乙烯醇
超亲水性
乳状液
材料科学
膜
化学工程
分散剂
静电纺丝
涂层
接触角
色散(光学)
化学
聚合物
复合材料
生物化学
工程类
物理
光学
作者
Dacheng Zhong,Xiaoyuan Wang,Jingjing Wang
标识
DOI:10.1016/j.surfcoat.2023.129421
摘要
Most nanofibrous membranes were electrospun from organic solutions. Because organic solvents are usually volatile and poisonous, they can cause unfavorable influence on the natural environment and human health. In this work, poly(vinyl alcohol)/silicon [email protected] (PVA/SiO2@PDA) membrane was fabricated by green electrospinning of aqueous dispersion of PVA and SiO2 combined with deposition of PDA in the presence of strong oxidant sodium periodate. Notably, PDA coating with distinguished superhydrophilic and underwater superoleophobic property was obtained due to producing carboxyl components during degradation of quinone units. When the PVA/SiO2@PDA membrane was immersed in water, a stable hydrated layer produced on the membrane surface due to the presence of hydrophilic groups. The hydrophilicity of this hydrated layer could make water molecules pass through the membrane successfully and effectively prevent infiltration of oil droplets. This superhydrophilic and underwater superoleophobic membrane showed excellent oil/water separation performance for various oil-in-water emulsions. The maximum permeate flux reached 4413.96 L·m−2·h−1 with separation efficiency higher than 99.2 %. Moreover, excellent chemical stability as well as outstanding antifouling performance of the PDA-modified electrospun membrane provided long-term durability for oil/water separation. The developed PVA/SiO2@PDA membrane with superwetting property and good reusability exhibited prospective potential in the remediation of oily wastewater.
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