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Design and Synthesis of Sm, Y, La and Nd‐doped CeO 2 with a broom‐like hierarchical structure: a photocatalyst with enhanced oxidation performance
Author(s) -
Xu Bin,
Yang Hui,
Zhang Qitao,
Yuan Saisai,
Xie An,
Zhang Ming,
Ohno Teruhisa
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201902309
Subject(s) - cerium , photocatalysis , radical , photochemistry , doping , materials science , ion , visible spectrum , catalysis , chemistry , inorganic chemistry , organic chemistry , optoelectronics
CeO 2 doped with various rare earth (RE) ions (Sm, Y, La and Nd) having a broom‐like hierarchical structure was successfully prepared by a template‐free hydrothermal method. The photooxidation performance of RE‐doped products was significantly better than that of pure CeO 2 , and comparative experiments showed that Sm‐doped CeO 2 (SC) has superior photooxidation activity, resulting about 3.0‐times and 8.5‐times higher activities of bisphenol A (BPA) degradation and of acetaldehyde (CH 3 CHO) decomposition, respectively, than those of pure CeO 2 . Due to the incorporation of RE ions, the surface exposed cerium ions are partly substituted by those cations, resulting in a higher concentration of oxygen vacancies (O v ) in RE‐doped CeO 2 . The increased O v can act as a trapping center for photo‐generated electrons to form a doping transition state between the conduction band (CB) and valence band (VB), which can restrict the recombination rate of electrons and holes effectively and lead to an outstanding enhancement of photooxidation performance. Furthermore, abundant highly reactive hydroxyl radicals ( . OH) and superoxide radicals ( . O 2 − ), which are efficient intermediates with vivid oxidation ability, can further enhance the photocatalytic activity of RE‐doped CeO 2 . A cost‐effective strategy for designing CeO 2 ‐based semiconductor photocatalysts doped with multitudinous RE ions that have enhanced photooxidation performance is presented in this paper.