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.

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.

scholarly journals Copper oxide supported on graphene for phodegradation of rhodamine B

2015 ◽  
Vol 11 (4) ◽  
Author(s):  
Nurul Sahida Hassan ◽  
Nurul Jamilah Roslani ◽  
Aishah Abdul Jalil ◽  
Sugeng Triwahyono ◽  
Nur Fatien Salleh ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Copper Oxide ◽  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Industrial Wastewater ◽  
Water Contamination ◽  
X Ray Diffraction ◽  
Composite Photocatalyst ◽  
X Ray ◽  
First Order

In recent years, dyes are one of the major sources of the water contamination that lead to environmental problems. For instance, Rhodamine B (RhB) which was extensively used as a colorant in textile industries is toxic and carcinogenic. Among many techniques, photocatalytic degradation become the promising one to remove those dyes from industrial wastewater. Recently, graphene has shown outstanding performance in this application due to its intrinsic electron delocalisation which promotes electron transport between composite photocatalyst and pollutant molecules. While, copper oxide (CuO) is well-known has a lower bandgap energies compared to other semiconductors. Therefore, in this study, copper oxide supported on graphene (CuO/G) was prepared and its photocatalytic activity was tested on degradation of RhB. The catalysts were characterized by X-Ray Diffraction (XRD) and Fourier Transform Infrared (FTIR) Spectroscopy. The results showed that the interaction between copper and graphene support could enhance the photocatalytic activity. The 5 wt% CuO/G was found to give the highest degradation (95%) of 10 mg L-1 of RhB solution at pH 7 using 1 g L-1 catalyst after 4 hours under visible light irradiation. The photodegradation followed the pseudo first-order Langmuir-Hinshelwood kinetic model. This study demonstrated that the CuO/G has a potential to be used in photocatalytic degradation of various organic pollutants.

A Novel Technique to Determine Elastic Constants of Thin Films

2008 ◽  
Vol 1139 ◽  
Author(s):  
Klaus Martinschitz ◽  
Rostislav Daniel ◽  
Christian Mitterer ◽  
Keckes Jozef
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Elastic Moduli ◽  
Elastic Anisotropy ◽  
Interaction Model ◽  
X Ray Diffraction ◽  
X Ray ◽  
Anisotropic Factor ◽  
Polycrystalline Thin Films ◽  
Cu Thin Film

AbstractA new X-ray diffraction technique to determine elastic moduli of polycrystalline thin films deposited on monocrystalline substrates is demonstrated. The technique is based on the combination of sin2ψ and X-ray diffraction wafer curvature techniques which are used to characterize X-ray elastic strains and macroscopic stress in thin film. The strain measurements must be performed for various hkl reflections. The stresses are determined from the substrate curvature applying the Stoney's equation. The stress and strain values are used to calculate hkl reflection dependent X-ray elastic moduli. The mechanical elastic moduli can be then extrapolated from X-ray elastic moduli considering film macroscopic elastic anisotropy. The derived approach shows for which reflection and corresponding value of the X-ray anisotropic factor Γ the X-ray elastic moduli are equal to their mechanical counterparts in the case of fibre textured cubic polycrystalline aggregates. The approach is independent of the crystal elastic anisotropy and depends on the fibre texture type, the texture sharpness, the amount of randomly oriented crystallites and on the supposed grain interaction model. The new method is demonstrated on a fiber textured Cu thin film deposited on monocrystalline Si(100) substrate. The advantage of the new technique remains in the fact that moduli are determined non-destructively, using a static diffraction experiment and represent volume averaged quantities.

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

Photocatalytic activity of cobalt-doped zinc oxide thin film prepared using the spray coating technique

2017 ◽  
Vol 4 (7) ◽  
pp. 076409 ◽  
Author(s):  
Heri Sutanto ◽  
Singgih Wibowo ◽  
Hadiyanto ◽  
Mohammad Arifin ◽  
Eko Hidayanto
Keyword(s):  
Thin Film ◽  
Zinc Oxide ◽  
Photocatalytic Activity ◽  
Spray Coating ◽  
Oxide Thin Film ◽  
Zinc Oxide Thin Film ◽  
Coating Technique

Facile synthesis of Bi2WO6/Bi2O3-loaded polyurethane sponge with enhanced visible light photocatalytic activity

