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Manganese Oxide Structure and Transformation during Oxidation of Phenolic Contaminants
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| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | Manganese Oxide Structure and Transformation during Oxidation of Phenolic Contaminants. |
| 개인저자 | Balgooyen, Sarah Jane. |
| 단체저자명 | The University of Wisconsin - Madison. Civil & Environmental Engineering. |
| 발행사항 | [S.l.]: The University of Wisconsin - Madison., 2019. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2019. |
| 형태사항 | 174 p. |
| 기본자료 저록 | Dissertations Abstracts International 80-12B. Dissertation Abstract International |
| ISBN | 9781392287248 |
| 학위논문주기 | Thesis (Ph.D.)--The University of Wisconsin - Madison, 2019. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 80-12, Section: B.
Publisher info.: Dissertation/Thesis. Advisor: Ginder-Vogel, Matthew |
| 이용제한사항 | This item must not be sold to any third party vendors. |
| 요약 | Manganese(III/IV) oxides are strong oxidants found in a wide range of natural environments. These oxides are formed through microbial activity and control the environmental fate of many harmful contaminants. Manganese oxides are able to oxidize a wide variety of inorganic and organic species, including phenols. Phenolic contamination is an issue driven by anthropogenic inputs. For example, bisphenol A (BPA) is an industrial environmental contaminant found at concentrations that are considered harmful for aquatic life. The focus of previous research is the initial kinetics of model phenol oxidation. In this dissertation, we investigate the oxidation of environmental contaminants and the concurrent changes to the manganese oxide substrate. Since the rate of phenol oxidation decreases as the reaction proceeds, analysis of extensive reactions is an important part of this study.During twelve sequential additions of BPA to the same batch of 灌-MnO2, BPA oxidation rate decreases by three orders of magnitude. Additionally, the production of its predominant oxidation product, 4-hydroxycumyl alcohol (HCA) decreases from 40% to 3%. This is attributed to the accumulation of interlayer Mn(II/III) produced during the reaction. This use of multiple additions simulates the continuous introduction of BPA in near-surface environments or water treatment systems.In stirred flow reactors containing 灌-MnO2, higher influent BPA concentration (i.e., introduction rate) does not lead to higher production of polymeric products formed by radical coupling, including HCA. However, more extensive transformation of 灌-MnO2 is observed at lower introduction rates. This is attributed to the longer reaction times required to normalize the total amount of BPA reacting with 灌-MnO2 solids. Higher production of aqueous Mn(II) during longer reactions is due to the increased opportunity for disproportionation and comproportionation to occur.The oxidation of four target phenolic contaminants (i.e., BPA, triclosan, estrone, and p-cresol) show that interlayer cation species in birnessite (MnO2) determine its reactivity toward phenols. Synthetic birnessites that are pre-exchanged with Na+, K+, Mg2+, and Ca2+ react at different rates with the phenols. All four phenols follow the same trend where birnessite with Na+-interlayer reacts the fastest, then K+-interlayer, then Mg2+-interlayer, and finally Ca2+-interlayer. This is attributed to cations changing the overall oxidation state and altering the electron transfer rate. |
| 일반주제명 | Environmental science. Environmental engineering. |
| 언어 | 영어 |
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