scholarly journals Defective Black TiO2: Effects of Annealing Atmospheres and Urea Addition on the Properties and Photocatalytic Activities

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2648
Author(s):  
Xu Zhang ◽  
Min Cai ◽  
Naxin Cui ◽  
Guifa Chen ◽  
Guoyan Zou ◽  
...  
Keyword(s):  
Separation Efficiency ◽  
Inert Gases ◽  
Recombination Rates ◽  
Vacuum Atmosphere ◽  
Black Tio2 ◽  
One Step ◽  
Induced Charge ◽  
Transfer Properties ◽  
Oxidative Species ◽  
Urea Addition

A series of black TiO2 with and without the addition of urea were successfully prepared using a simple one-step synthetic method by calcination under different atmospheres (vacuum, He, or N2). The physicochemical, optical, and light-induced charge transfer properties of the as-prepared samples were characterized by various techniques. It was found that a vacuum atmosphere was more beneficial for the formation of oxygen vacancies (OVs) than the inert gases (He and N2) and the addition of urea-inhibited OVs formation. The samples annealed in the vacuum condition exhibited better visible-light adsorption abilities, narrower bandgaps, higher photo-induced charge separation efficiency, and lower recombination rates. Hydroxyl radicals (·OH) were the dominant oxidative species in the samples annealed under a vacuum. Finally, the samples annealed under vacuum conditions displayed higher photocatalytic activity for methylene blue (MB) degradation than the samples annealed under He or N2. Based on the above, this study provides new insights into the effects of annealing atmospheres and urea addition on the properties of black TiO2.

Photo-Induced Charge Transfer on Pt/Bi2WO6 Composite Photocatalysts

2020 ◽  
Vol 20 (3) ◽  
pp. 1838-1844 ◽  
Author(s):  
Dong-Qing He ◽  
Hong-Cheng Liu ◽  
Qi Wang ◽  
Qian Yu ◽  
Jin-Ying Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Separation Efficiency ◽  
Pt Nanoparticles ◽  
Transient Photovoltage ◽  
Composite Photocatalysts ◽  
Induced Charge ◽  
Average Size ◽  
Transfer Properties ◽  
Insight Into

Pt/Bi2WO6 composite photocatalysts were prepared by a facile photoreduction method. Pt nanoparticles with an average size of 5–8 nm were successfully deposited on the surface of Bi2WO6 microspheres and the photocatalytic activity of Bi2WO6 was greatly improved by Pt nanoparticles. The photo-induced charge transfer properties of samples were studied by means of surface photovoltage (SPV) and transient photovoltage (TPV) techniques, giving an insight into the intrinsic reasons of the improvement in photocatalytic activity. The SPV and TPV results revealed that the deposited Pt nanoparticles could trap photo-induced electrons and then largely enhance the separation efficiency of photo-induced charge carriers.

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 Dodecyl Mercaptan Functionalized Copper Mesh for Water Repellence and Oil-water Separation

2021 ◽  
Vol 18 (4) ◽  
pp. 887-899
Author(s):  
Yanling Tian ◽  
Jiekai Feng ◽  
Zexin Cai ◽  
Jiaqi Chao ◽  
Dawei Zhang ◽  
...  
Keyword(s):  
Separation Efficiency ◽  
Synthesis Process ◽  
Water Separation ◽  
Oil Water Separation ◽  
One Step ◽  
Oil Water ◽  
Water Repellence ◽  
Copper Mesh ◽  
Dodecyl Mercaptan

AbstractReckless discharge of industrial wastewater and domestic sewage as well as frequent leakage of crude oil have caused serious environmental problems and posed severe threat to human survival. Various nature inspired superhy-drophobic surfaces have been successfully applied in oily water remediation. However, further improvements are still urgently needed for practical application in terms of facile synthesis process and long-term durability towards harsh environment. Herein, we propose a simple one-step dodecyl mercaptan functionalization method to fabricate Super-hydrophobic-Superoleophilic Copper Mesh (SSCM). The prepared SSCM possesses excellent water repellence and oil affinity, enabling it to successfully separate various oil-water mixtures with high separation efficiency (e.g., > 99% for hexadecane-water mixture). The SSCM retains high separating ability when hot water and strong corrosive aqueous solutions are used to simulate oil-water mixtures, indicating remarkable chemical durability of the dodecyl mercaptan functionalized copper mesh. Additionally, the efficiency can be well maintained during 50 cycles of separation, and the water repellence is even stable after storage in air for 120 days, demonstrating the reusability and long-term stability of the SSCM. Furthermore, the functionalized mesh also shows good mechanical robustness towards abrasion by sandpaper, and oil-water separation efficiency of > 96% can be obtained after 10 cycles of abrasion. The reported one-step dodecyl mercaptan functionalization could be a simple method for increasing the water repellence of copper mesh, and thereby be a great candidate for treating large-scale oily wastewater in harsh environments.

scholarly journals One-step Synthesis of Black TiO2 Composite Coating on Glass by Pulsed Laser Spraying

2019 ◽  
Vol 34 (1) ◽  
pp. 109
Author(s):  
ZHANG Li-Xian ◽  
LIANG Yan-Qin ◽  
WANG Shao-Dan ◽  
LU Hong ◽  
LIU Ai-Feng ◽  
...  
Keyword(s):  
Composite Coating ◽  
Pulsed Laser ◽  
Black Tio2 ◽  
One Step

