scholarly journals Construction of full-spectrum-driven Ag–g-C3N4/W18O49 heterojunction catalyst with outstanding N2 photofixation ability

RSC Advances ◽  
2017 ◽  
Vol 7 (68) ◽  
pp. 42997-43004 ◽  
Author(s):  
Hongyu Liang ◽  
Jianzhong Li ◽  
Yanwen Tian
Keyword(s):  
Electron Hole ◽  
Full Spectrum ◽  
Separation Rate ◽  
Light Utilization

Ag–g-C3N4/W18O49 heterojunction catalysts display much higher N2 photofixation performance than that of individual W18O49 or Ag–g-C3N4, which is due to the better separation rate of electron–hole pairs and more efficient light utilization.

scholarly journals Preparation and photocatalytic performance of metallic Nb0.9Ta0.1S2/2D-C3N4 composite

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Hanxiang Chen ◽  
Jianjian Yi ◽  
Zhao Mo ◽  
Yanhua Song ◽  
Wenshu Yang ◽  
...  
Keyword(s):  
Separation Efficiency ◽  
Low Cost ◽  
Metal Sulfide ◽  
Electron Hole ◽  
Practical Applications ◽  
Energy And Environment ◽  
Photocatalytic Application ◽  
Light Utilization ◽  
Ternary Metal ◽  
Key Issues

Abstract Photocatalysis technology has potential application in the field of energy and environment. How to expand visible light utilization and promote the separation efficiency of the carriers are the key issues for the high active photocatalysts preparation and future practical applications. In this work, a ternary metal sulfide Nb0.9Ta0.1S2 was prepared and used as an electron collector in the photocatalytic application. As a result, the generated electrons are quickly transferred to the surface of the composite to participate in the reaction. It was demonstrated that the photocatalytic activity of 2D-C3N4 was enhanced after the modification of Nb0.9Ta0.1S2. The Nb0.9Ta0.1S2/2D-C3N4 composite material was synthesized by solvothermal method. The composition of 5% Nb0.9Ta0.1S2/2D-C3N4 showed the highest H2 evolution rate of 1961.6 μmolg−1h−1, which was 6.6 times that of 2D-C3N4. The 15% Nb0.9Ta0.1S2/2D-C3N4 exhibited the best activity in Rhodamine B degradation rate of 97% in 2 h, which is 50% higher than that of 2D-C3N4. Nb0.9Ta0.1S2/2D-C3N4 can be used as electron trap to promote the effective separation of electron–hole pairs. This work provides benchmarks in exploring low-cost and efficient cocatalyst.

Designed synthesis of a p-Ag2S/n-PDI self-assembled supramolecular heterojunction for enhanced full-spectrum photocatalytic activity

2019 ◽  
Vol 7 (11) ◽  
pp. 6482-6490 ◽  
Author(s):  
Jun Yang ◽  
Hong Miao ◽  
Wenlu Li ◽  
Huiquan Li ◽  
Yongfa Zhu
Keyword(s):  
Photocatalytic Activity ◽  
Electron Hole ◽  
Full Spectrum ◽  
Effective Separation ◽  
Excellent Activity ◽  
Self Assembled ◽  
Designed Synthesis

An efficient full-spectrum responsive p-Ag2S/n-PDI heterojunction was successfully constructed. The excellent activity was mainly attributed to the more effective separation of electron-hole pairs.

scholarly journals Advances in layered double hydroxide-based ternary nanocomposites for photocatalysis of contaminants in water

2020 ◽  
Vol 9 (1) ◽  
pp. 1381-1396
Author(s):  
Hao Sun ◽  
Young-Jung Heo ◽  
Ji-Hye Park ◽  
Kyong Yop Rhee ◽  
Soo-Jin Park
Keyword(s):  
Layered Double Hydroxide ◽  
Heavy Metal Ions ◽  
Photocatalytic Performance ◽  
Low Cost ◽  
Aqueous Media ◽  
Energy Crisis ◽  
Electron Hole ◽  
Light Utilization ◽  
Double Hydroxide ◽  
Photocatalytic Applications

Abstract Recently, photocatalysis technology has been widely considered as an effective method for solving environmental pollution issues and addressing the energy crisis. Hybrids of layered double hydroxide (LDH) exhibit excellent photocatalytic properties for use in the field of wastewater treatment due to the large interlayer spaces, chemical stability, and low cost. However, pristine LDH suffers from numerous limitations, such as insufficient visible light utilization and a high recombination rate of electron–hole pairs, resulting in degradation of photocatalytic performance. Recent advancements have demonstrated that LDH-based hybrids are suitable nanocomposites for photocatalytic applications when combining LDH with other semiconductors. This article summarizes the progress in the field of LDH-based ternary composites with emphasis on the removal of organic pollutants and heavy metal ions from aqueous media. Moreover, the applications and synthesis of LDH-based ternary composites, including corresponding examples, are discussed. In addition, the interaction mechanisms between photocatalysts and contaminants in water are comprehensively explained. Finally, the review provides insights into the challenges and prospects for the advancement of LDH-based photocatalysts.

