Phase inversion/sintering-induced porous ceramic microsheet membranes for high-quality separation of oily wastewater

In this study, low-cost ceramic microsheet membranes with a thickness of sub-0.5 mm that possess superhydrophilic and underwater superoleophobic properties were fabricated from an Al2O3-rich Al2O3/polysulfone composite slurry via a phase inversion/sintering strategy. The cross-sectional morphologies of these phase inversion-induced composite films appear as ceramic green bodies that can be precisely controlled by tuning the operation parameters during the classic phase-inversion process of a polymer, which allows the morphology to withstand a subsequent sintering process that can reach temperatures as high as 1,250 °C. The thinner nature (99% and a much higher emulsion permeability of ∼3,000 L/(m2 h bar), which is 2 orders of magnitude higher than most commercially available microfiltration membranes that are capable of similar levels of separation performance. This process resulted in a favorable membrane that combines robustness under complex chemical environments with low cost for both materials and processing approaches, which should facilitate its practical application in the industrial treatment of oily wastewater.Graphical abstract
Source: Journal of Membrane Science - Category: Materials Science Source Type: research

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