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微乳溶剂热法制备暴露{001}晶面的纳米TiO2
刘会娥,于磊,田关锋,马玉笛,陈爽
(中国石油大学(华东)重质油国家重点实验室, 山东青岛 266580)
摘要:
以NH4F为形貌控制剂,通过微乳溶剂热法制备暴露{001}晶面的纳米TiO2。以环己烷为油相,以十八烷基三甲基氯化铵(OTAC)为表面活性剂,正丁醇为助表面活性剂配制微乳液,微乳液中水与表面活性剂的物质的量比为20∶1。通过改变n(F/Ti)(F与Ti的物质的量比)以及溶剂热反应的时间,探究制备高活性{001}晶面TiO2的最佳条件。采用X射线衍射仪(XRD)、透射电子显微镜(TEM)、X射线电子能谱仪(XPS)对制取的纳米TiO2光催化剂进行表征。通过在紫外光下降解40 mg/L的甲基橙溶液,考察制备的TiO2光催化剂的催化活性。结果表明:F/Ti配比为0.25、溶剂热反应42 h条件下所制取TiO2的光催化活性最高;紫外光照降解反应1 h后,其对甲基橙的降解率可以达到93.6%;与焙烧获取的锐钛矿TiO2相比,光催化活性明显提高。
关键词:  微乳液  TiO2  光催化剂  溶剂热  {001}晶面
DOI:10.3969/j.issn.1673-5005.2020.03.020
分类号::TB 34
文献标识码:A
基金项目:山东省自然科学基金项目(ZR2017MB015);中国石油科技创新基金项目(2017D-5007-0601);重质油国家重点实验室项目(SLKZZ-2017002)
Preparation of nano-TiO2 with {001} facets via microemulsion-solvothermal method
LIU Huie, YU Lei, TIAN Guanfeng, MA Yudi, CHEN Shuang
(State Key Laboratory of Heavy Oil Processing in China University of Petroleum(East China), Qingdao 266580, China)
Abstract:
The nano-titania photocatalyst with {001} facets exposed was prepared via microemulsion-solvothermal method using NH4F as the morphology-controlling agent. Cyclohexane, octadecyltrimethyl ammonium chloride (OTAC) and n-butanol were used as oil phase, surfactant and cosurfactant in the microemulsion system, respectively. The molar ratio of water/OTAC was 20. By changing the molar ratio of F/Ti and the solvothermal reaction time, the optimum conditions for the preparation of TiO2 with high reactivity {001} facets were determined. The prepared nano-titaniaphoto catalysts were characterized by X-ray diffraction (XRD), transmission electron mocroscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Furthermore, the photocatalytic activity of TiO2 was investigated by photodegradation of 40 mg·L-1 methylene orange solution under UV light. The results show that the TiO2 photocatalyst presents the highest photocatalytic activity when the time of solvothermal reaction is 42 hours and the molar ratio of F/Ti is 0.25. And the methyl orange degradation rate is up to 93.6% under ultraviolet irradiation for 1 h, which exhibits higher photocatalytic reactivity than anatase TiO2 obtained via microemulsion-calcination method.
Key words:  microemulsion  TiO2  photocatalyst  solvothermal  {001} facets
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