超声法制备TiO_2纳米棒及其光催化性质的研究

Ultrosonic synthesis of rod-like nanocrystalline titania and its photocatalytic property

研究了TiO2纳米棒的制备和形成机理及其在光催化降解活性艳红中的应用。采用超声法,以TiCl4为原料,制备了纳米TiO2。SEM结果显示所制备的TiO2为棒状结构,直径30 nm左右,长约200 nm。比表面积为60.500 7 m2/g。XRD显示其为金红石型晶体,700℃烧结后结晶程度增强,形貌保持不变,比表面积降到37.963 2 m2/g。超声法制备的TiO2纳米棒700℃烧结后应用于光催化降解活性艳红时,降解率高达98.94%,表现出优于P25的催化活性。

Rod-like nanocrystalline TiO2 powders had been prepared through an easy ultrasonic method using TiCl4 as starting material. The powders were characterized by XRD, SEM, and BET techniques, SEM results indicate that the obtained powders are rod-like structures with diameters of about 30 nm and lengths about 200 nm. XRD results show that they are pure rutile, the crystallization increase with the sintering temperature without any change of the morphology. The BET single point surface area of the rod-like TiO2 is 60.500 7 m^2/g and decrease to 37.963 2 m^2/g after sintering. The formation mechanism of nanocrystalline TiO2 under a high intensity ultrasonic irradiation was also investigated. When the as-prepared rod-like nanocrystalline titania after sintering at 700℃ is used in photocatalytic degradation of X-3B, the effect is better than Degussa P25.