Mussel-inspired superhydrophilic membrane constructed on a hydrophilic polymer network for highly efficient oil/water separation
Mussel-inspired superhydrophilic membrane constructed on a hydrophilic polymer network for highly efficient oil/water separation
复制标题
受贻贝启发的超亲水膜构建在亲水聚合物网络上，用于高效油/水分离
DOI：
10.1016/j.jcis.2021.09.123
复制
发表时间：
2021-10-08
影响因子：
9.9
通讯作者：
Zeng, Hongbo
中科院分区：
文献类型：
--
作者：
Xu, Zhongzheng;Li, Lin;Zeng, Hongbo
假设：由亲水聚合物构建的超亲水/水下超疏油膜由于其固有的拒油特性，在含油废水的分离中具有很大的优势。水化层的形成排斥和阻隔油被认为是水下超疏油和后续油水分离的机理。在基体表面构建稳定的亲水性聚合物网络，可以显著提高水化层的鲁棒性。实验：本研究开发了一种可行且通用的贻贝启发浸涂方法，通过将底物膜依次浸入聚多巴胺（PDA）和儿茶酚功能化亲水聚合物（CFHP）的水溶液中，在目标底物表面构建稳定的亲水聚合物网络。经水预润湿后，聚合物网络会随水膨胀，形成一层薄而稳定的水膜层，起到防止石油渗透的屏障作用。结果：制备的CFHP/PDA改性膜在分离各种油水混合物和表面活性剂稳定的水包油乳状液方面表现出优异的性能，分离通量高达5641.1 L.m(-2).h(-1)，分离效率达到99.98%。本研究开发的表面改性方法可以很容易地扩展到各种材料和膜系统，以实现各种实际应用，如工业废水处理。(C) 2021爱思唯尔公司版权所有。
Hypothesis: Superhydrophilic/underwater superoleophobic membrane constructed by hydrophilic polymers possesses great advantage in the separation of oily waste water, due to its intrinsic oil-repellent property. The formation of hydration layer to repel and block oil is considered as the mechanism of underwater superoleophobicity and subsequent oil/water separation. Constructing a stable hydrophilic polymer network on the substrate surface would significantly improve the robustness of hydration layer.Experiments: In this work, a feasible and universal mussel-inspired dip-coating method was developed for constructing stable hydrophilic polymer network onto target substrate surface, via successively immersing substrate membranes into aqueous solutions of polydopamine (PDA) and catechol-functionalized hydrophilic polymer (CFHP). After pre-wetting with water, the polymer network would swell with water to form a thin and stable water film layer, serving as a barrier against oil penetration.Findings: The as-prepared CFHP/PDA modified membranes exhibit outstanding performance in separating various oil/water mixtures and oil-in-water emulsions stabilized by surfactants, with separation flux up to 5641.1 L.m(-2).h(-1) and separation efficiency achieving 99.98%. The surface modification method developed in this work can be easily extended to various materials and membrane systems, for achieving a variety of practical applications such as industrial wastewater treatment. (C) 2021 Elsevier Inc. All rights reserved.