Study of Photocatalytic Activity of TiO2 Nanotube Derived from Different Anodized Parameters

2012 ◽  
Vol 488-489 ◽  
pp. 1519-1524 ◽  
Author(s):  
Kittirong Srimuangmak ◽  
Sutham Niyomwas
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
High Performance ◽  
Uv Light ◽  
Photocatalytic Reaction ◽  
Uv Light Irradiation ◽  
Anodization Process ◽  
Temperature Time ◽  
Anodization Method

In this study titanium dioxide nanotube (TNT) were prepared by anodization method. The effects of the temperature, time and voltage on the anodization process were investigated in detail. Photocatalytic activity of the TNT films was evaluated in terms of the degradation of methylene blue in aqueous solution under UV light irradiation. The results showed that the optimization of temperature, voltage and time on anodization process were 45oC, 20 V and 1 day, respectively. Consequently, these results indicate that the optimization of anodization process is critical to achieve the high performance of photocatalytic reaction.

Facile Preparation of Nanoporous SnO2 for Application in Photodegradation of Methylene Blue

2011 ◽  
Vol 194-196 ◽  
pp. 385-388
Author(s):  
Hong Juan Wang ◽  
Feng Qiang Sun ◽  
Ming Zhong Ren ◽  
Qing Wei Guo
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Photocatalytic Performance ◽  
Uv Light ◽  
High Photocatalytic Activity ◽  
N2 Adsorption ◽  
Photochemical Method ◽  
Degussa P25 ◽  
Adsorption Desorption

Nanoporous SnO2with high photocatalytic activity has been successfully prepared by a photochemical method, using SnCl2aqueous solution as a precursor. The as-synthesized sample was characterized by XRD, N2 adsorption-desorption and UV-vis. The photocatalytic activity of the sample was evaluated by degrading methylene blue (MB) aqueous solution under the UV light source and was compared with that of the commercial titania (Degussa P25). The results showed that the produced SnO2can degrade MB solution quickly and has comparative photocatalytic performance with P25 for degrading MB. This facile method supplies an effective way to prepare SnO2photocatalyst.

Effect of Niobium on the Structure and Photoactivity of Anatase (TiO2) Nanoparticles

2006 ◽  
Vol 6 (3) ◽  
pp. 762-770 ◽  
Author(s):  
Masanori Hirano ◽  
Kazumasa Matsushima
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Solid Solutions ◽  
Uv Light ◽  
Anatase Tio2 ◽  
Hydrothermal Conditions ◽  
Niobium Content ◽  
Uv Light Irradiation ◽  
Adsorption Amount ◽  
Hydrolysis Of

Anatase-type TiO2 nanoparticles doped with 0–30 mol% niobium were directly formed from precursor solutions of TiOSO4 and NbCl5 under mild hydrothermal conditions at 120–180 °C for 5 h using the hydrolysis of urea. When the niobium content increased from 0 to 30 mol%, the crystallite size of anatase increased from 8.5 to 19 nm. The band gap of anatase was slightly decreased by making solid solutions with niobium. Their photocatalytic activity and adsorptivity were evaluated separately by the measurement of the concentration of methylene blue (MB) remained in the solution after maintained in the dark or under UV-light irradiation. To form anatase-type solid solutions by doping 5–15 mol% niobium into TiO2 was effective for improvement of the photoactivity of TiO2. The photocatalytic activity (the photooxidation rate) and the adsorption amount of MB for the sample containing 15 mol% niobium became more than approximately nine times and six times as much as those of the hydrothermal anatase-type pure TiO2, respectively.

Photocatalytic Enhancement in Methylene Blue Degradation of TiO2 Photocatalysts via Graphene Hybridization

2012 ◽  
Vol 512-515 ◽  
pp. 1677-1681
Author(s):  
Feng Zhou ◽  
Ying Qing Fu ◽  
Xin Wan
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Uv Light ◽  
Light Irradiation ◽  
Tio2 Photocatalyst ◽  
Electron Hole ◽  
Methylene Blue Degradation ◽  
Uv Light Irradiation ◽  
High Migration ◽  
Facile Route

A facile route was demonstrated to obtain an efficient graphene-hybridized TiO2 photocatalyst. The photodegradation results of Methylene Blue over graphene hybridized with TiO2 showed that the photocatalytic activity could be significantly enhanced under UV light irradiation. The structure between TiO2 and graphene as well as its effect on the photocatalytic activity were systematically investigated. The mechanism of the enhanced photocatalytic activity is based to the high migration efficiency and the inhibition of recombination of photoinduced electron-hole pairs. The graphene hydridization is proven to be a promising approach to develop highly efficient and stable photocatalysts under UV light irradiation.

Highly enhanced photocatalytic properties of ZnS nanowires–graphene nanocomposites

RSC Advances ◽  
2014 ◽  
Vol 4 (58) ◽  
pp. 30798-30806 ◽  
Author(s):  
Jian Cao ◽  
Qianyu Liu ◽  
Donglai Han ◽  
Shuo Yang ◽  
Jinghai Yang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Uv Light ◽  
Light Irradiation ◽  
Photocatalytic Properties ◽  
Graphene Nanocomposites ◽  
Uv Light Irradiation ◽  
Excellent Photocatalytic Activity

ZnS–graphene nanocomposites exhibit excellent photocatalytic activity for degradation of methylene blue under UV light irradiation.

