Bio-inspired antifouling Cellulose nanofiber multifunctional filtration membrane for highly efficient emulsion separatio
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pISSN: 0256-1115 eISSN: 1975-7220
INVITED REVIEW PAPER
INVITED REVIEW PAPER
Bio-inspired antifouling Cellulose nanofiber multifunctional filtration membrane for highly efficient emulsion separation and application in water purification Xiangying Yin*,**, Yi He*,**,†, Yuqi Wang*,**, Hao Yu*,**, Jingyu Chen***,†, and Yixuan Gao*,** *State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, P. R. China **College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, P. R. China ***Deakin University, Institute for Frontier Materials, VIC 3220, Australia (Received 19 June 2019 • Revised 25 March 2020 • Accepted 5 May 2020) AbstractMembrane fouling is usually a troublesome issue in oily water treatment, especially containing complex crude oil emulsions. Although most of the reported membranes are in a position to repel models oils, it’s still a big challenge of repelling crude oil. Besides, the fabrication processes of those membranes are too complicated, high-cost and environmentally unfriendly. Hence, in this work, a facile and green method was designed to fabricate a Cellulose nanofiber (CNF) polyelectrolyte filtration membrane with excellent underwater superoleophobic characteristic and outstanding antifouling performance. The membrane not only can separate oil/water emulsions with a high separation efficiency (>99%) and water flux (>11,000 L m 2 h1), but also remove positively charged dyes with good permeation fluxes (>10,000 L m 2 h 1) and rejection radio (>98%). Herein, it can be anticipated that this method has excellent potential for designing and preparing the specific membranes for multifunctional applications in water treatment. Keywords: Cellulose Nanofiber, Membrane, Emulsion Separation, Antifouling
of emulsion treatment [16-18]. Thus, further large-scale practical applications of filtration membranes are restricted. In fact, surface hydrated layer, which protects the surface from contacting, endows the filtration membrane with antifouling performance [19-21]. The stronger the extent of hydration, the superior is the antifouling function [22,23]. Polyelectrolyte is a representative material that usually has strong hydration ability [24]. Due to abundant hydrophilic groups on polyelectrolytes, such as hydroxy, carboxyl, amino, polyionized group, on polyelectrolytes can develop a powerful hydration film in water [25,26]. Recently, according to Brown and Bhushan [27], a robust antifouling superoleophobic/ superhydrophilic coating could be formed with the polyelectrolytefluorosurfactant complex by layer-by-layer method. Besides, a superhydrophilic/underwater superoleophobic polyacrylonitrile with alkaline condition was reported by Zhang et al. [28], and the composite separation membrane showed an ultralow oil-adhesion behavior. Furthermore, He et al. [29] covered polyelectrolyte coating onto the steel mesh with the method of surface-initiated atom transfer radical polymerization (SI-ATRP). After
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