Zhong Lingqi, Tao Haizheng, Gong Xiao
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, P. R. China.
Langmuir. 2021 Jun 8;37(22):6765-6775. doi: 10.1021/acs.langmuir.1c00858. Epub 2021 May 24.
In this work, superhydrophobic poly(l-lactic acid) (PLLA) hierarchical membranes exhibiting excellent oil-removal performance, which is of great importance in curbing the oil-pollution environment, were fabricated by a simple solvent-evaporation-induced precipitation method. PLLA membranes with hierarchical micro/nanostructures (fish scales, fibrous sheets, and petal-like morphology) can be conveniently prepared by adjusting the preparation parameters including PLLA concentration, precipitation temperature, type of solvent and nonsolvent, and the addition of nano-SiO. The results show that the water contact angle of the fish-scale-structured PLLA membrane was 138.6°, revealing that water repellency was significantly improved compared to that of the solvent-casting PLLA membrane (∼72.8°). Moreover, the PLLA/SiO nanocomposite membrane with a dense hierarchical micro/nanostructure had a water contact angle greater than 167.1°, which has great potential in oil-water separation.
在本工作中，通过一种简单的溶剂蒸发诱导沉淀法制备了具有优异除油性能的超疏水聚（L-乳酸）（PLLA）分级膜，这对于抑制油污染环境具有重要意义。通过调节包括PLLA浓度、沉淀温度、溶剂和非溶剂类型以及纳米SiO添加量等制备参数，可以方便地制备出具有分级微/纳米结构（鱼鳞状、纤维片状和花瓣状形态）的PLLA膜。结果表明，鱼鳞结构的PLLA膜的水接触角为138.6°，这表明与溶剂浇铸的PLLA膜（约72.8°）相比，其疏水性得到了显著提高。此外，具有致密分级微/纳米结构的PLLA/SiO纳米复合膜的水接触角大于167.1°，在油水分离方面具有巨大潜力。
