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Thesis
Development and scale-up of a hybrid carbon nanotube filter as a reactive substrate in ozone-based advanced oxidation processes
University of Iowa
Master of Science (MS), University of Iowa
Spring 2015
DOI: 10.17077/etd.005588
Abstract
This work has shown that the presence of carbon nanotubes (CNT) during ozonation promotes hydroxyl radical formation, resulting in a new advanced oxidation process (AOP) for removal of recalcitrant organic compounds in water systems. Building upon previous work demonstrating efficacy in batch systems, this study focused on the development of a CNT-enabled AOP in which CNT deposition on a membrane support in combination with an ozonated influent stream can couple chemical oxidation and filtration processes while preventing release of CNTs into the treated water supply. Tests have been conducted using a small volume bench-top system and an automated pilot-scale system that allowed the filters to be tested under continuous flow conditions more representative of field applications. This work demonstrated that a hybrid CNT filter is capable of achieving high levels of pollutant removal in a microfiltration system. But, further efforts must be made to counter the mobilization failure mechanism and improve the long term performance of the hybrid CNT filter. Pollutant removal has been shown to be a factor of the influent ozone concentration, the mass loading of CNTs deposited, as well as the chemical properties of the pollutant. This work has also demonstrated that there is an optimum multi-wall CNT diameter of 15 nm when functionalized to include high levels of surface oxygen. Further, longer (approximately 100 μm) MWCNTs improve the hydrodynamic properties of the hybrid filter. Efforts can now be made to maximize reactivity while accounting for necessary improvements in the engineered application of a hybrid CNT filter.
Details
- Title: Subtitle
- Development and scale-up of a hybrid carbon nanotube filter as a reactive substrate in ozone-based advanced oxidation processes
- Creators
- Jason Patrick Haase
- Contributors
- David M Cwiertny (Advisor)Richard L Valentine (Committee Member)Craig L Just (Committee Member)
- Resource Type
- Thesis
- Degree Awarded
- Master of Science (MS), University of Iowa
- Degree in
- Civil and Environmental Engineering
- Date degree season
- Spring 2015
- Publisher
- University of Iowa
- DOI
- 10.17077/etd.005588
- Number of pages
- ix, 93 pages
- Copyright
- Copyright 2015 Jason Haase
- Language
- English
- Description illustrations
- illustrations (some color), color maps
- Description bibliographic
- Includes bibliographical references (pages 91-93).
- Academic Unit
- Civil and Environmental Engineering
- Record Identifier
- 9983987999102771
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