油酸辅助水热合成纳米钛酸锶的性能调控与表征  

Regulation of properties and characterization of strontium titanate nanoparticles synthesis by oleic acid-assisted hydrothermal process

作　　者：张娜 钟莉[1] 段东平[1,2] Na ZHANG;Li ZHONG;Dongping DUAN(Key Laboratory of Green Process and Engineering,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;School of Chemical Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院绿色过程与工程重点实验室,北京100190 [2]中国科学院大学化学工程学院,北京100049

出　　处：《过程工程学报》2019年第6期1212-1219,共8页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号：51402301);青海省科技支撑计划资助项目(编号：2015-GX-108A)

摘　　要：采用油酸辅助一步水热法,以廉价易得的锐钛矿型TiO2为钛源、Sr(OH)2×8H2O为锶源合成SrTiO3纳米颗粒,通过XRD,TEM和SEM研究了SrTiO3纳米颗粒的形貌,考察了反应时间、Sr/Ti摩尔比和油酸浓度对SrTiO3纳米颗粒性能的影响,以所制SrTiO3为催化剂降解亚甲基蓝考察其光催化性能。结果表明,钙钛矿型立方相SrTiO3纳米颗粒具有均匀的尺寸和规则的形貌。实验范围内,随反应时间和Sr/Ti摩尔比增加,SrTiO3纳米粒子的晶粒尺寸呈增加趋势;随油酸浓度增加,SrTiO3颗粒粒度呈下降趋势。添加油酸可调控制备出具有规则形貌的钙钛矿型立方相结构的SrTiO3纳米颗粒;Sr/Ti摩尔比为0.75时,产品纯度高、结晶度好。油酸、反应时间和Sr/Ti摩尔比对SrTiO3纳米粒子微观结构的影响可分别用颗粒间作用力、奥斯特瓦尔德熟化和晶体成核理论解释。Due to its excellent photocatalytic activity and piezoelectricity properties, SrTiO3 has attracted much attention in environmental photocatalysis, electronic and ceramic industries. SrTiO3 nanoparticles were synthesized by one-step oleic acid-assisted hydrothermal process using anatase Ti O2 and Sr(OH)2×8 H2O in this work. SrTiO3 nanoparticles were analyzed. The effects of oleic acid concentration, reaction time and Sr/Ti molar ratio on the properties of SrTiO3 nanoparticles were researched, photocatalytic property of the prepared SrTiO3 catalyst was investigated by the degradation of methylene blue. The results showed that perovskite phase cubic SrTiO3 nanoparticles with uniform size and regular morphology. The grain size of SrTiO3 nanoparticles increased with the increase of reaction time and Sr/Ti molar ratio, while decreased with the increase of oleic acid concentration. The agglomerate phenomenon of SrTiO3 nanoparticles became weaken and perovskite phase cubic SrTiO3 nanoparticles with regular morphology were obtained with the addition of oleic acid. When the Sr/Ti molar ratio was 0.75, the purity of the product was high. The influence of oleic acid concentration, reaction time and Sr/Ti molar ratio on microstructures of SrTiO3 nanoparticles could be explained by interparticle force, Ostwald ripening and crystal nucleation theory, respectively.

关 键 词：SrTiO3纳米粒子 锐钛矿型TiO2 性能调控 油酸辅助水热合成 晶体成核理论 

分 类 号：TG146.2[一般工业技术—材料科学与工程]