【摘要】 以钛酸四正丁酯（TBOT）、盐酸、硫酸等试剂为原料,通过水热法在不同酸性和温度条件下分别制备锐钛矿（anatase）相和金红石（rutile）相的Ti O₂纳米粉体,并分别对不同相型的Ti O₂进行二次水热处理.二次水热的条件与一次水热的条件互补,旨在研究二次水热对Ti O₂纳米粉体光催化制氢性能的影响及探讨混合相Ti O₂纳米粉体光催化制氢的性能.对一次水热和二次水热所得的纳米粉体进行X线粉末衍射（XRD）、拉曼光谱（Raman）、比表面积（BET）、光致发光光谱（PL）、紫外可见漫反射光谱（UV-Vis）及高分辨透射电子显微镜（TEM）表征,对实验所得粉体分别进行光催化分解水制氢的实验.光催化结果表明,在相同条件下,锐钛矿相Ti O₂纳米粉体进行二次水热后,光催化制氢效率提高,约是一次水热时的5倍;而金红石相Ti O₂纳米粉体经过二次水热后,光催化制氢效率降低,约是一次水热时的2/5.二次水热反应的酸性环境对催化剂的二次生长和所制备的粉末样品的光催化性能有决定性的影响.更多还原

【Abstract】 Anatase and rutile Ti O₂nano-powder has been synthesized by hydrothermal method with different acidity and temperature using tetrabutyl titanate（TBOT）,hydrochloric acid and sulfuric acid as the source material.A twice-hydrothermal-process has been adopted in the preparation of anatase or rutile powder,influence of the twice hydrothermal process on the photocatalytic hydrogen production performance of Ti O₂was investigated.The powder synthesized through the first and the second hydrothermal process was characterized by X-ray powder diffraction（XRD）,Raman spectra,BET surface area by nitrogen adsorption,photoluminescence（PL）,diffuse reflectance ultraviolet-visible spectra（UV-Vis）,transmission electron microscopy（TEM）and high-resolution transmission electron microscopy（HRTEM）.Hydrogen production performance of the synthesized Ti O₂photocatalyst was characterized via water splitting.The results show that,after experienced the twice hydrothermal process,the H₂production rate of anatase has been improved about five times comparing to that of the first process,while the H₂production rate of rutile is reduced to 2/5 of the first process.The results offer new insight of producing high efficient photocatalyst for water splitting by the simple twice hydrothermal process to anatase Ti O₂photocatalyst.更多还原