(沈阳理工大学 环境与化学工程学院，沈阳 110159)
摘 要: 以玉米秸秆为模板，采用溶胶-凝胶法制备S掺杂FeVO4光催化剂，并通过X射线衍射(XRD)、扫描电镜(SEM)、样品比表面积分析(BET)、X射线光电子能谱分析(XPS)和紫外可见吸收光谱(UV-Vis)等测试手段，对样品进行表征。结果表明：S掺杂前后光催化剂均为三斜型，掺杂后样品的表面形貌产生了变化，比表面积轻微增大；掺杂的S取代FeVO4晶格氧，生成更多的氧空位及Fe2+，同时增强样品的光吸收性能。在可见光照射下，通过光催化降解甲基橙溶液评价S掺杂对FeVO4光催化剂活性的影响，当S掺杂(摩尔比)为6%时，FeVO4对甲基橙溶液的脱色率较未掺杂前提高约49%。
关键字: S掺杂；FeVO4；可见光光催化；溶胶-凝胶法
（College of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China）
Abstract:S-doped FeVO4 photocatalysts were successfully prepared by sol-gel method taking the corn stem as template and characterized with X-ray diffraction (XRD), scanning electron microscope (SEM), specific surface area (BET), X-ray photoelectron spectroscopy (XPS) and UV-vis absorption spectroscopy (UV-Vis). The results demonstrate that all the FVO or S/FVO photocatalysts consist of triclinic phase, S doping has great influence on morphology but little on specific surface area. XPS spectra show that S doping replaces the subsistent O, and S-Fe-O form. The photocatalytic activity was evaluated via visible-light by photocatalytic oxidation of methyl orange (MO). The results of photocatalytic degradation to methyl orange show that S doping can improve the photocatalytic activity and the MO decoloration rate is more 49% than that of pure FeVO4 when S doping is 6%.
Key words: S-doping; FeVO4; visible-light photocatalysis; sol-gel method
