Construction of gradient SA-TiO2 hydrogel coated PVDF-g-IL fibre membranes with high hydrophilicity and self-cleaning for the efficient separation of oil-water emulsion and dye wastewater

IF 8.4 1区 工程技术 Q1 ENGINEERING, CHEMICAL
Hongxu Liu , Junhao Xie , Jingxuan Zhao , Ruijia Wang , Yuchao Qi , Ziwei Lv , Yang Yu , Shulin Sun
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引用次数: 0

Abstract

The industrial wastewater filtered by water treatment membranes is very complex in practical applications, therefore, it is a challenge to prepare a membrane with large pore size and high flux that can efficiently separate various wastewater containing pollutants of different scales. To solve this problem, an SA-TiO2 hydrogel-coated PVDF-g-IL composite fibre membrane with super hydrophilicity, anti-pollution, and pH-responsive self-cleaning properties has been designed and prepared by electrostatic spinning and layer-by-layer coating techniques in the present work. The super hydrophilic gel layer on the surface gives the composite membrane efficient separation capability while maintaining rapid passage of the aqueous phase; the underlying PVDF-g-IL fibre membrane is positively charged and removes not only anionic/cationic pollutants by electrostatic repulsion or attraction but also creates an ionic bond with oppositely assigned SA so that the gel layer tightly bond to the base membrane. The PVDF-g-IL@SA-TiO2 membrane achieves stable and efficient separation of oil-water emulsions and dye wastewaters with a high filtration flux while retaining a retention rate higher than ∼95%. After multiple self-cleaning cycles, the ultra-thin gel layer still offers satisfactory durability with ≈100% flux recovery. This study provides a promising new strategy for designing efficient multiple contaminant separation and simpler self-cleaning membranes.

Abstract Image

构建具有高亲水性和自清洁功能的梯度 SA-TiO2 水凝胶涂层 PVDF-g-IL 纤维膜,用于高效分离油水乳液和染料废水
在实际应用中,水处理膜过滤的工业废水非常复杂,因此,如何制备一种大孔径、高通量的膜,以高效分离含有不同规模污染物的各种废水,是一项挑战。为了解决这个问题,本研究采用静电纺丝和逐层涂层技术设计并制备了一种具有超亲水性、抗污染和 pH 响应自清洁特性的 SA-TiO2 水凝胶涂层 PVDF-g-IL 复合纤维膜。表面的超亲水凝胶层赋予了复合膜高效的分离能力,同时保持了水相的快速通过;底层的 PVDF-g-IL 纤维膜带正电荷,不仅能通过静电排斥或吸引去除阴离子/阳离子污染物,还能与异性分配的 SA 形成离子键,使凝胶层与基膜紧密结合。PVDF-g-IL@SA-TiO2 膜以高过滤通量实现了油水乳化液和染料废水的稳定高效分离,同时保留率高于 ∼95%。经过多次自清洁循环后,超薄凝胶体层仍具有令人满意的耐久性,通量回收率≈100%。这项研究为设计高效的多污染物分离和更简单的自清洁膜提供了一种前景广阔的新策略。
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来源期刊
Journal of Membrane Science
Journal of Membrane Science 工程技术-高分子科学
CiteScore
17.10
自引率
17.90%
发文量
1031
审稿时长
2.5 months
期刊介绍: The Journal of Membrane Science is a publication that focuses on membrane systems and is aimed at academic and industrial chemists, chemical engineers, materials scientists, and membranologists. It publishes original research and reviews on various aspects of membrane transport, membrane formation/structure, fouling, module/process design, and processes/applications. The journal primarily focuses on the structure, function, and performance of non-biological membranes but also includes papers that relate to biological membranes. The Journal of Membrane Science publishes Full Text Papers, State-of-the-Art Reviews, Letters to the Editor, and Perspectives.
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