Enhanced photocatalytic degradation rates at rutile TiO₂ photocatalysts modified with redox co-catalysts

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• 作者：Susann Neubert ; Petra Pulisova ; Christian Wiktor ; Philipp Weide ; Bastian Mei ; Dmitrii A. Guschin ; Roland A. Fischer ; Martin Muhler ; Radim Beranek ; ^{radim.beranek@rub.de" class="auth_mail}
• 关键词：Photocatalysis ; Titanium dioxide ; Rutile ; Co-catalyst ; 4-Chlorophenol ; Water
• 刊名：Catalysis Today
• 出版年：July, 2014
• 年：2014
• 卷：230
• 期：Complete
• 页码：97-103
• 全文大小：1951 K

文摘

Nanocrystalline rutile TiO₂ powders were modified with small amounts of CuO_x and FeO_x clusters by impregnation and drying. The modified rutile samples exhibited drastically enhanced photocatalytic degradation of 4-chlorophenol under UV + vis (位 > 320 nm) irradiation. The reaction rates were increased by the factor of 7 and 4 for the optimized TiO₂(R)-CuO_x and TiO₂(R)-FeO_x samples containing 0.12 wt.% Cu and 0.13 wt.% Fe, respectively. The visible light (位 > 455 nm) activity in 4-CP degradation was negligible. Photopotential transient measurements have confirmed that amorphous CuO_x and FeO_x clusters deposited at the surface of rutile TiO₂ act as efficient co-catalysts for oxygen reduction by photogenerated electrons, which leads to improved charge separation and diminished recombination. This study shows that simple modification of TiO₂ photocatalysts with redox co-catalysts based on metal oxides is a promising strategy for enhancing the photocatalytic activity in degradation of aqueous pollutants.