摘要
为提高聚四氟乙烯(PTFE)中空纤维膜的亲水耐久性并赋予其一定的抗污染和抗菌的功能性,提出了一种低成本、简单的表面改性方法。亲水性的增强是表面化学成分和微纳粗糙度结构协同作用的结果。使用聚乙烯醇(PVA)和聚乙烯亚胺(PEI)作为亲水改性剂,戊二醛(GA)作为交联剂,在PTFE中空纤维表面构建了一层抗菌亲水层。在γ-缩水氧基丙基三甲氧基硅烷(KH560)的作用下,膜纤维表面成功形成了微纳米结构,进一步增强了膜纤维的亲水性和耐久性。值得注意的是,改性后的中空纤维膜具有超亲水性(WAC=0°)和出色的水通量(8185.38±178.27 L·m^(-2)·h^(-1))。经过14 d的酸(pH=1)、碱(pH=14)以及强氧化剂(3000 ppm Na⁃ClO)溶液人工加速清洗后,改性膜仍保持其超亲水性,且不损失水通量。研究表明,这种简便的亲水改性策略使得PTFE中空纤维膜在污水处理领域具有实际应用价值。
A low-cost and simple modification method is proposed to enhance the durable superhydrophilicity of polytetrafluoroethylene(PTFE)hollow fiber membranes with anti-fouling and antibacterial functionalities.The enhancement of hydrophilic properties is attributed to the synergistic effects of the surface's chemical composition and the micro-nano roughness structure.In this study,polyvinyl alcohol(PVA)and polyethyleneimine(PEI)were employed as hydrophilic modifiers,while glutaraldehyde(GA)served as a crosslinking agent,to construct an antibacterial and hydrophilic layer on the surface of PTFE hollow fiber membranes.The hydrophilicity and durability are further enhanced by the successful formation of micro/nano structure on the membrane fibers after the instruction ofγ-glycidoxypropyltrimethoxysilane(KH560).Notably,the modified hollow fiber membranes demonstrate superhydrophilicity(WCA=0°)and exhibits excellent water flux(8185.38±178.27 L·m^(-2)·h^(-1)).After undergoing artificial accelerated cleaning in acid(pH=1),alkali(pH=14),and oxidant(3000 ppm NaClO)solutions for 14 days,the modified membranes still maintain their superhydrophilicity without the loss of water flux.This simple hydrophilic modification strategy endows PTFE hollow fiber membranes with practical application in the field of sewage treatment.
作者
叶红
徐荣康
吴明元
吴庆云
杨建军
刘久逸
张建安
Ye Hong;Xu Rongkang;Wu Mingyuan;Wu Qingyun;Yang Jianjun;Liu Jiuyi;Zhang Jianan(School of Chemistry and Chemical Engineering,Anhui University;Anhui Province Key Laboratory of Environment-Friendly Polymer Materials,Hefei 230604,China;Institute of Physical Science and Information Technology,Anhui University,Hefei 230601,China)
出处
《涂层与防护》
2024年第8期17-22,23-26,43,共11页
Coating and Protection
基金
安徽省高等学校自然科学研究重大项目(KJ2019ZD01)
安徽省留学人员创新重点项目(2019LCX006)
安徽省高等学校自然科学研究项目(KJ2018A0036)。
关键词
PTFE中空纤维膜
超亲水性
化学耐久
抗污染
抗菌
PTFE hollow fiber membrane
superhydrophilicity
chemical durability
anti-pollution
antibacterial
