CIESC Journal ›› 2019, Vol. 70 ›› Issue (7): 2766-2774.DOI: 10.11949/0438-1157.20190078

• Material science and engineering, nanotechnology • Previous Articles     Next Articles

Carboxyl functionalization and reverse osmosis performance of ethenylene-bridged organosilica membranes

Rong XU(),Xu CHENG,Song DENG,Lyu QI,Xiuxiu REN,Qi ZHANG,Jing ZHONG()   

  1. Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, Jiangsu, China
  • Received:2019-01-25 Revised:2019-04-10 Online:2019-07-05 Published:2019-07-05
  • Contact: Jing ZHONG

乙烯基桥联有机硅膜的羧基化改性及反渗透性能研究

徐荣(),程旭,邓松,戚律,任秀秀,张琪,钟璟()   

  1. 常州大学石油化工学院,江苏省绿色催化材料与技术重点实验室,江苏 常州 213164
  • 通讯作者: 钟璟
  • 作者简介:徐荣(1983—),男,博士,副教授,<email>xurong@cczu.edu.cn</email>
  • 基金资助:
    国家自然科学基金项目(21406018);常州市科技计划项目(CJ20179053);江苏省绿色催化材料与技术重点实验室项目(BM2012110);江苏省先进催化与绿色制造协同创新中心(常州大学)

Abstract:

Carboxyl functionalized bridged-type organosilica membranes were prepared via the thiol-ene click reaction between 1,2-bis(triethoxysilyl)ethylene (BTESEthy) and mercaptosuccinic acid (MSA), using tubular α-Al2O3 microfiltration membranes as the supports. The membrane structure and surface properties were characterized by Fourier transform infrared spectroscopy (FT-IR), dynamic light scattering (DLS), intelligent gravimetric analyzer (IGA) and scanning electron microscopy (SEM). Quantum chemistry calculations show that the carboxylated modified silicone network has a denser pore structure and higher water affinity. The prepared BTESEthy-MSA membranes were applied to desalination by reverse osmosis. The reverse osmosis performance of BTESEthy-MSA membranes was systematically investigated. The experimental results showed that compared with the original BTESEthy membranes, both water permeability and salt rejection of the carboxyl functionalized BTESEthy-MSA membranes were improved. Meanwhile, the BTESEthy-MSA membranes exhibit superior hydrothermal stability and chlorine resistance. Moreover, the BTESEthy-MSA membranes exhibited high stability over long term reverse osmosis test of 250 h, and high water permeability of 3.2×10-13 m3/(m2·s·Pa) and NaCl rejections of >94.7%.

Key words: membrane, organosilica, carboxyl functionalization, reverse osmosis, desalination, permeability

摘要:

利用1,2-二(三乙氧基硅基)乙烯(BTESEthy)和硫代苹果酸(MSA)的巯基-烯点击反应对桥联有机硅进行羧基化改性,以管式α-Al2O3微滤膜为支撑体制备羧基官能化的桥联有机硅膜。通过傅里叶变换红外光谱(FT-IR)、激光粒度仪(DLS)、智能重量分析仪(IGA)和扫描电镜(SEM)等对膜结构和表面性质进行了表征。量子化学计算表明羧基化改性的有机硅网络拥有更加致密的孔结构和更高的水亲和力。将改性的BTESEthy-MSA膜用于反渗透脱盐,系统考察了BTESEthy-MSA膜反渗透脱盐性能。实验结果表明,与BTESEthy膜相比,羧基化改性的BTESEthy-MSA膜的水渗透率和盐截留率均有所提高。同时,BTESEthy-MSA膜表现出优异的水热稳定性和耐氯性能。在250 h的长期反渗透测试中,BTESEthy-MSA膜的水渗透率高达3.2×10-13 m3/(m2·s·Pa),NaCl截留率始终保持在94.7%以上。

关键词: 膜, 有机硅, 羧基化, 反渗透, 脱盐, 渗透率

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