Degradation of Rhodamine B by Fe@Cu-Ni Material:Mechanism and Degradation Pathway
This study focuses on the synthesis of Fe@Cu-Ni materials by direct reduction for Rhodamine B(Rh B)degrada-tion.Fe@Cu-Ni pairs of the catalytic materials were characterized by SEM,XRD,and XPS.The degradation mechanism of the Fe@Cu-Ni catalyst and the degradation pathway of Rh B were analyzed.The dendritic structure of Fe@Cu-Ni provides divergent paths for electron transport and enrichment,which is conducive to charge transfer.Cu2O on the end of electron transfer channel and Cu with Ni doping played an important role for H2O2 generation through oxygen reduction reaction(ORR).The·OH,which was produced from the catalyzation by in situ H2O2,was a key radicals for Rh B degradation.The intermediate products of Rh B degradation were identified by LC-MS/MS and the degradation intermediates revealed that the degradation function for Rh B mainly resulted from the synergistic action of·H and·OH.The degradation efficiency of Rh B can reach 98.7％at pH=2,Fe@Cu-Ni catalyst dosage of 0.5 g/L,and Rh B concentration of 20 mg/L.The study highlights the potential of Fe@Cu-Ni composites to eliminate dye residues.
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维普
