片状铋/钒酸铋复合催化剂的制备及其光催化性能

Synthesis and photocatalytic performance of sheet-like Bi/BiVO4 composite catalyst

用溶剂热法合成了一系列不同铋含量的片状铋/钒酸铋(Bi/BiVO4)复合光催化剂。采用X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、紫外-可见漫反射光谱(UV-vis DRS)、电感耦合等离子发射光谱(ICP-OES)、氮气吸附脱附和光电流响应等技术对所制备的催化剂进行了表征。通过氙灯下光催化降解亚甲基蓝的性能来评价样品的光催化活性,实验结果表明铋的自掺杂能显著提高钒酸铋的光催化活性。最后,通过自由基捕获实验对铋/钒酸铋光催化机理进行了探讨。

A series of sheet-like Bi/BiVO4 composite photocatalysts with different Bi contents were synthesized using solvothermal method.The prepared catalysts were characterized by using X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM),transmission electron microscopy(TEM),ultraviolet-visible diffuse reflection spectroscopy(UV-Vis DRS),inductively coupled plasma optical emission spectroscopy(ICP-OES),nitrogen adsorption-desorption analysis and photocurrent response measurements.The photocatalytic performance of the sample was assessed by photodecomposition of methylene blue(MB)under xenon lamp irradiation.The results showed that the photocatalytic activity of BiVO4 was enhanced significantly with Bi self-doping.Finally,the photocatalytic reaction mechanism of Bi/BiVO4 composite was discussed by free radical capture experiments.