Chen Yi-Hung, Liu Yi-You, Lin Rong-Hsien, Yen Fu-Shan
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 Apr 30;163(2-3):973-81. doi: 10.1016/j.jhazmat.2008.07.097. Epub 2008 Jul 30.
This study investigates the photocatalytic degradation of p-phenylenediamine (PPD) with titanium dioxide-coated magnetic poly(methyl methacrylate) (TiO2/mPMMA) microspheres. The TiO2/mPMMA microspheres are employed as novel photocatalysts with the advantages of high photocatalytic activity, magnetic separability, and good durability. The scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), and transmission electron microscopy (TEM) images of the TiO2/mPMMA microspheres are used to characterize the morphology, element content, and distribution patterns of magnetite and TiO2 nanoparticles. The BET-specific surface area and saturation magnetization of the TiO2/mPMMA microspheres are observed as 2.21 m(2)/g and 4.81 emu/g, respectively. The photocatalytic degradation of PPD are performed under various experimental conditions to examine the effects of initial PPD concentration, TiO2/mPMMA microsphere dosage, and illumination condition on the eliminations of PPD and chemical oxygen demand (COD) concentrations. Good repeatability of photocatalytic performance with the use of the TiO2/mPMMA microspheres has been demonstrated in the multi-run experiments. The photocatalytic kinetics for the reductions of PPD and COD associated with the initial PPD concentration, UV radiation intensity, and TiO2/mPMMA microsphere dosage are proposed. The relationships between the reduction percentages of COD and PPD are clearly presented.
本研究考察了二氧化钛包覆的磁性聚甲基丙烯酸甲酯（TiO₂/mPMMA）微球对对苯二胺（PPD）的光催化降解作用。TiO₂/mPMMA微球被用作新型光催化剂，具有高光催化活性、磁分离性和良好的耐久性等优点。利用TiO₂/mPMMA微球的扫描电子显微镜（SEM）、能量色散谱仪（EDS）和透射电子显微镜（TEM）图像来表征磁铁矿和TiO₂纳米颗粒的形态、元素含量及分布模式。TiO₂/mPMMA微球的BET比表面积和饱和磁化强度分别为2.21 m²/g和4.81 emu/g。在各种实验条件下进行PPD的光催化降解，以考察初始PPD浓度、TiO₂/mPMMA微球用量和光照条件对PPD去除率及化学需氧量（COD）浓度的影响。多次实验证明了使用TiO₂/mPMMA微球时光催化性能具有良好的重复性。提出了与初始PPD浓度、紫外辐射强度和TiO₂/mPMMA微球用量相关的PPD和COD还原的光催化动力学。明确呈现了COD和PPD还原百分比之间的关系。
