A facile synthesis of TiO2/BiOCl and TiO2/BiOCl/La2O3 heterostructure photocatalyst for enhanced charge separation efficiency with improved UV-light catalytic activity towards Rhodamine B and Reactive Yellow 86

2021 ◽  
pp. 108715
Author(s):  
A. Sridevi ◽  
B.R. Ramji ◽  
G.K.D Prasanna Venkatesan ◽  
V. Sugumaran ◽  
P. Selvakumar
Keyword(s):  
Catalytic Activity ◽  
Rhodamine B ◽  
Charge Separation ◽  
Separation Efficiency ◽  
Uv Light ◽  
Facile Synthesis ◽  
Charge Separation Efficiency

scholarly journals Detailed Spectroscopic and Structural Analysis of TiO2/WO3 Composite Semiconductors

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Biborka Boga ◽  
István Székely ◽  
Zsolt Pap ◽  
Lucian Baia ◽  
Monica Baia
Keyword(s):  
Charge Separation ◽  
Separation Efficiency ◽  
Uv Light ◽  
Band Gap Energy ◽  
Crucial Importance ◽  
Gap Energy ◽  
Spectroscopic Characteristics ◽  
Charge Separation Efficiency ◽  
Derived Data

WO3-TiO2 composite materials were obtained using commercial titania (Evonik Aeroxide P25) and hydrothermally crystallized WO3. Different ratios of TiO2/WO3 were investigated, starting at 1 wt.% of WO3 to 50 wt.%. The morphology of WO3 was of the star-like type, and its structure is basically composed of monoclinic crystalline phase. All spectroscopic characteristics of the composites and their derived data (band-gap energy value, light absorption threshold, and IR specific bands) directly varied with the increase of the WO3 content. However, the oxalic acid photodegradation achieved under UV light reached the highest yield for 24 wt.% WO3 content, a result that was attributed to the charge separation efficiency and the surface hydrophilicity. The latter mentioned reason points out the crucial importance of the surface quality of the investigated structure in photocatalytic tests.

scholarly journals MXene-Ti3C2 assisted one-step synthesis of carbon-supported TiO2/Bi4NbO8Cl heterostructures for enhanced photocatalytic water decontamination

Nanophotonics ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 2077-2088 ◽  
Author(s):  
Daixun Jiang ◽  
Xun Sun ◽  
Xilu Wu ◽  
Shuai Zhang ◽  
Xiaofei Qu ◽  
...  
Keyword(s):  
Charge Separation ◽  
Photocatalytic Performance ◽  
Separation Efficiency ◽  
Salt Flux ◽  
The Novel ◽  
Water Contaminants ◽  
Photocatalytic Removal ◽  
One Step ◽  
Charge Separation Efficiency ◽  
Perovskite Type

AbstractThe strategy to improve the photocatalytic removal efficiencies towards organic pollutants is still a challenge for the novel Sillen–Aurivillius perovskite type Bi4NbO8Cl. Herein, we report carbon-supported TiO2/Bi4NbO8Cl (C-TiO2/Bi4NbO8Cl) heterostructures with enhanced charge separation efficiency, which were fabricated via molten-salt flux process. The carbon-supported TiO2 particles were derived from MXene Ti3C2 precursors, and attached on plate-like Bi4NbO8Cl, acting as electron-traps to achieve supressed recombination of photo-induced charges. The improved charge separation confers C-TiO2/Bi4NbO8Cl heterostructures superior photocatalytic performance with 53% higher than pristine Bi4NbO8Cl, towards rhodamine B removal with the help of photo-induced holes. Moreover, the C-TiO2/Bi4NbO8Cl heterostructures can be expanded to deal with other water contaminants, such as methyl orange, ciprofloxacin and 2,4-dichlorophenol with 44, 25 and 13% promotion, respectively, and thus the study offers a series of efficient photocatalysts for water purification.

