CAJ | 학술논문

钨酸铋在水相体系中能光催化降解有机污染物,而对于钨酸铋光催化活性影响因素的研究非常少.本文研究了煅烧温度对花朵状钨酸铋光催化活性的影响.以钨酸钠和硝酸铋为原料,在160°C下水热反应20 h,合成催化剂,并经不同温度煅烧3 h.用X射线衍射(XRD)、拉曼(Raman)光谱、紫外-可见漫反射吸收光谱(UV-Vis DRS)和荧光(PL)光谱表征样品.结果表明,这些样品具有十分相似的相组成和电子结构.然而,对于水中苯酚的降解,钨酸铋的光催化活性显示出了很大的差异.钨酸铋的光催化活性随着煅烧温度的升高,先上升后下降,最优煅烧温度为350°C,并且不受样品比表面积大小的影响.这些样品的活性差异主要归结于钨酸铋的结晶度、吸光性和表面缺陷对其光生载流子分离效率的综合影响.
오산필재수상체계중능광최화강해유궤오염물,이대우오산필광최화활성영향인소적연구비상소.본문연구료단소온도대화타상오산필광최화활성적영향.이오산납화초산필위원료,재160°C하수열반응20 h,합성최화제,병경불동온도단소3 h.용X사선연사(XRD)、랍만(Raman)광보、자외-가견만반사흡수광보(UV-Vis DRS)화형광(PL)광보표정양품.결과표명,저사양품구유십분상사적상조성화전자결구.연이,대우수중분분적강해,오산필적광최화활성현시출료흔대적차이.오산필적광최화활성수착단소온도적승고,선상승후하강,최우단소온도위350°C,병차불수양품비표면적대소적영향.저사양품적활성차이주요귀결우오산필적결정도、흡광성화표면결함대기광생재류자분리효솔적종합영향.
Bi2WO6 is reportedly active for the photocatalytic degradation of organic compounds in aerated aqueous solution, but factors influencing the photocatalytic activity of pristine Bi2WO6 have received little attention. In this study, the effect of sintering temperature on the physical properties of flower-like Bi2WO6 was investigated. The catalyst was synthesized through the hydrothermal reaction of Na2WO4 and Bi(NO3)3 at 160 ° C for 20 h, fol owed by sintering in air at different temperatures for 3 h. Bi2WO6 samples were characterized with X-ray diffraction, scanning electron microscopy, and Raman, ultraviolet-visible diffuse reflectance, and photoluminescence spectroscopies. Al samples had similar phase compositions and electronic structures. Samples exhibited different activities for the photocatalytic degradation of phenol in aerated aqueous solution, under ultraviolet light. With increasing Bi2WO6 sintering temperature, the rate of phenol degradation first increased and then decreased. The maximum rate of phenol degradation was observed from the catalyst sintered at 350 ° C. Similar results were obtained when the rate of phenol degradation was normalized with the specific surface area of the catalyst, as determined by N2 adsorption. The observed sintering temperature-dependent photoactivity of Bi2WO6 was attributed to a combination of its crystal inity, light absorption, and surface defects.