Chemosphere ( IF 8.1 ) Pub Date : 2023-06-15 , DOI: 10.1016/j.chemosphere.2023.139179
Qinglin Dai , Daohao Li , Yuanyuan Sun , Hu Wang , Yun Lu , Dongjiang Yang
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Aerogel has excellent application potential in adsorption, heat preservation, and other areas due to its typical advantages of low density and high porosity. However, there are several issues with the use of aerogel in oil/water separation, including weak mechanical qualities and challenges in eliminating organic contaminants at low temperature. Inspired by cellulose Iα, which has excellent performance at low temperature, this study used cellulose Iα nanofibers extracted from seaweed solid waste as the skeleton, through covalent cross-linked with ethylene imine polymer (PEI) and hydrophobic modification of 1, 4-phenyl diisocyanate (MDI), supplemented by freeze-drying technology to form three-dimensional sheet, and successfully obtained cellulose aerogels derived from seaweed solid waste (SWCA). The compression test shows that the maximum compressive stress of SWCA is 61 kPa, and the initial performance still maintains 82% after 40 cryogenic compression cycles. In addition, the contact angles of water and oil on the surface of the SWCA were 153° and 0°, respectively, and the stable hydrophobic time in simulated seawater is more than 3 h. By combining the elasticity and superhydrophobicity/superoleophilicity, the SWCA with an oil absorption capacity of up to 11–30 times its mass, might be utilized repeatedly for the separation of an oil/water mixture.
中文翻译:
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来自海藻固体废物的耐低温超疏水弹性纤维素气凝胶可作为油/水分离的有效捕油器
气凝胶因其低密度、高孔隙率的典型优点,在吸附、保温等领域具有良好的应用潜力。然而,使用气凝胶进行油/水分离存在一些问题,包括机械性能差以及在低温下消除有机污染物方面的挑战。受低温性能优异的纤维素Iα的启发,本研究以从海藻固废中提取的纤维素Iα纳米纤维为骨架,通过与乙烯亚胺聚合物(PEI)共价交联并对1, 4-苯基二异氰酸酯进行疏水改性(MDI),辅以冷冻干燥技术形成三维片材,成功获得海藻固废纤维素气凝胶(SWCA)。压缩试验表明,SWCA的最大压应力为61 kPa,经过40次低温压缩循环后初始性能仍保持82%。此外,SWCA表面水和油的接触角分别为153°和0°,在模拟海水中的稳定疏水时间大于3 h。通过结合弹性和超疏水性/超亲油性,SWCA 的吸油能力高达其质量的 11-30 倍,可重复用于油/水混合物的分离。