离子液体辅助合成CdMoO_4微球体及其光催化性能

Ionic liquid-assisted synthesis and photocatalytic activities of CdMoO_4 microspheres

分别以1 mL 1-正丁基-3-甲基咪唑氯盐([Bmim]Cl)(离子液体Ⅰ)和1 mL 14,-双(N-甲基咪唑)丁烷溴盐([C4(Mim)2][Br]2)(离子液体Ⅱ)为辅助剂,CdCl2与Na2MoO4在60℃下反应1 h制备了单分散性较好的圆球状和椭球状的CdMoO4,并利用X射线衍射仪、扫描电子显微镜对产物的组成和形貌进行了表征。结果表明,在2种条件下制备的产物均为四方晶相的CdMoO4,但其大小有所差异。以紫外光灯为光源,2种不同离子液体合成的CdMoO4微球为光催化剂,对有机染料罗丹明B进行了光降解实验。研究发现,利用双阳离子液体合成的CdMoO4微椭球具有更高的光催化活性,经过60 min其光降解率达到了98.9%。

CdMoO4 microspheres and microellipsoids have been synthesized respectively by a method at 60 ℃ for 1 h from CdCl2 and Na2MoO4 in the presence of 1 mL Cl and [C4（Mim）2]2.X-ray diffraction（XRD） and scanning electric microscopy（SEM） were used to characterize the structures and morphologies.The results showed that the samples obtained via various ionic liquids were all CdMoO4 with tetragonal structures,but the sizes were different.The photocatalytic activity of these two kinds of CdMoO4 was evaluated by measuring the photograduation of a solution of RhB under exposure to UV light.It was obvious that CdMoO4 microspheres synthesized by dicationic ionic liquid exihibited more excellent photocatalytic efficiency compared with the other one.After 60 min of reaction,the photodegraduation efficiency of RhB reached 98.9%.