具可見光吸收能力之二氧化鈦/奈米碳管複合材其光催化性質鑑定

Photocatalytic Characterization of Visible Light Activatable TiO2/Carbon Nanotubes Composites

羅琨元(Kun-Yuan Lo)

指導教授 ： 徐文光

國立清華大學/工學院/材料科學工程學系/碩士(2010年)

摘要

本實驗以溶膠凝膠法使奈米碳管(以下簡稱碳管。)表面均勻包覆一層銳鈦礦相(Anatase)二氧化鈦。藉電子顯微鏡、X光繞射分析等方式確認其成分與結構，光譜分析(紫外光-可見光光譜、螢光光譜)驗證其光反應性。藉光降解(Photodegradation)實驗，我們找出最佳的碳管與二氧化鈦比例，並發現無論在紫外光或可見光下，降解能力均優於Degussa Aeroxide® P25。
碳管擁有卓越的導電性，因此二氧化鈦上被激發的光電子易傳導到碳管上，延長了再結合的時間，使二氧化鈦活性增加；此外，碳管的高比表面積，使複合材展現良好的吸附性，在光降解亞甲基藍反應上有優異的表現。

關鍵字

奈米碳管 ； 二氧化鈦 ； 光觸媒 ； 可見光

並列摘要

Carbon nanotubes are uniformly coated with titanium dioxide by sol-gel technique. Morphology, composition, and photoreactivity of the as-made composite are investigated by electron microscopy, X-ray diffraction, UV-Visible spectrum, and Photoluminescence spectroscope data, respectively. The composites show a superior efficiency of photocatalysis than Degussa Aeroxide® P25 in photo-degradation experiment.
Due to the excellent conductivity of carbon nanotubes, the photoelectron excited in titanium dioxide can be easily transferred to carbon nanotubes. As a result, the recombination kinetic of exciton is prolonged, and the photocatalysis of titanium dioxide is improved. Moreover, the high specific surface area of carbon nanotubes provides substantial amount of adsorption sites and therefore improve performance of photo-degradation experiment.

並列關鍵字

carbon nanotube ； titanium dioxde ； photocatalyst ； visible light

參考文獻

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