模板法制备BiOI及其可见光降解有机污染物

BiOI SYNTHETIZED BY TEMPLATE AND ITS DEGRADATION OF ORGANIC POLLUTANTS UNDER VISIBLE LIGHT

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%。

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.