Recyclable magnetic graphene oxide for rapid and efficient demulsification of crude oil-in-water emulsion
Recyclable magnetic graphene oxide for rapid and efficient demulsification of crude oil-in-water emulsion
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可回收磁性氧化石墨烯用于原油水包油乳液的快速高效破乳
DOI：
10.1016/j.fuel.2016.10.066
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发表时间：
2017-02-01
期刊：
影响因子：
7.4
通讯作者：
Ren, Sili
中科院分区：
文献类型：
--
作者：
Liu, Juan;Wang, Huanjiang;Ren, Sili
实验证明，氧化石墨烯(GO)纳米片是一种高效、快速、通用的破乳剂，可用于水包原油乳状液和/或乳化含油废水的破乳。为了回收氧化石墨片，避免氧化石墨膜可能对原油造成的污染，本工作成功地合成了磁性氧化石墨烯(M-GO)，并将其用于油水乳状液的分离。破乳试验表明，M-GO可在几分钟内将油水乳状液分离，并循环使用6~7次，且不会失去破乳能力。分离出的水中残余油含量低至10 mg/L，在最佳投加量下，破乳率为99.98%。量子化学计算结果表明，GO材料与沥青质分子之间的pi-pi/sigma-pi相互作用是M-GO纳米片高破乳性能的主要驱动力。这项工作不仅为水包原油乳状液或含油废水的破乳提供了一种很有前途的破乳剂，而且对破乳剂与沥青质之间的内在相互作用有了深入的了解。(C)2016爱思唯尔有限公司。保留所有权利。
Graphene oxide (GO) nanosheets have been experimentally proved to be a highly efficiency, rapid and universal demulsifier to break up the crude oil-in-water emulsion and/or the emulsified oily waste water in our previous study. To recycle the GO nanosheets and avoid the possible contamination of GO for crude oil, in this work, the magnetic graphene oxide (M-GO) was successfully synthesized and used for separating oil/water emulsions. Demulsification tests indicated that M-GO could separate the oil/water emulsions within a few minutes and recycle 6-7 times without losing its demulsification capability. The residual oil content in the separated water was as low as similar to 10 mg/L, corresponding to a demulsification efficiency of 99.98% at an optimal dosage. Quantum chemical calculation results indicated that the pi-pi/sigma-pi interactions between GO materials and asphaltene molecules are the major driven forces for the high demulsification performance of M-GO nanosheets. This work not only provides a promising demulsifies to demulsify the crude oil-in-water emulsion or the oily wastewater but also give a deep understanding on the intrinsic interaction between demulsifiers and asphaltenes. (C) 2016 Elsevier Ltd. All rights reserved.