Fabrication and characterization of polyamide thin film nanocomposite (TFN) nanofiltration membrane impregnated with TiO2 nanoparticles
Fabrication and characterization of polyamide thin film nanocomposite (TFN) nanofiltration membrane impregnated with TiO2 nanoparticles
复制标题
DOI：
10.1016/j.desal.2012.12.012
复制
发表时间：
2013-03-15
期刊：
影响因子：
9.9
通讯作者：
Liu, Shaomin
中科院分区：
文献类型：
--
作者：
Rajaeian, Babak;Rahimpour, Ahmad;Liu, Shaomin
通过界面掺入氨基硅烷化的纳米二氧化钛颗粒制备了一种新型的薄膜纳米复合纳滤膜。在多孔α-Al_2O_3陶瓷中空纤维膜上涂覆聚醚砜(PES)阻隔涂层作为基膜。在三甲氧基氯(TMC)有机相和间苯二胺(m-PDA)水相中分别以纯的和功能化的形式引入了纳米二氧化钛。用X射线衍射仪、傅里叶变换红外光谱和紫外-可见反射光谱分析证实了纳米二氧化钛的表面功能化。用扫描电子显微镜、能谱、原子力显微镜和接触角测角仪对所制备的复合膜的表面性能进行了研究。用热重分析(TGA)研究了聚酰胺层的耐热性。对膜的透过性、选择性和孔径测定等膜的内在性质也进行了阐述。含氨基官能团的硅烷偶联剂通过降低纳米粒子的表面能，增强了纳米粒子在聚酰胺表层内的良好分散性。在超低浓度(0.005%wt.%)下，功能化纳米二氧化钛膜的盐截留率提高到54%，水通量提高到123 L/m(2)h，加入较高浓度的纳米二氧化钛后，水通量提高了2倍，截留损失可以忽略不计。这些结果证明了使用功能化的无机纳米颗粒来提高产物通量和分离效率的能力。(C)2012爱思唯尔B.V.保留所有权利。
A novel thin-film nanocomposite (TFN) nanofiltration membrane has been developed via interfacial incorporation of aminosilanized TiO2 nanoparticles. Polyethersulfone (PES) barrier coating on a porous alpha-Al2O3 ceramic hollow fibre membrane was employed as the substrate layer. TiO2 nanoparticles were incorporated in pure and functionalized forms into trimesoyl chloride (TMC) organic phase and m-phenylenediamine (m-PDA) aqueous phase, respectively. The surface functionalization of TiO2 nanoparticle was confirmed by XRD, FTIR and UV-vis reflectance spectral analysis. Surface properties of the fabricated composite membranes were investigated using SEM, EDX, AFM and contact angle goniometry. Heat resistibility of polyamide layers were examined using thermogravimetric analysis (TGA). Membranes intrinsic properties such as: the permeability, selectivity and pore size determination were also elucidated. The silane coupling agent containing amino-functional groups reinforced TiO2 nano fillers for the good dispersion inside the polyamide skin layer by reducing their surface energy. At ultra-low concentration (0.005 wt.%), the functionalized TiO2 nanoparticles improved the salt rejection to 54% as well as water flux to 123 l/m(2) h. By incorporating a higher concentration of TiO2 nanoparticles, water flux was increased up to 2-fold compared with the pure polyamide membrane with negligible rejection loss. These results demonstrated competency of using functionalized inorganic nanoparticles to increase the product flux and the separation efficiency. (C) 2012 Elsevier B.V. All rights reserved.