膜科学与技术

位置：首页 >> 期刊内容阅读

PVDF/SiO2超滤膜抗污染特性的微观作用力分析

作者：王欣¹，王磊¹，黄丹曦¹，孟晓荣¹，王磊¹，陈立成²，王旭东¹

单位： 1西安建筑科技大学环境与市政工程学院，陕西西安 710055；2西安工程大学环境与化学工程学院，陕西西安 710048

关键词： TU991.24

DOI号：

分类号： PVDF超滤膜；纳米SiO2；AFM；亲水性；膜污染

出版年,卷(期):页码： 2014,34(5):73-78

摘要：

以无机纳米粒子（SiO2）与PVDF共混，使用相转化法制得无机-有机平板超滤膜。考察了SiO2含量在1%-3%范围内对PVDF超滤膜的接触角、膜平均孔径及渗透性能的影响。以BSA为标准污染物，宏观过滤实验评价了SiO2改性对PVDF超滤膜的抗污染行为。通过探针修饰，以原子力显微镜（AFM）检测技术定量分析了膜污染过程中膜面与污染物相互间的微观作用力。结果表明，添加SiO2能有效改善PVDF超滤膜的亲水性能，影响膜平均孔径和渗透性能。SiO2含量为1%的改性超滤膜（P1膜）孔径最大，接触角最小且渗透性能最佳，膜表面和断面微观结构的SEM表征结果也进一步证实了上述结论。膜污染评价结果显示，在BSA过滤过程中，P1膜通量衰减速度慢、清洗恢复率高，抗污染性能较好。AFM数据显示，膜面与BSA间的粘附力随膜的亲水性增大而下降，并随着污染物在膜表面的累积程度逐渐下降。初步说明膜与BSA间的微观作用力是导致膜污染发生的主要原因，SiO2的添加能够有效降低膜的初期污染进而提高膜抗污染性能。

Organic-inorganic plate ultrafiltration membranes were prepared via phase inversion method through blending SiO2 nanoparticles with PVDF. The effects of SiO2 concentration from 1% to 3% on the contact angle, average pore size and permeability of membranes were investigated. The anti-fouling behavior of PVDF/SiO2 membranes was evaluated by macro filtration experiment with BSA as standard foulant. In addition, the micro-forces of membrane-BSA foulant in the fouling process were investigated by atomic force microscope (AFM) in conjunction with self-made foulant-coated colloidal probe. Results revealed that the flux, average pore size and hydrophilicity of the membranes were improved effectively by the additive of SiO2. The performance was optimum when the adding amount of SiO2 was 1%. The above-mentioned conclusions were confirmed by the SEM images of surface and cross-section microstructure. The results of membrane fouling evaluation showed that, for P1 membrane, the flux decline rate was decreased slowly, and the flux recovery rate was improved. Meanwhile, anti-fouling performance was better. The AFM data indicated that the adhesive forces of membranes-BSA foulant were decreased with the hydrophilicity of modified membranes increased, and became smaller as BSA foulant accumulated gradually in the surface of membranes. It illustrated preliminarily that interactions of membranes and BSA foulant was the main reason of membrane fouling. That is, membrane fouling in the initial filtration stage was reduced by the additive of SiO2, which lead to improve the anti-fouling properties of PVDF ultrafiltration membranes.

