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.
关键词
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
Key words
cellulose hydrogel membranes/PVA/freezing and salting out/waste wood recycling/gravity-driven/oil-water separation/functional materials
维普
万方数据