Dielectric measurements of fouling of nanofiltration membranes by sparingly soluble salts
Dielectric measurements of fouling of nanofiltration membranes by sparingly soluble salts
复制标题
微溶盐对纳滤膜污染的介电测量
DOI：
10.1016/j.memsci.2015.09.042
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发表时间：
2016
影响因子：
9.5
通讯作者：
Tang Jiaoning
中科院分区：
文献类型：
--
作者：
Hao Weiliang;Yang Man;Zhao Kongshuang;Tang Jiaoning
测量了三种工业纳滤（NF）膜NF90、NF270和NF-在CaCO3、CaSO4、BaSO4、SrSO4污染前后的介电谱。通过介电谱监测不同膜孔径引起的污染过程和不同的污染模式。 NF270和NF-主要污染在膜孔内部，NF90污染在膜孔内部和膜表面，形成结垢层。通过分析介电参数对污染时间的依赖性，解释了不同膜系统的弛豫机制：对于膜NF270和NF-，在污染过程的初始阶段观察到的弛豫是界面极化（污染膜与去离子水之间）和浓差极化（膜表面附近）共同作用的结果，浓差极化是由不溶性盐（以下记为CP）形成的水垢解离而产生的，对于膜NF90来说，除了上述两种机制外，污垢层和去离子水之间的界面极化也有影响。 4 小时后的弛豫主要由污染膜和溶液界面之间的界面极化控制。进一步以CaSO4污染膜为例，通过在电路中引入恒相元件(CPE)进行介电分析，描述污染膜和结垢层。我们的发现表明膜孔径的大小会影响结垢过程。还讨论了介电谱作为非侵入性方法监测膜内部和表面污染过程的可行性。
The dielectric spectroscopy of three industrial nanofiltration (NF) membranes NF90, NF270 and NF-, before and after fouled by CaCO3, CaSO4, BaSO4, SrSO4, were measured. The fouling process and different fouling mode caused by the different membrane pore radius were monitored by dielectric spectroscopy. The NF270 and NF- were mainly fouled in the inner of the membrane pore and NF90 was fouled both in the inner of the membrane pore and on the membrane surface where a scaling layer formed. By analyzing the dependence of dielectric parameters on the fouling time, the relaxation mechanisms of different membrane systems were explained: for the membrane NF270 and NF-, the relaxation observed at the initial stage of fouling process was the result of cooperation of interfacial polarization (between the fouled membrane and deionized water) and the concentration polarization (near the membrane surface) which is from the dissociation of the scale formed by insoluble salts (denoted as CP hereafter), and for that of membrane NF90, in addition to the above two mechanisms, the interfacial polarization between fouling layer and deionized water also contributes. The relaxation after 4 h was mainly controlled by the interfacial polarization between the fouled membrane and solution interface. Further, taking the membrane fouled by CaSO4as an example, the dielectric analysis was carried out by introducing a constant-phase-element (CPE) to circuit to describe the fouled membrane and the scaling layer. Our finding indicates that the size of membrane pore would influence the fouling process. The feasibility of dielectric spectroscopy as a noninvasive method to monitor the fouling process of internal and surface of membrane was also discussed.
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影响因子：
2.9
作者：
P. Sow;D. Parvatalu;A. Bhardwaj;B. N. Prabhu;A. Bhaskarwar;A. Shukla
通讯作者：
P. Sow;D. Parvatalu;A. Bhardwaj;B. N. Prabhu;A. Bhaskarwar;A. Shukla
影响因子：
9.9
作者：
J. Kavanagh;S. Hussain;T. Chilcott;H. Coster
通讯作者：
J. Kavanagh;S. Hussain;T. Chilcott;H. Coster
影响因子：
9.5
作者：
Lianfa Song
通讯作者：
Lianfa Song
影响因子：
6.6
作者：
Jorcin, JB;Orazem, ME;Tribollet, B
通讯作者：
Tribollet, B
DOI：
10.1016/s0927-7757(01)00587-8
发表时间：
2001-09
期刊：
Colloids and Surfaces A: Physicochemical and Engineering Aspects
影响因子：
--
作者：
M. Ariza;A. Cañas;J. Benavente
通讯作者：
M. Ariza;A. Cañas;J. Benavente