TY  - JOUR
AV  - none
N1  - cited By 19
SP  - 24003
TI  - Optimization and characterization of magnetite-reduced graphene oxide nanocomposites for demulsification of crude oil in water emulsion
PB  - Royal Society of Chemistry
SN  - 20462069
EP  - 24014
N2  - Oily wastewater from the oil and gas industry negatively affects the environment. Oily wastewater typically exists in the form of an oil-in-water emulsion. Conventional methods to treat oily wastewater have low separation efficiency and long separation time and use large equipment. Therefore, a simple but effective method must be developed to separate oil-in-water emulsions with high separation efficiency and short separation times. Magnetite-reduced graphene oxide (M-RGO) nanocomposites were used as a demulsifier in this work. Magnetite nanoparticles (Fe3O4) were coated on reduced graphene oxide (rGO) nanosheets via an in situ chemical synthesis method. The synthesized M-RGO nanocomposites are environmentally friendly and can be recovered after demulsification by an external magnetic field. M-RGO characterization was performed using X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, field emission scanning microscopy, Raman spectroscopy, and vibrating sample magnetometry. Demulsification performance was evaluated in terms of M-RGO dosage, effects of pH, and brine concentration. The demulsification capability of M-RGO was determined based on the residual oil content of the emulsion, which was measured with a UV-vis spectrometer. The response surface method was used to determine the optimum conditions of the input variables. The optimum demulsification efficiency achieved at pH 4 and M-RGO dosage of 29 g L-1 was approximately 96. This finding demonstrates that M-RGO nanocomposites are potential magnetic demulsifiers for oily wastewater that contains oil-in-water emulsions. Also, the recyclability of this nanocomposite has been tested and the results shown that it is a good recyclable demulsifier. © 2019 The Royal Society of Chemistry.
IS  - 41
ID  - scholars12094
KW  - Efficiency; Emulsification; Emulsions; Fourier transform infrared spectroscopy; Gas industry; Graphene; Iron oxides; Magnetite; Magnetite nanoparticles; Nanocomposites; Ostwald ripening; Spectrometers; Synthesis (chemical); Wastewater treatment; X ray photoelectron spectroscopy
KW  -  Demulsification efficiency; External magnetic field; Field emission scanning; High separation efficiency; Reduced graphene oxides; Reduced graphene oxides (RGO); Response surface method; Vibrating sample magnetometry
KW  -  Demulsification
Y1  - 2019///
A1  - Wai, M.M.
A1  - Khe, C.S.
A1  - Yau, X.H.
A1  - Liu, W.W.
A1  - Sokkalingam, R.
A1  - Jumbri, K.
A1  - Lwin, N.
JF  - RSC Advances
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-85070380832&doi=10.1039%2fc9ra03304a&partnerID=40&md5=0c436566e43962deea48163e0a5ba53d
VL  - 9
ER  -