Characterizing Macroporous Ion Exchange Membrane Adsorbers for Natural Organic Matter (NOM) Removal-Adsorption and Regeneration Behavior.

IF 3.3 4区工程技术 Q2 CHEMISTRY, PHYSICAL Membranes Pub Date : 2024-05-27 DOI:10.3390/membranes14060124

Jon Wullenweber, Julia Bennert, Tomi Mantel, Mathias Ernst

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Abstract

Addressing the characterization of Natural Organic Matter (NOM) removal by functionalized membranes in water treatment, this study evaluates the effectiveness of two commercial ion-exchange membrane adsorbers: Sartobind^® Q (with quaternary amines) and D (with tertiary amines). Using Suwannee River NOM (SRNOM) as a surrogate, Langmuir adsorption isotherms revealed maximum capacities (Q_max) of 2966 ± 153 mg C/m² and 2888 ± 112 mg C/m², respectively. Variations in flux from 50 to 500 LMH had a minimal impact on breakthrough times, proving low diffusion limitations. The macroporous (3-5 µm) functionalized cellulose-based membranes exhibited high permeabilities of 10,800 L/(h m² bar). Q maintained positive zeta potential vs. pH, while D's zeta potential decreased above pH 7 due to amine deprotonation and turning negative above an isoelectric point of 9.1. Regeneration with 0.01 M NaOH achieved over 95% DOC regeneration for Sartobind^® D, characterizing reversibility through a pH-swing. Cyclic adsorption showed that Q maintained its capacity with over 99% DOC regeneration, while D required acidic conditioning after the first regeneration cycle to mitigate capacity reduction and re-deprotonate the adsorber. These results have demonstrated the potential suitability of adsorber membranes, designed originally for biotechnological purposes, for the possible removal of disinfection byproduct precursors in drinking water treatment.

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用于去除天然有机物 (NOM) 的大孔离子交换膜吸附器的特性--吸附和再生行为。

针对功能化膜在水处理中去除天然有机物（NOM）的特性，本研究评估了两种商用离子交换膜吸附器的效果：Sartobind® Q（含季胺）和 D（含叔胺）。使用苏瓦尼河 NOM（SRNOM）作为替代物，Langmuir 吸附等温线显示最大吸附容量（Qmax）分别为 2966 ± 153 毫克 C/m2 和 2888 ± 112 毫克 C/m2。通量从 50 LMH 到 500 LMH 的变化对突破时间的影响微乎其微，证明扩散限制较低。大孔（3-5 µm）功能化纤维素基膜的渗透率高达 10,800 L/（h m2 bar）。Q 的 zeta 电位随 pH 值变化保持正值，而 D 的 zeta 电位在 pH 值 7 以上由于胺的去质子化而降低，在等电点 9.1 以上变为负值。用 0.01 M NaOH 进行再生可使 Sartobind® D 的 DOC 再生率达到 95% 以上，通过 pH 值的摆动表现出可逆性。循环吸附显示，Q 能保持 99% 以上的 DOC 再生能力，而 D 则需要在第一个再生循环后进行酸性调节，以减轻能力下降并使吸附器重新获得质子。这些结果表明，最初为生物技术目的而设计的吸附器膜可能适用于去除饮用水处理中的消毒副产物前体。

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来源期刊

Membranes Chemical Engineering-Filtration and Separation

CiteScore

6.10

自引率

16.70%

发文量

1071

审稿时长

11 weeks

期刊介绍： Membranes (ISSN 2077-0375) is an international, peer-reviewed open access journal of separation science and technology. It publishes reviews, research articles, communications and technical notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided.