Direct imaging of visible-light-induced one-step charge separation at the chromium(III) oxide–strontium titanate interface

2021 ◽  
Author(s):  
Aufandra Cakra Wardhana ◽  
Sou Yasuhara ◽  
Min Wen Yu ◽  
Akira Yamaguchi ◽  
Tadaaki Nagao ◽  
...  
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Strontium Titanate ◽  
Charge Separation ◽  
Light Illumination ◽  
Practical Applications ◽  
Visible Light Illumination ◽  
Visible Light Active ◽  
One Step ◽  
Photocatalytic Reactions

Efficient visible-light-active photocatalysts are of great interest for practical applications. First-row transition metal oxide nanoclusters have been loaded onto ultraviolet (UV)-driven semiconductors for several photocatalytic reactions under visible-light illumination. However,...

SrTaO2N co-doped with La/Zr as promising photocatalysts for water reduction under visible light illumination

2020 ◽  
Vol 7 (12) ◽  
pp. 2343-2351
Author(s):  
Ran Wang ◽  
Guoan Lin ◽  
Xiaoxiang Xu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Charge Separation ◽  
Light Illumination ◽  
Visible Light Absorption ◽  
Water Reduction ◽  
Co Doping ◽  
Visible Light Illumination ◽  
Co Doped ◽  
Separation Conditions

La/Zr co-doping preserves visible light absorption of SrTaO2N, prohibits the formation of defects, improves surface hydrophilicity and charge separation conditions, all of which contribute to an enhanced photocatalytic activity for water reduction.

Enhanced Ciprofloxacin Degradation Over Pt@BaZrO3/g-C3N4 Heterojunctions Beneath Visible Light Illumination

2020 ◽  
Vol 12 (7) ◽  
pp. 874-884
Author(s):  
Maha Alhaddad
Keyword(s):  
Visible Light ◽  
Charge Separation ◽  
Photocatalytic Performance ◽  
Charge Carriers ◽  
Superior Performance ◽  
Photocatalytic Decomposition ◽  
Light Illumination ◽  
Great Ability ◽  
Visible Light Illumination ◽  
Essential Parameter

In this investigation, various proportions of Pt@BaZrO3 (at 1∼4 wt.%) accommodating 2.0 wt% Pt were adopted to establish Pt@BaZrO3/g-C3N4 nanocomposites of improved photocatalytic performance. H2PtCl6 nanoparticles as well as mesoporous BaZrO3 and g-C3N4 were utilized to develop the prescribed nanocomposites via sonication-mixture routine. The photocatalytic achievement for the upgraded Pt@BaZrO3/g-C3N4 nanocomposites beneath visible light irradiation were tested by examining ciprofloxacin (CIP) degradation. Enhanced charge transfer and retarded charges’ recombination were established amid Pt, BaZrO3 NPs and g-C3N4 nanosheets in the developed heterojunctions. The proportion (wt.%) of Pt@BaZrO3 was found to be an essential parameter in governing the photocatalytic efficacy of the promoted Pt@BaZrO3/g-C3N4 nanocomposites. Moreover, complete photocatalytic decomposition of CIP was established over Pt@BaZrO3/g-C3N4 nanocomposite, accommodating 3 wt.% Pt@BaZrO3 NPs. Such superior performance was correlated to the great ability of the Pt@BaZrO3/g-C3N4 to absorb visible light in addition to the prolonged charge separation amid the photo-induced charge carriers.

Enhanced photocatalytic disinfection of microorganisms by transition-metal-ion-modification of nitrogen-doped titanium oxide

2010 ◽  
Vol 25 (1) ◽  
pp. 167-176 ◽  
Author(s):  
Qi Li ◽  
Pinggui Wu ◽  
Rongcai Xie ◽  
Jian Ku Shang
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Metal Ion ◽  
Photocatalytic Performance ◽  
Light Illumination ◽  
Transition Metal Ion ◽  
Nitrogen Doped ◽  
Carrier Recombination ◽  
Visible Light Illumination ◽  
Charge Carrier Recombination

In this article, palladium modification and silver modification were used as examples to demonstrate the disinfection effects on microorganisms in aqueous environment of photocatalytic transition-metal-ion-modified nitrogen-doped titanium oxide (TiON/M) materials. Transition metal ion modification was applied to TiON to take advantage of the coupling between transition metal ion addition and TiON semiconductor matrix under visible light illumination. The coupling promotes the separation of electron and hole pairs produced by photon excitation, thus it could reduce the intrinsic charge carrier recombination from anion-doping, which largely limits the photoactivity of TiON under visible light illumination. Large enhancements on the hydroxyl radical production and the photocatalytic disinfection efficiency on microorganisms under visible light illumination were observed for TiON with both palladium and silver modifications. The superior photocatalytic performance under visible light illumination suggests that the transition metal ion modification is an effective approach to reduce the massive charge carrier recombination from anion-doping and to enhance the photocatalytic performance of anion-doped TiO2. The resulting photocatalytic materials have the potential for a wide range of environmental applications.

scholarly journals High-Performance 3D Semiconductor-Based Heterostructure Photocatalyst in Sustained Control of Harmful Gas-Phase Pollutants Under Visible-Light Illumination

2021 ◽  
Author(s):  
Dong-Eun Lee ◽  
Mi Hyang Bae ◽  
Wan Jo
Keyword(s):  
Visible Light ◽  
Gas Phase ◽  
Charge Separation ◽  
High Performance ◽  
Three Dimensional ◽  
Reaction Chamber ◽  
Light Illumination ◽  
Highly Efficient ◽  
Visible Light Illumination ◽  
Catalyst Powder

