摘要
为了提高聚偏氟乙烯(PVDF)中空纤维共混微滤膜的渗透性,对PVDF中空纤维微滤膜进行拉伸-热定型改性,考察拉伸比、热定型时间、热定型温度对膜纯水通量和截留率的影响,并采用SEM分析处理前后膜结构的变化.结果表明:随着拉伸比增大和热定型温度升高,膜纯水通量明显上升,而截留率呈下降趋势;随着热定型时间增加,膜纯水通量先增大后减小,而截留率则先减小后增大;本文实验条件下,最佳处理工艺为拉伸10%后于90℃热定型30 min,处理后膜丝的纯水通量比原丝的提高144.82%,对碳素墨水的截留率仍能达到95.23%,拉伸时膜内产生的应力得到松驰,膜孔径增大,孔间连贯性和膜孔结构稳定性提高.
In order to improve permeability of polyvinylidene fluoride (PVDF) hollow fiber blended microfiltration membranes, the PVDF hollow fiber microfiltration membrane was modified by tensile-heat stabilization. The influences of stretching ratio, heat setting time and temperature on the pure water flux of the membrane and the rejection of carbon ink were investigated, and SEM was used to analyze the changes of membrane structure before and after treatment. The results showed that the pure water flux of membrane increases obviously with the increase of the stretching ratio and the heat setting temperature, but the rejection rate of carbon ink decreases; with the increase of heat setting time, the pure water flux of the membrane firstly increases and then decreases, while the rejection rate increases first and then decreases. On the best treatment condition, which is 10% elongation before heat setting at 90℃ for 30 min, the pure water flux of the post-treatment membrane was 144.82% higher than that of the primary membrane, and the reject rate of carbon ink can reach 95.23%. Because the stress produced in the membrane during tension is relaxed, the pore diameter is increased, and the continuity between the pores and the pore structure stability are improved.
作者
崔振宇
李维
许山山
CUI Zhen-yu;LI Wei;XU Shan-shan(School of Material Science and Engineering,Tianjin Polytechnic University,Tianjin 300387,China;State Key Laboratory of Separation Membranes and Membrane Processes,Tianjin Polytechnic University,Tianjin 300387,China)
出处
《天津工业大学学报》
CAS
北大核心
2018年第6期14-18,共5页
Journal of Tiangong University
基金
国家自然科学基金资助项目(21576209)
关键词
PVDF
中空纤维共混膜
拉伸-热定型
纯水通量
截留率
渗透性能
PVDF
hollow fiber blended microfiltration membrane
drawing and heat setting
pure water flux
rejection rate
permeability
