二氧化鈦分散於海綿狀碳化矽氧化鋁載體及其光降解效率的研究

TITANIUM DIOXIDE COATED ON SPONGE-SHAPED SiC, Al2O3 AND THEIR PHOTOCATALYTIC PERFORMANCE

吳弘舜(Hung-shun Wu)

指導教授 ： 林永仁

大同大學/工程學院/材料工程學系所/碩士(2011年)

摘要

本研究用聚氨酯(PU)海綿為模板製備成碳化矽、氧化鋁、酚醛樹酯碳作為觸媒載體，以溶膠凝膠法和二氧化鈦粉末(P25)含浸法將二氧化鈦(TiO2)披覆在載體上，分別製備成TiO2/SiC、TiO2/Al2O3 及TiO2/C 載體觸媒。另外將P25 粉末摻雜氮以增加在可見光波段的吸收。藉由SEM 觀察不同載體表面，利用XRD 研究二氧化鈦與載體的結晶型態，UV-ViS 測量能隙變化，並進行紫外光及可見光催化亞甲基藍水溶液，分析載體光觸媒的亞甲基藍降解率。實驗結果發現，三種二氧化鈦粉末在紫外光下以P25 降解亞甲基藍降解率最佳，而製備出的海綿狀碳化矽載體表面呈凸起狀，披覆TiO2 於碳化矽之P25/SiC 載體觸媒有最高的亞甲基藍降解率，碎屑狀solgel/SiC 因為受光面積大於網狀，使降解亞甲基藍降解率優於網狀solgel/SiC 載體觸媒，同時因為內電子傳遞效應使降解亞甲基藍降解率也優於solgel粉末。另外藉由氮摻雜改質P25 粉末，可提高光觸媒在可見光下的吸收。

關鍵字

網狀結構 ； 觸媒載體 ； 碳化矽 ； 二氧化鈦 ； 聚氨酯海綿

並列摘要

Poly-urethane sponge was used as templates to fabricate porous SiC,Al2O3 and phenolic-resin derived carbon. These pourous ceramic were then coated with sol-gel TiO2 and TiO2 powder(P25) to form TiO2/SiC,TiO2/Al2O3 and TiO2/C supported photo-catalysts. P25 powder was also doped with N in attempt to increase the adsorption of visible light. Surface morphology was observed in SEM, Crytal structure was identified with XRD, photo-catalysts performance was evaluated by the degradation of methylene blue solution. The result showed that:P25-TiO2/SiC has the best methylene blue degradation performance. Among the supported TiO2 catalysts. In addition, P25 is the better powder-form photocatalyst than the sol-gel derived. After N-doping , P25 can be increased in the adsorption of visible light.

並列關鍵字

TiO2 ； Poly-urethane sponge ； SiC

參考文獻

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