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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
Type: article (author version)
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)

Submitter: 神谷 裕一

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