膜科学与技术

有机/无机杂化TiO2纳米粒子掺杂改性复合正渗透膜活性分离层的研究

作者：况武¹，²，康国栋¹，刘中楠¹，²，周美青¹，刘丹丹¹，曹义鸣¹，＊

单位： 1.中国科学院大连化学物理研究所，大连116023；2.中国科学院大学，北京100049

关键词：纳米二氧化钛；正渗透；内浓差极化；表面改性

出版年,卷(期):页码： 2016,36(6):25-31

摘要：

通过自由基聚合在纳米二氧化钛（TiO2）表面接枝聚甲基丙烯酸甲酯（PHEMA），得到有机/无机杂化的TiO2-PHEMA纳米粒子，作为界面聚合制备复合正渗透（FO）膜的有机相添加剂，对活性分离层进行掺杂改性。考察了TiO2-PHEMA粒子含量对分离层结构与性质以及膜性能的影响。结果显示，当TiO2-PHEMA添加量为有机相均苯三甲酰氯溶液的0.1 wt.% (w/w）时，FO膜的表面水接触角下降到47.7°，均方根表面粗糙度增加到99.5 nm，表明TiO2-PHEMA的加入显著提高了分离层的亲水性以及膜表面粗糙度。在AL-FS（分离层面向原料液）和AL-DS（分离层面向驱动液）两种操作模式下，复合膜的水通量分别从6.8 L/(m2h)和12.2 L/(m2h)增加到23.6 L/(m2h)和39.2 L/(m2h)，并保持着较高的NaCl截留率（R > 90%）。

The organic-inorganic hybrid titanium dioxide (TiO2) nanoparticles were synthesized by grafting poly (2-hydroxyethyl methacrylate) (PHEMA) to the surface via radical polymerization and used as additive to fabricate the active layer of flat-sheet thin film composite forward osmosis (TFC-FO) membranes by interfacial polymerization. The influence of TiO2-PHEMA loadings on properties and structure of active layer and membrane performance were investigated. The results showed that the addition of TiO2-PHEMA had significant influences on both hydrophilicity and surface roughness. When the content of nanoparticles increased to 0.1 wt%, the water contact angle decreased to 47.7°, while the surface roughness increased to 99.5 nm. The water flux increased from 6.8 L/(m2•h) and 12.2 L/( m2•h) to 23.6 L/( m2•h) and 39.2 L/( m2•h) tested under the AL-FS mode (Active layer against the feed solution) and AL-DS mode (Active layer against the draw solution), respectively. And all the composite membranes have a relative high rejection to NaCl (R>90%).

第一作者简介：况武(1989.1-)，男，江西高安人，博士研究生，中国科学院大连化学物理研究所，从事膜技术研究．＊通讯作者，E-mail: ymcao@ dicp.ac.cn

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