Study on Carbon-modified Titania and its Visible-light-responsive Photocatalytic Activity

碩士 === 國立臺灣科技大學 === 化學工程系 === 98 === In this research, the carbon-modified titanium dioxide (TiO2) photocatalyst was prepared by impregnation method for the improvement in its visible-light response. This simple process of preparation of visible-light-responsive photocatalyt can be applied for mass...

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Main Authors: Chien-Hung Kuo, 郭建宏
Other Authors: Yao-Hsuan Tseng
Format: Others
Language:zh-TW
Published: 2010
Online Access:http://ndltd.ncl.edu.tw/handle/33110910052805285318
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spelling ndltd-TW-098NTUS53420352016-04-22T04:23:47Z http://ndltd.ncl.edu.tw/handle/33110910052805285318 Study on Carbon-modified Titania and its Visible-light-responsive Photocatalytic Activity 碳改質二氧化鈦及其可見光應答催化活性之研究 Chien-Hung Kuo 郭建宏 碩士 國立臺灣科技大學 化學工程系 98 In this research, the carbon-modified titanium dioxide (TiO2) photocatalyst was prepared by impregnation method for the improvement in its visible-light response. This simple process of preparation of visible-light-responsive photocatalyt can be applied for mass production. The amount of added carbon, calcination temperature and the different sintering atmosphere in the preparation process were investigated by the study on the effects of parameters in photoactivity. Moreover, the stability of photocatalysts were examined by the long-term ultraviolet irradiation. In the experiment, the physical properties and photocatalytic activities of carbon-modified TiO2 were both investigated. Physical properties of materials were determined by Ultraviolet-Visible Molecular Absorption Spectrometry diffuse-reflectance spectrometry (UV-Vis-DRS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), turbidity, photoluminescence (PL) spectroscopy, scanning electron microscopy (SEM), Raman spectroscopy, Infrared spectroscopy diffuse-reflectance spectrometry (IR-DRS), Brunauer–Emmett–Teller (BET) adsorption analysis. These results indicate the differences among the prepared samples in the surface structure, composition, functional groups, light absorption range, and recombination rate of photoexcited electron and hole. The photocatalytic activity was evaluated in the degradation of gaseous NOx and decolorization of aquatic methyl orange under the irradiation of UV and visible light. The results show that the photocatalytic activities of TiO2 under irradiation of UV and visible light can be greatly enhanced with the addition of an appropriate amount of alcohols in the impregnation procedure. Moreover, the carbonaceous species on TiO2 surface can retard the formation of hazardous intermediate, NO2, in the photo-oxidative reaction of NOx-degradation. The carbon-modified TiO2 also exhibits the better activity than bare TiO2 in the decolorization of methyl orange. The proper carbonaceous structure on TiO2 surface is formed under calcaination at 200 oC in air atmosphere, which exhibits a good visible-light absorbance. It will be vanished as the heating temperature is over 300 oC and long-term UV irradiation is applied. Although the adsorption of dye will increase with the increase of amount of carbonaceous species on TiO2, the active site of TiO2 will be covered with adding excess amount of alcohol. The visible-light- responsive carbonaceous species is not generated under N2 atmosphere due to absence of oxygen. The reasons for the improvement of photocatalytic activity with carbon-modification are attributed to less the recombination rate of photoexcited electron and hole, narrow the band gap, increase the adsorption of dye, and increase the degree of dispersion of TiO2 particle in water, evidenced from the physical characterization and chemical reactions. Yao-Hsuan Tseng 曾堯宣 2010 學位論文 ; thesis 174 zh-TW
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language zh-TW
format Others
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description 碩士 === 國立臺灣科技大學 === 化學工程系 === 98 === In this research, the carbon-modified titanium dioxide (TiO2) photocatalyst was prepared by impregnation method for the improvement in its visible-light response. This simple process of preparation of visible-light-responsive photocatalyt can be applied for mass production. The amount of added carbon, calcination temperature and the different sintering atmosphere in the preparation process were investigated by the study on the effects of parameters in photoactivity. Moreover, the stability of photocatalysts were examined by the long-term ultraviolet irradiation. In the experiment, the physical properties and photocatalytic activities of carbon-modified TiO2 were both investigated. Physical properties of materials were determined by Ultraviolet-Visible Molecular Absorption Spectrometry diffuse-reflectance spectrometry (UV-Vis-DRS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), turbidity, photoluminescence (PL) spectroscopy, scanning electron microscopy (SEM), Raman spectroscopy, Infrared spectroscopy diffuse-reflectance spectrometry (IR-DRS), Brunauer–Emmett–Teller (BET) adsorption analysis. These results indicate the differences among the prepared samples in the surface structure, composition, functional groups, light absorption range, and recombination rate of photoexcited electron and hole. The photocatalytic activity was evaluated in the degradation of gaseous NOx and decolorization of aquatic methyl orange under the irradiation of UV and visible light. The results show that the photocatalytic activities of TiO2 under irradiation of UV and visible light can be greatly enhanced with the addition of an appropriate amount of alcohols in the impregnation procedure. Moreover, the carbonaceous species on TiO2 surface can retard the formation of hazardous intermediate, NO2, in the photo-oxidative reaction of NOx-degradation. The carbon-modified TiO2 also exhibits the better activity than bare TiO2 in the decolorization of methyl orange. The proper carbonaceous structure on TiO2 surface is formed under calcaination at 200 oC in air atmosphere, which exhibits a good visible-light absorbance. It will be vanished as the heating temperature is over 300 oC and long-term UV irradiation is applied. Although the adsorption of dye will increase with the increase of amount of carbonaceous species on TiO2, the active site of TiO2 will be covered with adding excess amount of alcohol. The visible-light- responsive carbonaceous species is not generated under N2 atmosphere due to absence of oxygen. The reasons for the improvement of photocatalytic activity with carbon-modification are attributed to less the recombination rate of photoexcited electron and hole, narrow the band gap, increase the adsorption of dye, and increase the degree of dispersion of TiO2 particle in water, evidenced from the physical characterization and chemical reactions.
author2 Yao-Hsuan Tseng
author_facet Yao-Hsuan Tseng
Chien-Hung Kuo
郭建宏
author Chien-Hung Kuo
郭建宏
spellingShingle Chien-Hung Kuo
郭建宏
Study on Carbon-modified Titania and its Visible-light-responsive Photocatalytic Activity
author_sort Chien-Hung Kuo
title Study on Carbon-modified Titania and its Visible-light-responsive Photocatalytic Activity
title_short Study on Carbon-modified Titania and its Visible-light-responsive Photocatalytic Activity
title_full Study on Carbon-modified Titania and its Visible-light-responsive Photocatalytic Activity
title_fullStr Study on Carbon-modified Titania and its Visible-light-responsive Photocatalytic Activity
title_full_unstemmed Study on Carbon-modified Titania and its Visible-light-responsive Photocatalytic Activity
title_sort study on carbon-modified titania and its visible-light-responsive photocatalytic activity
publishDate 2010
url http://ndltd.ncl.edu.tw/handle/33110910052805285318
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