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The critical zeta potential of polymer membranes: how electrolytes impact membrane fouling

机译：聚合物膜的临界Zeta电位：电解质如何冲击膜污垢

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摘要

The zeta potential of membrane surfaces and the resulting electrostatic interactions are determining factors of membrane fouling. This study investigates the influence of environmental parameters like pH value, salt concentration, or ion valence on the zeta potential of polymer membranes and the resulting fouling. To control electrostatic forces charged polystyrene beads were used as fouling reagents. Also, polyethersulfone and polyvinylidene fluoride membranes were modified to possess an either positive or negative surface charge. Afterwards, suspensions of beads were filtered through the membranes in different electrolytic environments. Fouling occurred when membrane and beads are oppositely charged. Bead adsorption was not observed when both surfaces are evenly charged. The latter was found to be influenced by electrolyte concentration. High salt concentrations or present bivalent ions reduced the electrostatic repulsion between evenly charged surfaces and led to membrane fouling. Low salt concentrations did not influence the electrostatic repulsion. Thus, critical salt concentrations were determined and used to identify the critical zeta potential. In addition, the fouling of a zwitterionic membrane surface was investigated regarding its pH dependence. A critical zeta potential that is associated with membrane fouling was identified. The critical zeta potentials are similar for both pH and salt concentration dependence.
机译：膜表面的ζ电位和所得的静电相互作用是膜污垢的决定因素。本研究研究了环境参数对pH值，盐浓度或离子效价如聚合物膜的Zeta电位的影响和所得污垢。为了控制静电力，带电的聚苯乙烯珠子用作污垢试剂。此外，修饰聚醚砜和聚偏二氟乙烯膜以具有正面或阴性表面电荷。然后，通过不同电解环境中的膜过滤珠子的悬浮液。当膜和珠子相反充电时发生了污垢。当两个表面均匀充电时，未观察到珠子吸附。被发现后者受电解质浓度的影响。高盐浓度或具有本二价远离离子的静电浸润性降低均匀带电表面之间的静电排斥，并导致膜污垢。低盐浓度不会影响静电排斥。因此，确定临界盐浓度并用于鉴定临界Zeta电位。此外，研究了两性离子膜表面的污垢关于其pH依赖性。鉴定了与膜污染相关的关键Zeta电位。关键Zeta电位对于pH和盐浓度依赖性类似。

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  • 来源
    《RSC Advances》 |2016年第100期|共10页
  • 作者

    Breite D.; Went M.; Prager A.; Schulze A.;

  • 作者单位

    Leibniz Inst Surface Modificat Permoserstr 15 D-04318 Leipzig Germany;

    Leibniz Inst Surface Modificat Permoserstr 15 D-04318 Leipzig Germany;

    Leibniz Inst Surface Modificat Permoserstr 15 D-04318 Leipzig Germany;

    Leibniz Inst Surface Modificat Permoserstr 15 D-04318 Leipzig Germany;

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  • 正文语种 eng
  • 中图分类 化学;
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