A Novel Fe3O4/Graphene Oxide Composite Prepared by Click Chemistry for High-Efficiency Removal of Congo Red from Water

Hongliu Jiang,Fuan He,Zewu Xie,Yao Cao,Fengtao Zeng,Thathan Premkumar

doi:10.1155/2021/9716897

Abstract

In this paper, a magnetic graphene oxide (MGO) composite was prepared by the click reaction between the alkyne-modified Fe3O4 nanoparticles and the azide-modified graphene oxide for the purpose of removing the Congo red (CR) dye from water. The deposition of the Fe3O4 nanoparticles on the graphene oxide to successfully prepare the MGO composite was evidenced by the Fourier-transform infrared spectrometer, wide-angle X-ray diffraction equipment, scanning electron microscope, thermal gravimetric analyzer, and Raman spectrometer. The value of saturation magnetization for the MGO composite was 34.9 emu/g. The CR absorption capacities of the MGO composite increased first and then decreased as the pH value increased. It was found that the maximum adsorption capacity of the MGO composite for the CR was as high as 769.2 mg/g. In the absorption-desorption experiment, the CR absorption capacities of the MGO composite from the second cycle to the fifth cycle remained stable to be about 130 mg/g. Moreover, both the Langmuir model for the adsorption isotherm and the pseudo-second-order kinetic model could be used to describe the CR absorption behaviors of the MGO composite.

Highlights

The problem of wastewater caused by organic dyes has aroused great concern and became an urgent event to be solved
Characterization of the magnetic graphene oxide (MGO) Composite. It could be clearly observed from the scanning electron microscope (SEM) images of the MGO composite that a lot of Fe3O4 nanoparticles had been homogeneously attached on the surface of graphene oxide (GO), which intuitively confirmed the formation of the magnetic Fe3O4/GO composite after the click reaction
The successful attachment of the Fe3O4 nanoparticles onto the GO surface was testified by Fourier-transform infrared (FTIR), wide-angle X-ray diffraction (WAXD), SEM, and Raman spectrum, and vibrating sample magnetometer (VSM)

Summary

Introduction

The problem of wastewater caused by organic dyes has aroused great concern and became an urgent event to be solved. The commonly used technologies for the dye treatment of wastewater include biological treatment, coagulation/flocculation treatment, ozone treatment, chemical oxidation, membrane separation, and photocatalytic degradation [1,2,3,4,5,6]. The above methods have some advantages such as good decontamination ability, high efficiency, and convenient operation, they will consume enormous energy or have poor repeatability. The adsorption method exhibited great potential for the treatment of wastewater containing various dyes [10,11,12]. The adsorption capacity of the resultant composite for the Congo red (CR) dye reached as high as

Methods

Results

Conclusion