scholarly journals The origin of enhanced photocatalytic activities of hydrogenated TiO2 nanoparticles

2017 ◽  
Vol 46 (32) ◽  
pp. 10694-10699 ◽  
Author(s):  
Yani Liu ◽  
Haifeng Feng ◽  
Xiaobing Yan ◽  
Jiaou Wang ◽  
Huagui Yang ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Photocatalytic Activity ◽  
Tio2 Nanoparticles ◽  
Light Absorption ◽  
Active Sites ◽  
Size Structure ◽  
Charge Carriers ◽  
Photocatalytic Activities ◽  
Catalytically Active ◽  
Photoinduced Charge

The photocatalytic activity of semiconductors is largely governed by their light absorption, separation of photoinduced charge carriers and surface catalytically active sites, which are primarily controlled by the morphology, crystalline size, structure, and especially the electronic structure of photocatalysts.

CeO2 Nanocrystal Decorated TiO2 Nanobelt with Enhanced Photocatalytic Performance

2021 ◽  
Vol 21 (4) ◽  
pp. 2647-2652
Author(s):  
Yanchen Ji ◽  
Guoxin Song ◽  
Ruiqi Yang ◽  
Longhua Ding ◽  
Aizhu Wang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Water Treatment ◽  
Light Absorption ◽  
High Performance ◽  
Photocatalytic Performance ◽  
Synthesis Method ◽  
Charge Carriers ◽  
Controllable Synthesis ◽  
Visible Light Absorption ◽  
Potential Applications

In this work, CeO2 nanocrystal-decorated TiO2 nanobelt for forming a CeO2@TiO2 heterostructure. CeO2 plays a dual role in improving photocatalytic activity, not only by promoting the separation and transfer of photogenerated charge carriers, but also by increasing visible light absorption of the photocatalyst as a photosensitizer. The as-prepared CeO2@TiO2 heterostructure demonstrates the performance of organic degradation and H2 production (about 17 μmol/h/g, which is about 2.5 times higher than that of pure TiO2 nanobelts). Our work provides a facile and controllable synthesis method for high performance photocatalyst, which will have potential applications in synthesis clean/solar fuel, and photocatalytic water treatment.

Identifying the catalytically active sites on the layered tri-chalcogenide compounds CoPS3 and NiPS3 for efficient hydrogen evolution reaction

2021 ◽  
Author(s):  
Khorsed Alam ◽  
Tisita Das ◽  
Sudip Chakraborty ◽  
Prasenjit Sen
Keyword(s):  
Density Functional Theory ◽  
Electronic Structure ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Active Sites ◽  
Density Functional ◽  
Electronic Structure Calculations ◽  
Functional Theory ◽  
Catalytically Active ◽  
Structure Calculations

Electronic structure calculations based on density functional theory are used to identify the catalytically active sites for the hydrogen evolution reaction on single layers of the two transition metal tri-chalcogenide...

scholarly journals Visible-light photocatalysis on C-doped ZnO derived from polymer-assisted pyrolysis

RSC Advances ◽  
2015 ◽  
Vol 5 (35) ◽  
pp. 27690-27698 ◽  
Author(s):  
Ahmad S. Alshammari ◽  
Lina Chi ◽  
Xiaoping Chen ◽  
Abdulaziz Bagabas ◽  
Denis Kramer ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Light Absorption ◽  
Oxygen Vacancies ◽  
Charge Carriers ◽  
Visible Light Photocatalysis ◽  
Visible Light Absorption ◽  
C Doping ◽  
Doped Zno

Heavy C-doping can effectively enhance visible-light absorption yet exhibited lower visible-light-responsive photocatalytic activity due to significant recombination of photogenerated charge carriers caused by C-dopant and oxygen vacancies.

scholarly journals Synthesis and enhanced photocatalytic performance of 0D/2D CuO/tourmaline composite photocatalysts