Photocatalytic activity of kaolin–titania composites to degrade methylene blue under UV light irradiation; kinetics, mechanism and thermodynamics

2021 ◽  
Author(s):  
Muhamad Rafiq Kamaluddin ◽  
Nur Izzah Iwanina Zamri ◽  
Eny Kusrini ◽  
Wuwuh Wijang Prihandini ◽  
Abdul Hanif Mahadi ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Uv Light ◽  
Light Irradiation ◽  
Uv Light Irradiation

scholarly journals Determination of the photocatalytic activity of TiO2 coatings on clay roofing tile substrates methylene blue as model pollutant

2009 ◽  
pp. 125-133 ◽  
Author(s):  
Eva Loncar ◽  
Miroslava Radeka ◽  
Snezana Petrovic ◽  
Andrea Skapin ◽  
Ognjen Rudic ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Uv Light ◽  
Photocatalytic Efficiency ◽  
Poly Ethylene Glycol ◽  
Spray Technique ◽  
Tio2 Coatings ◽  
Poly Ethylene

The photocatalytically active mesoporous coatings, based on titanium dioxide sols (Degussa), of the fired clay roofing tiles substrate were prepared by using poly(ethylene glycol) (PEG) M-600 and M-4000, as the structure directing agents. The coatings were deposited using spray technique followed by thermal treatment. Photocatalytic activity of the TiO2 coatings was evaluated by aqueous solution of methylene blue as model dye, deposited on the top of the coatings, after irradiation with UV light. The results were compared with the photocatalytic efficiency of some commercial self-cleaning products (clay roofing tiles, glass). The newly design coatings showed an interesting decolourisation performance (over 30 % after 24 h). It appeared that the procedure of photocatalytic activity determination, in the case of porous substrates, should be renewed by a preadsorption process.

Microwave synthesis of pure and doped cerium (IV) oxide (CeO2) nanoparticles for methylene blue degradation

2016 ◽  
Vol 74 (10) ◽  
pp. 2325-2336 ◽  
Author(s):  
W. M. A. El Rouby ◽  
A. A. Farghali ◽  
A. Hamdedein
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Uv Light ◽  
Hydrothermal Process ◽  
Ceo2 Nanoparticles ◽  
Light Irradiation ◽  
Trivalent Cation ◽  
Organic Carbon Content ◽  
Uv Light Irradiation ◽  
Doped Ceo2

Cerium (IV) oxide (CeO2), samarium (Sm) and gadolinium (Gd) doped CeO2 nanoparticles were prepared using microwave technique. The effect of microwave irradiation time, microwave power and pH of the starting solution on the structure and crystallite size were investigated. The prepared nanoparticles were characterized using X-ray diffraction, FT-Raman spectroscopy, and transmission electron microscope. The photocatalytic activity of the as-prepared CeO2, Sm and Gd doped CeO2 toward degradation of methylene blue (MB) dye was investigated under UV light irradiation. The effect of pH, the amount of catalyst and the dye concentration on the degradation extent were studied. The photocatalytic activity of CeO2 was kinetically enhanced by trivalent cation (Gd and Sm) doping. The results revealed that Gd doped CeO2 nanoparticles exhibit the best catalytic degradation activity on MB under UV irradiation. For clarifying the environmental safety of the by products produced from the degradation process, the pathways of MB degradation were followed using liquid chromatography/mass spectroscopy (LC/MS). The total organic carbon content measurements confirmed the results obtained by LC/MS. Compared to the same nanoparticles prepared by another method, it was found that Gd doped CeO2 prepared by hydrothermal process was able to mineralize MB dye completely under UV light irradiation.

Decolorization of Reactive Blue 220 aqueous solution using fungal synthesized Co3O4 nanoparticles

2019 ◽  
Vol 68 (8) ◽  
pp. 675-686 ◽  
Author(s):  
Riya Sidhikku Kandath Valappil ◽  
Ajuy Sundar Vijayanandan ◽  
Raj Mohan Balakrishnan
Keyword(s):  
Activation Energy ◽  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Reaction Time ◽  
Reaction Kinetics ◽  
Uv Light ◽  
Textile Dye ◽  
Co3o4 Nanoparticles ◽  
Alkaline Ph ◽  
Uv Light Irradiation

Abstract In this work, the photocatalytic activity of the biosynthesized cobalt oxide (Co3O4) nanoparticle (NP) is investigated using a textile dye Reactive Blue 220 (RB220) and decolorization % was monitored using UV–Vis spectrophotometer. The photocatalytic activity has been observed maximum at alkaline pH of 9, NP dosage of 250 mg/L, and reaction time of 270 min. In the presence of UV light irradiation, a maximum dye concentration of 10 mg/L was treated effectively using 150 mg/L NP, and 67% decolorization was achieved. Reaction kinetics has been analyzed, and the reaction followed the pseudo kinetics model with an activation energy of −484 kJ mol−1.

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