Boosted Cr(VI) reduction performance over Cu2O/NH2-MIL-125 heterocomposite prepared via solution method

摘要

Metal-organic framework (MOF)-based heterocomposites have been widely applied as photocatalyst because they can supplement the shortcomings of single-phase MOF photocatalyst. In this article, we prepared Cu2O/NH2-MIL-125 heterocomposite via the reaction between NH2-MIL-125 and Cu(NO3)(2) aqueous solution under room temperature. As indicated in the electron microscope investigation, the diameter of NM is about 182 nm, and the size of Cu2O nanoparticles is about 5 nm. The Cu2O/NH2-MIL-125 heterocomposite demonstrated higher performance compared with NH2-MIL-125, and the highest Cr (VI) degradation efficiency is determined as similar to 1.5 times as great as that of NH2-MIL-125. The improved photocatalytic activities of Cu2O/NH2-MIL-125 could be ascribed to the improved charge separation efficient and decreased carriers' transfer resistance. Based on the radical species trapping experiment and electron paramagnetic resonance (EPR) measurement, a type-II heterojunction mechanism was proposed for the improved photocatalytic activity over the Cu2O/NH2-MIL-125 heterocomposite.