Preparation of magnetic imprinted graphene oxide composite for catalytic degradation of Congo red under dark ambient conditions

Abstract

Magnetic imprinted N-doped P25/FeO-graphene oxide (MIGNT) was prepared with methyl orange as the dummy template and pyrrole as functional monomer for catalytic degradation of Congo red (CR). Hummers method and the hydrothermal method were used to synthesize FeO-GO and N-doped P25, respectively. The results of adsorption and degradation experiments showed that the adsorption capacity and catalytic degradation ability of the imprinted composite for CR were obviously higher than those of a non-imprinted one. Moreover, the effect factors on degradation efficiency of CR, such as the initial concentration of CR, catalysis time, pH of the solution and temperature, were investigated. The MIGNT was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, a physical property measurement system and a thermal gravimetric analyzer. The degradation products of CR were detected with high performance liquid chromatography and a mass spectrometer. The MIGNT was a brand-new imprinted composite and had high degradation efficiency for CR under dark ambient conditions. The MIGNT could be recycled conveniently, due to its magnetic property, and could be used as an effective, environmentally friendly and low-cost catalytic degradation material for the treatment of water contaminated by CR.

Thermal catalysis under dark ambient conditions in environmental remediation: Fundamental principles, development, and challenges

“…The results showed that the catalyst could rapidly degrade CR and is easily recycled. The degradation mechanism resembled that of the MIGNT catalyst [66].…”

“…Magnetic materials have intrinsic advantages over non-magnetic ones as heterogeneous catalysts due to the facile magnetic separation of the catalysts from the reaction system after the catalytic process. For this purpose, Yang and co-workers [66] synthesized magnetic imprinted N-doped P25/F3O4-graphene oxide (MIGNT) and used it as a heterogeneous catalyst to degrade congo red (CR) under dark ambient conditions. The material had a high degradation efficiency for CR and could be recycled conveniently due to the magnetic properties of Fe3O4.…”

Magnetic Graphene Oxide as a Carrier for Lipases Immobilization: An Approach for Hydrolysis of Olive Oil Emulsion

“…13,14 The magnetic properties of iron oxide nanoparticles (MNP) are reported in several investigations, [15][16][17] resulting in a lower cost synthesis when compared to other metal oxides. 16,18,19 Decoration of the GO sheets with MNP had also been studied in order to obtain magnetic graphene oxide (MGO). [20][21][22] The GO characteristics such as low toxicity, thermal stability and hydrophilic property, when combined with magnetic properties from MNP on its surface, become a potential composite for relevant studies and new applications.…”