Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 18, Pages 25883-25894Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.05.319
Keywords
Superoleophobic; Perfluorooctanoate; Sol-gel; Stark membrane hollow fibre; Dip-coating; Oil-water separation
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Funding
- Ministry Higher of Education Malaysia [RJ130000.7809.4L867]
- Higher Institution Centre of Excellence Scheme [R.J090301.7809.4J430]
- Universiti Teknologi Malaysia under the Transdisciplinary Research University (TDR) [Q.J130000.3509.05G75]
- Industry and International Incentive Grant [QJ130000.3009.02M25]
- Tertiary Education Trust Fund (TETFund), Nigeria
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The study fabricated a superoleophobic membrane surface using the sol-gel technique, effectively addressing the challenges in oily wastewater treatment. By examining the effects of coating cycles on surface structure and chemical properties, the research achieved efficient oil-water separation results.
Oily wastewater treatment is a global challenge due to the substantial amount of effluent resulted from many industrial and domestic activities. To overcome the challenge of using existing treatment approach and fouling, superoleophobic coatings were fabricated. In this study, a superoleophobic membrane surface was obtained using the sol-gel technique with perfluorooctanoate (PFO), poly (diallyl dimethylammonium chloride) (PDADMAC), and nanoparticles as complex-polymer nanocomposites. The effects of coating cycles on the surface structure, chemical properties, surface chemistry, and oleophobicity of the surface were examined using field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and oil contact angle measurement. The results showed that the coated layer successfully adhered to the substrate surface. However, the chemical stability with respect to oil contact angle (OCA) revealed a decline at pH 7 and pH 9 and maintained stability at pH 3. Besides, oil flux at 63.0 L/m(2). h was achieved for PDADMAC-Al2O3/44 wt% PFO and the highest separation efficiency of 98% was obtained. Furthermore, the oil rejection decreases as the oil concentration increases from 1 to 3 g/L. OCA of 155 degrees was obtained after 5 coating cycles. Apart from mitigating substrate fouling, the superoleophobic and superhydrophilic coating can be applied to a ceramic-based hollow fibre membrane and efficiently used for the separation of oil from oily wastewater.
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