scholarly journals Preparation ofNaTaO3by Spray Pyrolysis and Evaluation of Apparent Photocatalytic Activity for Hydrogen Production from Water

2008 ◽  
Vol 2008 ◽  
pp. 1-8 ◽  
Author(s):  
Hyun Woo Kang ◽  
Eun-Jung Kim ◽  
Seung Bin Park
Keyword(s):  
Photocatalytic Activity ◽  
Quantum Yield ◽  
Hydrogen Production ◽  
Spray Pyrolysis ◽  
Uv Light ◽  
Precursor Solution ◽  
Photocatalytic Reactor ◽  
Photocatalytic Activities ◽  
Uv Lamp ◽  
Spray Pyrolysis Process

NaTaO3photocatalyst was prepared by spray pyrolysis process and tested as photocatalyst for water splitting under UV light. Precursor solution was prepared fromNaNO3andTa(OC2H5)5in nitric acid solution and spray-pyrolyzed in air at between 973 and 1273 K. Considerable enhancement of photocatalytic activity was achieved by loading0.05∼0.2 wt% of NiO on the surface ofNaTaO3. The NiO loading was more effective on theNaTaO3synthesized by spray pyrolysis in comparison with that synthesized by solid-state reaction. The quantum yield (QY) ofNiO/NaTaO3photocatalyst was measured by chemical actinometry using potassium ferrioxalate and compared with the apparent photocatalytic activities (APA) which would be more useful for the purpose of photocatalytic reactor design than the quantum yield. The apparent photocatalytic activity (APA) was defined by the rate of hydrogen production divided by weight of catalyst, volume of reactant mixture, duration of irradiation, and power of UV lamp. The validity of the apparent photocatalytic activity (APA) was discussed based on our results and reported activities ofNaTaO3photocatalyst loaded with or without NiO.

Controlling the visible-light driven photocatalytic activity of alloyed ZnSe–AgInSe2 quantum dots for hydrogen production

2020 ◽  
Vol 8 (26) ◽  
pp. 13142-13149 ◽  
Author(s):  
Ping-Yen Hsieh ◽  
Tatsuya Kameyama ◽  
Takayuki Takiyama ◽  
Ko Masuoka ◽  
Takahisa Yamamoto ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Quantum Yield ◽  
Hydrogen Production ◽  
Visible Light ◽  
Apparent Quantum Yield ◽  
Visible Light Driven

Alloyed ZnSe–AgInSe2 quantum dots were used as a photocatalyst for H2 production, showing an apparent quantum yield of 3.4% at 600 nm.

Synthesis of Composite TiO2/Natural Cotton Cellulose Nanofiber with Photocatalytic Property

2014 ◽  
Vol 665 ◽  
pp. 393-396
Author(s):  
Qiu Yan Liu ◽  
Jing Li ◽  
Jun Cao ◽  
Chao Rong Li
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Organic Pollutant ◽  
Sol Gel ◽  
Photocatalytic Property ◽  
Important Application ◽  
Anatase Structure ◽  
Uv Light Irradiation ◽  
Photocatalytic Activities ◽  
Hydrothermal Methods

TiO2/NCCN nanocomposites have been prepared by sol-gel and hydrothermal methods. Firstly, the NCCN was prepared by electrospinning technology, then the amorphous TiO2films were coated on the surface of the NCCN by a sol-gel method, and TiO2(anatase structure) nanoparticles could be fixed on the surface of NCCN by a hydrothermal method to get higher photocatalysis efficiency. The photocatalytic activities indicate that the TiO2/NCCN nanocomposites exhibited a good photocatalytic activity for photodegradation of methylthionine chloride (MO) solution under UV light irradiation, leading to an important application in photodegradation of organic pollutant.

scholarly journals Photocatalytic Activity of Fibrous Ti/Ce Oxides Obtained by Hydrothermal Impregnation of Short Flax Fibers

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3399
Author(s):  
Mikhail F. Butman ◽  
Nataliya E. Kochkina ◽  
Nikolay L. Ovchinnikov ◽  
Karl W. Krämer
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Solution Process ◽  
Precursor Solution ◽  
Pure Tio2 ◽  
Photocatalytic Decomposition ◽  
Surface Irregularity ◽  
Hydrothermal Conditions ◽  
Flax Fibers ◽  
Vis Spectroscopy

