scholarly journals Impact of Overlapping Fe/TiO2Prepared by Sol-Gel and Dip-Coating Process on CO2Reduction

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Akira Nishimura ◽  
Xuyan Zhao ◽  
Takuya Hayakawa ◽  
Noriaki Ishida ◽  
Masafumi Hirota ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Uv Light ◽  
Sol Gel ◽  
Base Material ◽  
Visible Spectrum ◽  
Dip Coating ◽  
Coating Process ◽  
Illumination Condition ◽  
Base Materials ◽  
Materials Used

Fe-doped TiO2(Fe/TiO2) film photocatalyst was prepared by sol-gel and dip-coating process to extend its photoresponsivity to the visible spectrum. To promote the CO2reduction performance with the photocatalyst, some types of base materials used for coating Fe/TiO2, which were netlike glass fiber and Cu disc, were investigated. The characterization of prepared Fe/TiO2film coated on netlike glass fiber and Cu disc was analyzed by SEM and EPMA. In addition, the CO2reduction performance of Fe/TiO2film coated on netlike glass disc, Cu disc, and their overlap was tested under a Xe lamp with or without ultraviolet (UV) light, respectively. The results show that the concentration of produced CO increases by Fe doping irrespective of base material used under the illumination condition with UV light as well as that without UV light. Since the electron transfer between two overlapped photocatalysts is promoted, the peak concentration of CO for the Fe/TiO2double overlapping is approximately 1.5 times as large as the Fe/TiO2single overlapping under the illumination condition with UV light, while the promotion ratio is approximately 1.1 times under that without UV light.

scholarly journals Impact of Pd Loading on CO2 Reduction Performance over Pd/TiO2 with H2 and H2O

Molecules ◽  
2020 ◽  
Vol 25 (6) ◽  
pp. 1468
Author(s):  
Akira Nishimura ◽  
Tadaaki Inoue ◽  
Yoshito Sakakibara ◽  
Masafumi Hirota ◽  
Akira Koshio ◽  
...  
Keyword(s):  
Tio2 Film ◽  
Uv Light ◽  
Sol Gel ◽  
Co2 Reduction ◽  
Dip Coating ◽  
Unit Weight ◽  
Molar Ratio ◽  
Illumination Condition ◽  
The Impact ◽  
Lamp Illumination

This study investigated the impact of molar ratio of CO2 to reductants H2O and H2, as well as Pd loading weight on CO2 reduction performance with Pd/TiO2 as the photocatalyst. The Pd/TiO2 film photocatalyst is prepared by the sol-gel and dip-coating process to prepare TiO2 film and the pulse arc plasma method is used to dope Pd on TiO2 film. The prepared Pd/TiO2 film was characterized by SEM, EPMA, STEM, EDS, and EELS. This study also investigated the performance of CO2 reduction under the illumination condition of Xe lamp with or without ultraviolet (UV) light. As a result, it is revealed that when the molar ratio of CO2/H2/H2O is set at 1:0.5:0.5, the best CO2 reduction performance has been obtained under the illumination condition of Xe lamp with and without UV light. In addition, it is found that the optimum Pd loading weight is 3.90 wt%. The maximum molar quantities of CO and CH4 produced per unit weight of photocatalyst are 30.3 μmol/g and 22.1 μmol/g, respectively, for the molar ratio of CO2/H2/H2O = 1:0.5:0.5 under the condition of Xe lamp illumination with UV light. With UV light, C2H4 and C2H6, as well as CO and CH4 are also produced by the Pd/TiO2 film photocatalyst prepared in this study.

scholarly journals Effect of Fe Loading Condition and Reductants on CO2 Reduction Performance with Fe/TiO2 Photocatalyst

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Akira Nishimura ◽  
Noriaki Ishida ◽  
Daichi Tatematsu ◽  
Masafumi Hirota ◽  
Akira Koshio ◽  
...  
Keyword(s):  
Loading Condition ◽  
Uv Light ◽  
Sol Gel ◽  
Co2 Reduction ◽  
Base Material ◽  
Dip Coating ◽  
Pulse Number ◽  
Light Illumination ◽  
Arc Plasma ◽  
Tio2 Photocatalyst

Fe-doped TiO2 (Fe/TiO2) film photocatalyst was prepared by sol-gel and dip-coating process and pulse arc plasma method. The effect of pulse number on the CO2 reduction performance with the Fe/TiO2 was investigated in this study. In addition, the effect of reductants such as H2O, H2, and NH3/H2O on the CO2 reduction performance with the Fe/TiO2 photocatalyst was also investigated. The characteristics of the prepared Fe/TiO2 film coated on a netlike glass fiber which is a base material were analyzed by SEM, EPMA, EDX, and EPMA. Furthermore, the CO2 reduction performance of the Fe/TiO2 film was tested under a Xe lamp with or without ultraviolet (UV) light. The results show that the CO2 reduction performance with the pulse number of 100 is the best with H2O and/or H2 as reductant under UV light illumination, while that with the pulse number of 500 is the best when NH3/H2O is used as reductant. On the other hand, the CO2 reduction performance with the pulse number of 500 is the best under every reductant condition without UV light illumination. The highest CO2 reduction performance with the Fe/TiO2 is obtained under H2 + H2O/CO2 condition, and the best moral ratio of total reductants to CO2 is 1.5 : 1.

