Green Preparation of a Carboxymethyl Cellulose-Coated Membrane for Highly Efficient Separation of Crude Oil-In-Water Emulsions
journal contributionposted on 2022-05-26, 20:13 authored by Qing Sun, Bin Xiang, Peng Mu, Jian Li
Developing high-performance membranes is an extremely significant strategy to combat increasing severe oil pollution. However, most of the previously reported superwettable membranes have been inevitably involved with the use of toxic solvents and complicated preparation processes. In addition, most of them lacked the capacity of separating crude oil-in-water emulsions. Herein, a facile and green strategy is employed to fabricate a polytetrafluoroethylene (PTFE) membrane with a mixed suspension of PDA@ZIF-8 and carboxymethyl cellulose (CMC) using water as a solvent via the vacuum filtration method. Combining hydrophilic property with micro–nano-roughness, the CMC-PDA@ZIF-8-coated PTFE membrane (CPZP membrane) exhibits excellent underwater superoleophobicity. More importantly, the separation efficiency of various surfactant-stabilized oil-in-water emulsions including crude oil/water emulsion is higher than 99.2% with a flux up to 1306.5 L m–2 h–1, and the separation performance remains nearly the same after 10 cycles. Moreover, outstanding underwater superoleophobic and self-cleaning properties are maintained after long-distance sandpaper abrasion and multiple bending tests. Meanwhile, its exceptional separation performance is still maintained in harsh environments (3.5 wt % NaCl, 1 M HCl, 60 °C hot water) even after immersing it for 24 h. Therefore, this green-prepared and high-performance membrane has tremendous application prospects in treating oily wastewater.
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vacuum filtration methodtremendous application prospectstreating oily wastewateroutstanding underwater superoleophobicmultiple bending testsmicro – nanodistance sandpaper abrasioncombining hydrophilic propertyhighly efficient separationextremely significant strategycomplicated preparation processesexceptional separation performanceseparating crude oilcoated ptfe membranecrude oilseparation efficiencycoated membranestabilized oilperformance membranesperformance membranegreen strategygreen preparationwater emulsionswater emulsionvarious surfactantusing watertoxic solventssolvent viamixed suspensioninevitably involvedharsh environmentscpzp membranecleaning propertiescarboxymethyl cellulose5 wt5 l10 cycles