Construction of NH2-MIL-125(Ti)/Bi2WO6 composites with accelerated charge separation for degradation of organic contaminants under visible light irradiation

摘要

Photocatalysis is considered as an ideal strategy for water pollution treatment. However, it remains challenging to design a highly efficient photocatalytic system through regulating the charge flow via a precise approach. In this work, a novel NHsub2/sub-MIL-125(Ti)/Bisub2/subWOsub6/sub composite was constructed via self-assembly growing Bisub2/subWOsub6/sub nanosheets on NHsub2/sub-MIL-125(Ti) material. The characterization results demonstrated that NHsub2/sub-MIL-125(Ti) was successfully incorporated into Bisub2/subWOsub6/sub and the photoexcited carriers could be efficiently separated and transferred between the two components. NHsub2/sub-MIL-125(Ti)/Bisub2/subWOsub6/sub composites displayed enhanced photocatalytic activity for the removal of rhodamine B (RhB) and tetracycline (TC) under visible light irradiation, and the optimal weight ratio of NHsub2/sub-MIL-125(Ti) was determined to be 7?wt%. The introduction of NHsub2/sub-MIL-125(Ti) into Bisub2/subWOsub6/sub could raise the absorption of visible light, accelerate the separation and transfer of charge carriers, and boost photocatalytic activity. This research presents a wide range of possibilities for the further development of novel composites in the field of environment purification.