【摘要】 以表面活性剂十六烷基硫酸吡啶(Cetyl pyridine sulfuric acid,CPSA)为模板,通过水热法制备具有片状结构的BiOI。用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、比表面积及孔径分析仪(BET)、紫外-可见反射吸收光谱(UV-Vis)对其进行表征。在可见光(λ>420nm)照射下,研究BiOI对染料罗丹明B(Rhodamine B,RhB)及无色小分子4-氯苯酚(4-Dichlorophenol,4-CP)光催化降解特性,在分别光照4h和28h后对RhB及4-CP光催化降解率达到100%。通过电子自旋捕获技术(EPR)和一系列添加·OH、O·-2和h+捕获剂的对比试验,推断其氧化过程主要涉及空穴直接氧化。另外,还测定了RhB降解过程中红外光谱(IR)和总有机碳(TOC)的变化,在光照20h后其TOC约降低90%。更多还原

【Abstract】 BiOI nano-plates were synthetized via using surfactants Cetyl pyridine sulfuric acid( CPSA) as templates by the method of hydrothermal. X-ray diffraction( XRD), scanning electron microscope( SEM),transmission electron microscopy(TEM),specific surface area,pore size analyzer(BET) and ultraviolet-visible absorption spectral reflection( UV-Vis) were employed to characterize the catalysts. Under visible irradiation(λ >420nm),BiOI was used to degrade dye Rhodamine B(RhB) and 4-Dichlorophenol(4-CP),which were degraded totally after illuminating 4h and 20 h, respectively. Electronic spin capture technology( EPR) and contrast tests by adding scavengers of·OH、O·-2 and h+were employed to prove the oxidation process mainly involved hole direct oxidation. In addition,the changes of infrared spectrometry( IR) and total organic carbon(TOC) were measured,and TOC decreased 90% after lighting 20 h.更多还原