Thesis (Ph.D.)--Hong Kong University of Science and Technology, 2009. / Includes bibliographical references (p. 141-154).

Thesis (M.S.)--Villanova University, 2009. / Chemistry Dept. Includes bibliographical references.

Thesis (Ph. D.)--University of Washington, 1999. / Vita. Includes bibliographical references (leaves 123-130).

Thesis--Chalmers Tekniska Högskola, Göteborg. / Includes bibliographical references.

Thesis (Ph. D.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2006. / Dr. Spyros Pavlostathis, Committee Member ; Dr. Mustafa M. Aral, Committee Chair ; Dr. Turgay Uzer, Committee Member ; Dr. Ching-Hua Huang, Committee Member ; Dr. Sotira Yiacoumi, Committee Member. Vita. Includes bibliographical references.

Thesis (M.S.) in Civil Engineering--University of Maine, 2006. / Includes vita. Includes bibliographical references (leaves 84-87).

No description available.

Ph.D.

Thesis (Ph. D.)--University of Missouri-Columbia, 1999. / Typescript. Vita. Includes bibliographical references (leaves 154-159). Also available on the Internet.

Made available in DSpace on 2014-06-11T19:35:07Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-05-26Bitstream added on 2014-06-13T18:46:19Z : No. of bitstreams: 1 araujo_ab_dr_araiq.pdf: 1779379 bytes, checksum: 50326f1d473f7e1c075f9321705d0377 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / O presente trabalho descreve a utilização de filmes de TiO2 e TiO2 modificados com prata, preparados pelo método sol-gel, na fotodegradação de fenol e fluidos de corte. Os filmes foram imobilizados em substratos de vidro pela técnica de dip-coating e caracterizados por espectrofotometria no UV-Vis, difração de raios-X, microscopia eletrônica de varredura (MEV) e microscopia eletrônica de varredura de alta resolução (FEG-MEV). Dentre os filmes de TiO2, o que apresentou maior atividade foi o filme denominado TiO2 misto 24 h, que degradou em torno de 65% (pH= 5,0) dos poluentes orgânicos estudados. O filme modificado apresentou um aumento de cerca de 20% na degradação dos mesmos poluentes quando comparado ao filme de TiO2 misto 24 h. Também foi estudada a fotodegradação de fluidos de corte empregando o TiO2 P 25 em função do pH das amostras. A maior porcentagem de degradação, foi obtida em pH= 8,0 para todos os fluidos estudados. / The present work describes the use of immobilized films of TiO2 and TiO2 modified with silver, prepared by the sol-gel method, in the photodegradation of phenol and cutting fluids. TiO2 films had been immobilized in glass substrate by the dip-coating technique and characterized by UV-visible spectroscopy, X-ray diffraction, scanning electron microscopy (SEM) and field emission gun - scanning electron microscopy (FEG-SEM). Among the TiO2 films, what presented greater activity was the one called film mixing TiO2 24 h, which degraded around 65% (pH= 5,0) of the studied organic pollutants. The modified film presented an increase of about 20% in the photodegradation of the same pollutants when compared to the film mixing TiO2 24 h. The fotodegradation of cut fluid using TiO2 P 25 as a function of pH of the samples was also studied. The greater percentage of photodegradation, was gotten in pH= 8,0 for all studied fluids.