2020 ◽  
Vol 11 ◽  
pp. 407-416 ◽  
Author(s):  
Changqiang Yu ◽  
Min Wen ◽  
Zhen Tong ◽  
Shuhua Li ◽  
Yanhong Yin ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Organic Contaminants ◽  
Hydrothermal Process ◽  
Charge Carriers ◽  
Molecular Vibration ◽  
Surface Element ◽  
Composite Photocatalysts ◽  
Excellent Photocatalytic Activity ◽  
Photoinduced Charge ◽  
Facile Hydrothermal Process

Photocatalysis is considered to be a green and promising technology for transforming organic contaminants into nontoxic products. In this work, a CuO/tourmaline composite with zero-dimensional/two-dimensional (0D/2D) CuO architecture was successfully obtained via a facile hydrothermal process, and its photocatalytic activity was evaluated by the degradation of methylene blue (MB). Surface element valence state and molecular vibration characterization revealed that CuO chemically interacted with tourmaline via Si–O–Cu bonds. The specific surface area of the CuO/tourmaline composite (23.60 m2 g−1) was larger than that of the pristine CuO sample (3.41 m2 g−1). The CuO/tourmaline composite exhibited excellent photocatalytic activity for the degradation of MB, which was ascribed to the increase in the quantity of the adsorption-photoreactive sites and the efficient utilization of the photoinduced charge carriers. This study provides a facile strategy for the construction of 0D/2D CuO structures and the design of tourmaline-based functional composite photocatalysts for the treatment of organic contaminants in water.

Effects of particle size and edge structure on the electronic structure, spectroscopic features, and chemical properties of Au(111)-supported MoS2 nanoparticles

2016 ◽  
Vol 188 ◽  
pp. 323-343 ◽  
Author(s):  
Albert Bruix ◽  
Jeppe V. Lauritsen ◽  
Bjørk Hammer
Keyword(s):  
Electronic Structure ◽  
Active Sites ◽  
Density Functional ◽  
Computational Models ◽  
Chemical Properties ◽  
Structural Motif ◽  
Edge Structure ◽  
Catalytically Active ◽  
Level Shifts ◽  
And Chemical Properties

Materials based on MoS2 are widely used as catalysts and their structure usually consists of single-layered MoS2 nanoparticles whose edges are known to constitute the catalytically active sites. Methods based on density functional theory are used in this work to calculate the electronic structure of representative computational models of MoS2 nanoparticles supported on Au(111). By considering nanoparticles with different edge-terminations, compositions, and sizes, we describe how the electronic structure, Mo3d core-level shifts, and chemical properties (i.e. H adsorption and S vacancy formation) depend on the MoS2 nanoparticle size and structure. In addition, site-specific properties, largely inaccessible when using only slab models of MoS2 edges, are reported, which reveal that the edge sites are not uniform along the nanoparticle and largely depend on the proximity to the corners of the triangular NPs, especially when interacting with a metallic support. Furthermore, a structural motif where H atoms adsorb favourably in a bridging position between two Mo atoms is proposed as an active site for the hydrogen evolution reaction.

scholarly journals Synthesis and Characterization of Graphene Oxide-Modified Bi2WO6and Its Use as Photocatalyst

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Xiaoyue Hu ◽  
Xiangchao Meng ◽  
Zisheng Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Hydrothermal Process ◽  
Charge Carriers ◽  
Synthesis And Characterization ◽  
High Adsorption ◽  
Dye Pollutants ◽  
Photocatalytic Activities ◽  
Template Free

A Bi2WO6photocatalyst modified with graphene was synthesized in a two-step template-free hydrothermal process. The prepared samples were characterized to explore their properties. The photocatalytic activities of the prepared samples were investigated by degrading dye model, Rhodamine B (RhB), under visible light irradiation. This showed that the modified Bi2WO6photocatalyst with 1.2 wt% of graphene greatly improved photocatalytic activity during the degradation of dye pollutants, compared to pure Bi2WO6. The enhancement can be interpreted as the integrated effects of ultrahigh charge carriers’ mobility and high adsorption of RhB on graphene. Additionally, effects including catalysts dosage amount, pH of RhB solution, and temperature of reactor on the photocatalytically degrading RhB were also studied and discussed.

