A novel Bi3.64Mo0.36O6.55/MIL-88A(Fe) nanorod composite material for enhancing photocatalytic activity in photo-Fenton system

Constructing the Bi3.64Mo0.36O6.55/MIL-88A(Fe) photo-Fenton degradation system with the in situ growth of Bi3.64Mo0.36O6.55 nanoparticles onto monomer MIL-88A(Fe). The composite was applied as the photocatalyst for removing tetracycline hydrochloride (TCH). The degradation rate reaches 84.48% within 30 min under visible light and the presence of H2O2, which is 1.67 times faster than that of monomer MIL-88A(Fe). The effects of pollution concentration, the consistence of H2O2, pH value and catalyst dosage of photo-degradation were explored over this process. After four cycling, Bi3.64Mo0.36O6.55/MIL-88A(Fe) exhibited excellent photocatalytic property. The catalyst also exists selectivity to Rhodamine B and methyl orange. The special layered structure of Bi3.64Mo0.36O6.55/MIL-88A(Fe) composites can effectively promote photogenerated charge transfer and accelerate the Fe3+/Fe2+ cycling effect, which was performed by electrochemical impedance spectroscopy (EIS). Furthermore, free radical capture experiment and electron spin resonance (ESR) analysis showed that •OH, h+ and •O2– showed master roles in removal of tetracycline hydrochloride. Suitable energy band structure produced more photogenerated electrons, which could promote the Fe3+/Fe2+ transformation and accelerate the system degradation of TCH. This study has provided a novel method to construct the significant potential of the Bi3.64Mo0.36O6.55/MIL-88A(Fe) photo-Fenton system in the degradation of pollutants.