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

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.

Chitosan-Functionalized Hydroxyapatite-Cerium Oxide Heterostructure: An Efficient Adsorbent for Dyes Removal and Antimicrobial Agent

“…Thus, pH 7 was chosen as the optimum pH value in further experiments. The reported effect of pH on adsorption of CR dye by MgO composite [ 39 ] is in agreement with our study. Furthermore, a recent review report based on the applications of artificial intelligence has captured incredible attention owing to solve future water-related problems [ 40 ].…”

Fabrication of highly efficient encapsulated SnO2@alginate beads as regenerative nanosorbents for anionic dye pollutants removal from aqueous solution

“…[64][65][66] The favorability of the adsorption isotherm was further determined by evaluating the dimensionless separation factor (R L ), using eqn (S6) (ESI †). 67,68 The adsorption process favorability is determined by 0 o R L o 1. 10 It was determined that the value calculated for the adsorption of CR by the synthesized SnO 2 NPs lies within the range of 0 to 1 (R L = 0.000113); thus the adsorption of CR on the adsorbent is determined to be favorable.…”