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基于强氢键作用的超分子微纳米涂层改性滤膜

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为解决油水分离滤膜循环使用性差的问题,采用超分子鞣酸-聚乙烯醇(TA-PVA)黏结剂黏附鞣酸-铜(TA-CuⅡ)形成鞣酸-聚乙烯醇-铜(TA-PVA-CuⅡ)涂层改性聚偏氟乙烯(PVDF)膜,制备了具有稳定微纳米涂层的超亲水/水下超疏油膜(TA-PVA-CuⅡ@PVDF).采用 SEM、FTIR、XPS 对制备的膜进行了表征,对改性前后PVDF膜的表面润湿性、油水分离性进行了测试,考察了二价铜离子改性时间对TA-PVA-CuⅡ@PVDF循环使用性以及涂层耐久性的影响.结果表明,在亲水性 TA-PVA-CuⅡ微纳米涂层的作用下,TA-PVA-CuⅡ@PVDF 的水接触角和水下油接触角分别可达到 0°和 151.0°,其对乳化油的分离膜通量和分离效率最高分别可达 1169.30 L/(m2·h)和 99.99%,展现出优异的油水分离性能.二价铜离子改性时间为 20 min 时,TA-PVA-CuⅡ@PVDF循环稳定性和耐久性最佳,具有15次的循环分离次数,并且通量改变率为6.6%.
Supramolecular micro-nano coating based on strong hydrogen bonding modified filter membrane
In order to solve the problem of poor recyclability of oil/water separation filter membrane,superhydrophilic/underwater superoleophobic tannic acid-polyvinyl alcohol-copper(TA-PVA-CuⅡ)coating modified polyvinylidene fluoride(PVDF)filter membrane(TA-PVA-CuⅡ@PVDF)was synthesized from modification of PVDF membrane with stable micro-nano coating obtained as adhesive of tannic acid-copper(TA-CuⅡ)with supramolecular tannic acid-polyvinyl alcohol(TA-PVA)as adhesive,and characterized by SEM,FTIR and XPS.The surface wettability and oil-water separation performance of PVDF membrane before and after modification were evaluated,while the influence of bivalent copper ion modification time on the reusability of TA-PVA-CuⅡ@PVDF and the durability of the coating were further investigated.The results showed that under the function of hydrophilic micro-nano coating of TA-PVA-CuⅡ,the TA-PVA-CuⅡ@PVDF exhibited a water contact angle of 0° and underwater oil contact angle of 151.0°.In addition,the membrane flux and separation efficiency of TA-PVA-CuⅡ@PVDF about emulsified oil could reach 1169.30 L/(m2·h)and 99.99%,respectively,indicating excellent oil/water separation performance.The TA-PVA-CuⅡ@PVDF modified by CuⅡ for 20 min showed the best recyclability and coating durability with 15 cycles of separation times and a flux change rate of 6.6%.

strong hydrogen bondingmicro-nano coatingfilter membraneoil/water separationrecyclabilityfunctional materials

曹雪、蔡苗苗、李玉乐、韩志、高军凯

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浙江海洋大学 船舶与海运学院,浙江 舟山 316022

浙江海洋大学 海洋工程装备学院,浙江舟山 316022

江苏大学 能源与动力工程学院,江苏 镇江 212013

强氢键作用 微纳米涂层 滤膜 油水分离 循环稳定性 功能材料

国家自然科学基金江苏大学高级人才科研启动基金教指委高等学校能源动力类教学研究与实践项目

5160616821JDG048NDJZW2021Z-45

2024

精细化工
大连化工研究院设计院 中国化工学会精细化工专业委员会 辽宁省化工研究院

精细化工

CSTPCD北大核心
影响因子:0.557
ISSN:1003-5214
年,卷(期):2024.41(4)
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