MAGNETIC ADSORBENTS BASED ON THE COMPOSITE OF EXPANDED GRAPHITE AND NiFe2O4 FOR REMOVAL OF HEAVY OILS

Pham Van Thinh

Abstract


The oil spill has severely caused environmental damage to ocean water resources resulting in significant negative influence on the ecosystem and putting the life of human at high risk. Hence, the development of efficient and low-cost adsorbents is an instrumental and essential task to purify oil-contaminated water. The corporation of magnetic particles into the adsorbents has recently considered as an innovative approach which facilitate phase separation under a magnetic field thus allowing easy and efficient recovery of the used adsorbents from polluted water in large scale. In this study, the expanded graphite (EG) and magnetic NiFe2O4 based composite prepared from available graphite source of Vietnam has been found as a potential adsorbent to remove crude oil (CO) and diesel oil (DO). The EG/NiFe2O4 was fabricated via a facile two-step process: (1) the expansion of graphite and (2) the decoration of magnetic NiFe2O4 on EG. The physical properties of as-obtained EG/NiFe2O4 were characterized by using Scanning Electron Microscope (SEM), Fourier-Transform Infrared Spectroscopy (FTIR), X-Ray Powder Diffraction (XRD), Vibrating-Sample Magnetometer (VSM) and nitrogen adsorption/desorption analysis. The effect of processing conditions including contact time, dosage of heavy oil and salinity of water on the adsorption capacity of the as-synthesized EG/NiFe2O4 composite for CO and DO was also investigated.


Keywords


adsorbent, oil spills, magnetic expanded graphite (MEG), NiFe2O4.

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DOI: https://doi.org/10.15625/2525-2518/56/1A/12516

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Published by Vietnam Academy of Science and Technology