Optimization and characterization of magnetite-reduced graphene oxide nanocomposites for demulsification of crude oil in water emulsion
| Autor: | Mun Mun Wai, Nilar Lwin, Rajalingam Sokkalingam, Cheng Seong Khe, Xin Hui Yau, Khairulazhar Jumbri, Wei-Wen Liu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Nanocomposite
Materials science Graphene General Chemical Engineering Residual oil Oxide 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Demulsifier 01 natural sciences 0104 chemical sciences law.invention chemistry.chemical_compound Chemical engineering chemistry law Emulsion Fourier transform infrared spectroscopy 0210 nano-technology Magnetite |
| Zdroj: | RSC advances. 9(41) |
| ISSN: | 2046-2069 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|