TiO_2纳米管的制备及对O_3的催化性能  

Preparation of titanium dioxide nanotube and its catalytic activity for ozonation

作　　者：潘留明[1] 季民[1] 王苗苗[1] 张昕[1] 陆彬[1] 

机构地区：[1]天津大学环境科学与工程学院,天津300072

出　　处：《化工学报》2007年第11期2787-2792,共6页CIESC Journal

基　　金：教育部天南大合作项目~~

摘　　要：用水热法制备了高比表面积的TiO2纳米管,通过TEM、XRD及BET进行物化表征,试验得到外径5～7nm、壁厚1nm左右、长200～300nm、比表面积276m2.g-1的锐钛型TiO2纳米管。试验考察了TiO2纳米管的吸附性能及对O3的催化性能和本征反应动力学,结果显示:60min时O3/UV/TiO2纳米管较O3/UV/P25和O3/UV对垃圾渗滤液的COD去除率分别提高了20.83%和32.65%;293K时0.5gTiO2纳米管对COD的最大吸附量为P25的1.34倍,对COD去除率贡献为10.14%;2h内O3/UV/TiO2纳米管工艺的总反应表观速率常数k分别是O3/UV/P25工艺的1.19倍和O3/UV工艺的1.80倍;得出两种催化工艺k-T关系方程,反应表观活化能Ea,nanotube比Ea,P25降低了2.925kJ.mol-1。Titanium dioxide nanotubes were prepared by the hydrothemeral method, and characterized with TEM, XRD and BET. The anatase products, with an external diameter of 5-7 nm, a wall thickness of about 1 nm and a length of 200-300 nm, had a specific surface area of 276 m^2 · g ^-1. Their adsorption of COD, catalytic activity and reaction kinetics for ozonation in landfill leachate solution were studied. The removal rate of COD by using O3/UV/TiO2 nanotubes in 60 minutes was 20. 83% better than using O3/ UV/P25 （Degussa, Germany）, and 32.65% better than using O3/UV （Yingze Corp. , China）. In landfill leachate solution, the maximal absorption of COD on 0. 5 g TiO2 nanotubes, contributing 10.14% of the total COD removal rate, was 1.34 times as that on 0. 5 g P25 at 293 K. The overall apparent rate constant of O3/UV/TiO2 nanotubes was 1.19 times as that of O3/UV/P25, and 1.80 times as that of O3/UV in 2 hours. Two equations between k and T were obtained, and the total apparent activation energy of O3/UV/ TiO2 nanotubes was 2. 925 kJ · mol^- 1 less than that of O3/UV/P25.

关 键 词：纳米管 水热法 催化臭氧化 反应动力学 表观活化能 

分 类 号：TQ426[化学工程] O643[理学—物理化学]