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The role of cobalt oxide or magnesium oxide in ozonation of ammonia nitrogen in water
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| Title: | The role of cobalt oxide or magnesium oxide in ozonation of ammonia nitrogen in water |
| Authors: | Krisbiantoro, Philip Anggo Browse this author | | Togawa, Tomokazu Browse this author | | Mahardiani, Lina Browse this author | | Aihara, Haruka Browse this author | | Otomo, Ryoichi Browse this author →KAKEN DB | | Kamiya, Yuichi Browse this author →KAKEN DB |
| Keywords: | Ozonation | | Ammonia nitrogen | | Cobalt oxide | | Magnesium oxide | | Wastewater treatment |
| Issue Date: | 25-Apr-2020 |
| Publisher: | Elsevier |
| Journal Title: | Applied Catalysis A: General |
| Volume: | 596 |
| Start Page: | 117515 |
| Publisher DOI: | 10.1016/j.apcata.2020.117515 |
| Abstract: | In this study, the reaction mechanisms for ozonation of ammonia nitrogen in the presence of Co3O4 or MgO were investigated. For the reaction over Co3O4, Cl- in the reaction solution was indispensable and ClO- was formed by a non-catalytic oxidation of Cl-. Co3O4 promoted the reaction of NH4+ with ClO- to give the products including NO3-, chloramines and gaseous products. In contrast, Cl- was unnecessary for the reaction with MgO. pH of the reaction solution was maintained at around 9 throughout the reaction owing to partial dissolution of MgO. Ammonia nitrogen was decomposed to mainly NO3(-) by non-catalytic radical reaction involving OH center dot, which was formed by the reaction of OH- with O-3 in weakly basic solution. To keep the reaction solution weakly basic, H+ formed with the decomposition of NH4+ was neutralized. As a result, about the same amount of Mg2+ as that of decomposed ammonia nitrogen was dissolved. |
| 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/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/85022 |
| Appears in Collections: | 環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 神谷 裕一
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