改性废弃口罩熔喷布疏水膜的制备及油水分离性能

Oil-water separation performance of hydrophobic membranes prepared from modified meltblown cloth of waste masks

通过原位化学沉积在废弃口罩熔喷布表面负载均匀分散的二氧化硅(SiO_(2))纳米颗粒,进而接枝十八烷基三氯硅烷(OTS),得到具有多级粗糙结构的疏水膜。改性膜的水接触角达到142.5°,重力作用下四氯化碳通量达到12224 L·m^(-2)·h^(-1),油水分离效率大于98%。结果表明改性膜能够在酸性、碱性、盐溶液以及超声等条件下保持性能稳定,具有很好的应用前景,为废弃口罩的绿色、低碳、资源化利用提供了新思路。

Waste mask treatment becomes a new challenge due to the COVID-19 pandemic.In this work,the meltblown cloth of waste masks were modified via grafting octadecyltrichlorosilane(OTS)onto hydrophobic membranes with multilevel rough structures.Silicon dioxide(SiO_(2))nanoparticles were loaded on waste masks by in situ chemical deposition.And then the OTS molecules were grafted onto the surface of SiO_(2) nanoparticles.The modified membranes exhibit good properties with a water contact angle of 142.5°and carbon tetrachloride flux of 12224 L·m^(-2)·h^(-1) under gravity.Our results show that the oil-water separation efficiency of the modified membrane is over 98%.The modified membrane maintains stable performance in acidic,alkaline,salty solvents and ultrasonic environments.This work provides a new green and low-carbon way for the recycling of waste masks.