School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, PR China.
School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, PR China.
Int J Biol Macromol. 2023 Jul 31;244:125399. doi: 10.1016/j.ijbiomac.2023.125399. Epub 2023 Jun 16.
Lipophilic adsorbents for oil-water separation are usually synthesized using the template method, in which hydrophobic materials are coated on a ready-made sponge. Herein, a novel solvent-template technique is used to directly synthesize a hydrophobic sponge, by crosslinking polydimethylsiloxane (PDMS) with ethyl cellulose (EC) which plays a vital role in the formation of 3D porous structure. The as-prepared sponge has advantages of strong hydrophobility, high elasticity, as well as excellent adsorption performance. In addition, the sponge can be readily decorated by nano-coatings. After the sponge was simply dipped in nanosilica, the water contact angle increases from 139.2° to 144.5°, and the maximum adsorption capacity for chiroform rises from 25.6 g/g to 35.4 g/g. The adsorption equilibrium can be reached within 3 min, and, the sponge can be regenerated by squeezing, without any change in hydrophobility or evident decline in capacity. The simulation tests of emulsion separation and oil-spill cleanup demonstrate that the sponge has great potential in oil-water separation.
用于油水分离的亲油吸附剂通常使用模板法合成，其中疏水材料涂覆在现成的海绵上。在此，采用一种新的溶剂-模板技术，通过交联聚二甲基硅氧烷（PDMS）与乙基纤维素（EC）直接合成疏水海绵，EC 在形成 3D 多孔结构中起着至关重要的作用。所制备的海绵具有强疏水性、高弹性和优异的吸附性能。此外，该海绵可以很容易地进行纳米涂层修饰。海绵简单地浸入纳米二氧化硅后，水接触角从 139.2°增加到 144.5°，对氯仿的最大吸附容量从 25.6 g/g 增加到 35.4 g/g。吸附平衡可在 3 分钟内达到，并且通过挤压可以对海绵进行再生，而疏水性或容量没有明显下降。乳液分离和溢油清理的模拟测试表明，该海绵在油水分离方面具有很大的潜力。
