超亲水/水下疏油高硅布的制备及其油水分离性能.

High silica cloth (HSC) with high mechanical strength, good flexibility, superior heat and acid resistance has been modified by one-step grafting method and self-polymerization method. 3-Aminopropyltriethoxysilane (APTES) is grafted on HSC's surface as a double-side adhesive. Nano SiO2 is used to provide surface roughness by electrostatic deposition. After that, polydopamine (PDA) with strong hydrophilic properties is polymerized on the surface of HSC to obtain super-hydrophilic/underwater oil-phobic high silica cloth (APTES/SiO2/ PDA@HSC). The effect of different sizes (50, 300, 500 nm) of SiO2 on the oil-water separation performance is studied. The separation efficiency decreases with the increase of SiO2 size. APTES/50 nm SiO2/PDA@HSC shows the best performance. Its water contact angle is 0(°) and the separation efficiency is about 98%. The oil content of the filtrate after separating the gasoline-water mixture is as low as 37 mg/L and the oil-water mixture flux is 7184 L/(m² ·h). Its separation efficiency can still reach 97. 4% after 10 cycles, and it also has obvious oil-water separation effect on peanut oil and pump oil. [ABSTRACT FROM AUTHOR]