基金项目：

作者简介：

参考文献：

[1] 负延滨，刘丽英，马润宇．聚偏氟乙烯膜的研究进展[J]．膜科学与技术，2003，23(2)：57-61．
[2] 顾明浩，张军，王晓琳．聚偏氟乙烯微孔膜制备方法研究进展[J]．工业水处理，2006，26(2)：5-9．
[3] 叶海，芦艳，杨佳等．复合无机纳米颗粒改性有机超滤膜的制备及其性能研究[J]．水处理技术，2011，37(7)：9-11．
[4] A. Bottino, G. Capannelli, V. D'Asti, P. Piaggio. Preparation and properties of novel organic-inorganic porous membranes [J]. Separation and Purification Technology, 22–23 (2001): 269-275.
[5] L.-Y. Yu, Z.-L. Xu, H.-M. Shen, H. Yang. Preparation and characterization of PVDF-SiO2 composite hollow fiber UF membrane by sol-gel method [J]. Journal of Membrane Science, 337 (2009): 257-265.
[6] X. Zuo, S. Yu, X. Xu, J. Xu, R. Bao, X. Yan. New PVDF organic-inorganic membranes: The effect of SiO2 nanoparticles content on the transport performance of anion-exchange membranes [J]. Journal of Membrane Science, 340 (2009): 206-213.
[7] C. Liao, J. Zhao, P. Yu, H. Tong, Y. Luo. Synthesis and characterization of low content of different SiO2 materials composite poly (vinylidene fluoride) ultrafiltration membranes [J]. Desalination, 285 (2012): 117-122.
[8] G.Arthalzareeswaran, T.K.Sriyamuna Devi, M.Raajenthiren. Effeet of silica particles on cellulose acetate blend ultrafiltration membranes: part l [J]. Separation and Purification Technology, 2008, 64:38-47.
[9] Bowen, W. R.; Doneva, T. A.; Stoton, J. A. G.. Protein deposition during cross-flow membrane filtration: AFM studies and flux loss [J]. Colloids and Surfaces B: Biointerfaces, 2002, 27, 103-113.
[10] Bowen, W. R.; Hilal, N.; Lovitt, R. W.; Wright, C. J. A new technique for membrane characterisation: Direct measurement of the force of adhesion of a single particle using an atomic force microscope [J]. Journal of Membrane Science. 1998, 139, 269-274.
[11] Bowen, W. R.; Hilal, N.; Lovitt, R. W; Wright, C. J. Characterization of membrane surfaces: Direct measurement of biological adhesion using an atomic force microscope [J]. Journal of Membrane Science, 1999, 154, 205-212.
[12] Ang, W. S.; Elimelech, M. Protein (BSA) fouling of reverse osmosis membranes: Implications for wastewater reclamation [J]. Journal of Membrane Science.2007, 296, 83-92.
[13] Gan, Y.; Franks, G. V. Cleaning AFM colloidal probes by mechanically scrubbing with supersharp“brushes’ [J]. Ultramicroscopy 2009, 109, 1061-1065.
[14] Zhang W., Stack A.G., Chen Y. Interaction force measurement between E.coli cells and nanoparticles immobilized surfaces by using AFM [J]. Colloids and Surfaces B: Biointerfaces, 2011, 82, 316-324.
[15] Li, Q.; Elimelech, M. Organic fouling and chemical cleaning of nanofiltration membranes: Measurements and mechanisms [J]. Environment Science and Technology, 2004, 38, 468-4693.
[16] 白娟莉，王磊，孟晓荣等．亲水化改性PVDF超滤膜的抗污染特性研究[J]．水处理技术，2011，37(8)：44-47．
[17] Feng C S, Shi B L, Wu Y L, et al. Preparation and properties of microporous membrane from poly(vinylidene fluoride-co-tetrafluoroethylene) (F2.4) for membrane distillation[J]. Journal of Membrane Science, 2004, 237:15-24.
[18] 王磊，王旭东，刘莹等．臭氧预氧化对城市二级处理水中残留有机物分子量分布的影响及超滤膜阻力变化分析[J]．膜科学与技术，2006，26(2)：27-30．
[19] Lei Wang, Rui Miao, Xudong Wang et al. Fouling behavior of typical organic foulants in Polyvinylidene fluoride ultrafiltration membranes: characterization from micro forces [J]. Environment Science and Technology, 2013, 157-198.
[20] Nghiem L D，Hawkes S．Effects of membrane fouling on the nanofiltration of pharmaceutically active compounds(PhACs)：Mechanisms and role of membrane pore size [J]. Separation and Purification Technology, 2007, 57: 176-184．
[21] Hashino, M.; Hirami, K.; Ishigami, T.; Ohmukai, Y.; Maruyama, T.; Kubota, N.; Matsuyama, H. Effect of kinds of membrane materials on membrane fouling with BSA [J]. Journal of Membrane Science, 2011, 384, 157-165.
[22] I.H. Huisman. P. Prádanos. A. Hernández. The effect of protein - protein and protein -membrane interactions on membrane fouling in ultrafiltration [J], Journal of Membrane Science, 179 (2000) 79.

服务与反馈：

【文章下载】【加入收藏】

《膜科学与技术》编辑部地址：北京市朝阳区北三环东路19号蓝星大厦邮政编码：100029 电话：010-64426130/64433466 传真：010-80485372邮箱：mkxyjs@163.com