低截留分子量聚醚砜超滤膜

doi:10.11949/j.issn.0438-1157.20181192

化工学报 ›› 2019, Vol. 70 ›› Issue (5): 1999-2006.DOI: 10.11949/j.issn.0438-1157.20181192

• 材料化学工程与纳米技术 • 上一篇下一篇

低截留分子量聚醚砜超滤膜

许浩¹(),顾凯锋²,李韵浩¹,周勇^2,³(),高从堦^2,³

1. 浙江工业大学化工学院，浙江杭州 310014
2. 浙江工业大学海洋学院，浙江杭州 310014
3. 浙江工业大学膜分离与;水科学技术中心，浙江杭州 310014

收稿日期:2018-10-12 修回日期:2019-02-17 出版日期:2019-05-05 发布日期:2019-05-05
通讯作者: 周勇
作者简介:<named-content content-type="corresp-name">许浩</named-content>（1992—），男，硕士研究生，<email>xh11936984@163.com</email>|周勇（1977—），男，博士，教授，<email>zhouy@zjut.edu.cn</email>
基金资助:
海岛水资源保障技术集成与示范项目(2016YFC0401508)

Polyethersulfone ultrafiltration membrane with low molecular weight cut off

Hao XU¹(),Kaifeng GU²,Yunhao LI¹,Yong ZHOU^2,³(),Congjie GAO^2,³

1. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
2. Ocean Collage, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
3. Centre of Membrane Science and Water Technology，Zhejiang University of Technology，Hangzhou 310014，Zhejiang，China

Received:2018-10-12 Revised:2019-02-17 Online:2019-05-05 Published:2019-05-05
Contact: Yong ZHOU

摘要/Abstract

摘要：

以聚醚砜(PES)为原料，均苯三甲酸(TMA)为添加剂，采用浸没沉淀相转化法制备聚醚砜超滤基膜，之后将聚乙烯醇(PVA)溶液涂覆在膜表面，经加热交联得到低截留分子量超滤膜。实验结果表明，随着聚乙烯醇浓度升高，截留分子量先减小再增加；随着热处理温度的升高，水通量减少，截留分子量减小。聚乙烯醇质量浓度为0.1%，80℃加热10 min，膜的截留分子量为900，纯水通量为6.10 L/(m²·h)。红外光谱分析证实PVA与TMA反应生成了交联结构。

关键词: 膜, 超滤, 相转化, 聚乙烯醇, 过滤

Abstract:

The PES ultrafiltration base membranes were prepared with PES, DMAc and TMA through the method of immersion precipitation phase inversion. Then PVA solution was coated on the base membranes surface and crosslinked by heating to obtain low molecular weight cut-off ultrafiltration membranes. The experimental results showed that with the increase of PVA concentration, the molecular weight cut-off first decreased and then increased; as the heat treatment temperature increased, the water flux decreased and the molecular weight cut-off decreased. When the PVA mass fraction is 0.1% and heat-treated at 80°C for 10 min, the molecular weight cut-off of the membrane was 900. The pure water flux was 6.10 L/(m²·h) . The cross-linking structure of PVA and TMA was confirmed by infrared spectroscopy analyzer.

Key words: membrane, ultrafiltration, phase inversion, polyvinyl alcohol, filtration

中图分类号:

TQ 028.8

许浩, 顾凯锋, 李韵浩, 周勇, 高从堦. 低截留分子量聚醚砜超滤膜[J]. 化工学报, 2019, 70(5): 1999-2006.

Hao XU, Kaifeng GU, Yunhao LI, Yong ZHOU, Congjie GAO. Polyethersulfone ultrafiltration membrane with low molecular weight cut off[J]. CIESC Journal, 2019, 70(5): 1999-2006.

图/表 10

表1 PES铸膜液组分

Table1 Composition of PES casting solution

PES基膜	PES/%(mass)	TMA%(mass)	DMAc%(mass)
P1	15	0	85
P2	15	1	84
P3	15	2	83
P4	15	3	82
P5	15	4	81

图1 不同TMA浓度的PES基膜的SEM图和孔径分布

Fig.1 SEM images and pore size distributions of PES base membrane with different TMA loading

表2 具有不同TMA浓度的PES基膜性能

Table 2 Performance of PES base membrane with different TMA loading

PES基膜	水通量/(L/(m²·h))	接触角/(°)	表面孔径/nm
P1	116.02±40	75.05±3	11.2
P2	149.53±30	55.36±1	14.9
P3	412.63±50	53.85±3	13.5
P4	624.9±150	64.45±1	15.2
P5	726.83±70	60.38±1	18.4

图2 引入TMA前后PES膜C 1s的XPS谱图

Fig.2 XPS C 1s spectra of PES base membrane with different TMA loading

表3 具有不同TMA浓度的PES基膜的表面元素组成

Table 3 Element composition of PES base membrane with different TMA concent

TMA concent/%(mass)	元素含量/%(atom)
TMA concent/%(mass)	C(理论/实际)	O(理论/实际)	S(理论/实际)	O/C(理论/实际)
0	75/72.79	18.75/20.27	7.25/6.94	0.25/0.278
1	69.66/69.73	26.31/25.96	4.03/4.31	0.379/0.372
2	67.13/70.76	29.91/25.49	2.96/3.75	0.446/0.360
3	65.65/70.55	32.00/25.29	2.35/4.15	0.487/0.358

图3 PVA浓度对膜性能的影响

Fig.3 Effect of PVA concentration on membrane performance

表4 不同PVA含量的膜对PEG的截留率

Table 4 PEG rejection rate of different PVA contents membranes

PVA concent/%(mass)	Rejection rate to different molecular weight PEGs，R/%
PVA concent/%(mass)	10000	6000	4000	2000	1000	800
0.02	87.14	86.44	80.04	?	?	?
0.03	89.19	89.58	84.52	?	?	?
0.05	97.32	94.95	87.70	?	?	?
0.1	98.06	96.74	95.06	96.67	95.04	84.09
0.2	99.04	98.42	97.65	97.10	94.24	66.50

图4 热处理温度对改性膜的影响(0.1%PVA)

Fig.4 Effect of heat-treated temperature on modified membranes (0.1%PVA)

图5 超滤膜的红外光谱分析[0.1%(mass)PVA,80℃]

Fig.5 Infrared spectrum analysis of ultrafiltration membranes[0.1%(mass)PVA,80℃]

图6 具有不同PVA浓度的PES改性膜的SEM图(80℃)

Fig.6 SEM images of PVA modified PES membrane with different PVA concentrations (80℃)

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低截留分子量聚醚砜超滤膜

Polyethersulfone ultrafiltration membrane with low molecular weight cut off

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