Stainless-steel-net-supported superhydrophobic COF coating for oil/water separation
Stainless-steel-net-supported superhydrophobic COF coating for oil/water separation
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不锈钢网支撑的超疏水COF涂层用于油/水分离
DOI：
10.1016/j.memsci.2019.117177
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发表时间：
2019-10-01
影响因子：
9.5
通讯作者：
Huang, Aisheng
中科院分区：
文献类型：
--
作者：
Jiang, Yunzhe;Liu, Chuanyao;Huang, Aisheng
本文报道了一种新型的超疏水COF涂层的制备方法，并利用全氟辛基三乙氧基硅烷（POTS）对其进行改性。通过合成后改性，在不改变晶体形貌和结构的情况下，使BTADHBD的水接触角（CA）从83.7 °增加到153.2 °。通过重复生长在不锈钢网（SSN）上制备BTADHBD COF涂层，然后使用（+/-）-缩水甘油（Glc）和POTS进行合成后改性，以获得具有152.1度的水CA的SSN负载的超疏水BTADHBD@Glc@POTS涂层。该超疏水BTADHBD@Glc@POTS涂层具有良好的耐水性、自清洁性和以重力为驱动力的油水分离性能。对于不同的油水混合物，当油通量大于70 L/（m2·s）时，油水分离效率均达到99.5%以上。在连续50次油水分离循环中，高的油水分离效率（99.5%以上）保持不变，这对于油水分离是非常有希望的。
This work reports the preparation and post-synthetic modification of COF named BTADHBD with perfluorooctyltriethoxysilane (POTS) to obtain a superhydrophobic COF coating. Through post-synthetic modification, the water contact angle (CA) of BTADHBD is increased from 83.7 degrees to 153.2 degrees without change of crystals morphology and structure. BTADHBD COF coating was prepared on the stainless steel net (SSN) through repeated growth, followed by post-synthetic modification using (+/-)-glycidol (Glc) and POTS to obtain the SSN-supported superhydrophobic BTADHBD@Glc@POTS coating with a water CA of 152.1 degrees. The superhydrophobic BTADHBD@Glc@POTS coating showed high water-resistance, self-cleaning property and oil/water separation performance using simply gravity as driving force. For various oil/water mixtures, the oil/water separation efficiency was always up to 99.5% with oil flux above 70 L/(m(2).s). For 50 successive cycles of oil/water separation, the high oil/water separation efficiency (above 99.5%) remained unchanged, which is very promising for oil/water separation.