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Demulsification of Crude Oil-in-Water Emulsions Driven by Graphene Oxide Nanosheets
Liu, Juan1,2; Li, Xiaocheng3; Jia, Weihong1; Li, Zhiyun1,2; Zhao, Yapu4; Ren, Sili1; Ren, SL (reprint author), Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China.
Source PublicationENERGY & FUELS
2015-07-01
Volume29Issue:7Pages:4644-4653
ISSN0887-0624
AbstractSeeking highly efficient, rapid, universal, and low-cost demulsification materials to break up the crude/heavy oil-in-water emulsion and emulsified oily wastewater at ambient conditions has been the goal of the petroleum industry. In this work, an amphiphilic material, graphene oxide (GO) nanosheets, Was introduced as a versatile demulsifier to break up the oil-in-water emulsion at room temperature. It was encouraging to find that the small oil droplets in the emulsion quickly coalesced to form the oil phase and separated with the water within a few minutes. The demulsification tests indicated that the residual oil in separated water samples was as low as similar to 30 mg/L, corresponding to a demulsification efficiency over 99.9% at an optimum GO dosage. More importantly, GO not only is useful for ordinary crude oil emulsion but also can be used to break up the extra heavy oil emulsion. The effect of the emulsion pH on the demulsification was also investigated. It was interesting to find that the. distribution of GO either in oil or in water phase after demulsification was dependent on the pH value of the solution, which was attributed to the pH-dependent amphiphilicity of GO. The prominent demulsification ability of GO was attributed to the strong adsorption between the GO nanosheets and molecules of asphaltenes/resins driven by pi-pi interactions and/or n-pi interactions. The findings in this work indicate that the GO nanosheets are a simple, highly efficient, and universal demulsifier to separate the oil from the crude/heavy oil-in-water emulsions at ambient conditions, which shows a good application prospect in the oil industry.; Seeking highly efficient, rapid, universal, and low-cost demulsification materials to break up the crude/heavy oil-in-water emulsion and emulsified oily wastewater at ambient conditions has been the goal of the petroleum industry. In this work, an amphiphilic material, graphene oxide (GO) nanosheets, Was introduced as a versatile demulsifier to break up the oil-in-water emulsion at room temperature. It was encouraging to find that the small oil droplets in the emulsion quickly coalesced to form the oil phase and separated with the water within a few minutes. The demulsification tests indicated that the residual oil in separated water samples was as low as similar to 30 mg/L, corresponding to a demulsification efficiency over 99.9% at an optimum GO dosage. More importantly, GO not only is useful for ordinary crude oil emulsion but also can be used to break up the extra heavy oil emulsion. The effect of the emulsion pH on the demulsification was also investigated. It was interesting to find that the. distribution of GO either in oil or in water phase after demulsification was dependent on the pH value of the solution, which was attributed to the pH-dependent amphiphilicity of GO. The prominent demulsification ability of GO was attributed to the strong adsorption between the GO nanosheets and molecules of asphaltenes/resins driven by pi-pi interactions and/or n-pi interactions. The findings in this work indicate that the GO nanosheets are a simple, highly efficient, and universal demulsifier to separate the oil from the crude/heavy oil-in-water emulsions at ambient conditions, which shows a good application prospect in the oil industry.
DOI10.1021/acs.energyfuels.5b00966
URL查看原文
Indexed BySCI
Language英语
WOS IDWOS:000360026900070
WOS KeywordPI-PI INTERACTIONS ; WASTE-WATER ; HEAVY OIL ; BITUMEN EXTRACTION ; SPILL CLEANUP ; IONIC LIQUIDS ; STABILITY ; SANDS ; DESTABILIZATION ; PERFORMANCE
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Chemical
Funding OrganizationWe acknowledge the financial support offered by the National Natural Science Foundation of China (Grant No. 51374195) and the "Top Hundred Talents Program" offered by the Chinese Academy of Sciences.
DepartmentLNM纳/微系统力学与物理力学
Classification二类/Q1
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/55779
Collection非线性力学国家重点实验室
Corresponding AuthorRen, SL (reprint author), Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China.
Affiliation1.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Lanzhou Inst Chem Phys, Lab Clean Energy Chem & Mat, Lanzhou 730000, Peoples R China
4.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Liu, Juan,Li, Xiaocheng,Jia, Weihong,et al. Demulsification of Crude Oil-in-Water Emulsions Driven by Graphene Oxide Nanosheets[J]. ENERGY & FUELS,2015,29(7):4644-4653.
APA Liu, Juan.,Li, Xiaocheng.,Jia, Weihong.,Li, Zhiyun.,Zhao, Yapu.,...&Ren, SL .(2015).Demulsification of Crude Oil-in-Water Emulsions Driven by Graphene Oxide Nanosheets.ENERGY & FUELS,29(7),4644-4653.
MLA Liu, Juan,et al."Demulsification of Crude Oil-in-Water Emulsions Driven by Graphene Oxide Nanosheets".ENERGY & FUELS 29.7(2015):4644-4653.
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