CAJ | 학술논문

以四氯化钛和盐酸为反应介质,利用低温水热法制备纯金红石相纳米TiO_2,考察了反应温度和反应时间对TiO_2微结构及形貌的影响.X射线衍射分析表明所有产物均为纯金红石型纳米TiO_2,晶粒尺寸范围4.0～11.5nm.红外光谱和热重分析表明产物TiO_2存在表面羟基和表面水.TEM分析表明,TiO_2形貌和粒径随反应温度或反应时间变化,反应温度60～80℃时样品呈梭形,且彼此聚集呈束状,但120℃以上时呈粒状,且粒径增加.随反应时间(4～40h)延长,TiO_2呈棒状、梭状及球状变化.此外,还对强酸性及低温水热条件下金红石型纳米TiO_2的形成及形貌变化机理作了初步分析.
이사록화태화염산위반응개질,이용저온수열법제비순금홍석상납미TiO_2,고찰료반응온도화반응시간대TiO_2미결구급형모적영향.X사선연사분석표명소유산물균위순금홍석형납미TiO_2,정립척촌범위4.0～11.5nm.홍외광보화열중분석표명산물TiO_2존재표면간기화표면수.TEM분석표명,TiO_2형모화립경수반응온도혹반응시간변화,반응온도60～80℃시양품정사형,차피차취집정속상,단120℃이상시정립상,차립경증가.수반응시간(4～40h)연장,TiO_2정봉상、사상급구상변화.차외,환대강산성급저온수열조건하금홍석형납미TiO_2적형성급형모변화궤리작료초보분석.
The pure rutile phase nano crystalline TiO_2 particles were prepared by low temperature hydrothermal method using titanium tetrachloride and HCl as reaction media. The effects of reaction temperature and reaction time on the microstructure and the morphology of the TiO_2 particles were investigated. The X-ray diffraction patterns show that all of the TiO_2 samples were pure rutile phase. The average grain size is in the range of 4.0-11.5 nm. Fourier transform infrared spectra and thermogravimetry analysis show that the nano crystalline TiO_2 particles have surface hydroxyl group and surface adsorbed water. Transmission electron microscopy analysis show that the morphology and average particle size of the synthesized rutile nano crystalline TiO_2 particles are strongly effected by both hydrothermal reaction temperature and time. The rutile nano crystalline TiO_2 particles appear shuttle- like shape and are bunched together at the reaction temperature of 60-80℃, however, with temperature increasing to above 120℃ they tend to resolve into spherical particles and increase size. The morphology of the rutile nano crystalline TiO_2 particles change from rod-like to shuttle- like and spherical particles with increase of reaction time from 4h to 40h. The mechanisms of the formation and the morphological transformations of rutile nano crystalline TiO_2 particles in the strong acid and low-temperature hydrothermal conditions were also analyzed.