Dai Jiangdong, Wang Lulu, Wang Yi, Tian Sujun, Tian Xiaohua, Xie Atian, Zhang Ruilong, Yan Yongsheng, Pan Jianming
Institute of Green Chemistry and Chemical Technology, School of Chemistry and Chemical Engineering , Jiangsu University , Zhenjiang 212013 , China.
State Key Laboratory of NBC Protection for Civilian , Beijing 102205 , China.
ACS Appl Mater Interfaces. 2020 Jan 29;12(4):4482-4493. doi: 10.1021/acsami.9b18664. Epub 2020 Jan 13.
Inspired by the mastoid structure of the lotus leaf and the robust layered structure of the nacre, a novel nacrelike graphene oxide-calcium carbonate (GO-CaCO) hybrid mesh with superhydrophilic and underwater superoleophobic property was prepared for the first time, via a facile, economical, and environmentally friendly layer-by-layer (LBL) self-assembly method using commercially available stainless steel mesh (SSM) as a ready-made mask. Interestingly, GO nanosheets played a threefold role, regulating the growth of CaCO nanocrystals between the GO interlamination for constructing a "brick-and-mortar" structure, improving the interface stability via coordination assembly onto SSM, and creating strong hydration derived from rich oxygen-containing functional groups. The surface hydrophilicity and hierarchically micro/nanoscale structure of GO-CaCO artificial pearls imbed on the SSM, contributing to outstanding superhydrophilicity and underwater superoleophobicity. The biomimetic hybrid mesh exhibited a strong mechanical property with a Young's modulus of 25.4 ± 2.6 GPa. The optimized hybrid mesh showed a high separation efficiency of more than 99% toward a series of oil/water mixtures with high flux. The low oil-adhesion force, high fatigue-resistance, chemical stability (acid/alkali/salt resistance), and excellent recycling performance enlighten the great prospects of GO-based nacrelike material for application in oily wastewater treatment.
受荷叶乳突结构和珍珠层坚固分层结构的启发，首次通过一种简便、经济且环保的层层（LBL）自组装方法，以市售不锈钢网（SSM）作为现成的模板，制备了一种具有超亲水性和水下超疏油性的新型类珍珠质氧化石墨烯 - 碳酸钙（GO - CaCO₃）混合网。有趣的是，氧化石墨烯纳米片发挥了三重作用，调节碳酸钙纳米晶体在氧化石墨烯层间的生长以构建“砖石”结构，通过配位组装到不锈钢网上提高界面稳定性，并通过丰富的含氧官能团产生强水合作用。嵌入在不锈钢网上的GO - CaCO₃人工珍珠的表面亲水性和分级微/纳米尺度结构，有助于实现出色的超亲水性和水下超疏油性。这种仿生混合网表现出强大的机械性能，杨氏模量为25.4±2.6 GPa。优化后的混合网对一系列油/水混合物具有超过99%的高分离效率和高通量。低油附着力、高抗疲劳性、化学稳定性（耐酸/碱/盐）以及出色的循环性能，为基于氧化石墨烯的类珍珠质材料在含油废水处理中的应用展现了广阔前景。
