摘要
以钛酸丁酯为前驱物,HF为形貌控制剂,采用水热法合成{001}面TiO_(2)光催化材料.通过X射线衍射、紫外\可见光吸收光谱、扫描电镜及透射电镜等手段对样品形貌及结构进行表征,并在紫外光下考察其对NO_(x)的光催化氧化活性.结果表明,{001}面TiO_(2)具有良好的锐钛矿晶型,为{001}面暴露率约50%的纳米级片状结构,在紫外波段具有强烈的光吸收.经过碱液洗涤去除表面F离子后的{001}面TiO_(2)与{101}面TiO_(2)及P25相比,其对NOx去除效果显著.在催化反应达到平衡后,其NO转化率为{101}面TiO_(2)的2倍及P25的3倍.并且NO去除量增加的同时NO_(2)的相对生成量却减少,导致光催化反应进行得更彻底.
Anatase TiO_(2) with exposed{001}facets were synthesized by a hydrothermal route using tetrabutyl titanate as the precursor and HF solution as the solvent.The prepared catalysts were characterized by X-ray diffraction,UV-vis diffuse reflectance spectroscopy,scanning electron microscopy and transmission electron microscopy techniques.The photocatalytic activity of samples for NOx oxidation was investigated under UV light irradiation.The results showed that the TiO_(2) nanosheets with about 50%{001}facets had good anatase crystal and strong light absorption in the ultraviolet range.Compared to{101}TiO_(2) and P25,{001}TiO_(2) washed with NaOH to remove surface F ions had higher photocatalytic activity for NO_(x) oxidation under UV light irradiation.After the reaction reached equilibrium,the NO conversion was twice of that on{101}TiO_(2) and 3 times of that on P25.Furthermore,with the increase of NO removal the NO_(2) yield decreased on the alkali washed{001}TiO_(2) sample,promoting the photocatalytic reaction more thoroughly.
作者
林春敬
胡芸
韦朝海
LIN Chunjing;HU Yun;WEI Chaohai(The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters,Ministry of Education,College of Environment and Energy,South China University of Technology,Guangzhou,510006,China)
出处
《环境化学》
CAS
CSCD
北大核心
2013年第8期1507-1512,共6页
Environmental Chemistry
基金
国家自然科学基金项目(21277051,20807015)
广州市科技计划(12C62081602)
华南理工大学中央高校基本科研业务费专项资金(2012ZZ0049)资助
