Lanthanide oxide-doped titanium dioxide: Effective photocatalysts for the degradation of organic pollutants |
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| Authors: | K T Ranjit H Cohen I Willner S Bossmann A M Braun |
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| Affiliation: | (1) Institute of Chemistry, and Farkas Center for Light-Induced Processes, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel;(2) Chemical Services Unit, Weizmann Institute of Science, Rehovot, 76100, Israel;(3) Institute of Chemistry, and Farkas Center for Light-Induced Processes, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel;(4) Engler-Bunte-Institut, Richard-Willstätter, Lehrstuhl für Umweltmesstechnik der Universität Karlsruhe (TH), Allee 5, 76128 Karlsruhe, Germany |
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| Abstract: | A series of lanthanide oxide-doped titanium dioxide photocatalysts Ln2O3/TiO2 (Ln3+ = Eu3+, Pr3+, Yb3+) were prepared. The photocatalysts reveal a substantially enhanced activity for the degradation of organic pollutants, as compared to undoped TiO2. The photodegradation processes of p-nitrobenzoic acid, (1), p-chlorophenoxyacetic acid, (2), aniline, (3), salicylic acid, (4), and trans-cinnamic acid, (5), with the different photocatalysts was examined. The photodegradation of (1)–(5) is significantly faster with Ln2O3/TiO2 photocatalysts and leads to complete mineralization of the organic compounds. The high activity of the Ln2O3/TiO2 photocatalysts is attributed to the enhanced association of the functionalized organic pollutants to lanthanide-ion surface sites. |
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