Fibrous Ti/Ce oxide photocatalysts were prepared for the first time by a biomimetic solution process using short flax fibers (flax straw processing waste) as a biotemplate. Titanium polyhydroxy complex solutions with 3% and 5% cerium were used as precursors. Flax fibers were impregnated in an autoclave under hydrothermal conditions. Ti/Ce oxides were obtained from the biotemplate by annealing at 600 °C. The photocatalytic activity of the Ti/Ce oxides was studied by the adsorption and decomposition of the dye rhodamine B under UV irradiation. The photocatalytic decomposition of the dye was 50% and 75% faster for Ti/Ce oxides with 3% and 5% Ce, respectively, than for the analogous undoped fibrous TiO2. The morphologies, textures, and structures of the photocatalysts were studied by scanning electron microscopy, low temperature N2 adsorption/desorption, UV-Vis spectroscopy, and X-ray and XPS analytical methods. It was shown that the introduction of Ce into the precursor solution increased the surface irregularity of the Ti/Ce oxide crystallites compared to pure TiO2. This effect scaled with the Ce concentration. Ce improved the UV light absorption of the material. The Ti/Ce oxides contained Ce4+/Ce3+ pairs that played an important role in redox processes and intensified the photocatalytic activity.

Highly active Ta2O5 microcubic single crystals: facet energy calculation, facile fabrication and enhanced photocatalytic activity of hydrogen production

2016 ◽  
Vol 4 (42) ◽  
pp. 16562-16568 ◽  
Author(s):  
Hao Tu ◽  
Leilei Xu ◽  
Fangzhi Mou ◽  
Jianguo Guan
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Production ◽  
Single Crystals ◽  
High Energy ◽  
Large Percentage ◽  
Energy Calculation ◽  
Topological Transformation ◽  
Highly Active ◽  
Photocatalytic Activities ◽  
Facile Fabrication

Ta2O5 single crystals microcubic with large percentage of high-energy {001} facets are fabricated through topological transformation exhibit enhanced photocatalytic activities.

scholarly journals Enhanced Visible and Ultraviolet Light-Induced Gas-Phase Photocatalytic Activity of TiO2 Thin Films Modified by Increased Amount of Acetylacetone in Precursor Solution for Spray Pyrolysis

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1011
Author(s):  
Jekaterina Spiridonova ◽  
Arvo Mere ◽  
Malle Krunks ◽  
Merilin Rosenberg ◽  
Anne Kahru ◽  
...  
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Spray Pyrolysis ◽  
Flow Reactor ◽  
Ultrasonic Spray Pyrolysis ◽  
Precursor Solution ◽  
Molar Ratio ◽  
Tio2 Thin Films ◽  
Ultrasonic Spray ◽  
Great Possibility

TiO2 thin films, modified by acetylacetone (AcacH) in solution, were deposited on glass substrate by ultrasonic spray pyrolysis and tested for photocatalytic activity in a multi-section continuous flow reactor by degradation of acetone and acetaldehyde under ultraviolet and visible light. The increase in molar ratio of AcacH in respect of titanium (IV) isopropoxide (TTIP) from 1:5 to 1:8 modified the electronic structure of the films, favoring enhanced photocatalytic activity. The photocatalytic activity was enhanced approximately twofold on the film with molar ratio 1:8 under both irradiations; the film completely oxidized 10 ppm of acetone and acetaldehyde. The photocatalytic efficacy of TiO2 films in oxidation of air pollutants was three times higher compared to the industrial glass Pilkington ActivTM. Moreover, all the synthesized films indicate antibacterial efficiency against E. coli of over 99% under ultraviolet. TiO2 film, with TTIP:AcacH molar ratio 1:8 having great possibility for its commercial use as a material for indoor air purification.

scholarly journals Enhanced Photocatalytic Activity of Powders (P25) via Calcination Treatment

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Guohong Wang ◽  
Lin Xu ◽  
Jun Zhang ◽  
Tingting Yin ◽  
Deyan Han
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Oxidation ◽  
Uv Light ◽  
Bet Surface Area ◽  
Photocatalytic Activities ◽  
Before And After ◽  
Different Temperatures ◽  
Uv Visible ◽  
Adsorption Desorption ◽  
Calcination Treatment

