Preparation and characterization of $TiO_2$-base mixed oxide photocatalysts = 티타니아를 기반으로 하는 혼합광촉매의 제조와 특성

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 332
  • Download : 0
DC FieldValueLanguage
dc.contributor.advisorLee, Huen-
dc.contributor.advisorLee, Tai-Kyu-
dc.contributor.advisor이흔-
dc.contributor.advisor이태규-
dc.contributor.authorJeon, Myung-Seok-
dc.contributor.author전명석-
dc.date.accessioned2011-12-13T01:35:14Z-
dc.date.available2011-12-13T01:35:14Z-
dc.date.issued2001-
dc.identifier.urihttp://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=165721&flag=dissertation-
dc.identifier.urihttp://hdl.handle.net/10203/28856-
dc.description학위논문(박사) - 한국과학기술원 : 화학공학과, 2001.2, [ x, 109 p. ]-
dc.description.abstractThis study was focused on the photocatalytic wastewater treatment technology, especially on the heterogeneous photocatalyst systems which use $TiO_2-based$ mixed oxides as a photocatalyst. The enhancement of the photocatalytic activity of $TiO_2$ was investigated as a function of added amount of other oxides to promote desired redox reaction. This thesis included the preparation and characterization of $TiO_2$ base mixed oxide photocatalysts. By introducing a metal-ion, modified redox energy level in the energy band gap can play a role to retard recombination rate by trapping some of charge carrier and to enhance interfacial charge transfer. The mixed oxides of $Nb_2O_5$ or $Li_2O$ with $TiO_2$ prepared by a sol-gel process. While the $Nb_2O_5$/$TiO_2$ had a deleterious effect on the oxidation rate of DCA, the excess electrons due to the doping of $Nb_2O_5$ into $TiO_2$ promoted the reduction process for $Cr^{6+}$. $Li_2O$ (1wt%) with $TiO_2$ was found the most efficient photocatalyst for the DCA oxidation, resulting in photocatalytic activity of 50%. Preparation and characterization of a nano-sized Mo/Ti and Fe/Ti mixed oxide photocatalysts were performed. Nano-sized molybdenum-doped $TiO_2$ (Mo/Ti) mixed oxide photocatalyst was prepared with the $Mo{5+}$ content varying from 0 up to 2.5 mol. TEM-electron diffraction and X-ray diffraction patterns showed that particles were in the form of anatase with the diameter of ca. 4 nm. The appreciable red shift in the UV/VIS absorption spectra was monitored at each preparation stage-aging and dialyzing. The red-shift varied with addition of Mo, in the case of 2.5% Mo/Ti the UV/VIS absorption started at around 0.22 eV less than in nano-sized pure $TiO_2$ (about 3.42 eV). EDAX verified that the amount of Mo in the prepared mixed oxides was as required, and XPS analysis revealed that Mo(V) existed in the $TiO_2$ lattice. The measured photonic efficiency increased to 0.28 with DCA at 0.5 mol% Mo, and then decreased as...eng
dc.languageeng-
dc.publisher한국과학기술원-
dc.subjectphotocatalytic reaction-
dc.subjectdoped-
dc.subject광촉매-
dc.subject티타니아-
dc.subject광촉매반응-
dc.subject도핑-
dc.subjectphotocatalyst-
dc.subjecttitania-
dc.titlePreparation and characterization of $TiO_2$-base mixed oxide photocatalysts = 티타니아를 기반으로 하는 혼합광촉매의 제조와 특성-
dc.typeThesis(Ph.D)-
dc.identifier.CNRN165721/325007-
dc.description.department한국과학기술원 : 화학공학과, -
dc.identifier.uid000925574-
dc.contributor.localauthorLee, Huen-
dc.contributor.localauthorLee, Tai-Kyu-
dc.contributor.localauthor이흔-
dc.contributor.localauthor이태규-
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
Files in This Item
There are no files associated with this item.

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0