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Photocatalytic reduction of carbon dioxide over Cu/TiO2 photocatalysts
Authors: Tasbihi Minoo | Koci Kamila | Troppova Ivana | Edelmannova Miroslava | Reli Martin | Čapek Libor | Schomaecker Reinhard
Year: 2018
Type of publication: článek v odborném periodiku
Name of source: Environmental Science and Pollution Research
Publisher name: Springer
Place: Heidelberg
Page from-to: 34903-34911
Titles:
Language Name Abstract Keywords
cze Fotokatalytická redukce oxidu uhličitého na Cu/TiO2 fotokatalyzátorech Fotokatalytická redukce CO2 s vodou pomocí Cu/TiO2 fotokatalyzátorů ve vodném roztoku byla zkoumána. Pro tento cíl byly metodou sol-gel připraveny fotokatalyzátory Cu/TiO2 s obsahem 0,2 až 6 hmot.% Cu. Tyto materiály byly široce charakterizovánou řadou metod (ICP-OES, BET, XRD, UV-vis DRS, FTIR, Ramanova spektroskopie, TEM-EDX a fotoelektrochemickým měřením. CO2 redukce; fotokatalýza; Cu/TiO2; CH4
eng Photocatalytic reduction of carbon dioxide over Cu/TiO2 photocatalysts The photocatalytic reduction of CO2 with H2O was investigated using Cu/TiO2 photocatalysts in aqueous solution. For this purpose, Cu/TiO2 photocatalysts (with 0.2, 0.9, 2, 4, and 6 wt.% of Cu) have been synthesized via sol-gel method. The photocatalysts were extensively characterized by means of inductively coupled plasma optical emission spectrometry (ICP-OES), N-2 physisorption (BET), XRD, UV-vis DRS, FT-IR, Raman spectroscopy, TEM-EDX, and photoelectrochemical measurements. The as-prepared photocatalysts contain anatase as a major crystalline phase with a crystallite size around 13 nm. By increasing the amount of Cu, specific surface area and band gap energy decreased in addition to the formation of large agglomeration of CuO. Results revealed that the photocatalytic reduction of CO2 decreased in the presence of Cu/TiO2 in comparison to pure TiO2, which might be associated to the formation of CuO phase acting as a recombination center of generated electron-hole pair. Decreasing of photoactivity can also be connected with a very low position of conduction band of photocatalysts with high Cu content, which makes H-2 production necessary for CO2 reduction more difficult. CO2 reduction; Photocatalysis; Cu/TiO2; CH4

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