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Effects of Pre, Post, and Simultaneous Loading of Natural Organic Matter on 2-Methylisoborneol Adsorption on Superfine Powdered Activated Carbon : Reversibility and External Pore-blocking
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| Title: | Effects of Pre, Post, and Simultaneous Loading of Natural Organic Matter on 2-Methylisoborneol Adsorption on Superfine Powdered Activated Carbon : Reversibility and External Pore-blocking |
| Authors: | Nakayama, Akiko Browse this author | | Sakamoto, Asuka Browse this author | | Matsushita, Taku Browse this author →KAKEN DB | | Matsui, Yoshihiko Browse this author →KAKEN DB | | Shirasaki, Nobutaka Browse this author →KAKEN DB |
| Keywords: | PAC | | particle size | | sub-micrometer | | competitive adsorption | | humic substance | | taste and odor |
| Issue Date: | 1-Sep-2020 |
| Publisher: | Elsevier |
| Journal Title: | Water Research |
| Volume: | 182 |
| Start Page: | 115992 |
| Publisher DOI: | 10.1016/j.watres.2020.115992 |
| Abstract: | Three different natural organic matter (NOM)-loading methods were compared for the adsorptive removal of 2-methylisoborneol (MIB) by superfine powdered activated carbon (SPAC) and conventionally-sized powdered activated carbon (PAC). The three NOM-loading methods were: NOM adsorption followed by MIB (MIB adsorption on NOM-preloaded carbon), MIB adsorption followed by NOM (MIB adsorption on NOM post-loaded carbon), and simultaneous NOM and MIB loading (MIB adsorption on NOM-simultaneously loaded carbon). MIB removals were similar for the smaller-sized carbon (SPAC) at higher AC dosages and at lower initial NOM concentrations. The similar MIB removals indicate direct site competition between MIB and NOM with MIB adsorption reversibility (complete desorption of MIB by NOM). At lower AC doses, especially for PACs, and at higher initial NOM concentrations, the adsorption of MIBs depended on the sequence of MIB or NOM adsorption. MIB removal was lowest for the NOM-preloaded carbon, followed by NOM-simultaneously loaded carbon. The highest MIB removal was achieved by post-loading of NOM, indicating that the adsorption is irreversible. MIB adsorption on SPAC was more reversible than on PAC, although the pore size distributions of the two carbons were similar. The high degree of adsorption irreversibility for PAC compared with SPAC indicated that pore blocking occurs due to NOM loading at the PAC particle surface. Images of the external adsorption were obtained using isotope mapping and N-labeled effluent organic matter. |
| Rights: | ©2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/86645 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 松井 佳彦
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