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![Potassium Permanganate Embedded in Pellets of Polyvinyl Acetate (PVAc) or Polyethylene Oxide (PEO) for In-Situ Controlled Release of Chemical Oxidants in Water için kapak resmi Potassium Permanganate Embedded in Pellets of Polyvinyl Acetate (PVAc) or Polyethylene Oxide (PEO) for In-Situ Controlled Release of Chemical Oxidants in Water için kapak resmi](/client/assets/d79c3e4af2b6d196/ctx/images/no_image.png)
Potassium Permanganate Embedded in Pellets of Polyvinyl Acetate (PVAc) or Polyethylene Oxide (PEO) for In-Situ Controlled Release of Chemical Oxidants in Water
Başlık:
Potassium Permanganate Embedded in Pellets of Polyvinyl Acetate (PVAc) or Polyethylene Oxide (PEO) for In-Situ Controlled Release of Chemical Oxidants in Water
Yazar:
Doan, Yen Thi, author.
ISBN:
9780355981988
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (76 pages)
Genel Not:
Source: Masters Abstracts International, Volume: 57-06M(E).
Advisors: Stephanie L. Luster-Teasley Committee members: Manoj K. Jha; Miguel Picornell; Nafisa H. Sirelkhatim.
Özet:
In-Situ Chemical Oxidation (ISCO) is an environmental remediation method where strong oxidation/reduction liquids and gasses are used to react with environmental contaminants to reduce them to less toxic chemicals. However, traditional chemox treatments are severely limited by uncontrollable reactions, concerns for transport, storage, and worker safety related to handling highly reactive chemicals. The uncontrolled high reactivity leads to short lifetimes and the need to continuously re-apply high doses for days, weeks or even years until the target contaminant is removed. For the first phase of the research, solid phase (pellets) were prepared by encapsulating potassium permanganate (oxidant) in an inert polymer to prevent exposure of the oxidant prior to release in the environment. For the first phase, a comparison of pellets formed with the oxidant and the polyvinyl ethylene oxide polymer (oxidant-PEO) and the oxidant with polyvinyl acetate polymer (oxidant-PVAc) containing 20%, 40% and 60% oxidant by mass. To complete the formation of the pellets, they were baked at different temperatures and baking times with a goal to assess the effects baking would have on oxidant release from the polymer. From the research, it was observed that the oxidant-PEO pellets can slow the release of the oxidant from the pellet; however, MnO2 precipitates were observed. Formation of MnO2 precipitates is not desirable for chemical remediation because the precipitates could plug the groundwater remediation zone, hence reducing the potential for effective remediation. In the second phase of the work, the oxidant-PVAc pellets proved to demonstrate controlled release that increased with time and no MnO2 precipitates observed after 3 days of release in the experiments. The oxidant-PVAc pellets resulted in the better candidate for the development of a controlled release pellet system. Therefore, the oxidant-PVAc was used in the remaining experiments. At 120 ºC baking temperature and 2 minutes for these pellets, they released 77.61±2.54% of the oxidant in the 20%, pellets 80.83±0.3% of the oxidant for the 40% pellets and 86.31±2.8 % of the oxidant for 60% pellets. For the total release, the 20%, 40%, and 60 % oxidant-PVAc pellets demonstrated the slowest release at 140 ºC for 10 minutes baked. The releases were 44.39±1.28% for 20 % pellets, 78.92±1.44 for 40% pellets, and 82.60±4.11 % for 60% pellets.
Notlar:
School code: 1544
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(688766.1) | 688766-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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