Persulfate enhanced visible light photocatalytic degradation of organic pollutants by construct magnetic hybrid heterostructure

In this study, three kinds of magnetic visible light photocatalysts (Fe3O4/GCN) were successfully prepared by a two-step method. The maximum magnetic property of the as-prepared composite was Fe3O4-op/GCN-3, with a maximum magnetization of 13.77 emu/g. Fe3O4/GCN exhibits excellent visible-light-driven photocatalytic activity for the degradation of organic pollutants. Among them, with regard to Fe3O4-ht/GCN-2, it was found that the degradation rate of MB is 2.37 times higher than that of GCN under visible light condition. On the one hand, one of the mechanisms for enhancing photocatalytic effect of composite material is the decrease of the band gap width. On the other hand, the generated photoelectrons can be transferred to Fe3O4 nanoparticles, which can effectively reduce the recombination of photogenerated electron-hole pairs. And the Fe3O4/GCN thorn visible light hybrid activation systems exhibited higher significant efficiency for organic pollutants degradation combined with PS. The maximum removal rate of MB, AB I, BP-5R, TC and BPA can reach 96.69%, 89.34%, 81.62%, 62.57% and 53.21%, respectively. This is mainly due to the hybrid activation system under visible light radiation can significantly accelerate the activation rate of S2O82-. The trapping experiment results investigations suggested that SO4 center dot- and h(+) are the main radical species in photocatalytic decomposition process. In addition, center dot OH species were then generated from the reduction of SO4 center dot- by photo-electron. (C) 2019 Elsevier B.V. All rights reserved.