Fluorinated-Polyether-Grafted Graphene-Oxide Magnetic Composite Material for Oil–Water Separation

Abstract

In this study, a new type of highly efficient and recyclable magnetic-fluorine-containing polyether composite demulsifier (Fe3O4@G-F) was synthesized by the solvothermal method to solve the demulsification problem of oil–water emulsion. Fe3O4@G-F was successfully prepared by grafting fluorinated polyether onto Fe3O4 and graphene-oxide composites. Fe3O4@G-F was characterized using scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Taking the self-made crude-oil emulsion as the experimental object, the demulsification mechanism of the demulsifier and the influence of external factors, such as the temperature and pH value, on the demulsification performance of the demulsifier are discussed. The results show that the demulsification efficiency of the Fe3O4@G-F emulsion can reach 91.38% within 30 min at a demulsifier dosage of 750 mg/L, pH of 6, and a demulsification temperature of 60 °C. In neutral and acidic environments, the demulsification rate of the demulsifier is more than 90%. In addition, Fe3O4@G-F has been proven to have good magnetic effects. Under the action of an external magnetic field, Fe3O4@G-F can be recycled and reused in a two-phase system four times, and the demulsification efficiency is higher than 70%. This magnetic nanoparticle demulsifier has broad application prospects for various industrial and environmental processes in an energy-saving manner.

Synthesis, Characterization, and Environmental Applications of Novel Per-Fluorinated Organic Polymers with Azo- and Azomethine-Based Linkers via Nucleophilic Aromatic Substitution

“…In line with the aforementioned hypothesis, the polymers with a high fluorine loading exhibited a significant hydrophobic nature, which makes them promising adsorbents for benzene. A similar study has used fluorinated polyethers supported by graphene oxide surfaces for the separation of oil and water [54]. Conversely, the cross-linked polymers with low fluorine contents contain reactive C-F bonds and high nitrogen contents, making them potentially effective adsorbents for phenol as a polar solvent.…”

“…The initial response of these polymers towards benzene adsorption during the first 30 min can be attributed to the presence of accessible C-F sites that possess a diminished dipole moment Figure S15. Phenol is a harmful polar organic pollutant commonly found in water, posing a significant threat to both humans and aquatic life [54]. Thus, its presence in the water must be restricted.…”

“…In contrast, DAB-A-1h and DAB-Z-1h, which were formed through the reactive NAS and have low fluorine and high nitrogen contents, a moderate surface area, and flexible chains, showed improved interactions with phenol, as depicted in Figure 10C,D. Phenol is a harmful polar organic pollutant commonly found in water, posing a significant threat to both humans and aquatic life [54]. Thus, its presence in the water must be restricted.…”

ZnFe2O4/Zeolite Nanocomposites for Sorption Extraction of Cu2+ from Aqueous Medium

“…to create new sorption-active materials and improve waste-free production technologies [5][6][7][8]. As a trend, the novel materials being created are composite and/or hybrid materials, both organoinorganic and inorganic-organic [9,10], which acquire new functionality during synthesis. In thistrend, it is possibleto combine such properties as a developed surface and porosity with outstanding physical and chemical activity, sorption and catalytic ability, electrical and magnetic properties, biological activity, strength characteristics, stability in various media, etc.…”