Eco-friendly driven remediation of the indoor air environment: the synthesis of novel transition metal doped titania/silica aerogels for degradation of volatile and semi-volatile organic compounds

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dc.contributor.author Baker, Schuyler Denton
dc.date.accessioned 2012-01-24T14:13:49Z
dc.date.available 2012-01-24T14:13:49Z
dc.date.issued 2012-01-24
dc.identifier.uri http://hdl.handle.net/2097/13348
dc.description.abstract Remediation of the indoor environment led to the development of novel catalysts which can absorb light in the visible range. These catalysts were prepared using the wet chemistry method known as sol-gel chemistry because preparation via sol-gel provides a homogeneous gel formation, which can be treated via supercritical drying to produce an aerogel. These aerogels have been found to have high surface areas when a combination of titania/silica is used. The increase in surface area has been shown to enhance the activity of the catalysts. Mixed metal oxide systems were prepared using titanium isopropoxide and tetraethyl orthosilicate to yield a 1:1 system of titania/silica (TiO2/SiO2). These systems were doped during the initial synthesis with transition metals (Mn or Co) to create mixed metal oxide systems which absorb light in the visible light range. These materials were assessed for potential as heterogeneous catalysts via gas-solid phase reactions with acetaldehyde. Degradation of acetaldehyde as well as the formation of CO2 was monitored via gas chromatography-mass spectrometery. To increase the activity, visible light was introduced to the system. Experiments have shown that a 10 mol % manganese doped titania/silica system, in the presence of light, can degrade acetaldehyde. The cobalt doped counterpart showed dark activity in the presence of acetaldehyde resulting in the formation of CO2 without the addition of visible light. In the hope of increasing surface area a mixed solvent (toluene/methanol) synthesis procedure was applied to the manganese doped catalyst. The resulting materials were of a low surface area but showed a significant increase in degradation of acetaldehyde. Examination of the interactions between mixed metal oxide systems and semivolatile organic compounds (SVOCs) was studied. The pollutant, triphenyl phosphate, was dissolved in n-pentane and exposed to 10 mg of a given catalyst. These reactions were monitored using UVVis. All systems but the manganese doped titania/silica system resulted in the observation of no activity with triphenyl phosphate. The manganese doped catalyst shown a peculiar activity, the increase in absorbance of the triphenyl phosphate peaks as well as the formation of a new peak. en_US
dc.description.sponsorship Target of Excellence en_US
dc.language.iso en_US en_US
dc.publisher Kansas State University en
dc.subject Mixed metal oxides en_US
dc.subject Transition metal doped aerogels en_US
dc.title Eco-friendly driven remediation of the indoor air environment: the synthesis of novel transition metal doped titania/silica aerogels for degradation of volatile and semi-volatile organic compounds en_US
dc.type Thesis en_US
dc.description.degree Master of Science en_US
dc.description.level Masters en_US
dc.description.department Department of Chemistry en_US
dc.description.advisor Kenneth Klabunde en_US
dc.subject.umi Chemistry (0485) en_US
dc.subject.umi Environmental Sciences (0768) en_US
dc.subject.umi Materials Science (0794) en_US
dc.date.published 2012 en_US
dc.date.graduationmonth May en_US


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