Surface modification of reverse osmosis membrane by electrostatic deposition of polyelectrolyte for performance improvement

LIU Meiling; LIU Jun; WANG Qin; TAN Yong; LI Bao'an

doi:10.11949/j.issn.0438-1157.20171021

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Surface modification of reverse osmosis membrane by electrostatic deposition of polyelectrolyte for performance improvement

更新时间：2025-12-10

- Surface modification of reverse osmosis membrane by electrostatic deposition of polyelectrolyte for performance improvement
- CIESC Journal Issue 2, Pages: 830-839(2018)
- 作者机构：
  
  1. 化学工程联合国家重点实验室, 天津大学化工学院,天津,300072
  2. 天津化学化工协同创新中心,天津,300072
  3. 天津市膜科学与海水淡化技术重点实验室,天津,300072
  4. 广州市水务局,广东,广州,510640
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20171021
  CLC： Q028.8
- Online First：05 February 2018，
  
  Published：05 February 2018
- 稿件说明：
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LIU Meiling, LIU Jun, WANG Qin, et al. Surface modification of reverse osmosis membrane by electrostatic deposition of polyelectrolyte for performance improvement[J]. CIESC Journal, 2018, (2): 830-839.
DOI：

LIU Meiling, LIU Jun, WANG Qin, et al. Surface modification of reverse osmosis membrane by electrostatic deposition of polyelectrolyte for performance improvement[J]. CIESC Journal, 2018, (2): 830-839. DOI： 10.11949/j.issn.0438-1157.20171021.

摘要

利用次氯酸钠溶液对商品反渗透膜表面进行氯化处理，然后将聚阳离子电解质壳聚糖通过静电吸附作用沉积在RO膜的表面，系统地研究了氯化过程的pH、氯化时间、次氯酸钠浓度、壳聚糖浓度及其沉积时间对膜性能的影响，以制备出高通量、高截留率的RO膜。在压力1.55 MPa、原料液温度（298±1）K的条件下，测定RO膜处理2000 μg·g-1氯化钠溶液的水通量和截留率。结果表明，当pH=9、氯化时间为30 min、次氯酸钠浓度为1000 mg·L-1时，水通量较原膜提高了约19.89%，截留率略有提高；当壳聚糖浓度为0.1%（质量分数）、沉积时间为30 min时，改性膜的接触角降低到34.88°，亲水性提高，水通量较氯化后的RO膜几乎保持不变，为60.55 L·m-2·h-1，截留率达到了99.56%。经过氯化和沉积改性后的RO膜水通量和截留率均得到了提高。

Abstract

The commercial reverse osmosis (RO) membrane surface was chlorinated with the sodium hypochlorite solution. Then the chitosan as a polycation electrolyte was deposited on the chlorinated RO membrane surface with the help of electrostatic adsorption. With the aim of preparing high flux and high salt rejection RO membrane

the effects of solution pH

chlorination time

sodium hypochlorite concentration

chitosan concentration and deposition time on membrane performance were systematically studied. The water flux and the salt rejection were measured at 1.55 MPa and (298±1) K for a feed NaCl concentration of 2000 μg·g-1. The results showed that

compared to the original RO membrane

the water flux of the chlorinated membrane increased by 19.89% when the chlorination solution pH=9

the chlorination time was 30 min and the chlorination concentration was 1000 mg·L-1. A slightly increase of the salt rejection was also observed. Further modification of chitosan deposition on the chlorinated membrane surface showed that the membrane surface hydrophilicity was enhanced. When the chitosan concentration was 0.1%(mass) and the deposition time was 30 min

the water contact angle of the membrane surface was 34.88° and the salt rejection improved to 99.56%. The water flux of the deposition modified membrane reached 60.55 L·m-2·h-1

which was nearly maintained the same as the chlorinated RO membrane above. These results indicated that both the water flux and the salt rejection of the modified commercial RO membrane improved after the surface modification through chlorination and chitosan deposition.

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