Preparation of the W18O49/g-C3N4 heterojunction catalyst with full-spectrum-driven photocatalytic N2 photofixation ability from the UV to near infrared region

2017 ◽  
Vol 41 (17) ◽  
pp. 8920-8926 ◽  
Author(s):  
Hongyu Liang ◽  
He Zou ◽  
Shaozheng Hu
Keyword(s):  
Quantum Efficiency ◽  
Near Infrared ◽  
Infrared Region ◽  
Infrared Light ◽  
Full Spectrum ◽  
Near Infrared Light ◽  
Light Utilization ◽  
Near Infrared Region

This work provides a strategy to improve the quantum efficiency of photocatalysts by promoting near-infrared light utilization.

Preparation of phenyl group functionalized g-C3N4 nanosheets with extended electron delocalization for enhanced visible-light photocatalytic activity

2018 ◽  
Vol 42 (9) ◽  
pp. 6756-6762 ◽  
Author(s):  
Yunfeng Li ◽  
Renxi Jin ◽  
Gaijuan Li ◽  
Xianchun Liu ◽  
Min Yu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Catalytic Activity ◽  
Visible Light ◽  
Phenyl Group ◽  
Electron Delocalization ◽  
Conjugation System ◽  
Visible Light Photocatalytic Activity ◽  
Separation Rate ◽  
Light Utilization ◽  
Visible Light Photocatalytic

Phenyl group functionalized g-C3N4 shows an improved light utilization and charges separation rate due to extended conjugation system, leading to a superior catalytic activity in a variety of photocatalytic systems.

Properties and photocatalytic performance of polypyrrole and polythiophene modified g-C3N4 nanocomposites

RSC Advances ◽  
2015 ◽  
Vol 5 (40) ◽  
pp. 31947-31953 ◽  
Author(s):  
Shaozheng Hu ◽  
Lin Ma ◽  
Haoying Wang ◽  
Lei Zhang ◽  
Yanfeng Zhao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Performance ◽  
Electron Hole ◽  
Separation Rate

Polythiophene modified g-C3N4 exhibits a stronger interaction with g-C3N4 and higher electron–hole separation rate than that of polypyrrole, and thus shows better photocatalytic activity and stability.

Observed and Theoretical Spectra in the 10–100Å Interval

1988 ◽  
Vol 102 ◽  
pp. 259-261
Author(s):  
W.A. Brown ◽  
M.E. Bruner ◽  
L.W. Acton
Keyword(s):  
Sounding Rocket ◽  
Full Spectrum ◽  
X Ray

AbstractThe soft x-ray spectra recorded in two sounding rocket flights in 1982 and 1985 are compared with with predicted spectra. The poster presents the processed densitometer trace of the full spectrum together with the new spectrum from the 1985 experiment. This note compares the intensities of the lines with predictions.

Current Status of Solid-State X-Ray Systems

1985 ◽  
Vol 43 ◽  
pp. 158-161
Author(s):  
Martin Peckerar ◽  
Anastasios Tousimis
Keyword(s):  
Solid State ◽  
Electric Fields ◽  
Spectral Lines ◽  
Current Status ◽  
Mobile Charge ◽  
Electron Hole ◽  
X Ray ◽  
Sensing Systems ◽  
Transmission Electron ◽  
Electron Microscopes

Solid state x-ray sensing systems have been used for many years in conjunction with scanning and transmission electron microscopes. Such systems conveniently provide users with elemental area maps and quantitative chemical analyses of samples. Improvements on these tools are currently sought in the following areas: sensitivity at longer and shorter x-ray wavelengths and minimization of noise-broadening of spectral lines. In this paper, we review basic limitations and recent advances in each of these areas. Throughout the review, we emphasize the systems nature of the problem. That is. limitations exist not only in the sensor elements but also in the preamplifier/amplifier chain and in the interfaces between these components.Solid state x-ray sensors usually function by way of incident photons creating electron-hole pairs in semiconductor material. This radiation-produced mobile charge is swept into external circuitry by electric fields in the semiconductor bulk.

A correlation of CL emissions from Penrith sandstone with elemental distributions obtained by simultaneous SEM-CL and EDS analysis

1995 ◽  
Vol 53 ◽  
pp. 392-393
Author(s):  
Paul J. Wright
Keyword(s):  
Optical Microscope ◽  
Electron Gun ◽  
High Electron ◽  
Collection System ◽  
Electron Hole ◽  
Depositional Processes ◽  
Eds Analysis ◽  
Distribution Mapping ◽  
Backscattered Electron ◽  
Electron Imaging

Most industrial and academic geologists are familiar with the beautiful red and orange cathodoluminescence colours produced by carbonate minerals in an optical microscope with a cold cathode electron gun attached. The cement stratigraphies interpreted from colour photographs have been widely used to determine the post depositional processes which have modified sedimentary rock textures.However to study quartzose materials high electron densities and kV's are necessary to stimulate sufficient emission. A scanning electron microscope with an optical collection system and monochromator provides an adequate tool and gives the advantage of providing secondary and backscattered electron imaging as well as elemental analysis and distribution mapping via standard EDS/WDS facilities.It has been known that the incorporation of many elements modify the characteristics of the CL emissions from geological materials. They do this by taking up positions between the valence and conduction band thus providing sites to assist in the recombination of electron hole pairs.

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