在可見光下進行超音波光催化降解酚

Sonophotocatalytic Degradation of Phenol under Visible Light Irradation

尤志文(Chih -Wen Yu)

指導教授 ： 王榮基

大同大學/工程學院/化學工程學系所/碩士(2010年)

摘要

本研究主要探討操作在可見光下結合超音波在玻璃反應器內進行超音波光催化反應降解酚。利用Sol-Gel 法製備0.5% ZnFe2O4/TiO2固定在粒狀活性碳(GAC)作為一種能階較低的改質二氧化鈦光觸媒並藉由XRD、SEM-EDS、BET 以測定製備的可見光光觸媒性質。
相對於可見光催化的實驗結果，超音波光催化系統顯示出更良好的降解酚效果。超音波的加入對於光催化降解酚有加乘效果。反應動力式經由擬一階動力式表示濃度與時間的關係，降解速率會受到液相酚的起始酸鹼值、鹽類的添加以及不同氣體輸入的影響。回收後的光觸媒，其可見光光催化降解酚之特性，會隨回收次數之增加而遞減。

關鍵字

可見光 ； 超音波光催化 ； 酚降解 ； 二氧化鈦

並列摘要

The sonophotocatalytic degradation of phenol under visible light irradiation combined with ultrasound was carried out in a glass reactor.
0.5%ZnFe2O4/TiO2-GAC was employed as the lower band gap photocatalysts which were obtained by sol-gel process and characterized by spectroscopic X-ray diffraction (XRD), scanning electron microscopy with energy dispersive X-ray microanalyses (SEM-EDX) and Brunauer-Emmett-Teller sorptometer (BET). Sonophotocatalytic degradation of phenol has synergistic effect for phenol degradation in comparison with photocatalytic reaction. The kinetic law for the sonophotocatalytic degradation is determined to apparently the pseudo first-order with respect to the concentration of phenol. The rates of sonophotocatalytic degradation are affected by the initial phenol pH value, salts addition, and gas supplying. The characteristics of photocatalysis under visible light irradiation would be reduced with the recycling time of the recovered photocatalyst.

並列關鍵字

Visible light ； Sonophotocatalysis ； Phenol degradation ； TiO2

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