• 作者： Sun, Chih-Cheng; Chou, Tse-Chuan
• 中文摘要： 本研究藉由懸浮狀之TiO/sub 2/光觸媒，探討異相光催化氧化亞硝酸離子成低毒性之硝酸離子。實驗結果發現通入空氣於反應液中將促進光催化反應。在光催化氧化亞硝酸離子中，反應物吸附在光觸媒之步驟是重要的。在鹼性條件下，對稀釋亞硝酸離子溶液之光催化氧化反應，推導得一半理論之動力學速率方程式，R/sub i/=2.36*10/sup -4/[TiO/sub 2/]/sup 0.12/[NO/sub 2//sup-/][OH/sup -/]/sup -0.30/。而在酸性條件下，無法正確地量測或確認光催化氧化亞硝酸離子成硝酸離子。在濃度1~3%之稀薄NaCl水溶液中，Cl/sup -/離子僅些微的影響光催化反應，並且，Cl/sup -/離子無法促進光催化氧化亞硝酸離子。此外，在濃度0.51M之Cl/sup -/離子溶液中，亞硝酸離子之光催化氧化去除率僅為不含Cl/sup -/離子之溶液的85%。
• 英文摘要： The heterogeneous photocatalytic oxidation of nitrite ion using suspension TiO/sub 2/ photocatalyst is investigated. Experimental results indicate that bubbling air through the solution promotes the photocatalytic reaction. The adsorption of reactant on photocatalyst is significant in photocatalytic oxidation of nitrite ion as well. Under an alkaline condition, a semitheoretical kinetic rate equation, R/sub i/=2.36*10/sup -4/[TiO/sub 2/]/sup 0.12/[NO/sub 2//sup-/][OH/sup -/]/sup -0.30/, is obtained in dilute NO/sub 2//sup -/ solution. Under an acidic condition, the photocatalytic oxidation rate of NO/sub 2//sup -/ can not be measured or be determined exactly. In a 1-3% dilute NaCl solution, Cl/sup -/ ion only slightly affects the photocatalytic reaction. Moreover, the Cl/sup - / ion cannot promote the photocatalytic oxidation of nitrite ion. Furthermore, the photooxidation removal percentage of nitrite ion in the presence of 0.51M of Cl/sup -/ solution is only 85% of the system without Cl/sup -/ ion.
• 中文關鍵字： 亞硝酸離子; 光催化; 光氧化; 二氧化鈦
• 英文關鍵字： Nitrite Ion; Photocatalysis; Photooxidation; Titanium Dioxide