Influence of oxidation process on photocatalytic activity of photocatalyst coatings by mechanical coating technique

2015 ◽  
Vol 30 ◽  
pp. 128-134 ◽  
Author(s):  
Yun Lu ◽  
Kouta Kobayashi ◽  
Sujun Guan ◽  
Liang Hao ◽  
Hiroyuki Yoshida ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Oxidation Process ◽  
Coating Technique ◽  
Mechanical Coating

Influence of Oxidation Temperature on Photocatalytic Activity of Cr-TiO2 Coatings by Mechanical Coating Technique

2015 ◽  
Vol 833 ◽  
pp. 177-180
Author(s):  
Su Jun Guan ◽  
Yun Lu ◽  
Liang Hao ◽  
Shunsuke Takaya ◽  
Kohei Miyazawa ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Mass Fraction ◽  
Oxidation Process ◽  
Composite Coatings ◽  
Oxidation Temperature ◽  
Sem Images ◽  
Coating Technique ◽  
Ti Powder ◽  
Mechanical Coating ◽  
Structure And Microstructure

The photocatalyst coatings on alumina (Al2O3) balls had been prepared by mechanical coating technique (MCT) and subsequent oxidation process with Ti powder and Cr powder, and the influence of oxidation temperature on the photocatalyst composite coatings (Cr-TiO2) were investigated. The contrast experiments of the oxidation temperature and the usage of Cr powder had been carried out. The crystal structure and microstructure of the coatings were investigated. Photocatalytic activity of the coatings was evaluated and discussed. The XRD results showed that the mixed-phase of anatase (A) and rutile (R), and mass fraction of rutile (XR) had been increased with adding Cr, especially under 973 K. The SEM images indicated that the needle-like oxide was formed at the temperature of 973 K. The photocatalytic activity is relatively higher at 973 K under both of ultraviolet (UV) and visible light (VL). At the same time, the influence on photocatalytic activity of the photocatalyst coatings under UV or VL by adding Cr would guide the direction for the improvement of photocatalytic activity.

Fabrication of TiO2/Cu Composite Photocatalyst Thin Film by 2-Step Mechanical Coating Technique and its Photocatalytic Activity

2011 ◽  
Vol 415-417 ◽  
pp. 1942-1948 ◽  
Author(s):  
Yun Lu ◽  
Liang Hao ◽  
Keisuke Toh ◽  
Hiroyuki Yoshida
Keyword(s):  
Thin Film ◽  
Photocatalytic Activity ◽  
Separation Efficiency ◽  
Composite Thin Film ◽  
X Ray Diffraction ◽  
Composite Photocatalyst ◽  
Coating Technique ◽  
Cu Thin Film ◽  
Mechanical Coating ◽  
Mass Increase

A novel TiO2/Cu composite photocatalyst thin film was successfully fabricated by 2-step Mechanical Coating Technique (2-step MCT). The composite photocatalyst thin film was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), among others. The formation process of Cu thin film and TiO2/Cu composite photocatalyst thin film were also examined. The results revealed that the formation of Cu thin film can fall into the following stages: nucleation, growth of nuclei and connection, formation and thickening of continuous thin film, and the exfoliation of thin film. In addition, TiO2/Cu composite thin film had a composite microstructure of TiO2islands coated on Cu thin film. Furthermore, the photocatalytic activity of TiO2/Cu composite photocatalyst thin film was evaluated by measuring the degradation rate of methylene blue (MB). Enhancement on the photocatalytic activity of TiO2was confirmed. The improvement of the photocatalytic activity of TiO2/Cu composite photocatalyst thin film should result from the increase of the charge separation efficiency and the mass increase of TiO2in the composite thin film.

scholarly journals Fabrication of Photocatalyst Composite Coatings of Cr-TiO2 by Mechanical Coating Technique and Oxidation Process

Coatings ◽  
2015 ◽  
Vol 5 (3) ◽  
pp. 545-556 ◽  
Author(s):  
Sujun Guan ◽  
Liang Hao ◽  
Yun Lu ◽  
Hiroyuki Yoshida ◽  
Hiroshi Asanuma
Keyword(s):  
Oxidation Process ◽  
Composite Coatings ◽  
Coating Technique ◽  
Mechanical Coating

Formation of TiO2/Ti Composite Photocatalyst Film by 2-Step Mechanical Coating Technique

2011 ◽  
Vol 675-677 ◽  
pp. 1229-1232 ◽  
Author(s):  
Yun Lu ◽  
Hiroyuki Yoshida ◽  
Hiroyuki Nakayama ◽  
Liang Hao ◽  
Mitsuji Hirohashi
Keyword(s):  
Photocatalytic Activity ◽  
Composite Film ◽  
Random Distribution ◽  
High Photocatalytic Activity ◽  
Anatase Tio2 ◽  
Composite Photocatalyst ◽  
Simple Process ◽  
Coating Technique ◽  
Nonuniform Thickness ◽  
Mechanical Coating

In the present work, 2-step mechanical coating technique (2-step MCT), an advanced MCT, was proposed and carried out to form TiO2/Ti composite photocatalyst film with anatase TiO2. The microstructures and photocatalytic activity of the composite film were investigated. The results show that the proposed 2-step MCT is a simple process for forming TiO2/Ti composite film. The composite film has a microstructure with a nonuniform thickness, like random distribution islands. The TiO2/Ti composite film has high photocatalytic activity, which is related with crystallinity and volume of the TiO2 in the composite film.

