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Enhanced Partitioning and Transport of Phenolic Micropollutants within Polyamide Composite Membranes

机译：聚酰胺复合膜中酚类微量污染物的增强分配和运输

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摘要

Aromatic phenols represent an important class of endocrine-disrupting and toxic pollutants, many of which (e.g., bisphenol A and substituted phenols) are known to be insufficiently removed by reverse osmosis (RO) and nanofiltration polyamide membranes that are widely used for water purification. In this study, the mechanism of phenol transport across the polyamide layer of RO membranes is studied using mode! phenolic compounds hydroquinone (HQ) and its oxidized counterpart benzoquinone (BQ). The study employs nitration experiments and two electrochemical techniques, impedance spectroscopy (EIS) and chronoamperometry (CA), to evaluate the permeability of an RO membrane SWCl to these solutes in the concentration range 0.1-10 mM. In addition, combination of the permeability data with EIS results allows separately estimating the average diffusivity and partitioning of BQand HQ. All methods produced permeability of the order 10~(-7) to 10~(-6)m s~(-1) that decreased with solute concentration, even though the permeability obtained from filtration was consistently lower. The decrease of permeability with concentration could be related to the nonlinear convex partitioning isotherm, in agreement with earlier measurements by FTIR. The diffusivity of HQ and BQ was estimated to be of the order 10~(-15) m~2 s~(-1) and partitioning coefficient of the order 10. The high affinity of phenols toward polyamide and their high uptake may change membrane characteristics at high concentration of the solute. EIS results and hydraulic permeability indeed showed that permeability to ions and water significantly decreases with increasing concentration of organic solute.
机译：芳香族酚类是一类重要的破坏内分泌的有毒污染物，已知其中许多（例如双酚A和取代的酚类）无法通过反渗透（RO）和被广泛用于水净化的纳滤聚酰胺膜充分去除。在这项研究中，使用模式研究了苯酚在RO膜的聚酰胺层上的迁移机理！酚类化合物对苯二酚（HQ）及其氧化对应的苯醌（BQ）。该研究采用硝化实验和两种电化学技术，即阻抗谱（EIS）和计时电流法（CA），以评估RO膜SWC1在0.1-10 mM浓度范围内对这些溶质的渗透性。此外，将渗透率数据与EIS结果结合起来可以分别估计BQ和HQ的平均扩散率和分区。即使通过过滤获得的渗透率始终较低，所有方法产生的渗透率都在10〜（-7）到10〜（-6）m s〜（-1）左右，并随溶质浓度的降低而降低。渗透率随浓度的降低可能与非线性凸分配等温线有关，这与FTIR的早期测量结果一致。 HQ和BQ的扩散率估计约为10〜（-15）m〜2 s〜（-1），分配系数约为10。酚对聚酰胺的高亲和力和其高吸收性可能会改变膜高浓度溶质时的特性。 EIS结果和水力渗透率确实表明，离子和水的渗透率会随着有机溶质浓度的增加而大大降低。

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  • 来源
    《Environmental Science & Technology》 |2012年第6期|p.3377-3383|共7页
  • 作者

    Emil Drazevic; Sarit Bason; Kresimir Kosutic; Viatcheslav Freger;

  • 作者单位

    Faculty of Chemical Engineering and Technology, University of Zagreb, Marulicev trg 19, 10000 Zagreb, Croatia;

    Zuckerbeg Institute for Water Research, Ben-Gurion University of the Negev, Sde-Boqer 84990, Israel;

    Faculty of Chemical Engineering and Technology, University of Zagreb, Marulicev trg 19, 10000 Zagreb, Croatia;

    The Wolfson Department of Chemical Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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