2016 ◽  
Vol 09 (02) ◽  
pp. 1650026 ◽  
Author(s):  
Fengjun Zhang ◽  
Zhi Wang ◽  
Tianye Wang ◽  
Liwei Jia ◽  
Chao Wang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Diffuse Reflectance ◽  
X Ray Diffraction ◽  
Facile Synthesis ◽  
Composite Photocatalyst ◽  
X Ray ◽  
Enhanced Absorption ◽  
Light Region ◽  
Polyurethane Sponge

In this study, Bi2WO6/Bi2O3-loaded polyurethane sponge composite photocatalyst was successfully synthesized via a facile two-step approach. The composite was characterized by X-ray diffraction, ultraviolet-visible diffuse reflectance, and scanning electron microscopy. The Bi2WO6/Bi2O3 photocatalyst was successfully loaded on polyurethane sponge and the composite displayed enhanced absorption in the ultraviolet-to-visible light region. Furthermore, the composite exhibited enhanced photocatalytic activity and reusability towards the degradation of rhodamine B (RhB) under visible light. This work demonstrates a facile method for synthesizing Bi2WO6/Bi2O3-loaded polyurethane sponge with enhanced photocatalytic activity and easy immobilization of the photocatalyst for application in environmental purification.

scholarly journals Preparation of Multicycle GO/TiO2 Composite Photocatalyst and Study on Degradation of Methylene Blue Synthetic Wastewater

2019 ◽  
Vol 9 (16) ◽  
pp. 3282 ◽  
Author(s):  
Zhongtian Fu ◽  
Song Zhang ◽  
Zhongxue Fu
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Raw Materials ◽  
Anatase Phase ◽  
Pure Tio2 ◽  
Synthetic Wastewater ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
Composite Photocatalyst ◽  
Initial Ph

A series of composite photocatalysts were prepared by using graphene oxide (GO) prepared by modified Hummers method and TiO2 hydrogel prepared by using butyl titanate as raw materials. The composite photocatalyst was characterized through scanning electron microscope（SEM）, x ray diffraction （XRD）, and Raman spectroscopy, and the degradation effect of pure TiO2 and composite photocatalyst on methylene blue (MB) dye wastewater under different experimental conditions was studied. The results showed that TiO2 in composite photocatalyst was mainly anatase phase and its photocatalytic activity was better than pure TiO2. When the addition of GO reached 15 wt%, the photocatalytic activity was the highest. When 200 mg composite photocatalyst was added to 200 mL synthetic wastewater with a concentration of 10 mg/L and an initial pH of about 8, the degradation rate could reach 95.8% after 2.5 h. It is presumed that the photogenerated charges of GO/TiO2 composite photocatalyst may directly destroy the luminescent groups in the MB molecule and thus decolorize the wastewater, and no other new luminescent groups are generated during the treatment.

Visible light-degradation of azo dye methyl orange using TiO2/β-FeOOH as a heterogeneous photo-Fenton-like catalyst

2013 ◽  
Vol 68 (10) ◽  
pp. 2178-2185 ◽  
Author(s):  
Zhihui Xu ◽  
Ming Zhang ◽  
Jingyu Wu ◽  
Jianru Liang ◽  
Lixiang Zhou ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Diffuse Reflectance ◽  
X Ray Diffraction ◽  
Composite Photocatalyst ◽  
X Ray ◽  
Light Region ◽  
Visible Light Degradation ◽  
Degradation Of Azo Dye

In this study, a novel TiO2/β-FeOOH composite photocatalyst was synthesized by a hydrothermal method. X-ray diffraction, Fourier transform infrared spectrum, UV-vis diffuse reflectance spectra and scanning electron microscopy (SEM) were used to characterize the composite photocatalyst. The photocatalytic activity of the prepared composite photocatalyst was evaluated in a heterogeneous photo-Fenton-like process using methyl orange (MO) as target pollutant. The TiO2/β-FeOOH composites exhibited higher photocatalytic activity than pure β-FeOOH and TiO2 under visible-light irradiation. The enhanced photocatalytic activity can be ascribed to the formation of TiO2/β-FeOOH heterostructure, which plays an important role in expanding the photoactivity to the visible light region and in effectively prolonging the lifetime of photoinduced electrons and holes. Further investigation revealed that the 25TiO2/β-FeOOH composite synthesized with the TiO2/Fe3+ in a mole ratio of 25:75 showed the highest catalytic activity.

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