Demulsification of Crude Oil in Water (O/W) Emulsions using Graphene Oxide

Othman, Nur Hidayati; Jahari, Ahmad Fadhil; Alias, Nur Hashimah; Jarni, Husna Hayati; Shahruddin, Munawar Zaman; Irfan, Mohd; Dollah, Aqilah; Halim, Nor Hadhirah

doi:10.1088/1757-899x/458/1/012023

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…GO was synthesized from graphite powder according to the modified Hummer's method [10], which involved oxidation and exfoliation of graphite. In this method, 10 g of graphite powder and 5 g of NaNO3 were added into a 500 ml beaker.…”

Section: Synthesis Of Gomentioning

confidence: 99%

Effect of Magnetic Graphene Oxide on Heavy Oil Demulsification

Dollah¹,

Bakar²,

Othman³

et al. 2022

IJIE

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Chemical demulsification is the most efficient demulsification approach that can attain the desired separation efficiency and meet the environmental regulation standards whilst impose minimal economic burden on the petroleum industry. However, current demulsification methods using chemical demulsifiers suffer from significant secondary pollution, particularly after the demulsification process. Therefore, in this work, magnetic graphene oxide (MGO) was synthesized by a one-step co-precipitation method from graphene oxide (GO). The properties of MGO were then characterized by X-ray diffraction and Fourier transform infrared. MGO was successfully synthesized and used as the demulsifier for diluted heavy oil emulsions. Different MGO concentrations (40, 80, 120, 160, and 200 ppm) were used at different water cuts (20:80, 30:70, 40:60, 50:50, and 60:40 v/v%). Demulsification tests using the bottle test method indicated that MGO could separate the emulsions up to 99.98% efficiency due to the high surface area-to-volume ratio of nanoparticles and magnetic features, which enhanced the adsorptive capacity for separating water from the oil. The residual oil content in the separated water was then analyzed by an ultraviolet-visible spectrophotometer. The oil concentration in the separated water reduced to 398.8 mg/ml, corresponding to a demulsification efficiency of 99.98% observed at 40 ppm MGO concentration. The interfacial tension of the emulsions during demulsification was also analyzed, where the interfacial tension decreased with increasing MGO concentration.

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Section: Synthesis Of Gomentioning

confidence: 99%

Effect of Magnetic Graphene Oxide on Heavy Oil Demulsification

Dollah¹,

Bakar²,

Othman³

et al. 2022

IJIE

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“…4,20 In particular, as a result of the hydrophobic carbon skeleton and hydrophilic carboxyl and hydroxyl groups at the edges of GO sheet, GO could be considered as an amphiphilic surfactant. 21 GO with a characteristic layered nanostructure provided its large number of adsorption sites as a result of huge specific surface area, endowing it superior adsorption performance for the organics and dyes in wastewater. 22 Furthermore, it has displayed superior oil−water separation performance in the field of oil−water emulsion treatment.…”

Section: Introductionmentioning

confidence: 99%

“…Graphene oxide (GO), characteristic layered nanostructure, has obtained comprehensive attention due to its distinctive performance, including tremendous specific surface area, easy functionalization, excellent chemical and mechanical stability, etc. , In particular, as a result of the hydrophobic carbon skeleton and hydrophilic carboxyl and hydroxyl groups at the edges of GO sheet, GO could be considered as an amphiphilic surfactant . GO with a characteristic layered nanostructure provided its large number of adsorption sites as a result of huge specific surface area, endowing it superior adsorption performance for the organics and dyes in wastewater .…”

Section: Introductionmentioning

confidence: 99%

Magnetically Recyclable Graphene Oxide Demulsifier Adapting Wide pH Conditions on Detachment of Oil in the Crude Oil-in-Water Emulsion

Wang

Yang

et al. 2021

ACS Appl. Mater. Interfaces

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In the present work, an amphiphilic and magnetically recyclable graphene oxide (MR-GO) demulsifier was devised and synthesized by graft of magnetic nanoparticles (Fe 3 O 4 @SiO 2 -APTES) and ethylenediamine on the GO surface. The wettability and surface charges of MR-GO under various pH conditions can be regulated via adjusting the contents and species of surface functional groups (such as amino, carboxyl, and hydroxyl). In the demulsificaition test, MR-GO displayed favorable demulsification performance for crude oil-in-water (O/W) emulsion under pH of 2.0−10.0, thusly greatly improving the application scope of common demulsifier. The optimal dosage of MR-GO was 200 mg/L and the demulsification efficiency attained a maximum value of 99.7% for crude O/W emulsion with pH of 6.0. What's more, owing to its magnetic response performance, the MR-GO can be reused and the demulsification efficiency remained above 91.0% after six cycles. Based on the strong interfacial activity, MR-GO can arrive to the crude oil−water interface. With the synergy effects of interfacial adsorption (π−π/n−π) interactions and electrostatic attraction of demulsifier and interfacial films, and the aid of external mechanical forces, the interfacial films stabilized the emulsion were disrupted. Therefore, the oil droplets coated on the water droplets were gathered rapidly to form oily flocs and then migrated to the water surface to accomplish the demulsification of crude O/W emulsion.

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