富咪唑型多孔左旋聚乳酸纳米纤维膜制备及其双重净水性能  

Preparation of porous poly(L-lactic acid)nanofiber membranes with rich imidazole groups and dual performances in water purification

作　　者：闫迪 王雪芳 谭文萍 高国金 明津法 宁新 YAN Di;WANG Xuefang;TAN Wenping;GAO Guojin;MING Jinfa;NING Xin(College of Textile&Clothing,Qingdao University,Qingdao,Shandong 266071,China;Industrial Research Institute of Nonwovens&Technical Textiles,Qingdao University,Qingdao,Shandong 266071,China;Shandong Special Nonwoven Materials Engineering Research Center,Qingdao,Shandong 266071,China;State Key Laboratory of Bio-Fibers and Eco-Textiles,Qingdao,Shandong 266071,China)

机构地区：[1]青岛大学纺织服装学院,山东青岛266071 [2]青岛大学非织造材料与产业用纺织品创新研究院,山东青岛266071 [3]山东省特型非织造材料工程研究中心,山东青岛266071 [4]生物多糖纤维成形与生态纺织国家重点实验室,山东青岛266071

出　　处：《纺织学报》2024年第8期116-126,共11页Journal of Textile Research

基　　金：国家重点研发计划项目(2021YFB3801905);生物多糖纤维成形与生态纺织国家重点实验室课题(RZ2000003348);山东省博士后创新项目(SDCX-ZG-202203011);青岛市博士后应用研究项目(QDBSH20210200043)。

摘　　要：为开发具有油水分离和吸附重金属离子双重功能的新型膜材料,利用静电纺丝技术制备左旋聚乳酸(PLLA)纳米纤维膜,再依次采用溶剂诱导结晶和1-(3-氨基丙基)咪唑(API)修饰改性得到富咪唑型多孔PLLA纳米纤维膜,并对其微观形貌、化学基团构成、力学性能和润湿性能进行测试与表征,研究了该纳米纤维膜的油水分离性能和对铜离子的吸附性能。结果表明:当丙酮与水体积比为10∶1、丙酮/水混合溶液用量为0.4 mL/(mg纤维)、处理时间为150 s时,溶剂诱导结晶处理所得PLLA纳米纤维膜中多孔纤维的形貌最佳;API修饰改性并未对多孔纤维的形貌和直径产生过多影响,改性后PLLA纳米纤维膜表面出现的咪唑和酰胺基团能够有效改善其润湿性能,使静态水接触角下降了15.6°;与未改性PLLA纳米纤维膜相比,所制得富咪唑型多孔PLLA纳米纤维膜的脆性有所增加,但其断裂强度仍能达到未改性的PLLA纳米纤维膜断裂强度的96.6%,整体力学性能保持良好;利用该纳米纤维膜可实现有效油水分离,分离通量为1044.9 L/(m^(2)·h),分离效率可达99.1%,且其对铜离子吸附性能良好,在pH值为6的铜离子溶液中接触24 h后,对铜离子吸附量可达41.46 mg/g。Objective Water pollution is a worldwide challenge,and it has attracted much research attention.Poly(L-lactic acid)(PLLA)is a biodegradable polymer displaying excellent prospects in water purification,and it is mostly designed to purify single pollutants displaying limited purification effect on others.Therefore,it is necessary to develop novel PLLA materials with more purifying functions to enhance the applicability of PLLA in water purification.Herein,solvent-induced crystallization and surface modification methods were applied to functionalize PLLA nanofiber membranes(NFMs)to enable oil/water separation and copper ions(Cu^(2+))adsorption performances.Method PLLA NFMs were prepared by electrospinning,and were then treated via solvent-induced crystallization to prepare porous PLLA NFMs,followed by N-(3-aminopropyl)-imidazole(API)modification to obtain imidazole-modified PLLA NFMs.The microstructures and chemical compositions of PLLA NFMs were respectively characterized by SEM and FT-IR,and their wettability and mechanical properties were respectively measured on contact angle goniometer and universal material testing machine.Oil/water separation performances of PLLA NFMs were characterized by testing their separation flux and efficiency.Qualitative and quantitative methods were used to evaluate the Cu^(2+)adsorption performances of imidazole-modified PLLA NFMs.Results Smooth and straight PLLA fibers with the average diameter of 885 nm were successfully prepared by electrospinning.After solvent-induced crystallization treatment based on the orthogonal experiments,the porous fibers in sample 6 displayed a better morphology than others,and the optimal condition was that the volume ratio of acetone and water was 10∶1,the applied dosage of acetone and water mixed solvent was 0.4 mL/mg,and the treatment time was 150 s.Compared to porous PLLA NFMs,the porous morphology of the imidazole-modified PLLA fibers did not change obviously,and their average diameter about 1041 nm was close to that of porous fibers,probably ow

关 键 词：左旋聚乳酸 多孔纤维 咪唑改性 油水分离 重金属离子吸附 静电纺丝 污水处理 

分 类 号：TS171[轻工技术与工程—纺织材料与纺织品设计]