Ultrathin functional films of titanium(IV) oxide

2012 ◽  
Vol 66 (5) ◽  
Author(s):  
Petr Kluson ◽  
Stepan Kment ◽  
Magdalena Morozova ◽  
Pavel Dytrych ◽  
Stanislav Hejda ◽  
...  
Keyword(s):  
Self Assembly ◽  
Charge Separation ◽  
Separation Efficiency ◽  
Physical Methods ◽  
Structure Morphology ◽  
Charge Separation Efficiency ◽  
Induced Charge ◽  
And Function ◽  
Preparation Techniques ◽  
Intense Research

AbstractChemistry and physics of thin semiconducting layers of various types are subjects of intense research. Especially when nanotechnology methods such as self-assembly are involved, amazing structural and/or functional properties may appear. Also modern physical methods using variously organized plasma arrangements are able to produce uniform structures with distinctive functionality. In this review, based virtually on our own work, discussions on the preparation, structure, morphology, and function of titanium(IV) oxide nanoscopic thin films are presented. It was shown that structurally and functionally similar titanium(IV) oxide films can be prepared via completely different preparation techniques. Function tests were arranged as “primary”, covering the assessment of the light induced charge separation efficiency, and “secondary”, based on photocatalytic surface oxidations.

Fabrication of SiC Dense-Porous Laminates by Electrophoretic Deposition Process

2008 ◽  
Vol 368-372 ◽  
pp. 1841-1843
Author(s):  
Yuan Li ◽  
Ji Qiang Gao ◽  
Jian Feng Yang ◽  
Hong Jie Wang ◽  
Guan Jun Qiao
Keyword(s):  
Electrophoretic Deposition ◽  
Deposition Process ◽  
Green Body ◽  
Sintering Process ◽  
Laminated Structure ◽  
Porous Layers ◽  
Sic Ceramics ◽  
Vacuum Atmosphere ◽  
One Step ◽  
Pore Fraction

In order to obtain dense-porous laminated structure in green bodies of SiC ceramics, rapid aqueous electrophoretic deposition (EPD) was introduced. The suspension for the electrophoretic deposition was prepared using silicon carbide, silicon and carbon powders as the starting materials. During the electrophoretic deposition process, the intending dense and porous layers were deposited alternately to form the green body. After drying, the green bodies were reaction-bonded at 1550°C in vacuum atmosphere. Pore fraction of the porous layers could be adjusted by changing process preferences of EPD and suspension composition. Pore size and size distribution could be controlled by using different sized starting powders. Using this process, no additional substance is necessary to generate the pores via burnt-off, and the dense/porous laminated structure can be obtained by one-step sintering process.

Type-II α-In2S3/In2O3 nanowire heterostructures: evidence of enhanced photo-induced charge separation efficiency

RSC Advances ◽  
2016 ◽  
Vol 6 (15) ◽  
pp. 12561-12570 ◽  
Author(s):  
Li-Chia Tien ◽  
Jhih-Lin Shih
Keyword(s):  
Charge Separation ◽  
Separation Efficiency ◽  
Life Time ◽  
Type Ii ◽  
Nanowire Heterostructures ◽  
Visible Light Driven ◽  
Charge Separation Efficiency ◽  
Induced Charge ◽  
P Type ◽  
Carrier Life Time

Type-II α-In2S3/In2O3 nanowire heterostructures exhibit significant photo-induced carrier life time improvement and visible-light-driven photocatalytic activity.

Preparation of a New Type of Black TiO2 under a Vacuum Atmosphere for Sunlight Photocatalysis

2018 ◽  
Vol 10 (41) ◽  
pp. 35316-35326 ◽  
Author(s):  
Reza Katal ◽  
Mojtaba Salehi ◽  
Mohammad Hossein Davood Abadi Farahani ◽  
Saeid Masudy-Panah ◽  
Say Leong Ong ◽  
...  
Keyword(s):  
Vacuum Atmosphere ◽  
Black Tio2 ◽  
New Type

scholarly journals One-Step Construction of Multi-Walled CNTs Loaded with Alpha-Fe2O3 Nanoparticles for Efficient Photocatalytic Properties

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2820
Author(s):  
Jianle Xu ◽  
Qiang Wen ◽  
Xiao Zhang ◽  
Yinhui Li ◽  
Zeyue Cui ◽  
...  
Keyword(s):  
Visible Light ◽  
High Efficiency ◽  
Separation Efficiency ◽  
Dye Degradation ◽  
Step Method ◽  
Visible Light Photocatalyst ◽  
Defect Sites ◽  
Multi Walled Carbon Nanotubes ◽  
One Step ◽  
The One

The aggregation and the rapid restructuring of the photoinduced electron−hole pairs restructuring in the process of photoelectric response remains a great challenge. In this study, a kind of Multi-walled carbon nanotubes loaded Alpha-Fe2O3 (CNTs/α-Fe2O3) heterostructure composite is successfully prepared via the one-step method. Due to the synergistic effect in the as-prepared CNTs/α-Fe2O3, the defect sites and oxygen-containing functional groups of CNTs can dramatically improve the interface charge separation efficiency and prevent the aggregation of α-Fe2O3. The improved photocurrent and enhanced hole–electron separation rate in the CNTs/α-Fe2O3 is obtained, and the narrower band gap is measured to be 2.8 ev with intensive visible-light absorption performance. Thus, the CNTs/α-Fe2O3 composite serves as an excellent visible light photocatalyst and exhibits an outstanding photocatalytic activity for the cationic dye degradation of rhodamine B (RhB). This research supplies a fresh application area forα-Fe2O3 photocatalyst and initiates a new approach for design of high efficiency photocatalytic materials.

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