Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/5824
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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摘要: 本研究使用本實驗室製備之光觸媒進行染料光催化降解試驗,其製備方法係採用溶膠凝膠法經由水解、縮合及鍛燒等程序製備而得。製備過程中將調整溶膠pH值及披覆鉑金屬,以改變TiO2光觸媒的晶相組成與晶粒尺寸。於本研究中,將以FE-SEM、XRD、BET及PL等儀器分析,觀察光觸媒表面型態、晶相特性、孔洞結構等特性,並將其應用於偶氮染料AR1的光催化降解程序中。 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。 染料降解實驗結果則顯示,含銳鈦礦89.22%混合比例之結晶相態的二氧化鈦光觸媒,光催化降解效率為最佳,這也證實二氧化鈦之混合結晶相態對光催化具有增效作用。
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.
URI: http://hdl.handle.net/11455/5824
其他識別: U0005-1808201311111800
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-1808201311111800
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