【摘要】 采用四氯化钛控制水解合成了不同形貌的金红石型二氧化钛,考察了聚乙二醇-1000(PEG-1000)对产物形貌的影响,并用XRD,TEM和UV-Vis等手段对样品进行了表征.不同条件下的实验结果表明,不加PEG-1000时梭形二氧化钛随体系中酸度的增加和四氯化钛初始浓度的降低而团聚的倾向减缓,加入PEG-1000后,所得二氧化钛纳米粒子的粒径随PEG含量的增加而变小.对酞酸酯类(PEs)环境污染物的降解实验结果表明,通过此法合成的纳米级二氧化钛具有较高的催化活性.降解程度及降解产物用GC-MS进行检测.最后推导出PEs可能的降解过程.更多还原

【Abstract】 Rutile titania with different shapes（shuttle-like, sphere with needles, uniform particles） was prepared by manipulative hydrolysis of TiCl₄ in aqueous solution with a high acidity in the absence or presence of PEG-1000. The products were characterized by means of XRD, TEM and UV-Vis. As a result, shuttle-like nanocrystalline appeared and the aggregation was improved with the increase of the amount of acid and the decrease of the concentration of TiCl₄ in the absence of PEG-1000. Uniform nanoparticles were obtained in the presence of PEG-1000, and the diameter of the particles decreased with increasing the amount of PEG-1000. The photocatalyzed degradation of phthalate esters in aqueous suspensions of titanium dioxide shows that the synthesized titania has a high photocatalytic activity. The degradation products were analyzed by GC-MS technique and probable pathways for the degradation of PEs were proposed.更多还原