CAJ | 학술논문

以聚乙烯吡咯烷酮(PVP)、四水合钼酸铵[(NH4)6Mo7O24·4H2O]和偏钒酸铵(NH4VO3)为原料,利用静电纺丝技术结合溶胶-凝胶法制备了在可见光区具有高光催化活性的MoO3/V2 O5异质结构半导体光催化剂.采用X射线衍射光谱( XRD)、傅里叶变换红外光谱( FTIR)、场发射扫描电子显微镜( FE-SEM)、 X射线光电子能谱(XPS)和紫外-可见(UV-Vis)漫反射光谱等测试手段对材料进行了表征.以光降解亚甲基蓝( MB)为模型反应,考察了MoO3/V2 O5异质结构材料的光催化性能.结果表明, n( Mo)/n( V)>1：8时均能形成MoO3/V2 O5异质结构且带隙明显宽于V2 O5,可有效地实现光生电子和空穴的分离,增强体系的量子效率,促进光催化活性的提高,其中n( Mo)/n( V)=1：6时光催化活性最高(达到97.24%),并分析和探讨了光催化机理.
이취을희필각완동(PVP)、사수합목산안[(NH4)6Mo7O24·4H2O]화편범산안(NH4VO3)위원료,이용정전방사기술결합용효-응효법제비료재가견광구구유고광최화활성적MoO3/V2 O5이질결구반도체광최화제.채용X사선연사광보( XRD)、부리협변환홍외광보( FTIR)、장발사소묘전자현미경( FE-SEM)、 X사선광전자능보(XPS)화자외-가견(UV-Vis)만반사광보등측시수단대재료진행료표정.이광강해아갑기람( MB)위모형반응,고찰료MoO3/V2 O5이질결구재료적광최화성능.결과표명, n( Mo)/n( V)>1：8시균능형성MoO3/V2 O5이질결구차대극명현관우V2 O5,가유효지실현광생전자화공혈적분리,증강체계적양자효솔,촉진광최화활성적제고,기중n( Mo)/n( V)=1：6시광최화활성최고(체도97.24%),병분석화탐토료광최화궤리.
MoO3/V2 O5 heterostructures with high photocatalytic activity in visible light region were synthe-sized via electrospinning technique and sol-gel process. The morphologies and structures of MoO3/V2 O5 heterostructures were characterized by X-ray diffraction, field emission scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and UV-visible diffuse reflectance spectros-copy. The photocatalytic performances of MoO3/V2 O5 heterostructures were evaluated by the photodegradation of methylene blue ( MB ) under visible light irradiation. The results indicated that heterojunctions between MoO3 and V2O5 were formed when the n(Mo)/n(V) ratio was above 1:8, and the separation of photogenerat-ed electron-hole pairs on MoO3/V2 O5 heterostructures was promoted, which made the decolorization rate of MB by MoO3/V2 O5 heterostructures much higher than usage of pure V2 O5 nanofibers. The optimum n( V)/n( Mo) ratio of MoO3/V2 O5 heterostructures was found to be about 1:6 and the decolorization rate of MB could be reached 97. 24%. In addition, the photocatalytic mechanism of the MoO3/V2 O5 heterostructures was further analyzed and discussed.