摘要
通过受控的水解-水热两步法得到了TiO2颗粒。根据X射线衍射仪、扫描电子显微镜、透射电子显微镜、N2吸附-脱附等表征结果可知,所得样品为锐钛矿型多孔纳米TiO2微球,有介孔结构,经高温(700℃)煅烧后未观察到晶相转变,晶型结构稳定。以活性艳红染料X3B为目标底物,使用制得的样品在氙灯光源照射下进行光催化脱色降解研究,染料最快在20 min即达到完全脱色,光照前10 min染料脱色率即达到52%。远远高于同样条件下商品P25的光催化活性(光照前10 min脱色率23.8%)。未煅烧的样品显示出最佳的光催化活性,随着煅烧温度的提高,样品光催化活性下降,证实了光催化剂表面对染料及其他活性物种的吸附作用是决定反应速率的关键因素。
TiO2 nanoparticles were prepared from a controlled hydrolysis-hydrothermal two-step method.According to X-ray diffraction,scanning electron microscopy,transmission electron microscopy,N2 adsorption-desorption and other characterizations,it can be confirmed that the samples were composed of TiO2 microspheres in anatase phase with the mesoporous structure.The phase transformation didn′t occur even after high temperature(700℃)calcination,proving that the crystal structure was relatively stable.Taking the reactive brilliant red dye X3 B as substrate,the photocatalytic activity of the received TiO2 was evaluated by the photodecolorization of X3 B aqueous solution under the xenon lamp irradiation.The sample with the highest activity could rapidly reach the total decolorization of the dye in 20 min,with more than half dye degraded in the first 10 min,which was much better than that of commercial P25 TiO2.With the increase of the calcination temperatures,the photocatalytic activity of the TiO2 decreased dramatically,which confirmed that the surface adsorption of the dye and other active species on TiO2 was the key factor that affected the degradation process.
作者
刘秋红
李凯静
吴松浩
韩冰
侯鹏
董立峰
孙琼
LIU Qiuhong;LI Kaijing;WU Songhao;HAN Bing;HOU Peng;DONG Lifeng;SUN Qiong(Colege of Materials Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China;State Key Laboratory of Photocatalysis on Energy and Environment,Fuzhou University,Fuzhou 350116,China)
出处
《青岛科技大学学报（自然科学版）》
CAS
2021年第1期72-77,共6页
Journal of Qingdao University of Science and Technology:Natural Science Edition
基金
国家自然科学基金青年基金项目(51402161)
福州大学能源与环境光催化国家重点实验室开放课题资助项目(SKLPEE-KF201707)。
关键词
光催化
锐钛矿
二氧化钛
水解-水热法
photocatalysis
anatase
titanium dioxide
hydrolysis-hydrothermal method
