低温合成四方相BaTiO_(3)及其压电催化性能  

Low⁃temperature synthesis of tetragonal BaTiO_(3)for piezocatalysis

作　　者：胡志文 董伟霞 包启富[1] 李萍 HU Zhiwen;DONG Weixia;BAO Qifu;LI Ping(School of Materials Science and Engineering,Jingdezhen Ceramic University,Jingdezhen,Jiangxi 333403,China;State Key Laboratory of Silicon Materials,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]景德镇陶瓷大学材料科学与工程学院,景德镇333403 [2]浙江大学硅材料国家重点实验室,杭州310027

出　　处：《无机化学学报》2024年第5期857-866,共10页Chinese Journal of Inorganic Chemistry

基　　金：江西省重大自然科学基金(No.20232ACB204017);江西省教育厅科学技术研究项目(No.GJJ2201048);景德镇市科技厅项目(No.20212GYZD009-18、20224GY008-16);2021年度开放课题“硅材料国家重点实验室”项目(No.SKL2021-04)资助。

摘　　要：基于淀粉糊化机制低温合成了四方相BaTiO_(3)粉体。采用扫描电子显微镜、透射电子显微镜、X射线衍射、傅里叶变换红外光谱、紫外可见吸收光谱、X射线光电子能谱对合成粉体的形貌、物相进行表征;在超声条件下,以系列典型染料为降解对象测试BaTiO_(3)压电催化性能。结果显示,煅烧温度为600℃时即可获得四方相BaTiO_(3)粉体,且随着温度的提升,结晶度逐渐增加;当煅烧温度为700℃时,合成的BaTiO_(3)粉体尺寸分布均匀,分散度良好,呈现类立方体状;在超声驱动下,BaTiO_(3)降解罗丹明B、刚果红、甲基橙染料时均展现出良好的效果,反应速率常数分别为1.090×10^(-2)、1.113×10^(-2)、1.084×10^(-2)min^(-1),并以降解刚果红为对象揭示其压电催化的机理,即空穴和超氧自由基是降解过程中的主要反应物质。BaTiO_(3)was synthesized at low‐temperatures based on the starch gelatinization mechanism.The morphology and phase structure of as‐synthesized samples were characterized by scanning electron microscopy(SEM),transmission electron microscope(TEM),X‐ray diffraction(XRD),Fourier transform infrared spectra(FTIR),UV visible(UV‐Vis)absorption spectra,and X‐ray photoelectron spectroscopy(XPS).The piezocatalytic performance of BaTiO_(3)was tested targeting a series of typical dyes for degradation.The results showed that tetragonal BaTiO_(3)powder was obtained at a calcination temperature of 600℃,and the crystallinity gradually increased with the increase in temperature.Cubic‐like BaTiO_(3)with uniform size distribution was synthesized at a calcination temperature of 700℃;The degradation of rhodamine B(RhB),Congo red(CR),and methyl orange(MO)dyes by BaTiO_(3)all showed good performance,with reaction rate constants of 1.090×10^(-2),1.113×10^(-2),and 1.084×10^(-2)min-1,respectively.Furthermore,the mechanism of piezocatalysis reveals that the hole(h+)and superoxide radicals(·O_(2)^(-))are the main reactive species in the degradation process by targeting the degradation of CR.

关 键 词：淀粉糊化 低温 BaTiO_(3) 压电催化 

分 类 号：TQ174.9[化学工程—陶瓷工业]