Electrokinetic effects in membrane pores and the determination of zeta-potential

被引:70
作者
Bowen, WR [1 ]
Cao, XW [1 ]
机构
[1] Univ Coll Swansea, Dept Chem & Biol Proc Engn, Ctr Complex Fluids Proc, Biochem Engn Grp, Swansea SA2 8PP, W Glam, Wales
基金
英国工程与自然科学研究理事会;
关键词
electroosmosis; microfiltration; nanofiltration; streaming potential; ultrafiltration; zeta-potential;
D O I
10.1016/S0376-7388(97)00278-0
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The surface charge or electrical potential properties of microfiltration, ultrafiltration and nanofiltration membranes can have a very significant influence on their separation performance. Such properties are most commonly quantified in terms of zeta-potentials obtained by calculation following experimental measurement of streaming potentials. Such calculation requires numerical solution of the equations governing fluid flow and electrical-potential distribution in the pores. A method for such calculations is presented, which includes a numerical solution of the non-linear Poisson-Boltzmann equation and allows for the mobilities of anions and cations to be individually specified. By expressing the results of such calculations in terms of a factor to be applied to a classical analytical result, it is shown to be very important to use proper numerical calculations in the interpretation of electrokinetic data for membranes. Use of a classical analytical analysis to calculate 'relative', 'apparent', 'equivalent' or 'nominal' zeta-potentials is likely to lead to substantial underestimation of the true zeta-potential and possible serious error even in the interpretation of relative changes in membrane properties. The calculations needed to avoid such difficulties may be readily carried out on a PC. It is also important to account for the individual mobilities of the anions and cations in the electrolyte used for measurements. (C) 1998 Elsevier Science B.V.
引用
收藏
页码:267 / 273
页数:7
相关论文
共 20 条
[1]   Electrokinetic phenomena in microporous membranes with a fixed transverse charge distribution [J].
Aguilella, V ;
AguileliaArzo, M ;
Ramirez, P .
JOURNAL OF MEMBRANE SCIENCE, 1996, 113 (02) :191-204
[2]   ELECTROKINETIC PARAMETERS FOR CAPILLARIES OF DIFFERENT GEOMETRIES [J].
ANDERSON, JL ;
KOH, WH .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1977, 59 (01) :149-158
[3]   PROPER AND ADSORBED CHARGES ON THE SURFACES OF THE POLYSULFONIC SUPPORT OF A COMPOSITE MEMBRANE FROM ELECTROKINETIC PHENOMENA [J].
BENAVENTE, J ;
HERNANDEZ, A ;
JONSSON, G .
JOURNAL OF MEMBRANE SCIENCE, 1993, 80 (1-3) :285-296
[4]   The hydrodynamic and electrostatic interactions on the approach and entry of a charged spherical particle to a charged cylindrical pore in a charged planar surface with implications for membrane separation processes [J].
Bowen, WR ;
Sharif, AO .
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1996, 452 (1952) :2121-2140
[5]   PROPERTIES OF MICROFILTRATION MEMBRANES - THE SURFACE ELECTROCHEMISTRY OF ANODIC FILM MEMBRANES [J].
BOWEN, WR ;
HUGHES, DT .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1991, 143 (01) :252-265
[6]   ELECTROVISCOUS EFFECTS IN CHARGED CAPILLARIES [J].
BOWEN, WR ;
JENNER, F .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1995, 173 (02) :388-395
[7]   Charge adsorption and zeta potential in cyclopore membranes [J].
Calvo, JI ;
Hernandez, A ;
Pradanos, P ;
Tejerina, F .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1996, 181 (02) :399-412
[8]   STUDY OF STREAMING POTENTIALS OF CLEAN AND FOULED ULTRAFILTRATION MEMBRANES [J].
CAUSSERAND, C ;
NYSTROM, M ;
AIMAR, P .
JOURNAL OF MEMBRANE SCIENCE, 1994, 88 (2-3) :211-222
[9]   MEASURING THE ZETA (ELECTROKINETIC) POTENTIAL OF REVERSE-OSMOSIS MEMBRANES BY A STREAMING POTENTIAL ANALYZER [J].
ELIMELECH, M ;
CHEN, WH ;
WAYPA, JJ .
DESALINATION, 1994, 95 (03) :269-286
[10]   POROUS STRUCTURE AND SURFACE-CHARGE DENSITY ON THE WALLS OF MICROPOROUS ALUMINA MEMBRANES [J].
HERNANDEZ, A ;
MARTINEZ, F ;
MARTIN, A ;
PRADANOS, P .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1995, 173 (02) :284-296