scholarly journals Reforming Characteristics under Visible Light Response of Cr- or Ag-Doped Prepared by Sol-Gel and Dip-Coating Process

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Akira Nishimura ◽  
Go Mitsui ◽  
Katsuya Nakamura ◽  
Masafumi Hirota ◽  
Eric Hu
Keyword(s):  
Visible Light ◽  
Uv Light ◽  
Sol Gel ◽  
Light Response ◽  
Dip Coating ◽  
Coating Process ◽  
Ag Doping ◽  
Visible Light Response ◽  
Cr Doping ◽  
Doping Case

A Cr- or Ag-doped TiO2film was prepared by sol-gel and dip-coating process and used as the photocatalyst for CO2reforming under the visible light. The ratio of amount of Cr or Ag added to amount of Ti in TiO2sol solution (R) varied from 0 to 100 wt% or 0 to 50 wt%, respectively. The total layer number of Cr- or Ag-doped TiO2film (N) coated was changed. The CO2reforming performance with the Cr- or Ag-doped TiO2film was tested under a Xe lamp with or without ultraviolet (UV) light. As a result, whenNequals to 1, the concentration of CO which was a product from CO2reforming was maximized in Cr doping case forR= 70 wt% and in Ag doping case forR= 1 wt%, respectively. The best result of concentration of CO = 8306 ppmV, concentration of CH4= 1367 ppmV, concentration of C2H6= 1712 ppmV is obtained when with Cr doping in this study.

Crystallization and Photoactivity of Tio2Films Formed on Soda Lime Glass by a Sol-Gel Dip-Coating Process

2005 ◽  
Vol 192 (3) ◽  
pp. 327-335 ◽  
Author(s):  
Seung Hun Oh ◽  
Jae Seong Kim ◽  
Jin Suk Chung ◽  
Eui Jung Kim ◽  
Sung Hong Hahn
Keyword(s):  
Sol Gel ◽  
Soda Lime ◽  
Dip Coating ◽  
Soda Lime Glass ◽  
Coating Process

Changes of thickness and refractive index of silica sol-gel film by dip coating process

2014 ◽  
Vol 26 (7) ◽  
pp. 72005
Author(s):  
张日东 Zhang Ridong ◽  
严鸿维 Yan Hongwei ◽  
吕海兵 Lü Haibing ◽  
张尽力 Zhang Jinli ◽  
晏良宏 Yan Lianghong ◽  
...  
Keyword(s):  
Refractive Index ◽  
Sol Gel ◽  
Dip Coating ◽  
Silica Sol ◽  
Coating Process ◽  
Gel Film

scholarly journals Sol-Gel Synthesis of TiO2/SiO2 and ZnO/SiO2 Composite Films and Evaluation of Their Photocatalytic Activity towards Methyl Green

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
V. L. Chandraboss ◽  
B. Karthikeyan ◽  
J. Kamalakkannan ◽  
S. Prabha ◽  
S. Senthilvelan
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Sol Gel ◽  
Composite Films ◽  
Dip Coating ◽  
Methyl Green ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Coating Method ◽  
Dip Coating Method

The TiO2/SiO2 and ZnO/SiO2 composite films were prepared by sol-gel dip coating method. The surface morphology and crystal structure of thin films were characterized by means of scanning electron microscopy (SEM) with elementary dispersive X-ray analysis (EDX) and X-ray diffractometer (XRD). Optical properties of films have been investigated using ultraviolet and visible spectroscopy (UV-visible spectroscopy). The photocatalytic activity was established by testing the degradation and decolorization of methyl green (MG) from aqueous solution with artificial UV-light.

Zinc Oxide Thin Film Synthesized by Sol-Gel Method

2020 ◽  
Vol 307 ◽  
pp. 51-57
Author(s):  
Amna Afiqah Nasution Hakim ◽  
Affa Rozana Abdul Rashid ◽  
N. Arsad ◽  
Aisyah Hanim Surani
Keyword(s):  
Thin Film ◽  
Uv Light ◽  
Zinc Acetate Dihydrate ◽  
Sol Gel ◽  
Dip Coating ◽  
Oxide Thin Film ◽  
Gel Method ◽  
Sol Gel Method ◽  
Crystallite Sizes ◽  
Surface Morphologies

ZnO thin films have been prepared by the dip coating sol gel method. Zinc acetate dihydrate, 2-methoxyethanol and monoethanolamine (MEA) were used as precursor, solvent and stabilizer respectively. The synthesized sample was coated on glass substrate as the molarity of the solution was kept constant at 0.1 M. The structural properties and surface morphologies of ZnO thin film were characterized by XRD and FESEM. The optical properties such as transmittance, absorbance, reflectance and refractive index were studied by using UV-Vis. The functional group of the synthesized sample were verified by using FTIR. Average crystallite sizes of the samples were calculated by using Debye-Scherrer's formula. Next, ZnO is coated on POF in order to examine the reaction towards UV light.

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