摘要
以N,N'-二甲基甲酰胺和丙酮为混合溶剂,采用静电纺丝法制备基于无纺布支撑的聚偏氟乙烯(PVDF)静电纺丝纳米纤维膜,考察了不同溶剂配比对膜结构与膜性能的影响;利用扫描电子显微镜、接触角测量及膜蒸馏脱盐实验等对疏水膜的结构及性能进行表征。结果表明,由混合溶剂制备的静电纺丝纳米纤维膜具有较高的盐截留率和膜通量,并拥有很强的疏水性,接触角最高可达142.8°。以质量浓度35 g/L的Na Cl溶液为进料液对制备的纳米纤维膜进行直接接触式膜蒸馏实验,在进水温度80℃、冷测循环水温度20℃的条件下,膜通量最高可达46.05 kg/(m2·h),盐截留率为99.99%。
The polyvinylidene fluoride （PVDF） electro-spinning membranes based on the support of nonwoven fabric with mixed solvents of N,N＇-dimethyl- formamide （DMF） and acetone were prepared, and the influences of different ratios of solvent on structure and performance of the resultant membranes were investigated by scanning electron microscope, contact angle goniometer and membrane distillation experiment. The results showed that the membranes prepared from mixed solvents exhibited high rejection of salt, high permeate flux, and excellent hydrophohicity, and its contact angle reached 142.8°. During the desalination process of 35 g/L NaCI solution by direct contact membrane distillation with the self-prepared membranes, a maximum flux 46.05 kg/（m^2·h） was achieved and the rejection of NaCl maintained 99.99% with the feed-solution at 80℃ and the cold distillate water at 20℃.
出处
《水处理技术》
CAS
CSCD
北大核心
2015年第5期30-33,38,共5页
Technology of Water Treatment
基金
国家自然科学基金资助项目(51478454)
环境模拟与污染控制国家重点联合实验室(环境水质学实验室)自主申请课题(13Z04ESPCT)
关键词
聚偏氟乙烯
静电纺丝
膜通量
膜蒸馏
疏水性
polyvinylidene fluoride
electro-spinning
permeate flux
membrane distillation
hydrophobicity
