銀鉭系波洛斯凱特型與二氧化鈦光觸媒用於二氧化碳光催化還原反應之效能-光觸媒物性和光學性質之鑑定及光催化活性之初步測定-

林業騫

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銀鉭系波洛斯凱特型與二氧化鈦光觸媒用於二氧化碳光催化還原反應之效能-光觸媒物性和光學性質之鑑定及光催化活性之初步測定-

The Preformance of Ag-Ta Perovskite-type and Titania Photocatalysts for Photocatalytic Reduction of Carbon Dioxide-Characterization of Physical and Photochemical Preliminary Tests of Photocatalytic Activity-

林業騫 , Masters　　Advisor：翁鴻山　　

繁體中文

二氧化鈦；鉭酸銀；溶膠凝膠法；二氧化碳光催化還原反應； AgTaO3 ； TiO2 ； sol-gel method ； photoreduction of CO2

Abstract │ Reference (61) │ Times Cited (2) │ Altmetrics

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The main objective of this study is to develop a photocatalyst with high activity for the photocatalytic reduction of carbon dioxide (CO2). The photocatalysts prepared include AgTaO3 (perovskite type catalyst) and titania, Both the photocatalysts were prepared by sol-gel method and were further loaded with Cu and Ni. On the other hand, loading CuO and NiO on self-made catalysts and commercial titania were prepared by impregnation method. The physical and photochemical properties of catalysts were characterized by XRD, UV-Vis, PL, SEM and TEM.
    The results of X-ray diffraction indicate that perovskite-type AgTaO3 has a good crystal phase at different calcination temperatures and different metal contents loaded by sol-gel method. UV-vis spectra show that the band gaps of AgTaO3 and TiO2 were 3.35 eV and 3.02 eV, respectively. In addition, AgTaO3 and TiO2 loaded with CuO by sol-gel method caused absorption edge extends to longer wavelengths and increased the light absorption in visible region. PL spectra indicate that adding metal to catalysts would cause defect and distortion, Existence of energy levels in gaps which could trap electrons and hence leaded to lower recombination of electrons and holes.
     Although some valuable results were obtained from the characterization of photocatalysts, and methanol was identified in the CO2 photocatalytic reduction and CO2 transforming into hydrocarbons was confirmed as well, however the conversion of CO2 was too low and reproducibility was not good enough. These facts might be due to improper installations and operation of the reactor system. Hence we could not compare the performance of various photocatalysts.

Reference ( 61 ) 〈TOP〉

Development of Visible-light-driven Photocatalysts for
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[9]P. W. Pan, Y. W. Chen, Catal. Commun.,8,1546 (2007).
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[13]H. Kato, H. Kobayashi and A. Kudo, J. Phys. Chem. B, 106, 12441 (2002).
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[14]J. Livage and C. Sanchez, “Sol-Gel Chemistry”, J. Non-Cryst . Solids, 145 ,11 (1992).
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