Abstract Herein, a highly efficient three-dimensional (3D) semiconductor-based heterostructure photocatalyst (i.e., WO3–g-C3N4 monolithic architecture; WOCNM) was developed by immobilizing a WO3–g-C3N4 heterostructure powder on a melamine foam (MF) framework. Subsequently, the sustained control of two harmful model gas-phase pollutants (i.e., n-butanol and o-xylene) over WOCNM and selected monolithic counterparts (i.e., MF-supported WO3 monolith and MF-supported g-C3N4 monolith) was investigated under visible-light irradiation. WOCNM exhibited higher photocatalytic capabilities in the sustained control of the two model pollutants than those of individual WO3 and g-C3N4 monoliths because the WO3–g-C3N4 heterojunction enhanced its charge-separation ability. Notably, WOCNM exhibited highly efficient photocatalytic capabilities in the sustained control of n-butanol (up to 97%) and o-xylene (up to 86%). Moreover, no noticeable changes were observed in the WOCNM photocatalytic capability after the final run of successive applications. The fresh and successively used WOCNMs were nearly identical, and the photocatalyst powder was not observed in the reaction chamber after its successive application. As a result, WOCNM was a highly efficient and stable 3D heterostructure photocatalyst for the sustained control of gas-phase n-butanol and o-xylene, without significant catalyst powder loss. Promisingly, this study will expedite the future development of 3D photocatalysts for the sustained control of harmful gas-phase pollutants.

Efficient visible-light photocatalytic heterojunctions formed by coupling plasmonic Cu2−xSe and graphitic carbon nitride

2015 ◽  
Vol 39 (8) ◽  
pp. 6186-6192 ◽  
Author(s):  
Jing Han ◽  
Hong Yan Zou ◽  
Ze Xi Liu ◽  
Tong Yang ◽  
Ming Xuan Gao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Charge Separation ◽  
Carbon Nitride ◽  
Light Harvesting ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Light Illumination ◽  
Visible Light Illumination ◽  
Visible Light Photocatalytic

Heterojunctions formed by plasmonic Cu2−xSe nanocrystals and graphitic carbon nitride (g-C3N4) can improve the solar-light harvesting and charge separation/transfer with efficient photocatalytic activity under visible light illumination.

One step fabrication of novel Ag-CdS@EP floating photocatalyst for efficient degradation of organic pollutants under visible light illumination

2018 ◽  
Vol 47 (35) ◽  
pp. 12253-12263 ◽  
Author(s):  
Usman Ali Khan ◽  
Jianjun Liu ◽  
Jinbo Pan ◽  
Shengli Zuo ◽  
Hecheng Ma ◽  
...  
Keyword(s):  
Visible Light ◽  
Organic Pollutants ◽  
Ag Nanoparticles ◽  
Light Illumination ◽  
Expanded Perlite ◽  
Visible Light Illumination ◽  
One Step

In this paper, we present the fabrication of an expanded-perlite (EP)-based floating photocatalyst comprising CdS and Ag nanoparticles.

Durable visible light self-cleaning surfaces imparted by TiO2/SiO2/GO photocatalyst

2018 ◽  
Vol 89 (4) ◽  
pp. 517-527 ◽  
Author(s):  
Jing Gao ◽  
Wandi Li ◽  
Xinzhe Zhao ◽  
Lu Wang ◽  
Ning Pan
Keyword(s):  
Graphene Oxide ◽  
Visible Light ◽  
Gentian Violet ◽  
Light Illumination ◽  
Step Method ◽  
Stain Removal ◽  
Visible Light Illumination ◽  
Visible Light Driven ◽  
One Step ◽  
Self Cleaning

This research intends to enhance the photocatalytic efficiency and durability of substrates coated with TiO2-based nanocomposites under visible light illumination. More specifically, TiO2/SiO2/graphene oxide nanocomposites are successfully sono-synthesized and sono-fabricated onto a polymeric fabric through a facile one-step method. The morphologies, phase structures and optical properties of the samples are studied. The photocatalytic activity of the functionalized samples is assessed through a gentian violet stain removal test and then photodecomposition of methylene blue under visible light, and tested again after 10 washes to check on its durability. It is corroborated that TiO2/SiO2/graphene oxide nanocomposites have shown significantly better visible light self-cleaning performance than just using the pure TiO2 alone. In addition, even after 10 washes, the samples virtually maintain the functionality. Herein, sono-synthesis of TiO2/SiO2/graphene oxide represents a remarkable step forward in visible light-driven self-cleaning treatment for flexible materials and, hence, holds a great potential for commercialization.

Synthesis and evaluation of CoPc grafted bismuth oxyhalide (Bi24O31Br10): a visible light-active photocatalyst for CO2 reduction into methanol

2019 ◽  
Vol 48 (15) ◽  
pp. 4941-4948 ◽  
Author(s):  
Pankaj Kumar Prajapati ◽  
Suman L. Jain
Keyword(s):  
Visible Light ◽  
Co2 Reduction ◽  
Light Illumination ◽  
Visible Light Illumination ◽  
Visible Light Active ◽  
Bismuth Oxyhalide

The present study describes the synthesis, characterization, and evaluation of cobalt(ii) phthalocyanine embedded bismuth oxyhalide (CoPc@Bi24O31Br10) for the photoreduction of CO2 into methanol selectively using triethylamine (TEA) as a sacrificial donor under visible light illumination.

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