?燒溫度對二氧化鈦光電催化降解染料之影響

Effect of Calcination Temperature on Photoelectrocatalytic Degradation of Dyes using Titanium Dioxide Electrodes

莊雍帆(Yung-fan Chuang)

指導教授 ： 王文裕

朝陽科技大學/理工學院/環境工程與管理系在職專班/碩士(2010年)

摘要

本研究利用兩種不同電解液製備之二氧化鈦奈米管膜，以及鈦板直接?燒氧化的二氧化鈦膜，以光電催化進行染料去除效率之影響研究；以及相關的電化學量測，包括開路電壓，閉路電流，交流阻抗，並且找出各系統之最佳?燒溫度。接著以不同染料，不同外加偏壓進行探討，本研究結果顯示，晶相的變化對於降解率之影響比管長、管徑大。最佳的光電催化材料為以甘油電解液製備，並以600 ℃?燒者；最佳的光電催化參數為外加偏壓1V。無論電解液為乙二醇或甘油，在600 ℃皆以銳鈦礦與金紅石相混晶存在。比較光催化與光電催化反應速率，光電催化之反應速率遠高於光催化反應。另外發現了，鈦板不須經由陽極氧化，在400 ℃時直接熱氧化，也可獲得不錯之降解率。比較兩種染料的光電催化反應，在相同時間內，亞甲基藍降解率只有甲基橙之一半。

關鍵字

二氧化鈦 ； 光電催化 ； ?燒溫度

並列摘要

Three types of TiO2 membrane were prepared in this study. Two types of TiO2 nanotube arrays membranes were prepared by two different electrolytes and calcined at different temperatures. The third type of TiO2 membrane was prepared by direct oxidation at different temperatures. The photoelectrocatalytic degradation of dyes in solution phase using the three types of TiO2 membrane calcined at different temperatures and with various bias voltages was performed. Electrochemical analysis including open circuit voltage, short circuit and electrochemical impedance spectroscopy were also performed. The results showed that photoelectrocatalytic reaction efficiency was moderated by types of crystal phase. The best photoelectrocatalytic reaction parameters are electrolyte solution of glycerol, calcination temperature of 600 ℃, and bias voltage of 1V. Either ethylene glycol or glycerol as the electrolyte, anatase and rutile mixed crystal phase exists in the form of TiO2 at 600 ℃. The study also showed that TiO2 prepared by direct thermal oxidation at 400 ℃ performed comparable reaction efficiency, photoelectrocatalytic reaction rates were faster than photocatalytic reaction rates, and photoelectrocatalytic degradation ratios of methylene blue only half of that of methyl orange.

並列關鍵字

calcination temperature ； TiO2 ； photoelectrocatalytic

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