Facile and Scalable Preparation of Graphene Oxide-Based Magnetic Hybrids for Fast and Highly Efficient Removal of Organic Dyes

Abstract

This study reports the facile preparation and the dye removal efficiency of nanohybrids composed of graphene oxide (GO) and Fe3O4 nanoparticles with various geometrical structures. In comparison to previously reported GO/Fe3O4 composites prepared through the one-pot, in situ deposition of Fe3O4 nanoparticles, the GO/Fe3O4 nanohybrids reported here were obtained by taking advantage of the physical affinities between sulfonated GO and Fe3O4 nanoparticles, which allows tuning the dimensions and geometries of Fe3O4 nanoparticles in order to decrease their contact area with GO, while still maintaining the magnetic properties of the nanohybrids for easy separation and adsorbent recycling. Both the as-prepared and regenerated nanohybrids demonstrate a nearly 100% removal rate for methylene blue and an impressively high removal rate for Rhodamine B. This study provides new insights into the facile and controllable industrial scale fabrication of safe and highly efficient GO-based adsorbents for dye or other organic pollutants in a wide range of environmental-related applications.

A facile Pechini sol–gel synthesis of TiO2/Zn2TiO2/ZnO/C nanocomposite: an efficient catalyst for the photocatalytic degradation of Orange G textile dye

“…Thus, many researchers have devoted much of their research work to the treatment of wastewater of the textile industries before the disposal process. [7][8][9] To date, different chemical, biological, and physical procedures have been proposed for the removal of pollutants from wastewater including chemical oxidation, precipitation, reverse osmosis, ltration, membrane process, solvent extraction, adsorption, electrochemical and ultrasonic technique, biological treatment, and coagulation. 6,[10][11][12][13][14][15] On the other hand, the photocatalytic degradation process has proven its efficiency for the removal of various textile dyes.…”

A Simple and Scalable Method for the Preparation of Magnetite/Graphene Oxide Nanocomposites under Mild Conditions

“…Although the coprecipitation [33,34] and chemical grafting [35,36] methods have been used under relatively mild conditions (∼80°C reaction temperature), the presence of bases at elevated temperatures inevitably results in partial deoxygenation of the GO framework [37,38]. Another, more viable strategy is the preliminary functionalization of the magnetite nanoparticles [39], sulfonation of graphene oxide [40], or derivatization of both constituents by coupling azide-modified MNPs with alkyne-functionalized GO as reported by Namvari and Namazi [41]. e drawback of such routes is that they often require more tedious and complicated operations.…”

Fe3O4 nanoparticles on graphene oxide sheets for isolation and ultrasensitive amperometric detection of cancer biomarker proteins

“…Fe 3 O 4 loaded on GO was previously synthesized and utilized for removal of cobalt (Liu et al, 2011), hydrocarbons (Han et al, 2012) and organic dyes (Jiao et al, 2015) from environmental samples. Electrostatic interactions between negatively charged graphene oxide sheets and Fe 3 O 4 nanoparticles coated with positively charged poly(diallydimethylammonium chloride) (PDDA) were used to assemble core-shell Fe3O4@GO particles (Wei et al, 2012).…”