FeVO4/Cu3(BTC)2(H2O)3异质结制备及光催化性能

Preparation and photocatalytic properties of FeVO4/Cu3(BTC)2(H2O)3 heterojunction

以Cu片和1,3,5-苯三甲酸为原料,电化学法制备经典Cu-MOF材料Cu3(BTC)2(H2O)3,即HKUST-1,作为基底金属有机框架材料(MOFs),采用室温沉积法制备FeVO4/HKUST-1异质结复合材料,通过XRD、SEM、BET、UV-Vis DRS等对其晶体结构、形貌、比表面积、光吸收性能等进行了表征。结果表明:FeVO4与HKUST-1复合形成异质结后,有利于光生电子-空穴的产生和转移,对目标染料污染物罗丹明B(RhB)的降解性能显著增强。可见光照射120 min后,异质结体系中RhB的降解率可达93%,而单一FeVO4或HKUST-1体系中仅为12%和5%。此外,对材料的组成比例进行了优化,当FeVO4与HKUST-1摩尔比为1∶1时,制备的FeVO4/HKUST-1复合材料具有最佳的光催化性能。进一步,考察了其循环使用的稳定性,循环5次后对RhB的降解效率仍保持在90%以上,稳定性良好。

The classic Cu-MOF material Cu3(BTC)2(H2O)3,which was also named HKUST-1,was prepared by electrochemical method using Cu flakes and 1,3,5-benzenetricarboxylic acid as the raw materials.Furthermore,the FeVO4/HKUST-1 heterojunction composites were prepared by room temperature deposition using HKUST-1 as the base metal organic framework material(MOFs).The crystal structure,morphology,specific surface area and optical absorption properties were characterized by XRD,SEM,BET,UV-Vis DRS,etc.The results indicate that the formation of the heterojunction between FeVO4 and HKUST-1 is beneficial for the generation and transfer of the photogenerated electron-hole pairs.The degradation performance of target dye pollutant rhodamine B(RhB)is significantly enhanced.After visible light irradiating for 120 min,the degradation efficiency to RhB can reach 93%in the heterojunction system,while only 12%and 5%can be observed in the system of FeVO4 or HKUST-1,respectively.In addition,the composition ratio of the composite was also optimized.When the molar ratio of FeVO4 to HKUST-1 is 1∶1,the as-prepared FeVO4/HKUST-1 composite has the best photocatalytic performance.Furthermore,the stability was investigated.After 5 cycles,the degradation efficiency to RhB is still above 90%,indicating good stability of the FeVO4/HKUST-1 composite.