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標題: 利用UV/TiO2光觸媒催化降解酸性染料AR1廢水之研究
Photocatalytic degradation of acid red 1 dye by using UV/TiO2 photocatalysts
作者: 黃筠雅
Huang, Yun-Ya
關鍵字: 光觸媒;photocatalyst;偶氮染料;AR1;溶膠凝膠;紫外光光催化;azo dyes;AR1;sol-gel;UV/TiO2 photocatalysts
出版社: 環境工程學系所
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實驗首先探討影響溶膠凝膠法之製備參數,結果顯示在製備條件為pH2、pH7及 pH10時,其粒徑大小和分散性最佳,平均粒徑約在6~7 nm左右,而pH5之粒徑較大約13~14 nm左右。當溶膠pH值為2時,二氧化鈦的結晶相態包含金紅石、銳鈦礦與板鈦礦;當溶膠溶液pH值提升至5時,板鈦礦將轉變為金紅石;當凝膠溶液的pH值> 7時,二氧化鈦的結晶相態由金紅石轉變成銳鈦礦,顯示凝膠溶液之pH會顯著影響二氧化鈦的結晶相態。

In this study, the laboratory prepared TiO2 was used for photocatalytic degradation of acid red 1 dye. The photocatalyst TiO2 was prepared by the sol-gel method, including hydrolysis, condensation and calcination procedures. A series of Pt/TiO2 catalysts was synthesized by ‘‘pH-adjusting’’ and “Pt-loading” aiming to evaluate the effect of pH value of sol and Pt incorporation on their crystalline phase, crystalline size and catalytic properties. The calcined photocatalysts were characterized by FE-SEM、XRD、BET and PL analysis, and applied in photocatalytic degradation of AR1 dye.
It was found that the incorporation of Pt and adjusting of sol pH value during the TiO2 preparation procedure has a positive effect on the structural and textural characteristics of catalysts. When the sol pH was 2, 7, and 10, the crystalline size of 0.2 wt% Pt/TiO2 was smaller about 6~7 nm, while the crystalline size was increased to 13~14 nm when the sol pH was controlled at 5.
For crystalline phase, when the sol pH was 2, the main composition of TiO2 was anatase, rutile and brooks. As the pH increased to 5, the brooks phase was transferred to rutile phase. When the sol at high pH (7 and 10), the main crystalline phase of Pt/TiO2 was anatase. Dye degradation experiments results showed that with 89.22% of the mixed anatase crystalline phase of titanium dioxide photocatalyst has the best photocatalytic degradation efficiency, which proven that a mixed crystalline titania phase benefits for photocatalytic degradation.
其他識別: U0005-1808201311111800
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