核壳结构TiO_(2)微球的制备及其光催化性能  

Preparation and Photocatalytic Properties of Core-Shell TiO_(2)Microspheres

作　　者：杜晶晶[1] 赵军伟[1] 施飞[1] 赵忠[1] 卢钱杰 程晓民[1] DU Jingjing;ZHAO Junwei;SHI Fei;ZHAO Zhong;LU Qianjie;CHENG Xiaomin(School of Mechanical Engineering,Ningbo University of Technology,Ningbo 315016,China)

机构地区：[1]宁波工程学院机械工程学院,宁波315016

出　　处：《人工晶体学报》2023年第10期1880-1886,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51275251);宁波市“科技创新2025”重大科技专项(2022Z047,2022Z071,2023Z032)。

摘　　要：以四氯化钛为原料,硫酸铵为分散剂,尿素为前驱物,采用一步溶剂热法成功制备出核壳结构纳米TiO_(2)微球。通过控制溶剂热温度对TiO_(2)微球的结构参数(核壳尺寸、晶粒尺寸、比表面积和孔径等)进行调控,并研究样品光催化降解气相苯的性能。结果表明,随着溶剂热温度的升高,微球核壳逐渐分离,中空结构愈发明显,且均为20 nm以下的纳米颗粒组成的二级结构。此类微球比表面积高达265.4 m^(2)/g,孔隙率高达0.2478 cm^(3)/g,光吸收性能均较P25 TiO_(2)要高,且光吸收带边出现“蓝移”。核壳结构微球表现出吸附协同光催化降解苯的特性,尤其是180℃下制备的样品光催化活性最高,分析表明,该优异性能得益于其核壳结构对光的充分散射和吸收、优良的结晶度,以及较高的比表面积。The core-shell structured nano-TiO_(2)microspheres were successfully prepared by one-step solvothermal method with titanium tetrachloride as raw material,ammonium sulfate as dispersant,and urea as precursor.The structural parameters of TiO_(2)microspheres(including core-shell size,grain size,specific surface area,pore size,etc.)were controlled by the solvothermal temperature.The photocatalytic degradation of gaseous benzene was investigated.The results show that the core and shell of microspheres gradually separates with the increase of solvothermal temperature,and the hollow structure become more obvious,and displays a secondary structure composed of nanoparticles below 20 nm.The specific surface area of the microspheres is up tO_(2)65.4 m^(2)/g,the porosity is up to 0.2478 cm^(3)/g,the light absorption performance is higher than P25 TiO_(2),and the edge of the light absorption band shows"blue shift".The core-shell structure microspheres exhibit adsorption synergistic photocatalytic degradation of benzene,especially the sample prepared at 180℃has the highest photocatalytic activity,the excellent performance may ascribe to the sufficient scattering and absorption of light by the core-shell structure,its excellent crystallinity and high specific surface area.

关 键 词：TiO_(2)微球 核壳结构 溶剂热法 光催化 气相苯 降解 

分 类 号：O649[理学—物理化学] O643[理学—化学]