以TiO2光觸媒填充床分解水中腐植酸之研究

Degradation of Humic Acid Using Photoreactor Packed with TiO2 Immobilized on Glass Beads

陳劭聿(Shao-Yu Chen) ； 郭政憲(Cheng-Hsien Kuo) ； 錢柏勳(Bo-Shiun Chian) ； 吳世欽(Shr-Chin Wu) ； 林雅芬(Ya-Fen Lin) ； 邱求三(Chyow-San Chiou)

《國立宜蘭大學工程學刊》 3期 (2007/02) Pp. 97-107

https://doi.org/10.6176/BCE.2007.03.18

摘要

光觸媒二氧化鈦（TiO2）經照光後會產生電子電洞，可應用來分解環境中的有機污染物，實驗初步是將TiO2附著於直徑2 mm的玻璃珠上，經由UV光照射（以UV/TiO2/glass表示）後，應用於分解水溶液中的腐植酸，實驗結果發現，於溶液pH值為4-8.5時，溶液pH值的增大對UV/TiO2/glass程序分解腐植酸的效率有正面的助益，且反應溶液中的離子種類及離子強度，對腐植酸分解效率具有影響性。由Langmuir-Hinshelwood模式推導，UV/TiO2/glass光分解腐植酸的擬一階動力常數kc為0.878 mg/(min L)，而UV/TiO2/glass對腐植酸的吸附平衡常數Khumic為0.017 L/mg。由Arrhenius方程式推導，UV/TiO2/glass光分解腐植酸的活化能Ea=21.31 kJ。

關鍵字

光觸媒 ； 填充床 ； 腐植酸

並列摘要

This study evaluated the performance of a photoreactor packed with TiO2/glass, TiO2 immobilized on glass beads, initiated by UV irradiation, denoted as UV/TiO2/glass, to decompose humic acid in an aqueous solution. The photodegradation rate of humic acid by this UV/ TiO2/glass process was found to obey pseudo first-order kinetics represented by the Langmuir-Hinshelwood model. The experiomental results of this stud also show that the reaction rate was increased with increasing pH value of aqueous solution during the range from 4 to 8.5. The effect of ionic types and strength on the photodegradation rate of humic acid reveals no influence. According to Langmuit-Hinshelwood model and Arrhenius equation, Kc, Khumic and Ea are 0.878 mg/(min L), 0.017 L/mg, and 21.31 kJ, respectively.

並列關鍵字

Photodegradation ； packed-bed reactor ； UV/TiO2/glass ； humic acid