scholarly journals Synthesis, Characterization, and Photocatalytic Activity of g-C3N4/GaN-ZnO Composite

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Nguyen Ha Trang ◽  
Tran Thi Viet Ha ◽  
Nguyen Minh Viet ◽  
Nguyen Minh Phuong
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Recombination Rate ◽  
Active Sites ◽  
High Stability ◽  
Low Cost ◽  
Charge Carriers ◽  
Strong Reduction ◽  
Ft Ir ◽  
Antibiotic Residue

Recently, photocatalysis process has shown great potential as a low-cost, environmentally friendly, and sustainable method for the water/wastewater treatment. Among that, g-C3N4 is one of the most promising photocatalyst and widely used for a variety of applications. In spite of some unique features such as strong reduction ability, active under visible light, nontoxic, and high stability, g-C3N4 photocatalytic capability under visible light is limited due to fast recombination rate of reactive charges. To deal with this issue, in this study, g-C3N4 is combined with GaN-ZnO for reducing the recombination rate of charge carriers and increasing the active sites. The g-C3N4/GaN-ZnO composite was characterized by several methods such as SEM, EDX, XRD, FT-IR, UV-Vis, and BET. It is also observed that the composite with outstanding features can work effectively under visible light; thus, it is likely to be widely applied in environment treatment, especially in antibiotic residue with more than 90% of tetracycline was decomposed after 3 hours.

scholarly journals PHOTOCATALYTIC AND ANTIBACTERIAL ACTIVITIES OF TiO2 AND SILVER AND ZINC DOPED TiO2 NANOPARTICLES

2020 ◽  
Vol 4 (12) ◽  
pp. 92-97
Author(s):  
Chelaramani K. ◽  
Varshney R. ◽  
Bhardwaj A.
Keyword(s):  
Photocatalytic Activity ◽  
Tio2 Nanoparticles ◽  
Sol Gel ◽  
Antibacterial Activities ◽  
Gel Method ◽  
Doped Tio2 ◽  
Sol Gel Method ◽  
Photocatalytic Activities ◽  
Physical And Chemical ◽  
Co Doped

The TiO2 and Ag and Zn doped TiO2 nanoparticles were synthesized by sol-gel method.The sol-gel method is one of the versatile method to prepare doped and co-doped nanoparticles. sol gel method has emerged as simpler and better option than physical and chemical procedures as it is fast, clean and eco-friendly alternative that does not involve any costly instruments .Synthesis of doped and co-doped nanoparticles having good photocatalytic activity have great potential for the degradation of dye. We have tried to develop new effective antimicrobial reagents with good photocatalytic activities which are not resistant to disease causing microbes.

One step synthesis of efficient photocatalysts by TCAP doped g-C3N4 for enhanced visible-light photocatalytic activity

2020 ◽  
Vol 44 (3) ◽  
pp. 1127-1137 ◽  
Author(s):  
Hao Wu ◽  
Yaoxing Huo
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Surface Area ◽  
Light Absorption ◽  
Defect Structure ◽  
Charge Carriers ◽  
Visible Light Absorption ◽  
Efficient Separation ◽  
One Step ◽  
Visible Light Photocatalytic

CN/TCAP with enhanced visible light absorption, large surface area and defect structure allow efficient separation of charge carriers.

scholarly journals Electronic structure and photocatalytic activity of wurtzite Cu–Ga–S nanocrystals and their Zn substitution

2015 ◽  
Vol 3 (16) ◽  
pp. 8896-8904 ◽  
Author(s):  
Tarek A. Kandiel ◽  
Dalaver H. Anjum ◽  
Philippe Sautet ◽  
Tangui Le Bahers ◽  
Kazuhiro Takanabe
Keyword(s):  
Electronic Structure ◽  
Photocatalytic Activity ◽  
Zn Substitution ◽  
Photocatalytic Activities

Stoichiometric and gallium-rich wurtzite Cu–Ga–S ternary nanocrystals with and without Zn substitution were synthesized and their electronic structure and photocatalytic activities were investigated.

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