標題: 以氣相法製備氮摻雜之可見光觸媒/中孔洞分子篩複合材料同時處理VOCs及NOx之研究
Composites of N-doped TiO2 Photocatalyst and Mesoporous Silica Particles for the Simultaneous Removals of NOx and VOCs
作者: 陳祈緯
Chen, Chi-Wei
白曛綾
Bai, Hsun-ling
環境工程系所
關鍵字: 氮摻雜二氧化鈦;中孔洞分子篩;可見光催化;氮氧化物;揮發性有機物;N-doped TiO2;mesoporous silica particles;vible light photocatalysis;NOx;VOCs
公開日期: 2009
摘要: 由於氮摻雜二氧化鈦(N-TiO2)光觸媒在可見光照射下有光催化之效果,而中孔洞分子篩(mesoporous silica particles,MSP)材料可作為吸附劑使用,因此,本研究以機械混合方式製備N-TiO2/MSP複合材料,結合兩者之特性可同時去除空氣中之VOCs與NOx等污染物,並改善傳統吸附劑之除污能力,達到同時吸附與光催化之目標。實驗所製備之複合材料,經由XRD、DRS UV-Vis、SEM、TEM等儀器進行特性分析。而實驗的進行是利用可見光光源,分別以Acetone與NO做為VOCs與NOx之來源,並以連續式反應器測試Acetone與NO之濃度變化情形。實驗結果發現,製備N-TiO2時之TTIP/H2O前驅物體積流率比為4時,N-TiO2/MSP複合材料有較佳的Acetone與NO光催化效能;且其相較於N-TiO2/ZSM-5與ST-01/MSP複合材料,亦有較佳之光催化效能;在改變不同重量比之N-TiO2/MSP複合材料時,發現N-TiO2(60)/MSP之重量比有最佳Acetone與NO之除污效能。本實驗亦改變不同停留時間、NO濃度等實驗條件,以瞭解各參數之影響。對於N-TiO2(60)/MSP複合材料探討個別處理Acetone與NO和同時處理Acetone與NO之研究,並改變不同Acetone之濃度,探討其對NO去除之影響,並同時探討NO2選擇率與硝酸形成機率。另一方面,對於N-TiO2光觸媒樣品而言,發現兩種污染物共存時之處理效能會低於個別存在時之情況,為一競爭去除關係;而當N-TiO2與MSP結合時,兩者互為協同去除關係,即兩種污染物共存時之處理效能會高於個別存在時之情況。
The purpose of this study is to understand continuous and simultaneous removals of acetone solvent vapors and NO under visible light at room temperature over N-TiO2/MSP composite. It can achieve the goal that N-TiO2/MSP composite can adsorb the pollutants on the surface and then photocatalytically decompose the pollutants subsequently. The catalyst are characterized by XRD、UV-vis、SEM、TEM and FTIR analysis. The simultaneous abatement of acetone and NO pollutants was carried out using a continuous flow reactor system under fluorescent lamps. The results show that the best N-TiO2 can be abtained at TTIP/H2O volumetric flow rate ratio of 4 is more effective than other ratios. For simultaneous removal of acetone and NO, the 60/40 mass ratio of N-TiO2/MSP composite shows the highest acetone and NO removals. For pure N-TiO2 photocatalyst, the coexistence of acetone and NO shows the competition effect. On the other hand, for the test of N-TiO2/MSP composite, the coexistence of acetone and NO shows coordinated dependent or competition effect.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT079619516
http://hdl.handle.net/11536/42389
顯示於類別:畢業論文


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  1. 951601.pdf