Chen Yongsheng, Xue Yi, Ma Sijia, Shi Haochuan, Wang Yanru, Ren Hongqiang, Xu Ke
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China.
Chemosphere. 2024 Dec;369:143879. doi: 10.1016/j.chemosphere.2024.143879. Epub 2024 Dec 5.
Recent advancements in functional sponge materials have garnered significant interest due to their efficacy and cost-effectiveness in oil spill remediation. This study introduces both silane coupling agent (methyltrichlorosilane and 3-aminopropyltriethoxysilane) and nano-SiO₂ particles into the melamine sponge framework via impregnation. Additionally, polydimethylsiloxane (PDMS) serves a crucial role in curing to fuse the substrate with the coating through robust covalent bonds. The modified sponges (SiMAPs) facilitate the formation of rough surfaces comprising hierarchical structures by the deposition of nano-SiO₂ particles, while the silane coupling agents and PDMS contribute to a reduced surface energy. These SiMAP sponges maintain high stability with a water contact angle of 162.6° and demonstrate an adsorption capacity ranging from 40 to 90 times their weight in oil or organic solvents. Furthermore, they achieve a separation efficiency exceeding 98% and an oil flux of 14.38 L/m∙s in immiscible oil-water mixtures. Additionally, the sorption of trichloromethane reaches 88.1 g/g, and the separation efficiency for surfactant-stabilized emulsions containing diesel is 62.8%. Remarkably, the oil-water separation efficiency surpasses 99.8% in dynamic continuous oil-water separation cycles, as evidenced by 20 experimental trials. These results underscore the substantial potential of SiMAP-modified sponges for addressing oil pollution by enhancing oil-water separation.
功能性海绵材料的最新进展因其在溢油修复中的有效性和成本效益而备受关注。本研究通过浸渍法将硅烷偶联剂（甲基三氯硅烷和3-氨丙基三乙氧基硅烷）和纳米二氧化硅颗粒引入三聚氰胺海绵骨架中。此外，聚二甲基硅氧烷（PDMS）在固化过程中起着关键作用，通过强大的共价键将基材与涂层融合在一起。改性海绵（SiMAPs）通过纳米二氧化硅颗粒的沉积促进了包含分级结构的粗糙表面的形成，而硅烷偶联剂和PDMS则有助于降低表面能。这些SiMAP海绵保持高稳定性，水接触角为162.6°，在油或有机溶剂中的吸附容量为其重量的40至90倍。此外，它们在不混溶的油水混合物中的分离效率超过98%，油通量为14.38 L/m∙s。此外，三氯甲烷的吸附量达到88.1 g/g，含柴油的表面活性剂稳定乳液的分离效率为62.8%。值得注意的是，在20次实验试验中，动态连续油水分离循环中的油水分离效率超过99.8%。这些结果强调了SiMAP改性海绵通过增强油水分离来解决油污染的巨大潜力。
