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Author Matějová, Lenka ♦ Polách, Lukáš ♦ Lang, Jaroslav ♦ Šihor, Marcel ♦ Reli, Martin ♦ Brunátová, Tereza ♦ Daniš, Stanislav ♦ Peikertová, Pavlína ♦ Troppová, Ivana ♦ Kočí, Kamila
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ AZO DYES ♦ NITRIC OXIDE ♦ NITROUS OXIDE ♦ OXIDATION ♦ PROCESSING ♦ RAMAN SPECTRA ♦ SULFATES ♦ SURFACE AREA ♦ TITANIUM OXIDES ♦ X-RAY DIFFRACTION
Abstract Highlights: • A novel preparation approach of TiO{sub 2} anatase from titanyl sulphate by using pressurized water processing. • Processing temperature affects crucially the TiO{sub 2} anatase crystallization. • Correlation between Raman FWHMs and XRD determined anatase crystallites-size enabling the estimation of anatase crystallites-size from Raman spectra. • The anatase crystallite-size and surface area are determining properties in AO7 photo-discolorization. • The band gap structure and rate of recombination of electrons and holes are the determining properties in N{sub 2}O photodecomposition. - Abstract: TiO{sub 2} anatase was prepared by a novel preparation approach, combining utilization of titanyl sulphate as a precursor and pressurized water processing. In addition, two different chemical methods for preparation were used – thermal hydrolysis and induced hydrolysis. The photoactivity of developed TiO{sub 2} was examined in two environmentally-prospective reactions: azo-dye AO7 photodiscoloration (oxidation) and N{sub 2}O photodecomposition (reduction). It was revealed that during the processing the temperature has a crucial effect on TiO{sub 2} crystallization contrary to pressure. TiO{sub 2} anatase of smaller crystallite-size showed significantly higher photoactivity in AO7 photodiscoloration than TiO{sub 2} anatase of large crystallite-size. However, in N{sub 2}O photodecomposition all synthesized materials showed comparable activity. While the TiO{sub 2} anatase crystallite-size and surface area are the determining properties in azo-dye AO7 photodiscoloration, the electronic band structure and recombination rate of electron and holes are determining in N{sub 2}O photodecomposition. The correlation enabling the estimation of TiO{sub 2} anatase crystallite-size from Raman FWHMs was found as well.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 2017-11-15
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 95


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