Highly crystallized anatase bowknot-like TiO2 nanocrystals had bed prepared by a hydrothermal method in the presence of tetramethylammonium hydroxide (TMAOH).FT-IR,XRD,TEM and UV-Vis were employed to characterize the crystalline phase and morphology of as-prepared TiO2 nanoparticles.The results showed that all diffraction peaks were corresponding to anatase phase without any other impurity phase.The diffraction lines were relatively broad,indicating the nanosize of highly crystallinity.TMAOH played a structural template role to modify the TiO2 particle shape to nanorod.Many nanorods sticked together in the middle and displayed uniform bowknot-like bundles with two ends fanning out.The formed nanorod had a width of 5 ～ 20nm and length of 270 ～430nm.The presence of TMAOH provided organic cation to assist and direct the polycondensation process,resulting in the formation of bowknot-like anatase.All the anatase dispersions showed the absorption behavior for the ultraviolet lights.After 6 h by photolysis reaction,the bowknot-like TiO2 nanocrystals showed relatively higher photocatalytic degradation of phenol by 62.3％.The highly photocatalytic activity maybe attributed to the higher surface-to-volume ratio,which would guarantee a high density of active sites available for surface reactions as well as a high interfacial charge carrier transfer rate.The increased delocalization of carriers in rods would reduce the e-/h + recombination to ensure a more efficient charge separation.%以四甲基氢氧化铵为结构导向剂,钛酸四丁酯为钛源,水热法制备纳米TiO2光催化材料,由FT-IR、XRD、TEM、UV-Vis等测试手段对其结构和形貌进行表征.通过苯酚的光催化降解实验测试其光催化性能.结果表明,所得TiO2为锐钛矿相、蝴蝶结状,结晶度高、规整度高,经紫外光照6h后,对苯酚的光降解率可达62.3％,具有较高的光催化活性.
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