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dc.contributor.advisorDeng, Baolineng
dc.contributor.authorZhou, Hangeng
dc.contributor.otherUniversity of Missouri-Columbia. Graduate School. Theses and Dissertations. Theses. 2013 Theseseng
dc.date.issued2013eng
dc.date.submitted2013 Summereng
dc.descriptionJuly 2013.eng
dc.descriptionA Thesis presented to the Faculty of the Graduate School at the University of Missouri--Columbia In Partial Fulfillment of the Requirements for the Degree Master of Science.eng
dc.descriptionThesis supervisor: Dr. Baolin Deng.eng
dc.description.abstractThis study was focused on the fabrication and application of titanium dioxide (TiO2)/polyacrylonitrile (PAN) nanofibers. TiO2/PAN nanofibers were prepared by the electrospinning process from the mixture of titanium isopropoxide (TIIP), PAN, acetone and dimethyl sulfoxide (DMSO). The catalytic performance of the PAN/TiO2 nanofibers on the reductive degradation of Cr(VI) under various condition was investigated. Solution pHs, light source and presence humic acid were studied as the main factors for the reaction. The photocatalytic reduction rates of Cr(VI) were significantly higher at the acidic condition than those at alkaline condition. The TiO2/PAN nanofibers could be activated by the visible light. At acid and neutral condition, the removal efficiency is nearly 100% under both UV and visible light exposure, which partially confirm that TiO2 anatase crystals had been doped to some degree with carbon or nitrogen from PAN in the annealing process. The presence of humic acid promoted the photocatalytic reduction of Cr(VI) by electrons. This trend could be result from the increased photocatalytic efficiency due to the reduced recombination between positive holes in the valence band and the electrons in the conduction band of the TiO2.eng
dc.description.bibrefIncludes bibliographical references.eng
dc.format.extent1 online resource (viii, 67 pages) : illustrations (chiefly color)eng
dc.identifier.oclc897817126eng
dc.identifier.urihttp://hdl.handle.net/10355/40220
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartof2013 Freely available theses (MU)eng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. Graduate School. Theses and Dissertationseng
dc.source.originalSubmitted by the University of Missouri--Columbia Graduate Schooleng
dc.subject.lcshTitanium dioxideeng
dc.subject.lcshElectrospinningeng
dc.subject.lcshChromium compounds -- Propertieseng
dc.subject.lcshChromium -- Toxicologyeng
dc.subject.lcshReduction (Chemistry)eng
dc.subject.lcshSulfurous acideng
dc.titlePhotocatalytic reduction of hexavalent chromium in aqueous solutions by TiO₂ PAN nanofiberseng
dc.typeThesiseng
thesis.degree.disciplineChemical engineering (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelMasterseng
thesis.degree.nameM.S.eng


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