Organically modified titania having a metal catalyst: a new type of liquid-phase hydrogen-transfer photocatalyst working under visible light irradiation and H2-free conditions

2016 ◽  
Vol 18 (24) ◽  
pp. 16076-16079 ◽  
Author(s):  
Hiroshi Kominami ◽  
Shin-ya Kitagawa ◽  
Yuki Okubo ◽  
Makoto Fukui ◽  
Keiji Hashimoto ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Hydrogen Transfer ◽  
Light Irradiation ◽  
Metal Catalyst ◽  
Organically Modified ◽  
New Type ◽  
Palladium Metal

2,3-Dihydroxynaphthalene-modified titania having palladium metal successfully worked as a hydrogen-transfer photocatalyst under visible light irradiation and hydrogen-free conditions.

scholarly journals Exfoliation of graphite into graphene in aqueous solution: an application as graphene/TiO2 nanocomposite to improve visible light photocatalytic activity

RSC Advances ◽  
2016 ◽  
Vol 6 (95) ◽  
pp. 93048-93055 ◽  
Author(s):  
R. Giovannetti ◽  
E. Rommozzi ◽  
M. Zannotti ◽  
C. A. D'Amato ◽  
S. Ferraro ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Liquid Phase ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Visible Light Photocatalytic Activity ◽  
Positive Effects ◽  
Graphene Dispersion ◽  
Visible Light Photocatalytic

Graphene dispersion (GR) was prepared by liquid-phase sonication of graphite and evaluated by XRD, DLS and UV-Vis analysis. It was used to prepare PP@mgGR–TiO2, showing positive effects on ARS photodegradation under visible light irradiation.

Visible light-induced heterogeneous Meerwein–Ponndorf–Verley-type reduction of an aldehyde group over an organically modified titanium dioxide photocatalyst

2017 ◽  
Vol 53 (30) ◽  
pp. 4215-4218 ◽  
Author(s):  
Makoto Fukui ◽  
Atsuhiro Tanaka ◽  
Keiji Hashimoto ◽  
Hiroshi Kominami
Keyword(s):  
Titanium Dioxide ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Aldehyde Group ◽  
Light Irradiation ◽  
Benzyl Alcohols ◽  
Type Reduction ◽  
Organically Modified ◽  
Titanium Dioxide Photocatalyst

An organically modified TiO2 photocatalyst chemoselectively converted benzaldehydes to the corresponding benzyl alcohols under visible light irradiation.

scholarly journals Superior photocatalytic performance of LaFeO3/g-C3N4 heterojunction nanocomposites under visible light irradiation

RSC Advances ◽  
2017 ◽  
Vol 7 (72) ◽  
pp. 45369-45376 ◽  
Author(s):  
Ke Xu ◽  
Jian Feng
Keyword(s):  
Visible Light ◽  
Hydrogen Evolution ◽  
Visible Light Irradiation ◽  
Photocatalytic Performance ◽  
Light Irradiation ◽  
Photocatalytic Hydrogen Evolution ◽  
New Type

New type of Z-scheme LaFeO3/g-C3N4 heterostructures were successfully prepared and the enhanced photocatalytic hydrogen evolution and degradation activities are presented.

Hydrogen- and noble metal-free conversion of nitro aromatics to amino aromatics having reducible groups over an organically modified TiO2 photocatalyst under visible light irradiation

2019 ◽  
Vol 9 (4) ◽  
pp. 966-973 ◽  
Author(s):  
Yuhei Yamamoto ◽  
Makoto Fukui ◽  
Atsuhiro Tanaka ◽  
Keiji Hashimoto ◽  
Hiroshi Kominami
Keyword(s):  
Visible Light ◽  
Noble Metal ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Tio2 Photocatalyst ◽  
Metal Free ◽  
Organically Modified ◽  
Hole Scavenger ◽  
Nitro Aromatics

A TiO2 modified with 2,3-dihydroxynaphthalene responds to visible light, and electrons are photogenerated to the CB of TiO2 under light irradiation in the presence of a suitable hole scavenger.

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.

Sign in / Sign up

Export Citation Format

Share Document