溶胶凝胶法合成La_(0.5)Sr_(0.5)Co_(0.8)Mn_(0.2)O_(3-δ)钙钛矿及其催化性质  

Sol-gel Synthesis and Catalytic Property of La_(0.5)Sr_(0.5)Co_(0.8)Mn_(0.2)O_(3-δ)Perovskite

作　　者：毛韦达 赵林[1] MAO Weida;ZHAO Lin(College of Environmental Sciences and Engineering,Tianjin University,Tianjin 300072,China;Beijing Orient Landscape Environment Co.,Ltd,Beijing 100015,China)

机构地区：[1]天津大学环境科学与工程学院,天津300072 [2]北京东方园林环境股份有限公司,北京100015

出　　处：《材料导报》2021年第24期24001-24005,共5页Materials Reports

基　　金：国家自然科学基金(41728001,41572237);天津市科技计划项目(18ZXSZSF00240)。

摘　　要：采用溶胶凝胶煅烧法合成了La_(0.5)Sr_(0.5)Co_(0.8)Mn_(0.2)O_(3-δ)纳米粉,通过X射线衍射、电子显微镜、X射线光电子能谱和碘定量滴定等测试方法对合成物进行了表征,并以四溴双酚A为模型污染物,考察其催化性能。结果表明,合成的纳米La_(0.5)Sr_(0.5)Co_(0.8)Mn_(0.2)O_(3-δ)具有钙钛矿R-3 c结构,平均晶粒尺寸为40~70 nm。与通氮气煅烧的样品相比,弱氧化煅烧样品的非化学计量氧浓度适中,钙钛矿结构中B位离子平均价态相对较稳定,其催化性能较强且相对较稳定,可再生循环使用四次。The La_(0.5)Sr_(0.5)Co_(0.8)Mn_(0.2)O_(3-δ)nanoparticles were prepared by sol-gel calcinations synthesis.The samples were characterized by means of XRD,electron microscopy,X-ray photoelectron spectroscopy and iodometric titration.Tetrabromobisphenol A was used as model pollutant to investigate its catalytic performance.The results showed that the La_(0.5)Sr_(0.5)Co_(0.8)Mn_(0.2)O_(3-δ)particles had R-3 c perovskite structure with an average grain size of 40-70 nm.Compared with the samples calcined under nitrogen,the non-stoichiometric oxygen concentration of the samples calcined by weak oxidation were moderate,the average valence of overall B-site ions in perovskite structure was also relatively stable,and its catalytic performance was therefore strong and relatively stable,which can be recycled for 4 times.

关 键 词：纳米La_(0.5)Sr_(0.5)Co_(0.8)Mn_(0.2)O_(3-δ) 溶胶凝胶煅烧 非化学计量氧 催化性能 

分 类 号：O614.33[理学—无机化学]