![]() Were collected during calcination in air at 873 K with The Ti K-edge XANES of D-TiSGĪ1 is attributed mainly to the quadrupole tranet Of these peaks have been reported by Fargesĭeveloped software. The charwas controlled by the Eurotherm 2216e with the in-house The temperature of the sampleģ pre-edge peaks in XANES spectra. For cytalline TiO2, the octahedral structure of anatase Kapton windows were placed at either sides of the hole.įrom an incomplete TiO2 formation in the sol–gel proThe water cooling systems were installed to protect theĬess. Peak in D-TiSG might be due to the remaining of TTIP The results suggested formation of Ti–O clus50.8 mm long containing a K-type thermocouple are used Six cartridge heaters with 6.35 mm in outer diameter andĤ971 eV. Nificantly dropped with the developing of new peak at For theĭried TiSG, the intensity of pre-edge peak A” was sigof 1 mm horizontally and 2 mm vertically to pass through. Single intense pre-edge peak (A”) at 4969.5 eV. The tetragonal structure of TTIP reflected the In situ XANES setup at BL2.2: TRXAS, SLRI, Thailand. Their pre-edge peaks in the energy range fromĤ960 to 4980 eV were corresponding to the 1 s → 3dįigure 1. The normalized Ti K-edge XANES spectra of standardĪnatase TiO2, TTIP, D-TiSG and C-TiSG are shown inįigure 2(a). With TTIP can be described in terms of two classes of In Situ XANES Study of Amorphous-TiO2 Phase Transformation Hole was drilled through the cell allowing the X-ray sizesĪuthor to whom correspondence should be addressed. The cell is 40 ×ģ8 × 60 mm3 made from stainless steel. Phous and crystalline TiO2 also showed photocatalytic It has been reported that the mixture of amorin-house to meet the requirements of thermal treatment and Whereas crystalline anatase form prolongs the recombinaFor in situ XANES experiments, the cell was developed Solar cell, paint pigment and cosmetic.1–5 For TiO2 phowith Si(111) single crystal and the position sensitive detectocatalyst, the amorphous phase exhibits high surface area The photocatalyst such as environmental decontamination,Įmploys an energy dispersive monochromator equipped Light Research Institute (SLRI), Thailand. Used TiO2 in both amorphous and crystalline forms as Resolved XAS (Bonn-SUT-SLRI) beamline of Synchrotron XANES measurements were performed at the timeusing TiO2 have been reported. Several studies on the application of photocatalysis To produce crystalline TiO2 (C-TiSG), theĭ-TiSG was calcinated in air at 873 K for 1 hour. Recombination reaction which enhances their oxidizing and Was dried at 383 K (D-TiSG) before the in situ XANES On recombination between photogenerated electron andĪnd kept in an inert atmosphere for 24 hours. Was continuously stirred at room temperature for 15 min ![]() Was added to the mixture of 2-propanol and ethylene glycan be absorbed on catalyst with high surface area resultcol under magnetic stirring in a glove box. TiO2 (TiSG) was prepared by the sol–gel method. EXPERIMENTAL DETAILSįace area has an influence on the absorption possibility Mostly dependent on surface area and crystallinity. Tion of the prepared sample caused by the calcination.Įlectron/positively-charged hole pairs) which can oxidize Measurements were performed to monitor a phase transimovement of electrons forms e /h (negatively-charged In situ X-ray absorption near edge structure (XANES)Įnergy equal to or more than its energy gap. In order for photonium (IV) isopropoxide (TTIP) as an alkoxide precursor.Ĭatalysis to proceed, the semiconductor needs to absorb The TiO2 was prepared by the sol–gel method using titavalence and the conduction bands. Keywords: In Situ XANES, TiO2, Sol Gel, Phase Transformation.Īnd anatase TiO2 would be benefiNowadays, semiconductors areIP: Using phase fraction plot, TiO2 phase-transition canīe observed at temperatures between 748 and 778 K and remain unchanged at 873 K. Phase, the calcination at 843 K was necessary. Temperature, the results revealed the formation of an amorphous structure. Was prepared by a sol–gel method using titanium isopropoxide as a precursor. The in situ X-ray absorption near edge structure (XANES) measurement and linear combinationįitting were applied to monitor phase transformation of titanium dioxide. Synchrotron Light Research Institute, Nakhon Ratchasima, 30000, Thailandīiological Engineering Program, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, 10140, Thailand Yingyot Poo-Arporn1 ∗ and Rungtiva Palangsuntikul2 In Situ X-ray Absorption Near Edge Structure Study of Copyright © 2016 American Scientific Publishers
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