visible-light sensitiser in the copper/graphene-titania system.</p><p>Hybrid titania-copper-graphene materials could therefore be exploited in the field of light-to-energy applications.</p>

Cu Doped TiO2: Visible Light Assisted Photocatalytic Antimicrobial Activity and High Temperature Anatase Stability

2018 ◽  
Author(s):  
Snehamol Mathew ◽  
Priyanka Ganguly ◽  
Stephen Rhatigan ◽  
Vignesh Kumaravel ◽  
Ciara Byrne ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Density Functional ◽  
Anatase Phase ◽  
Sol Gel ◽  
Chemical Properties ◽  
Light Irradiation ◽  
Health Concern ◽  
Bacterial Inactivation ◽  
X Ray

Indoor surface contamination by microbes is a major public health concern. A damp environment is one potential sources for microbe proliferation. Smart photocatalytic coatings on building surfaces using semiconductors like titania (TiO<sub>2</sub>) can effectively curb this growing threat.<b> </b>Metal-doped titania in anatase phase has been proved as a promising candidate for energy and environmental applications. In this present work, the antimicrobial efficacy of copper (Cu) doped TiO<sub>2 </sub>(Cu-TiO<sub>2</sub>) was evaluated against <i>Escherichia coli</i> (Gram-negative) and <i>Staphylococcus aureus</i> (Gram-positive) under visible light irradiation. Doping of a minute fraction of Cu (0.5 mol %) in TiO<sub>2 </sub>was carried out <i>via</i> sol-gel technique. Cu-TiO<sub>2</sub> further calcined at various temperatures (in the range of 500 °C – 700 °C) to evaluate the thermal stability of TiO<sub>2</sub> anatase phase. The physico-chemical properties of the samples were characterised through X-ray diffraction (XRD), Raman spectroscopy, X-ray photo-electron spectroscopy (XPS) and UV-visible spectroscopy techniques. XRD results revealed that the anatase phase of TiO<sub>2</sub> was maintained well, up to 650 °C, by the Cu dopant. UV-DRS results suggested that the visible light absorption property of Cu-TiO<sub>2 </sub>was enhanced and the band gap is reduced to 2.8 eV. Density functional theory (DFT) studies emphasises the introduction of Cu<sup>+</sup> and Cu<sup>2+</sup> ions by replacing Ti<sup>4+</sup> ions in the TiO<sub>2</sub> lattice, creating oxygen vacancies. These further promoted the photocatalytic efficiency. A significantly high bacterial inactivation (99.9%) was attained in 30 mins of visible light irradiation by Cu-TiO<sub>2</sub>.

Semiconductor Photocatalysts for Solar-to-Hydrogen Energy Conversion: Recent Advances of CdS

2020 ◽  
Vol 16 ◽  
Author(s):  
Yuxue Wei ◽  
Honglin Qin ◽  
Jinxin Deng ◽  
Xiaomeng Cheng ◽  
Mengdie Cai ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Visible Light Irradiation ◽  
Noble Metals ◽  
Light Irradiation ◽  
Photocatalytic Hydrogen Evolution ◽  
Theoretical Design ◽  
Recent Developments

Introduction: Solar-driven photocatalytic hydrogen production from water splitting is one of the most promising solutions to satisfy the increasing demands of a rapidly developing society. CdS has emerged as a representative semiconductor photocatalyst due to its suitable band gap and band position. However, the poor stability and rapid charge recombination of CdS restrict its application for hydrogen production. The strategy of using a cocatalyst is typically recognized as an effective approach for improving the activity, stability, and selectivity of photocatalysts. In this review, recent developments in CdS cocatalysts for hydrogen production from water splitting under visible-light irradiation are summarized. In particular, the factors affecting the photocatalytic performance and new cocatalyst design, as well as the general classification of cocatalysts, are discussed, which includes a single cocatalyst containing noble-metal cocatalysts, non-noble metals, metal-complex cocatalysts, metal-free cocatalysts, and multi-cocatalysts. Finally, future opportunities and challenges with respect to the optimization and theoretical design of cocatalysts toward the CdS photocatalytic hydrogen evolution are described. Background: Photocatalytic hydrogen evolution from water splitting using photocatalyst semiconductors is one of the most promising solutions to satisfy the increasing demands of a rapidly developing society. CdS has emerged as a representative semiconductor photocatalyst due to its suitable band gap and band position. However, the poor stability and rapid charge recombination of CdS restrict its application for hydrogen production. The strategy of using a cocatalyst is typically recognized as an effective approach for improving the activity, stability, and selectivity of photocatalysts. Methods: This review summarizes the recent developments in CdS cocatalysts for hydrogen production from water splitting under visible-light irradiation. Results: Recent developments in CdS cocatalysts for hydrogen production from water splitting under visible-light irradiation are summarized. The factors affecting the photocatalytic performance and new cocatalyst design, as well as the general classification of cocatalysts, are discussed, which includes a single cocatalyst containing noble-metal cocatalysts, non-noble metals, metal-complex cocatalysts, metal-free cocatalysts, and multi-cocatalysts. Finally, future opportunities and challenges with respect to the optimization and theoretical design of cocatalysts toward the CdS photocatalytic hydrogen evolution are described. Conclusion: The state-of-the-art CdS for producing hydrogen from photocatalytic water splitting under visible light is discussed. The future opportunities and challenges with respect to the optimization and theoretical design of cocatalysts toward the CdS photocatalytic hydrogen evolution are also described.

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