模拟太阳光下锐钛矿TiO2对化学毒剂的降解性能  

Degradation of Chemical Warfare Agent by Anatase Titanium Dioxide under the Simulated Sunlight

作　　者：沈忠[1,2] 钟近艺[1] 张哲 雷美玲[1] 郑禾[1] 辛毅[1] 

机构地区：[1]防化研究院,北京102205 [2]西北核技术研究所,陕西西安710024

出　　处：《环境科学与技术》2016年第3期68-73,共6页Environmental Science & Technology

基　　金：国家自然科学基金资助项目(21207160)

摘　　要：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TiO2进行了对比。最后测试了所制TiO2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TiO2为介孔结构,比表面积为336.8 m^2/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TiO2,动力学方程理论值与实验值的拟合方差R^2≥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%。Urea thermal decomposition and homogeneous precipitation method were used to prepare anatase titanium dioxide nanoparticles. The synthesized sample was characterized by XRD, BET, BJH, SEM and TEM. The photocatalytic decontamination of 2-CEES and DMMP on the sample was examined and compared with other two commercial TiO2 under the simulated sunlight,the data were fitted by kinetic equation. Finally,study of HD,GD,VX on the prepared TiO2 were carried out to test the alkyd paint specimen surface removal rates and 24 h photocatalytic degradation rates. Results revealed that catalytic activity of prepared TiO2 to 2-CEES and DMMP were better than the other two TiO2. The sample had mesoporous structure,whose pore width was mainly between 2 -5 nm and specific surface area was 336.8 m^2/g. The experimental values fitted well with the theoretical values of kinetic equation（R^2≥0.987 9）. After adsorbing for 90 s,the surface removal rates of HD,GD,VX were all greater than 99.99%,and after reacting for 24 h,the degradation rates of HD,GD and VX were 92.42%,99.99% and 99.59% respectively.

关 键 词：化学毒剂 二氧化钛 均匀沉淀法 模拟太阳光 降解率 表面移除率 

分 类 号：X592[环境科学与工程—环境工程] O614.4[理学—无机化学]