Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/91643
標題: 以多元醇法製備TiO2光觸媒降解AR1染料之研究
Photocatalytic degradation of AR1 dye using TiO2 photocatalyst prepared by polyol method
作者: Wen-Ying Li
李文英
關鍵字: 光觸媒
偶氮染料
二氧化鈦
多元醇法
Photocatalyst
azo dyes
titanium dioxide
polyol method
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摘要: 近年來隨著環保意識的抬頭,人們也愈來愈重視人體健康、地球環境和生態保護,如何有效減少污染物的產生,是現今社會重要的課題。應用於移除廢水中汙染物的去除方法主要是以光觸媒氧化法為主,而在光觸媒氧化法中,又以二氧化鈦最常被使用,這是由於二氧化鈦本身較其他光觸媒便宜、穩定、具強氧化能力、化學惰性及生物惰性。因此,本研究使用多元醇法製備二氧化鈦光觸媒,並探討以多元醇法製備奈米粉體的製程參數及不同鍛燒溫度對型態結構及分解偶氮染料之影響。 本實驗中,在製程中添加TTIP做為前驅物,並以PVP做為保護劑,探討不同鍛燒溫度及在不同的pH值條件下,以改變TiO2光觸媒的晶相組成與晶粒尺寸,與目標汙染物 AR1進行光催化反應。實驗中,將以TGA、XRD、FE-SEM、UV/vis特性分析來協助光觸媒之物化特性分析,觀察光觸媒表面、晶相及孔洞結構等特性分析。由於二氧化鈦本身能隙為3.0~3.2 eV,其被歸類在紫外光吸收波段,因此在本實驗中探討所製備之光觸媒在紫外光(365nm)的照射之下降解染料AR1之效果。 研究結果顯示,在鍛燒T550時為最佳之脫色效果,其含銳鈦礦35%混合比例之結晶相態的二氧化鈦光觸媒,也證實二氧化鈦之混合結晶相態對光催化具有增效作用。為了進一步提升染料被分解的成效,期望使用多元醇法來合成具高分散性之TiO2觸媒,透過這樣的程序提升染料在相同反應下被分解之成效。
Owing to rising awareness of environmental protection in recent years, more and more people pay attention to the human health, global environment and ecological preservation. How to decrease pollutants effectively is an important issue nowadays. The photocatalytic oxidation is the major method for removal of pollutant from waste water. In this method, titanium dioxide(TiO2)is the most common photocatalyst to use. Because of it’s cheaper, stability, strong oxidizing ability, chemically inert and biologically inert than others. In this study, we used the polyol method to prepare TiO2, and investigate the effects of crystal phase and crystal size on the photocatalytic degradation of azo dyes by using the different preparation parameters and calcination temperature. In this preparation process, we added TTIP as precursor and PVP as a protective agent, and used calcineration temperature to change the composition and particle size of TiO2. The obtained photocatalystwas then processed the photocatalytic reaction with target pollutant-acid red 1 (AR1). The characterization of photocatalyst was carried out by TGA, XRD, FE-SEM and UV/vis analysis to get the properties of thermal properties, crystal strucutre, morphology, and UV light adosrpiton character, respectively. TiO2 has band gaps of 3.0-3.2 eV, it’s classified to UV absorption bands. So we also assessed the photocatalyst under UV light(365nm)to decompose azo dyes(AR1). In conclusion, calcination temperature of 550 oC is the best condition which results in the crystalline TiO2 mixed with 35% anatase and 65% rutile. This proves mixed-crystalline TiO2 results in increasing photocatalysis reactions. Therefore, polyol method could be expedted a suitable method to synthesis a high activity TiO2.
URI: http://hdl.handle.net/11455/91643
文章公開時間: 2017-08-20
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