Highly Efficient Removal of Suspended Solid Pollutants from Wastewater by Magnetic Fe₃O₄‐Graphene Oxides Nanocomposite

Abstract

In this work, the magnetic Fe3O4‐graphene oxide (Fe3O4‐GO) nanocomposite is synthesized via a facile one‐pot hydrothermal method and used for settling down and removing solid suspended particles in wastewater. Physicochemical characterizations not only confirm the successful in‐situ deposition of magnetic Fe3O4 nanoparticles on GO nanosheets, but also disclose the strong interaction between them. The Fe3O4‐GO nanocomposite demonstrates an excellent capability of accelerating the settling process in the presence of magnetic field. It can reduce the Kaolinite solid particle concentration by an order of magnitude within 30 minutes, which is one time faster than that in the absence of magnetic field. The solid suspension absorbing behavior on the Fe3O4‐GO nanocomposite in the presence of magnetic field is found to fit with Langmuir and Freundlich isotherm models and the pseudo‐second‐order kinetic model. The calculated adsorption capacity reaches 58.46 mg⋅mg−1, and the initial adsorption rate reaches as high as 0.0275 mg⋅mg−1⋅min−1. The Fe3O4‐GO nanocomposite is proved to be an effective, efficient and promising magnetic coagulant for the rapid treatment of solid suspended particles in wastewater and natural water.

Effective Removal of Hexavalent Chromium from Aqueous Solutions Using Quaternary Ammonium-Functionalized Magnetic Graphene Oxide Composites

“…trum of M-PAS-GO, which differs from that of GO and is consistent with that of Fe3O4, thus can be related to the vibration of Fe-O functional groups [40]. Moreover, peaks at 1625 cm −1 and 1147 cm −1 which related to the C=O and C-N group, respectively, was also observed in this study.…”

“…The peaks at 1730, 1625 and 1100 cm −1 were observed in the spectrum of GO, which correspond to stretching of the C=O bond of carboxyl groups, the vibrations of skeletal C=C in GO and alkoxy C-O, respectively [39]. The new peak at 575 cm −1 was observed in the FTIR spectrum of M-PAS-GO, which differs from that of GO and is consistent with that of Fe 3 O 4 , thus can be related to the vibration of Fe-O functional groups [40]. Moreover, peaks at 1625 cm −1 and 1147 cm −1 which related to the C=O and C-N group, respectively, was also observed in this study.…”

Application of Fe₃O₄@Carbon/Graphene Oxide Nanocomposites for Cu(II) Removal from Wastewater

“…The saturated adsorption capacities of Fe3O4@C-G1, Fe3O4@C-G2 and Fe3O4@C-G3 are 315.7, 350.4, and 350.4 mg/g, respectively. The reasons for rapid adsorption speed and high adsorption capacity may originate from the structural characteristics of the nanocomposites: 1) the well dispersion; 2) the large pore size; 3) fully exposed surface; 4) the effectively synergistic effect between GO and starch-based carbon [59][60][61]. Furthermore, excessive GOs lead to their assembling that will cover some adsorption sites.…”