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標題: 以TiO2/Ti光電極降解水溶液中草酸鈉之研究
Study on the photoelectrocatalytic treatment of sodium oxalate by using TiO2/Ti thin-film electrode
作者: 陳昱穎
Chen, Yu-Ying
關鍵字: photoelectrocatalytic;光電催化;TiO2;sodium oxalate;二氧化鈦;草酸鈉
出版社: 環境工程學系所
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本研究主要是將二氧化鈦以化學氣相沉積法( Chemical vapor deposition,CVD )固著於基材鈦板上,且外加電壓於工作電極(陽極),搭配365nm紫外燈管照射進行水溶液中草酸鈉的光電催化反應。
結果顯示,草酸鈉在水溶液為中性到酸性的這段區間(pH 7-3),以pH 3有最佳的去除效果;添加不同電解液對草酸鈉的去除效率有不同幅度的提升,而本研究中又以添加硫酸鈉所能提升的光電催化效益為最多。此外,進行光催化反應時,施予外加電壓可以抑制電子電洞對的再結合,提升整體的去除效率,但是給予超過0.25 V的電壓,反而會因為電壓本身的電子與TiO2價帶上電洞進行再結合而降低了光電催化的效益。
在外加電壓1 V的狀況下,不同草酸鈉初始濃度對整體的去除效益並未有很大的差別。但於外加電壓0.25 V及0.5 V時,草酸鈉的降解反應會隨著初始濃度的提升而下降。

In this study, the TiO2 thin film was deposited on the titanium plate by chemical vapor deposition (CVD) method. The photoelectrocatalytic degradation ability of TiO2 in sodium oxalate(Na2C2O4) solution at 365 nm UV lamp with additional potential was investigated.
The experimental equipment was a batch system. The effects of pH, different supporting electrolytes, applied potential, and Na2C2O4 concentration were examined and discussed.
In the results, the Na2C2O4 solution has better photoelectrocatalytic degradation at pH 3. Added different electrolytes has different effect, and in this study Na2SO4 addition improved the most photoelectrocatalytic effect.Added applied potential in photocatalytic reaction can prohibit recombination of electron/hole pairs, but added applied potential was over than 0.25 V, the photoelectrocatalytic effect was decrease.
When added applied potential was 1V, different Na2C2O4 concentration did not has effect, but when the potential was 0.25 V and 0.5V, Na2C2O4 degradation drcrease as the initial concentration increased.
其他識別: U0005-2706200714515700
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