Fabrication of TiO2 film by mechanical coating technique and its photocatalytic activity

2009 ◽  
Vol 475 (1-2) ◽  
pp. 383-386 ◽  
Author(s):  
Hiroyuki Yoshida ◽  
Yun Lu ◽  
Hiroyuki Nakayama ◽  
Mitsuji Hirohashi
Keyword(s):  
Photocatalytic Activity ◽  
Tio2 Film ◽  
Coating Technique ◽  
Mechanical Coating

Fabrication and Photocatalytic Activity of Photocatalyst Coatings by Mechanical Coating Technique and the Oxidation at Relatively Low Temperatures

2015 ◽  
Vol 719-720 ◽  
pp. 17-20
Author(s):  
Yun Lu ◽  
Liang Hao ◽  
Kohta Kobayashi ◽  
Hiromasa Sato ◽  
Hiroyuki Yoshida ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Photocatalytic Activity ◽  
Low Temperatures ◽  
Anatase Phase ◽  
Oxidation Temperature ◽  
Coating Technique ◽  
Mechanical Coating ◽  
Structure And Microstructure

Titanium (Ti) coatings on alumina (Al2O3) balls fabricated by mechanical coating technique (MCT) were oxidized at relatively low temperatures. Crystal structure and microstructure of the coatings were investigated. Photocatalytic activity of the coatings was evaluated and discussed. The results showed that TiO2 films on Ti or Ti/TiO2 coatings were fabricated by the MCT and subsequent heat oxidation. The TiO2 is anatase phase if the heat oxidation temperature is under 773 K. The TiO2 is the mixed phases of anatase and rutile if the heat oxidation temperature is in the range of 673–973 K. Besides, rutile TiO2 is formed if the heat oxidation temperature is beyond 1073 K. Photocatalytic activity of anatase TiO2 is higher than rutile TiO2.

Preparation and Photocatalytic Activity of TiO2-Copper Oxides Composite Coatings by Mechanical Coating Technique and Heat Oxidation

2015 ◽  
Vol 719-720 ◽  
pp. 13-16
Author(s):  
Yun Lu ◽  
Liang Hao ◽  
Kou Matsuzaka ◽  
Hiroyuki Yoshida ◽  
Su Jun Guan ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Composite Coatings ◽  
High Photocatalytic Activity ◽  
Copper Oxides ◽  
Coating Technique ◽  
Composite Microstructure ◽  
Mechanical Coating

Photocatalytic TiO2–Copper oxides composite coatings were prepared by the mechanical coating technique (MCT) and subsequent heat oxidation. The results showed that Cu particles were mainly adhered to the surfaces of the Ti–Cu composite coatings. After heat oxidation,the Ti coatings were partly oxidized to rutile TiO2 and a Ti–TiO2–Cu2O–CuO composite microstructure was formed. These composite coatings had relative high photocatalytic activity because of the formation of the TiO2–Ti composite microstructure and TiO2–Cu2O–CuO p–n heterojunctions.

Photocatalytic activity of TiO2/Ti composite coatings fabricated by mechanical coating technique and subsequent heat oxidation

2013 ◽  
Vol 16 (6) ◽  
pp. 1949-1956 ◽  
Author(s):  
Yun Lu ◽  
Kou Matsuzaka ◽  
Liang Hao ◽  
Yutaka Hirakawa ◽  
Hiroyuki Yoshida ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Composite Coatings ◽  
Coating Technique ◽  
Mechanical Coating

A review on TiO2-based composites for superior photocatalytic activity

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Wail Al Zoubi ◽  
Abbas Ali Salih Al-Hamdani ◽  
Baek Sunghun ◽  
Young Gun Ko
Keyword(s):  
Photocatalytic Activity ◽  
Organic Pollutants ◽  
Cost Efficiency ◽  
High Stability ◽  
Photocatalytic Oxidation ◽  
Oxidation Process ◽  
Ambient Conditions ◽  
Photoelectrochemical Activity ◽  
As Doping ◽  
Degradation Of Pollutants

Abstract Heterogeneous photocatalysts was a promising material for removing organic pollutants. Titanium dioxide (TiO2) was a suitable photocatalyst for its cost efficiency and high stability to reduce various pollutants. Enhancing TiO2 photocatalyst performance by doping with changed metals or non-metal ions and organic compounds have been reviewed. These methods could enhance photoelectrochemical activity via: (i) by a donor of electrons via electron-donor agents that would produce particular defects in TiO2 structure and capture transporters of charge; (ii) by reducing recombination rate of the charge transporters and increasing degradation of pollutants. This study investigates the modification approaches of TiO2 that comprise methods for overcoming the essential TiO2 restrictions and enhancing the photocatalytic degradation of organic pollutants. Consequently, it emphasized on the current progress of modified-TiO2 used for different pollutants in ambient conditions. Amendment techniques, such as inorganic and organic parts as doping, are studied. The reported experimental results obtained with the photocatalytic oxidation process for degrading organic pollutants were also collected and assessed.

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