College of Atmospheric Sciences, Lanzhou University, Lanzhou, China.
Environ Technol. 2009 Oct;30(11):1103-9. doi: 10.1080/09593330902988711.
Kinetic studies on the photocatalytic degradation of aliphatic carboxylic acids were carried out in a slurry photoreactor with in-situ monitoring, employing artificial UV light as the source of energy and nano-TiO2 powder as the catalyst. The influences on the photocatalytic degradation such as the initial concentration of reactant (C0), catalyst dosage (CTiO2), UV intensity (Ia) and pH value have been investigated. Good agreement has been obtained between the value calculated by Langmuir-Freundlich-Hinshelwood (L-F-H) model and experimental data, with coefficient of multiple determination (R2) varying from 0.880 to 0.999. The L-F-H model has been proven to be feasible in describing the kinetic characteristic of the photocatalytic degradation of aliphatic carboxylic acids. Moreover, the apparent reaction rate constant (k) of the photocatalytic degradation of dicarboxylic acids is higher than that of monocarboxylic acids with the same carbon atoms. This shows that the photocatalytic degradation rate is favoured by different chemical structure.
采用内照式光反应器，以人工紫外光为光源，纳米 TiO2 粉末为催化剂，对脂肪族羧酸的光催化降解进行了动力学研究，考察了反应物初始浓度（C0）、催化剂用量（CTiO2）、紫外光强度（Ia）和 pH 值等因素对光催化降解的影响。Langmuir-Freundlich-Hinshelwood（L-F-H）模型计算值与实验数据吻合较好，相关系数（R2）在 0.880 到 0.999 之间。证明 L-F-H 模型能够很好地描述脂肪族羧酸光催化降解的动力学特征。此外，具有相同碳原子数的二羧酸的光催化降解表观反应速率常数（k）高于一元羧酸，这表明光催化降解速率受不同化学结构的影响。
