College of Ecological Environment and Urban Construction, Fujian University of Technology, Fuzhou 350118, China; Institute of Chemical Safety, Fujian University of Technology, Fuzhou 350118, China.
College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
Carbohydr Polym. 2019 Dec 15;226:115279. doi: 10.1016/j.carbpol.2019.115279. Epub 2019 Sep 5.
Hydrogels with low-adhesive superoleophobicity are ideal candidates for modifying filtration substrates to achieve efficient and antifouling oil/water separation. However, there are still some unfavorable factors hindering their practical application, including expensive raw materials, complex fabrication process, poor stability and durability. In this work, a durable, cost-effective and superhydrophilic chitosan-alginate (CS-ALG) hydrogel coated mesh was developed by a facile, two-step dip-coating method for efficient oil/water separation in hypersaline environments. By integrating polysaccharide-based superhydrophobic surfaces and the hierarchical micro-/nanostructures, the as-fabricated CS-ALG hydrogel coated mesh exhibits excellent underwater superoleophobicity and anti-oil-fouling performance. Benefiting from that, the mesh could separate various oil/water mixtures with high separation efficiency (> 99%). It is worth mentioning that the double-cross-linked CS-ALG hydrogel based on sequential electrostatic interaction and ionic cross-linking shows excellent durability in hypersaline environments. All these attractive advantages make the hydrogel-coated mesh a promising candidate for oily wastewater treatment and oil spill cleanup.
具有低粘附超疏油性的水凝胶是修饰过滤基底以实现高效和防污油水分离的理想选择。然而，仍然存在一些不利因素阻碍了它们的实际应用，包括昂贵的原材料、复杂的制造工艺、较差的稳定性和耐久性。在这项工作中，通过简便的两步浸涂法开发了一种耐用、经济高效且超亲水的壳聚糖-海藻酸钠（CS-ALG）水凝胶涂层网，用于在高盐环境中进行高效的油水分离。通过集成多糖基超疏水表面和分级微/纳米结构，所制备的 CS-ALG 水凝胶涂层网表现出优异的水下超疏油性和抗油污性能。受益于此，该网可以高效分离各种油/水混合物（>99%）。值得一提的是，基于顺序静电相互作用和离子交联的双交联 CS-ALG 水凝胶在高盐环境中表现出优异的耐久性。所有这些吸引人的优点使水凝胶涂层网成为处理含油废水和清理溢油的有前途的候选材料。
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