Kimura Toshiaki, Yoshikawa Nobuhiko, Matsumura Nobuhiko, Kawase Yoshinori
Department of Applied Chemistry, Research Center for Biochemical and Environmental Engineering, Toyo University Kawagoe, Saitama, Japan.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2004;39(11-12):2867-81.
The photocatalytic degradation of a nonionic surfactant, Sanonic SS-90 (polyoxyethylene alkyl ether) which is one of polyoxyethylene nonionic surfactants, in water has been investigated using immobilized titanium dioxide (TiO2) photocatalyst. An external UV irradiation type airlift reactor was used as a photoreactor. The effects of initial nonionic surfactant concentration, intensity of UV light, and concentrations of TiO2 photocatalyst on degradation rate of Sanonic SS-90 were examined. The photocatalytic decomposition of Sanonic SS-90 was assumed to be approximately described by the Langmuir-Hinshelwood kinetics. The rate constant of photocatalytic degradation was found to be proportional to TiO2 surface area and the square root of UV light intensity and independent on the initial concentration of Sanonic SS-90. The evaluated average UV light intensity in the airlift photoreactor was used to determine the rate constants in the Langmuir-Hinshelwood kinetics. It was found that the kinetic model for the degradation by immobilized TiO2 photocatalyst can simulate the experimental results reasonably.
使用固定化二氧化钛（TiO₂）光催化剂，对水中一种聚氧乙烯非离子表面活性剂——Sanonic SS - 90（聚氧乙烯烷基醚）的光催化降解进行了研究。采用外部紫外线照射型气升式反应器作为光反应器。考察了初始非离子表面活性剂浓度、紫外线强度以及TiO₂光催化剂浓度对Sanonic SS - 90降解速率的影响。假设Sanonic SS - 90的光催化分解大致符合朗缪尔 - 欣谢尔伍德动力学。发现光催化降解速率常数与TiO₂表面积和紫外线强度的平方根成正比，且与Sanonic SS - 90的初始浓度无关。气升式光反应器中评估的平均紫外线强度用于确定朗缪尔 - 欣谢尔伍德动力学中的速率常数。结果表明，固定化TiO₂光催化剂降解的动力学模型能够合理地模拟实验结果。