P25 TiO2powders were calcined at different temperatures in a muffle furnace in air. The P25 powders before and after calcination treatment were characterized with XRD FTIR, UV-visible diffuse reflectance spectra, SEM, TEM, HRTEM, and N2adsorption-desorption measurements. The photocatalytic activity was evaluated by the photocatalytic oxidation of methyl orange aqueous solution under UV light irradiation in air. The results showed that calcination treatment obviously influenced the microstructures and photocatalytic activity of the P25 TiO2powders. The synergistic effect of the phase structure, BET surface area, and crystallinity on the photocatalytic of TiO2powders (P25) after calcination was investigated. An optimal calcination temperature () was determined. The photocatalytic activity of TiO2powders calcined at was nearly 2 times higher than that of the uncalcined P25 TiO2. The highest photocatalytic activities of the calcined samples at for 4 h might be ascribed to the enhancement of anatase crystallization and the optimal mass ratio (ca. 1 : 2) of rutile to anatase.

Hydrothermal Synthesis and Photocatalytic Properties of BiPO4/Ag3PO4 Heterostructure for Phenol Decomposition

2014 ◽  
Vol 911 ◽  
pp. 92-96 ◽  
Author(s):  
Uyi Sulaeman ◽  
Hesti Pratiwi ◽  
Anung Riapanitra ◽  
Ponco Iswanto ◽  
Shu Yin ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
The Body ◽  
Molar Ratio ◽  
Body Centered Cubic ◽  
Uv Light Irradiation ◽  
Bet Specific Surface Area ◽  
Photocatalytic Activities ◽  
Phenol Decomposition ◽  
Cubic Structure

The heterostructures of BiPO4/Ag3PO4 were synthesized using a hydrothermal method with starting materials of Bi5O(OH)9(NO3)4, AgNO3 and Na2HPO4.12H2O at pH 1 under heating of 180°C for 12 h. The products were characterized using XRD, DRS and BET specific surface area. The photocatalytic activities were determined through the phenol decomposition under UV light (λ=390 nm) and blue light (λ=445 nm) irradiation. The heterostructures of BiPO4/Ag3PO4 with the body-centered cubic structure of Ag3PO4 and monoclinic of BiPO4 were successfully synthesized. The photocatalytic activity of BiPO4 under UV light irradiation could be enhanced by designing of BiPO4/Ag3PO4 heterostructure with the molar ratio of 0.75/0.25.

Enhanced photocatalytic ability from carbon-doped ZnO photocatalyst synthesized without an external carbon precursor

2014 ◽  
Vol 07 (03) ◽  
pp. 1450026 ◽  
Author(s):  
Dong En Zhang ◽  
Ming Yan Wang ◽  
Juan Juan Ma ◽  
Gui Quan Han ◽  
Shu An Li ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Zno Nanoparticles ◽  
Uv Light ◽  
Electron Hole ◽  
Photocatalytic Ability ◽  
Carbon Doped ◽  
Photocatalytic Activities ◽  
Electron Hole Pair ◽  
Doped Zno ◽  
Degree Of Degradation

We report a simple synthesis of C -doped ZnO composite nanoparticles by a solvothermal treatment of Zn ( OAc )2 ⋅ 2 H 2 O that provides a source of both zinc and carbon. The photocatalytic activities of the composites were evaluated by the degree of degradation rhodamine B in aqueous solutions at room temperature with near UV light irradiation. These nanocomposites exhibit higher photocatalytic activity compared with pure ZnO nanoparticles. The enhancement of photocatalytic activity of C -doped ZnO nanoparticles is mainly attributed to their absorbed more photons and reduced electron hole pair recombination.

Co-molten solvothermal method for synthesizing chalcopyrite CuFe1−xCrxS2 (x ≤ 0.4): high photocatalytic activity for the reduction of nitrate ions

2014 ◽  
Vol 43 (41) ◽  
pp. 15385-15390 ◽  
Author(s):  
Jia Yang ◽  
Mufei Yue ◽  
Jing Ju ◽  
Rihong Cong ◽  
Wenliang Gao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Oxalic Acid ◽  
Solvothermal Method ◽  
Uv Light ◽  
High Photocatalytic Activity ◽  
Nitrate Ions ◽  
Photocatalytic Activities ◽  
Method Show

CuFe1−xCrxS2 prepared by a thiourea–oxalic acid co-molten solvothermal method show superior UV-light photocatalytic activities toward nitrate ions reduction.

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