scholarly journals Self-template synthesis of ATiO3 (A = Ba, Pb and Sr) perovskites for photocatalytic removal of NO

RSC Advances ◽  
2017 ◽  
Vol 7 (44) ◽  
pp. 27397-27404 ◽  
Author(s):  
Shiyi Cai ◽  
Shan Yu ◽  
Wenchao Wan ◽  
Wen Wen ◽  
Ying Zhou
Keyword(s):  
Template Synthesis ◽  
Charge Separation ◽  
Separation Efficiency ◽  
Light Response ◽  
Photocatalytic Removal ◽  
Charge Separation Efficiency

ATiO3 were synthesized from TiO2 nanosheets dominated with {001} facets, PbTiO3 possesses the highest activity as a result of larger light response and higher charge separation efficiency.

scholarly journals Impact of Nanoparticle Consolidation on Charge Separation Efficiency in Anatase TiO2 Films

2021 ◽  
Vol 9 ◽  
Author(s):  
Karin Rettenmaier ◽  
Thomas Berger
Keyword(s):  
Thermal Annealing ◽  
Charge Separation ◽  
Separation Efficiency ◽  
Internal Surface ◽  
Processing Temperature ◽  
Cyclic Voltammograms ◽  
Internal Surface Area ◽  
Deep Traps ◽  
Charge Separation Efficiency ◽  
The Impact

Mesoporous films and electrodes were prepared from aqueous slurries of isolated anatase TiO2 nanoparticles. The resulting layers were annealed in air at temperatures 100°C ≤ T ≤ 450°C upon preservation of internal surface area, crystallite size and particle size. The impact of processing temperature on charge separation efficiency in nanoparticle electrodes was tracked via photocurrent measurements in the presence of methanol as a hole acceptor. Thermal annealing leads to an increase of the saturated photocurrent and thus of the charge separation efficiency at positive potentials. Furthermore, a shift of capacitive peaks in the cyclic voltammograms of the nanoparticle electrodes points to the modification of the energy of deep traps. Population of these traps triggers recombination possibly due to the action of local electrostatic fields attracting photogenerated holes. Consequently, photocurrents saturate at potentials, at which deep traps are mostly depopulated. Charge separation efficiency was furthermore investigated for nanoparticle films and was tracked via the decomposition of hydrogen peroxide. Our observations evidence an increase of charge separation efficiency upon thermal annealing. The effect of particle consolidation, which we associate with minute atomic rearrangements at particle/particle contacts, is attributed to the energetic modification of deep traps and corresponding modifications of charge transport and recombination, respectively.

A g-C3N4/nanocarbon/ZnIn2S4nanocomposite: an artificial Z-scheme visible-light photocatalytic system using nanocarbon as the electron mediator

2015 ◽  
Vol 51 (96) ◽  
pp. 17144-17147 ◽  
Author(s):  
Fenfen Shi ◽  
Linlin Chen ◽  
Min Chen ◽  
Deli Jiang
Keyword(s):  
Visible Light ◽  
Charge Separation ◽  
Separation Efficiency ◽  
Electron Mediator ◽  
Photocatalytic System ◽  
Charge Separation Efficiency ◽  
Visible Light Photocatalytic

Nanocarbon could be used as an electron mediator to construct a Z-scheme photocatalytic system with enhanced charge separation efficiency.

scholarly journals Insights into a rutile/brookite homojunction of titanium dioxide: separated reactive sites and boosted photocatalytic activity

RSC Advances ◽  
2019 ◽  
Vol 9 (63) ◽  
pp. 36615-36620 ◽  
Author(s):  
Jing Chen ◽  
Meili Guan ◽  
Xuan Zhang ◽  
Xuezhong Gong
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Charge Separation ◽  
Redox Reactions ◽  
Separation Efficiency ◽  
Charge Separation Efficiency

Reactive sites for redox reactions were spatially separated using a rutile/brookite homojunction, thus contributing to improved charge separation efficiency.

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