Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, 1, Sec. 3, Chung-Hsiao E. Road, Taipei 106, Taiwan.
J Hazard Mater. 2009 Dec 15;172(1):20-9. doi: 10.1016/j.jhazmat.2009.06.122. Epub 2009 Jun 30.
This study investigates the photocatalytic degradation of dimethyl phthalate (DMP) with both the titanium dioxide-coated magnetic poly(methyl methacrylate) (TiO2/mPMMA) and platinum-doped TiO2/mPMMA (Pt-TiO2/mPMMA) microspheres. The TiO2/mPMMA and Pt-TiO2/mPMMA microspheres are employed as novel photocatalysts that offer high photocatalytic activity, magnetic separability and good durability. The photocatalytic experiments of DMP under various conditions are conducted to examine the effects of the initial DMP concentration, photocatalyst dosage, UV radiation intensity and Pt doping content on the degradation of DMP. In addition, the correlations of the photocatalytic kinetics and quantum yield for DMP removal are proposed associated with the system parameters. According to the experimental results, there exists a distinct relationship between the reduction percentages of total organic carbons and DMP. Furthermore, the photodegradation mechanism of DMP in the photocatalytic process is established based on the identification of the intermediates. Moreover, the good repeatability of the photocatalytic performance with the use of the Pt-TiO2/mPMMA microspheres has also been demonstrated in the multi-run experiments. Therefore the Pt-TiO2/mPMMA microspheres are considered as a practical and promising photocatalyst in a suspension reaction system and they can be effectively recovered after use. This study provides useful information about the applications of the TiO2/mPMMA and Pt-TiO2/mPMMA microspheres for the photodegradation of DMP.
本研究考察了二氧化钛包覆磁性聚甲基丙烯酸甲酯（TiO2/mPMMA）和掺铂二氧化钛/磁性聚甲基丙烯酸甲酯（Pt-TiO2/mPMMA）微球对邻苯二甲酸二甲酯（DMP）的光催化降解。TiO2/mPMMA 和 Pt-TiO2/mPMMA 微球作为新型光催化剂，具有高的光催化活性、磁性分离性和良好的耐久性。在各种条件下进行 DMP 的光催化实验，考察初始 DMP 浓度、光催化剂用量、UV 辐射强度和 Pt 掺杂含量对 DMP 降解的影响。此外，还提出了与系统参数相关的 DMP 去除的光催化动力学和量子产率的相关性。根据实验结果，总有机碳的还原百分比与 DMP 之间存在明显的关系。此外，根据中间产物的鉴定，建立了 DMP 在光催化过程中的光降解机制。此外，在多轮实验中还证明了使用 Pt-TiO2/mPMMA 微球时光催化性能的良好重复性。因此，Pt-TiO2/mPMMA 微球被认为是悬浮反应体系中一种实用且有前途的光催化剂，使用后可以有效回收。本研究为 TiO2/mPMMA 和 Pt-TiO2/mPMMA 微球在 DMP 光降解中的应用提供了有用的信息。
