石墨烯複合二氧化鈦光電催化降解染料之研究

Photoelectrocatalytic Degradation of Dyes using Graphene Composite Titanium Dioxide Electrodes

田照正(Chao-Cheng Tien)

指導教授 ： 王文裕

朝陽科技大學/理工學院/環境工程與管理系/碩士(2014年)

摘要

本研究以超音波輔助Hummers法製備氧化石墨烯，以循環伏安法進行氧化石墨烯的電沉積，並還原於二氧化鈦奈米管陣列膜上，製備出石墨烯複合二氧化鈦奈米管陣列膜。用不同光源作比較，以光電催化進行染料溶液去除效率之影響研究，並且以開路電壓，閉路電流，交流阻抗進行電化學分析。本研究結果顯示石墨烯複合二氧化鈦奈米管陣列膜在紫外光照射下，其染料降解效率比二氧化鈦奈米管陣列膜效果佳；外加偏壓1 V下，加入0.1 M的氯化鉀溶液，有最佳的光電催化降解效率；在甲基橙溶液濃度提高至30 mg/L下仍有良好的降解效率。相對於二氧化鈦奈米管陣列膜，石墨烯複合二氧化鈦奈米管陣列膜之光電流有提升，與染料降解效率之提升相呼應，証實石墨稀複合之二氧化鈦奈米管陣列膜可提升整體反應效率。同樣地，甲基橙溶液的可見光光催化與光電催化反應顯示，石墨烯複合二氧化鈦奈米管陣列膜，比二氧化鈦奈米管陣列膜的催化能力強。

關鍵字

光電催化 ； 石墨稀 ； 二氧化鈦

並列摘要

The ultrasonic and Hummers method were used in this study to prepare graphene oxide. The cyclic voltammetry was used for reduction of graphene oxide to graphene and deposition of graphene on the TiO2 nanotube array film. Thus, the graphene composited TiO2 nanotube array film was prepared. The photoelectrocatalysis of dye solution and its degradation efficiency was implemented with visible light and UV. The open-circuit voltage, closed circuit current and AC impedance of electrochemical analysis were implemented. The results showed that the dye degradation efficiency of the graphene composite TiO2 nanotube array film in UV-irradiation is better than that of TiO2 nanotube array film. With bias of 1 V, the addition of 0.1 M potassium chloride resulted in the optimum photoelectrocatalytic degradation efficiency. The degradation efficiency is still good when the methyl orange solution concentration is increased to 30 mg/L. The photocurrent of graphene composite TiO2 nanotube array film was increased compared with TiO2 nanotube array film. The results proving that the graphene composite TiO2 nanotube array film can increase the overall photoelectrocatalytic efficiency. In the same way, photocatalysis and photoelectrocatalysis of methyl orange solution with the visible light showed that the graphene composite TiO2 nanotube array film also has better catalytic efficiency than TiO2 nanotube array film.

並列關鍵字

photoelectrocatalysis ； Graphene ； TiO2

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