多巴胺改性废弃口罩制备超亲水油水分离膜

Preparation of superhydrophilic oil/water separation membranes from dopamine modified waste masks

始于2019年底的新型冠状病毒(COVID-19)的传播,使得废弃口罩的处置成为人类面临的新挑战。通过在废弃口罩表面原位沉积SiO2纳米颗粒,进而接枝多巴胺(DA),制备得到性能优良的超亲水油水分离膜,改性后膜的水接触角为0°,重力作用下通量达到6953 L·m^(-2)·h^(-1),油水分离效率超过98.65%,且在不同酸碱度(pH=2~14)均表现出稳定的油水分离性能。废弃口罩改性制备油水分离膜为废弃口罩的处置及资源化利用提供了一种新思路,具有很好的社会经济效益。

The disposal of waste masks has become a new challenge due to the spread of COVID-19.In this work,the superhydrophilic membrane with excellent oil/water separation performance was prepared by in situ deposition of SiO2 nanoparticles and grafting dopamine(DA)on the surface of waste masks.The modified waste-mask membrane exhibits good properties with water contact angle of 0°,the water flux of 6953 L·m^(-2)·h^(-1) under gravity and the oil/water separation efficiency of 98.65%.The modified mem-brane maintains a good stable performance in acidic and alkaline solutions(pH=2—14).This work pro-vides a new and economic way for the disposal and recycle of waste masks.