High-Capacity and Rapid Removal of Refractory NOM Using Nanoscale Anion Exchange Resin.
High-Capacity and Rapid Removal of Refractory NOM Using Nanoscale Anion Exchange Resin.
复制标题
使用纳米级阴离子交换树脂高容量快速去除难降解的 NOM。
DOI：
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发表时间：
2016
影响因子：
9.5
通讯作者：
J. C. Poler
中科院分区：
文献类型：
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作者：
B. R. Johnson;Tim B. Eldred;Andy T. Nguyen;William M Payne;Emily E. Schmidt;Amir Alansari;James Amburgey;J. C. Poler
随着人类对饮用水中消毒副产物（DBP）的健康关注增加，因此需要开发快速且高容量地去除它们的新材料。离子交换（IEX）是去除天然有机物（NOM）的有效方法，特别是具有季铵官能团的阴离子交换树脂（AER）。然而，在现有的商业树脂材料中，容量是有限的，因为吸附物只能与最外表面区域相互作用，这使得这些产品在质量基础上效率低下。我们已经合成了一种新型的“NanoResin”，其利用了季铵树脂的增强NOM去除，同时利用了作为树脂支架的SWCNT的巨大表面积。与市售吸附剂相比，我们的纳米材料在一小部分时间内显示出更高的吸附能力。该NanoResin仅需要约10秒即可达到离子交换平衡。相比之下，商业AERs仅实现部分去除后，超过30分钟。高容量吸附的低分子量（MW）的替代品已被测量。NOM去除在具有低和高比UV吸光度（苏瓦）组合物的溶液中与这些纳米材料一起被证明。此外，NanoResin显示出对取自南卡罗来纳州默特尔海滩的NOM浓缩物样品的增强去除，证明NanoResin是在天然水性环境中去除难降解NOM的有效方法。聚合物和纳米材料的合成和表征如下所示。吸附容量，吸附动力学，再生和可重复使用的NOM去除这些新材料进行了说明。开放基质微结构排除了吸附物的任何颗粒内扩散;因此，这些纳米材料充当“接触树脂”。
As human health concerns over disinfection byproducts (DBP) in drinking water increase, so does the need to develop new materials that remove them rapidly and at high capacity. Ion exchange (IEX) is an effective method for the removal of natural organic matter (NOM), especially anion exchange resins (AERs) with quaternary ammonium functional groups. However, capacity is limited in existing commercial resin materials because adsorbates can only interact with the outermost surface area, which makes these products inefficient on a mass basis. We have synthesized a novel "NanoResin" exploiting the enhanced NOM removal of the quaternary ammonium resin while utilizing the vast surface area of SWCNTs, which act as scaffolding for the resin. Our nanomaterials show increased adsorption capacity compared to commercially available adsorbents, in a fraction of the time. This NanoResin requires only about 10 s to reach ion-exchange equilibrium. Comparatively, commercial AERs only achieved partial removal after more than 30 min. High capacity adsorption of a low molecular weight (MW) surrogate has been measured. NOM removal was demonstrated in solutions of both low and high specific UV absorbance (SUVA) composition with these nanomaterials. Additionally, the NanoResin showed enhanced removal of a NOM concentrate sample taken from Myrtle Beach, SC, demonstrating NanoResin is an effective method of removal for refractory NOM in a natural aqueous environment. Synthesis and characterization of the polymers and nanomaterials are presented below. Adsorption capacity, adsorption kinetics, and the regeneration and reusability of these new materials for NOM removal are described. The open matrix microstructure precludes any intraparticle diffusion of adsorbates; thus, these nanomaterials act as a "contact resin".