A Low-Cost Biomimetic Heterostructured Multilayer Membrane with Geopolymer Microparticles for Broad-Spectrum Water Purification
A Low-Cost Biomimetic Heterostructured Multilayer Membrane with Geopolymer Microparticles for Broad-Spectrum Water Purification
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一种具有地质聚合物微粒的低成本仿生异质结构多层膜，用于广谱水净化。
DOI：
10.1021/acsami.0c00440
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发表时间：
2020-03-11
影响因子：
9.5
通讯作者：
Cui, Xuemin
中科院分区：
文献类型：
--
作者：
Song, Ying;Li, Zhili;Cui, Xuemin
膜在水净化领域受到广泛关注。然而，开发具有所需结构的低成本、环保的广谱水净化膜仍然是一个巨大的挑战。受木材的层次结构和功能的启发，本研究报道了通过简便且“绿色”的逐层自组装方法制造的异质结构多层膜。具体来说，将亲水性地质聚合物微粒掺杂到海藻酸钠基质中构建具有众多微通道的“木质部”层，并使用壳聚糖构建具有致密结构的“韧皮部”层。由此产生的仿生多层膜显示出独特的异质结构，并对不同种类的污染物（包括纳米颗粒、可溶性染料和重金属离子以及乳化油滴）提供所需的截留率。此外，仿生膜在长期运行中表现出优异的稳定性，并且在多次去除油滴方面表现出优异的可回收性。所提出的以完全“绿色”方式制备的仿生膜在水净化和分离的实际应用中具有巨大的潜力。
Membranes have received wide interests in water purification. However, the development of low-cost and eco-friendly membrane with desired structure for broad-spectrum water purification still remains a great challenge. Inspired by the hierarchical structure and functions of wood, a heterostructured multilayer membrane fabricated through a facile and "green" layer-by-layer self-assembly method was reported in this study. Specifically, the hydrophilic geopolymer microparticles were doped into sodium alginate matrix to construct "xylem" layers with numerous microchannels, and chitosan was used to build "phloem" layers with dense structures. The resultant biomimetic multilayer membrane displayed a distinct heterostructure and provided desired rejection to different kinds of pollutants including nanoparticles, soluble dyes and heavy metal ions, as well as emulsified oil droplets. Furthermore, the biomimetic membrane exhibited a superior stability in a long-term operation, and an excellent recyclability for multiple usages for oil droplets removal. The proposed biomimetic membrane prepared in a completely "green" way possesses great potential in practical application for water purification and separation.