Synthesis of nanosized nitrogen-containing MOx–ZnO (M = W, V, Fe) composite powders by spray pyrolysis and their visible-light-driven photocatalysis in gas-phase acetaldehyde decomposition

2004 ◽  
Vol 93-95 ◽  
pp. 895-901 ◽  
Author(s):  
Di Li ◽  
Hajime Haneda ◽  
Naoki Ohashi ◽  
Shunichi Hishita ◽  
Yukio Yoshikawa
Keyword(s):  
Visible Light ◽  
Spray Pyrolysis ◽  
Gas Phase ◽  
Composite Powders ◽  
Visible Light Driven

Photocatalytic oxidation of gas-phase Hg0 by carbon spheres supported visible-light-driven CuO–TiO2

2017 ◽  
Vol 46 ◽  
pp. 416-425 ◽  
Author(s):  
Jiang Wu ◽  
Chaoen Li ◽  
Xiantuo Chen ◽  
Jing Zhang ◽  
Lili Zhao ◽  
...  
Keyword(s):  
Visible Light ◽  
Gas Phase ◽  
Photocatalytic Oxidation ◽  
Carbon Spheres ◽  
Visible Light Driven

scholarly journals Water-Stable Boron-Doped Boron Nitride Photocatalyst for Visible Light-Driven H2 Evolution and CO2 Photoreduction

2020 ◽  
Author(s):  
Ravi Shankar ◽  
Daphne Lubert-Perquel ◽  
Elan Mistry ◽  
Irena Nevjestić ◽  
Sandrine Heutz ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Visible Light ◽  
Gas Phase ◽  
Hyperfine Interactions ◽  
Quantum Yields ◽  
H2 Evolution ◽  
Co2 Photoreduction ◽  
Boron Doped ◽  
Out Of Plane ◽  
Visible Light Driven

<p>Developing robust, multifunctional photocatalysts that can facilitate both hydrogen evolution via photoreforming of water and gas phase CO2 photoreduction is highly desirable with the long-term vision of integrated photocatalytic setups. Here, we present a new addition to the boron nitride (BN) photocatalyst material platform, boron-doped boron oxynitride (B-BNO), capable of fulfilling this goal. Detailed EPR studies revealed hyperfine interactions between free charges located on discrete OB3 sites, exhibiting an out-of-plane symmetry, and the nuclei of neighbouring boron atoms. This material resolves two long-standing bottlenecks associated to BN-based materials concomitantly: instability in water and lack of photo activity under visible light. We show that B-BNO maintains prolonged stability in water for at least three straight days and can facilitate both liquid phase H2 evolution and gas phase CO2 photoreduction, using UV-Vis and deep visible irradiation (λ > 550 nm), without any cocatalysts. The evolution rates, apparent quantum yields, and selectivities observed for both reactions with B-BNO exceed those of its porous BNO counterpart, P25 TiO2 and bulk g-C3N4. This work provides scope to expand the BN photocatalyst platform to a wider range of reactions.</p>

Boron-Doped Boron Nitride Photocatalyst for Visible Light-Driven H2 Evolution and CO2 Photoreduction

2020 ◽  
Author(s):  
Ravi Shankar ◽  
Daphne Lubert-Perquel ◽  
Elan Mistry ◽  
Irena Nevjestić ◽  
Sandrine Heutz ◽  
...  
Keyword(s):  
Visible Light ◽  
Gas Phase ◽  
Hyperfine Interactions ◽  
Free Oxygen Radicals ◽  
Co Catalysts ◽  
Boron Doped ◽  
The Family ◽  
Visible Light Driven ◽  
Band Gap Narrowing

<p>Developing robust, multifunctional photocatalysts that can facilitate both hydrogen evolution <i>via</i> photoreforming of water and gas phase CO<sub>2</sub> photoreduction is highly desirable with the long-term vision of integrated photocatalytic setups. Here, we present a step-change in the family of boron oxynitride materials by introducing the first example of a B-doped boron oxynitride (B-BNO). This material resolves an on-going bottleneck associated with BN-based materials, i.e. the lack of photoactivity under visible light. Detailed EPR studies revealed distinct hyperfine interactions between the free oxygen radicals and 3 neighbouring boron nuclei. This confirmed isolated OB<sub>3 </sub>sites, which contribute to band gap narrowing, as the radical species and origin of paramagnetism in BNO materials. We show that B-BNO can facilitate both liquid phase H<sub>2 </sub>evolution and gas phase CO<sub>2</sub> photoreduction, using UV-Vis and deep visible irradiation (λ > 550 nm), without any co-catalysts. The evolution rates, quantum efficiencies, and selectivities observed for both reactions with B-BNO exceed those of its porous BNO counterpart, P25 TiO<sub>2</sub> and bulk g-C<sub>3</sub>N<sub>4</sub>.</p>

Visible-Light-Driven N−F−Codoped TiO2Photocatalysts. 1. Synthesis by Spray Pyrolysis and Surface Characterization

2005 ◽  
Vol 17 (10) ◽  
pp. 2588-2595 ◽  
Author(s):  
Di Li ◽  
Hajime Haneda ◽  
Shunichi Hishita ◽  
Naoki Ohashi
Keyword(s):  
Visible Light ◽  
Spray Pyrolysis ◽  
Surface Characterization ◽  
Visible Light Driven

Asymmetric zinc porphyrin-sensitized nanosized TiO2 for efficient visible-light-driven CO2 photoreduction to CO/CH4

2015 ◽  
Vol 51 (62) ◽  
pp. 12443-12446 ◽  
Author(s):  
Kan Li ◽  
Li Lin ◽  
Tianyou Peng ◽  
Yingying Guo ◽  
Renjie Li ◽  
...  
Keyword(s):  
Visible Light ◽  
Gas Phase ◽  
Co2 Photoreduction ◽  
Zinc Porphyrin ◽  
Visible Light Driven ◽  
Nanosized Tio2

Asymmetric zinc porphyrin was used as a novel sensitizer for the visible-light-driven activity of CO2 photoreduction to CO/CH4 in the gas phase.

Hydrothermal Synthesis and Visible-Light-Driven Photocatalytic Activity of Allophane – Wakefieldite-(Ce) Composite

2014 ◽  
Vol 896 ◽  
pp. 545-548
Author(s):  
Mirabbos Hojamberdiev ◽  
Yuki Makinose ◽  
Kenichi Katsumata ◽  
Toshihiro Isobe ◽  
Nobuhiro Matsushita ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Hydrothermal Synthesis ◽  
Visible Light ◽  
Gas Phase ◽  
X Ray Diffraction ◽  
Mechanical Mixing ◽  
X Ray ◽  
Surface Areas ◽  
Visible Light Driven ◽  
Gas Molecules

In this study, highly adsorptive mechanically-mixed and as-synthesized allophane–wakefieldite-(Ce) composites were prepared by mechanical mixing and hydrothermal synthesis, respectively. The results from X-ray diffraction and Raman spectroscopy analyses show that the mechanically-mixed composite has higher crystallinity than the as-synthesized composite. The nanoparticles of wakefieldite-(Ce) were homogenously distributed with allophane in the as-synthesized composite. The specific surface areas of the mechanically-mixed and as-synthesized composites are 164 m2/g and 191 m2/g, respectively. The photocatalytic activity of the samples was evaluated for the degradation of acetaldehyde (AcH) gas under visible light. Both composites demonstrated higher photocatalytic activity than individual wakefieldite-(Ce) and allophane because allophane in the composites played an important role in the adsorption of acetaldehyde gas molecules and the mediation between the gas phase and the wakefieldite-(Ce) surface.

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