首页|绿色纤维素基水凝胶膜的制备及油水分离性能

绿色纤维素基水凝胶膜的制备及油水分离性能

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以杨木粉(PF)中提取的纤维素木浆(PF-NA)为基底,通过冷冻盐析技术,利用聚乙烯醇(PVA)将LiCl颗粒包裹在纤维素骨架上制备了纤维素基(CLH)水凝胶膜.采用FTIR、SEM、XRD、XPS对CLH水凝胶膜进行了表征,对其机械、高温、耐酸碱和耐盐稳定性、自清洁和耐污性进行了测试.结果表明,CLH水凝胶膜具有三维层状结构,PVA的加入及冷冻盐析技术的利用提高了 CLH水凝胶膜的力学性能.LiCl作为吸水单元分布在纤维素骨架周围,使CLH水凝胶膜具有超亲水性,水下油接触角为151°;在重力作用下,CLH水凝胶膜可以实现对油水混合物和水包油乳液的高效分离,在高温(60 ℃)、强酸(pH=3)和强碱(pH=13)条件下具有稳定的分离效率(≥99.8％);在循环分离12次水包机油乳液中,CLH水凝胶膜保持稳定的分离性能;CLH水凝胶膜对四氯乙烯油渍具有自清洁和耐污能力.
Preparation and oil-water separation performance of green cellulose-based hydrogel membrane
Cellulose-based(CLH)hydrogel membrane was prepared by encapsulating LiCl particles on the cellulose scaffold,which was cellulose pulp(PF-NA)extracted from poplar wood powder(PF),with polyvinyl alcohol(PVA)via freezing and salting out technique.The CLH hydrogel membrane obtained was then characterized by FTIR,SEM,XRD,and XPS,and evaluated for its mechanical performance,resistance in high-temperature,acid-base as well as salt,self-cleaning,and anti-fouling.The results indicated that CLH hydrogel membrane exhibited three-dimensional layered structures,while the addition of PVA and the utilization of freezing and salting out technique enhanced its mechanical performance.Hydrophilic LiCl,distributed around the cellulose scaffold,made the CLH hydrogel membrane super-hydrophilic with an underwater oil contact angle of 151°.Under the influence of gravity,the CLH hydrogel membrane effectively separated oil/water mixtures and oil-in-water emulsions,maintaining stable separation efficiency(≥99.8％)under harsh conditions of high-temperature(60 ℃),strong acid(pH=3),and strong alkali(pH=13).Moreover,the CLH hydrogel membrane exhibited consistent separation performance over 12 cycles of engine oil-in-water emulsion separation and demonstrated self-cleaning and anti-fouling capabilities against tetrachloroethylene oil stains.

cellulose hydrogel membranesPVAfreezing and salting outwaste wood recyclinggravity-drivenoil-water separationfunctional materials

曹妍、高军凯、夏孟胜、徐彭涛、韩志、陈妍

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浙江海洋大学船舶与海运学院,浙江舟山 316022

江苏大学能源与动力工程学院,江苏镇江 212000

纤维素水凝胶膜 聚乙烯醇 冷冻盐析 废木材回收 重力驱动 油水分离 功能材料

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

51606168NDJZW2021Z-4521JDG0482021JGZZ011

2024

10.13550/j.jxhg.20230468

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(5)
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