CeO_2纳米管的水热合成、表征及性能研究  

Hydrothermal Synthesis,Characterization and Property of CeO_2 Nanotube

作　　者：赵晓兵[1] 游静[1] 陆晓旺[1] 陈志刚[2] 

机构地区：[1]常州大学材料科学与工程学院,常州213164 [2]苏州科技学院化学与生物工程学院,苏州215011

出　　处：《无机材料学报》2011年第2期159-164,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(20771047);江苏省自然科学基金(BK2008541)~~

摘　　要：以P123为表面活性剂,采用水热法合成CeO2纳米管.研究反应时间、反应温度、表面活性剂浓度对CeO2纳米管形成的影响规律.采用TEM、XRD、N2吸脱附仪对样品的微观结构进行表征.并考察CeO2纳米管对亚甲基蓝溶液的催化性能.结果表明,当反应时间为72 h、反应温度为160℃、n（P123）：n（CeCl3.7H2O）=1：5时,可制备出单晶结构的CeO2纳米管.所制备的CeO2纳米管外径为40~60nm,内径为20 nm左右,长度为500~1000nm.CeO2纳米管是由Ce（OH）3晶种的溶解再结晶-异向生长-自我卷曲形成的.相对于CeO2纳米颗粒和CeO2纳米棒,CeO2纳米管对亚甲基蓝染料的脱色率有明显提高.这与CeO2纳米管孔道的吸附作用,暴露的高反应活性面（110）和表面有大量缺陷有关.CeO2 nanotubes were synthesized by hydrothermal method using PEO-PPO-PEO（P123） as surfactant.The effects of reaction time,reaction temperature and concentration of surfactant on the formation of CeO2 nano-tubes were investigated.The microstructures of the samples were characterized by transmission electron microscope,X-ray diffraction and N2 adsorption-desorption methods.The catalytic properties of CeO2 samples on methylene blue were also examined.The results indicate that single crystal CeO2 nanotubes are obtained when reaction time is 72 h,reaction temperature is 160℃ and molar ratio of P123 to CeCl3.7H2O is 1：5.The external diameter of CeO2 nanotubes is 40-60 nm,their internal diameter is about 20 nm and their length is 500-1000 nm.The formation mechanism of CeO2 nanotubes is subjected to dissolution-recrystallization,anisotropic growth and self crimping of Ce（OH）3 crystal seed.Compared with CeO2 nanoparticles and nanorods,CeO2 nanotubes demonstrate better cata-lytic activity on methylene blue,which is attributed to the remarkable adsorption of pore,exposure of higher active surface（110） and considerable defects on the surface of CeO2 nanotubes.

关 键 词：水热法 CeO2纳米管 催化 

分 类 号：O611[理学—无机化学] O614[理学—化学]