摘 要:本文将聚甲基丙烯酸-N,N-二甲氨基乙酯(PDMAEMA)改性凹土添加到铸膜液中,通过相转换法制备PVDF/PGS-g-PDMAEMA混合基质超滤膜,考察了改性凹土添加量对聚偏氟乙烯(PVDF)超滤膜的微观结构、孔隙率、孔径和纯水通量的影响。实验结果表明, 改性凹土的添加量对膜孔径的影响不大;随着改性凹土添加量的增大,纯水通量和孔隙率也相应的增大,但膜的热稳定性降低;同时,制得的膜指状孔数增加,孔长度变长,晶粒较多、较大且缺陷孔较少。综合考虑,当改性凹土添加量为7 wt。%时,改性膜的综合性能最优。85715
毕业论文关键词:改性凹土添加量,PVDF超滤膜,膜结构,相转换法
Abstract: In this paper, poly [2-(N,N-dimethyl amino)-ethyl methacrylate] (PDMAEMA) modified palygorskite was added to the casting solution。 PVDF/PGS-g-PDMAEMA mixed matrix ultrafiltration membrane was prepared by phase conversion method。 The effects of the pore size, pure water flux, porosity and microstructure of PVDF ultrafiltration membrane with different addition amount of modified palygorskite were investigated。 The experimental results showed the addition amount of modified palygorskite has little effect on the pore size of membrane。 With the increase of the amount of modified palygorskite, the pure water flux and porosity increased correspondingly, but the thermal stability of the membrane was decreased。 At the same time, the number of finger holes increased。 And the length of the holes became longer。 The grains were larger and the defect holes were less。 Considering that when the amount of modified palygorskite was 7 wt。%, the comprehensive performance of the modified membrane was the best。
Keywords: addition amount of palygorskite, PVDF ultrafiltration membrane, membrane structure, phase conversion method
目 录
1 引言 4
1。1 膜分离技术 4
1。2 聚偏氟乙烯超滤膜源Q于W优H尔J论K文M网WwW.youeRw.com 原文+QQ75201.,8766 的制备及应用 5
1。3 主要研究内容 6
2 实验部分 6
2。1 实验主要药品和仪器 6
2。2 PVDF/PGS-g-PDMAEMA超滤膜的制备 8
2。3 膜的表征 8
2。4 孔隙率测试 9
2。5 孔径测试 9
2。6 纯水通量 9
3 实验结果与分析 9
3。1 红外光谱分析(FTIR) 9
3。2 X射线衍射分析(XRD) 10
3。3 扫描电镜分析(SEM) 11
3。4 热重分析(TG) 11
3。5 孔隙率分析 12
3。6 孔径分析 12
3。7 纯水通量分析 14
结论 15
参考文献 16
致谢 18
1 引言
1。1 膜分离技术 来自优W尔Y论W文C网WWw.YoueRw.com 加QQ7520,18766
膜分离技术是一种高效分离固液体系的新型技术[1]。膜是一种具有选择透过性质的介质,能利用外界能量或在化学位差的推动下,在渗透作用下,对混合的液体或气体进行分离和提纯[2]。目前已经深入研究和开发的膜分离技术[3]有微滤、超滤、纳滤、反渗透、电渗析、渗透气化和气体分离等。正在开发研究中新的膜过程有膜蒸馏、支撑液膜、膜萃取、膜生物反应器、控制释放膜、仿生膜以及生物膜等。