【摘要】 采用TiCl₄水解法制备了被聚乙二醇（PEG）包覆的TiO₂粉体,并通过X射线衍射（XRD）、透射电镜（TEM）对粉体的物相组成及表面形貌进行表征。将合成的TiO₂粉体用于2,4-二氯苯氧乙酸（2,4-DPA）的降解反应中,利用荧光光度计以及紫外可见分光光度计等技术手段,考察溶液的荧光及紫外吸收强度随光照时间的变化关系,并以此判断包覆的TiO₂的光催化性能。结果表明:PEG包覆的TiO₂能降低2,4-DPA溶液的荧光强度和紫外吸收强度,有明显的光催化降解作用,且以相对分子质量较大的PEG包覆的效果较好。更多还原

【Abstract】 TiO₂ powder coated by polyethylene glycol（PEC）,a photocatalyst,was prepared by hydrolyzing method of TiCl₄ and its composition and appearance were characterized by XRD and TEM.The PEG-coated TiO₂ powder as photodegradation catalyst was used in degradation of 2,4-dichlorophenoxyacetic acid（2,4-DPA）. The changes of fluorescence and UV absorption intensities of the 2,4-DPA solution with UV exposure time were investigated using fluorescenc spectrometer and UV-vis spectrophotometer to determine the photocatalytic activity of the coated TiO₂.The experimental results showed that the PEG-coated TiO₂ powder could obviously reduce the intensities of fluorescence and UV absorption of 2,4-DPA and had good photocatalytic degradation.The larger the molecular weight of PEG was,the better the photocatalytic degradation of the PEG-coated TiO₂ powder were.更多还原