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采用尿素热分解均匀沉淀法制备了锐钛矿型纳米二氧化钛光催化剂,通过XRD、BET、BJH、TEM、SEM等技术对样品进行了表征。在模拟太阳光下用化学毒剂模拟剂2-CEES和DMMP开展了光催化消毒实验,并对实验数据进行了动力学方程拟合,与市售的2种TiO_2进行了对比。最后测试了所制TiO_2对HD、GD和VX 3种毒剂的醇酸漆试片表面移除率及24 h光催化降解率。结果表明:制备出的TiO_2为介孔结构,比表面积为336.8 m2/g,孔径分布主要在2~5 nm之间;模拟太阳光下对2-CEES和DMMP的降解性能均优于另外2种TiO_2,动力学方程理论值与实验值的拟合方差R2≥0.987 9;吸附90 s后,对醇酸漆试片表面HD、GD和VX的移除率均大于99.99%;反应24 h后,对HD、GD和VX的降解率分别为92.42%、99.99%和99.59%。
Anatase nano-sized titanium dioxide photocatalyst was prepared by homogeneous decomposition of urea by thermal decomposition. The samples were characterized by XRD, BET, BJH, TEM and SEM. Photocatalytic disinfection experiments were carried out with simulated chemical agents 2-CEES and DMMP under simulated sunlight conditions. The kinetic equations of the experimental data were fitted and compared with the commercially available two kinds of TiO 2. Finally, the surface removal rate and the photocatalytic degradation rate of 24 h photocatalyst of TiO 2 prepared by HD, GD and VX were tested. The results show that the prepared TiO 2 has a mesoporous structure with a specific surface area of 336.8 m 2 / g and a pore size distribution of 2 to 5 nm. The degradation performance of 2-CEES and DMMP under simulated sunlight is better than that of the other two TiO_2. The fitting variance of theoretical and experimental values of kinetic equation R2≥0.987 9. After 90 s adsorption, the removal rates of HD, GD and VX on the surface of alkyd paint samples were all more than 99.99% The degradation rates of HD, GD and VX were 92.42%, 99.99% and 99.59% respectively.