高疏水型纤维素纳米纤/聚乳酸杂化气凝胶用于高效油水分离

Highly Hydrophobic Cellulose Nanofiber/Polylactic Acid Hybrid Aerogel for Efficient Oil-Water Separation

针对油类产品对水的污染日益严重问题,文中利用Pickering乳液技术经过冷冻干燥制备出纤维素纳米纤维(CNF)/聚乳酸(PLA)复合气凝胶,再进一步通过化学气相沉积法将1H,1H,2H,2H-全氟癸基三乙氧基硅烷(PDTS)引入CNF/PLA复合气凝胶体系,成功制备出结构形貌规整、高孔隙率的高疏水型杂化气凝胶(M-CNF/PLA)。研究了水相pH值、改性剂(PDTS)用量及油相中聚乳酸(PLA)含量对所得杂化气凝胶的形貌结构和疏水性能的影响。结果表明,当水相pH值为4、PDTS的用量为50μL时、油相中PLA的质量分数为4%,所得的M-CNF/PLA杂化气凝胶的孔隙结构规整且具有优异的疏水性能,与水的接触角可达146.7°,并能快速吸附水上油和水下油,能对油水进行高效分离。

With the rapid development of petroleum industries,the water resource is increasingly polluted by kinds of oil products.Here,combining with freeze drying process,Pickering emulsion technology was used to prepare a nanocellulose fiber(CNF)/polylactic acid(PLA)composite aerogel,and then by virtue of chemical vapor deposition method,1H,1H,2H,2H-perfluorodecyltriethoxysilane(PFDTS)was introduced into it,thus leading to the formation of the highly hydrophobic hybrids aerogel(M-CNF/PLA)with high porosity(>96%)and regular morphology.The effects of the pH value of the water phase,and the dosages of PFDTS and PLA on the morphology,structure and hydrophobicity of the hybrids aerogel obtained were carefully investigated.The results show that the M CNF/PLA hybrid aerogels with regularly porous structure exhibit excellent hydrophobicity with a water contact angle of 146.7°when the value pH of water is 4,the dosage of PFDTS is 50μL and the mass fraction of PLA in oil phase is 4%.Meanwhile,the hybrids aerogel can quickly and efficiently absorb kinds of oil whether floating on the surface or settling in the bottom of water,showing an excellent property for oil-water separation.