One-step preparation of a superhydrophilic membrane with excellent anti-oil fouling property for simultaneous separation of emulsified oils and dyes in complex wastewater

Jun Zhang, Dawei Luo, Lihao Yao, Jiaxin Guo, Jinhao Zhang,Cuiyin Liu,Jingjing Li,Xinjuan Zeng,Min Zhang,Shaozao Tan

JOURNAL OF MATERIALS SCIENCE(2023)

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Abstract
As reported herein, an environmentally friendly superhydrophilic membrane with underwater superoleophobicity was prepared for the efficient separation of oil-in-water emulsions and dyes. The preparation of this superhydrophilic membrane is very simple, requiring only a one-step modification of polyvinylidene fluoride (PVDF) membranes by ionic chelation of phytic acid (PA) and polydopamine (PDA) in an aqueous solution (PA@PDA/PVDF). The PA@PDA/PVDF membrane shows superhydrophilicity in air with pure water permeance reaching up to 98354 ± 1574 L m −2 h −1 bar −1 and underwater oil contact angles (UWOCAs) greater than 150°. The high water permeance and excellent underwater superoleophobicity of the PA@PDA/PVDF membrane give it excellent oil–water separation performance, thus enabling it to separate various oil-in-water emulsions with high efficiency above 95.2% and permeance up to 48855.3 ± 3752 L m −2 h −1 bar −1 . Moreover, the PA@PDA/PVDF membrane shows remarkable recoverability and excellent anti-oil fouling property during the separation of emulsified oily wastewater. The remaining catechol groups of PDA and the phosphate groups of PA endow the PA@PDA/PVDF membrane with significant electronegativity, so that it can be used to efficiently separate dye wastewater by filtration through electrostatic adsorption. More importantly, the PA@PDA/PVDF membrane can simultaneously remove organic contaminants from complex wastewaters containing emulsified oils and dyes in just one filtration process, with a total efficiency above 92%. Thanks to its simple and environmentally friendly preparation method and excellent separation performance, the PA@PDA/PVDF membrane shows great potential for the practical treatment of complex wastewaters containing a wide range of organic pollutants. Graphical abstract
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Key words
superhydrophilic membrane,emulsified oils,complex wastewater,one-step,anti-oil
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