Zeng Xinjuan, Cai Weicheng, Fu Shuyi, Lin Xiaomei, Lu Qiaorou, Liao Shuang, Hu Huawen, Zhang Min, Zhou Cailong, Wen Xiufang, Tan Shaozao
Guangdong Key Laboratory for Hydrogen Energy Technologies, School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, PR China.
Guangdong Key Laboratory for Hydrogen Energy Technologies, School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, PR China.
J Hazard Mater. 2022 Feb 15;424(Pt B):127543. doi: 10.1016/j.jhazmat.2021.127543. Epub 2021 Oct 21.
A novel Janus sponge with the ability to remove complex contaminants from water is reported. Firstly, a superhydrophilic sponge (PA@PEI-sponge) is prepared via synthesizing negatively charged phytic acid@polyethyleneimine (PA@PEI) nanoparticles and assembling them on the surface of polydopamine (PDA) and PEI-modified polyurethane (PU) sponge through electrostatic adsorption. The Janus sponge is generated by modifying one side of the PA@PEI-sponge with PDMS, which exhibits superior separation efficiency and high filtration flux toward both water-in-oil and oil-in-water emulsions due to its multiplex selective wettability and the interconnected and tortuous 3D porous channels. The numerous negatively charged active sites of PA@PEI nanoparticles and PDA layer impart the superhydrophilic PA@PEI-sponge with the removal efficiency of 39.95 ± 0.27% for malachite green (MG) via simple flow-through filtration, which can be improved to 99.92 ± 0.07% by Janus modification. More importantly, the Janus sponge exhibits an excellent treatment capacity for complex mixtures containing emulsified oil and dye, with the separation efficiency above 99.59%. The Janus sponge also demonstrates the effective separation of real industrial wastewater collected from an acrylic dyeing plant. Together with a facile and green preparation strategy, this Janus sponge shows excellent application potential for simultaneous dye removal and oil/water emulsion separation.
报道了一种具有从水中去除复杂污染物能力的新型双面海绵。首先，通过合成带负电荷的植酸@聚乙烯亚胺（PA@PEI）纳米颗粒，并通过静电吸附将它们组装在聚多巴胺（PDA）和PEI改性的聚氨酯（PU）海绵表面上，制备出超亲水海绵（PA@PEI-海绵）。通过用PDMS对PA@PEI-海绵的一侧进行改性来生成双面海绵，由于其多重选择性润湿性以及相互连接且曲折的三维多孔通道，该双面海绵对油包水和水包油乳液均表现出优异的分离效率和高过滤通量。PA@PEI纳米颗粒和PDA层的大量带负电荷的活性位点赋予超亲水PA@PEI-海绵通过简单的流通过滤去除孔雀石绿（MG）的效率为39.95±0.27%，通过双面改性可提高到99.92±0.07%。更重要的是，双面海绵对含有乳化油和染料的复杂混合物表现出优异的处理能力，分离效率高于99.59%。双面海绵还证明了对从丙烯酸染色厂收集的实际工业废水的有效分离。连同简便且绿色的制备策略，这种双面海绵在同时去除染料和分离油/水乳液方面显示出优异的应用潜力。
