High-Capacity and Rapid Removal of Refractory NOM Using Nanoscale Anion Exchange Resin
| Autor: | Emily E. Schmidt, James E. Amburgey, Jordan C. Poler, Billy R. Johnson, Amir Alansari, William M. Payne, Andy T. Nguyen, Tim B. Eldred |
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| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Materials science Aqueous solution Ion exchange Kinetics Portable water purification 02 engineering and technology Polymer 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Nanomaterials Adsorption chemistry Chemical engineering Organic chemistry General Materials Science 0210 nano-technology Ion-exchange resin 0105 earth and related environmental sciences |
| Zdroj: | ACS applied materialsinterfaces. 8(28) |
| ISSN: | 1944-8252 |
| Popis: | 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". |
| Databáze: | OpenAIRE |
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