Chemical Structure of TiO2Nanotube Photocatalysts Promoted by Copper and Iron | Zendy

Chang-Yu Liao | Zendy; H. Paul Wang | Zendy; HongPing Lin | Zendy

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Chemical Structure of TiO₂Nanotube Photocatalysts Promoted by Copper and Iron

Author(s) -

Chang-Yu Liao,

H. Paul Wang,

HongPing Lin

Publication year - 2013

Publication title -

international journal of photoenergy

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.426

H-Index - 51

eISSN - 1687-529X

pISSN - 1110-662X

DOI - 10.1155/2013/243160

Subject(s) - photocatalysis , xanes , copper , extended x ray absorption fine structure , materials science , visible spectrum , spectroscopy , absorption (acoustics) , absorption spectroscopy , photochemistry , methylene blue , degradation (telecommunications) , nuclear chemistry , inorganic chemistry , chemistry , catalysis , metallurgy , organic chemistry , telecommunications , physics , optoelectronics , quantum mechanics , computer science , composite material

TiO2 nanotubes (TNTs) promoted by copper (5%) (Cu-TNT) and iron (5%) (Fe-TNT) were prepared for visible-light photocatalysis. By X-ray absorption near edge structure (XANES) spectroscopy, it is found that the enhanced photocatalytic degradation of methylene blue (MB) on Cu-TNT and Fe-TNT is associated with the predominant surface photoactive sites A2 ((Ti=O)O4). By extended X-ray absorption fine structure (EXAFS) spectroscopy, the dispersed copper and iron also cause increases in the Ti–O and Ti–(O)–Ti bond distances by 0.01-0.02 and 0.04-0.05 Å, respectively. The decreased Ti–O bonding energy may lead to an increase of photoexcited electron transport. The copper- or-iron promoted TNT can thus enhance photocatalytic degradation of MB under the visible-light radiation

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