Construction of dual-functional membrane with novel structured β-cyclodextrin hybridization for simultaneous oily wastewater separation and hazardous aromatics removal. (June 2022)

• Record Type: Journal Article
• Authors: Guan, Chengdong; Xu, Fang; Li, Yanlin; Zhu, Lijun; Xia, Daohong
• Is Part Of: Journal of water process engineering. Volume 47(2022)
• Publication Date: 2022-06
• Subjects: β-Cyclodextrin derivative -- Superhydrophilic -- Dual-functional membranes -- Oil-in-water separation; Water-supply engineering -- Periodicals; Saline water conversion -- Periodicals; Seawater -- Distillation -- Periodicals; Sanitary engineering -- Periodicals; Sewage -- Purification -- Periodicals; 627
• DOI: 10.1016/j.jwpe.2022.102756
• Languages: English
• ISSNs: 2214-7144

Abstract

Abstract: During the separation of water-insoluble oil droplets in the oily wastewater by the membrane treatment process, the simultaneous removal of organic pollutants dissolved in the aqueous phase remains a challenge. Herein, we demonstrate an effective strategy for preparing dual-functional membranes with hybridization of novel β-cyclodextrin (β-CD) derivatives to achieve complete cleansing of oily sewage. Alkylenedioxy bridged bis(p-difluoro-p-dicyano) phenyl substituted β-CDs (R3 -2T-2β-CD and R6 -2T-2β-CD) are first synthesized and incorporated into three frequently used membranes (polyethersulfone (PES), poly( p -phenylene terephthalamide) (PPTA) and poly( m -phenylene isophthalamide) (PMIA)) casting solutions to fabricate hybrid membranes, respectively. The hydrophilicity of the prepared membrane can be improved greatly for the separation of oil-in-water emulsions. The PMIA/R3 -2T-2β-CD membrane exhibited pure water permeances over 760.50 L·m −2 ·h −1 ·bar −1 with separation efficiency of the tween 80 stabilized diesel-in-water emulsion above 98.62% under cross-flow filtration. Significantly, the hybrid membranes could concurrently remove naphthalene and methylene blue dissolved in water during oil-in-water separation. This study proves the application potential of cyclodextrins in designing membrane materials and these one-step hybrid membranes can thoroughly decontaminate oil-in-water emulsions by eliminating the dissolved polycyclic aromatic molecules. Graphical abstract: Unlabelled Image Highlights: Composite membrane was obtained by hybridization of novel structured β-cyclodextrin. Existence of hydroxyl groups on β-cyclodextrin made membrane superhydrophilic. Durable and efficient separation of surfactant stabilized oil-in-water emulsion. Concurrently removal of water-soluble hazardous polycyclic aromatic compounds.