石墨烯
乳状液
破乳剂
材料科学
纳米复合材料
磁铁矿
磁铁矿
氧化物
化学工程
傅里叶变换红外光谱
废水
拉曼光谱
纳米技术
废物管理
冶金
工程类
物理
光学
作者
Mun Mun Wai,Cheng Seong Khe,Xin Hui Yau,Weiwen Liu,Rajalingam Sokkalingam,Khairulazhar Jumbri,Nilar Lwin
出处
期刊:RSC Advances
[The Royal Society of Chemistry]
日期:2019-01-01
卷期号:9 (41): 24003-24014
被引量:19
摘要
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.
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