PDA@BN@SiO 2 @OTS coated superhydrophobic paper with good mechanical durability and self-cleaning function for oil-water separation

With the development of industry, the irregular discharge of some oily wastewater and the occurrence of marine oil spill accidents, the water resources environment has been affected to varying degrees, and also jeopardize human health to varying degrees. In recent years, the problem of oil-water separation has received a lot of attention, and it is extremely important to find a simple and efficient oil-water separation method. In this study, we used dopamine-induced enhancement of boron nitride attachment, followed by the use of silica combined with long carbon chains of octadecyltrichlorosilane to achieve surface superhydrophobicity. The prepared superhydrophobic paper reaches a superhydrophobic angle of 165°, and the oil-water separation efficiency reaches an efficiency of more than 99%, and its separation efficiency and hydrophobic angle still remain very good after 40 times of cyclic separations. Water-in-oil emulsions can also be separated with a separation efficiency of up to 89.2%, which stabilizes after 10 cycles of separation. It maintains an excellent hydrophobicity under harsh environmental conditions such as organic, acidic and alkaline solutions, and also has good friction resistance. Overall, this study provides a new direction for the development of durable and multifunctional superhydrophobic paper to solve the problem of oil-water separation, as well as a new research avenue for the potential application of paper-based materials.