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Microstructure and Photocatalytic Performance of BaTi5O11 Nanocrystals Synthesized via Sol-Gel Method Mediated by
Honghua Wang1, Tianchen Gao1, Xinyi Li2
1School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
Abstract:
BaTi5O11 nanocrystals were synthesized via a sol-gel method employing different organic solvents. The influence of solvent choice on microstructure and photocatalytic performance was investigated through methylene blue (MB) degradation under UV light irradiation. The monoclinic BaTi5O11 nanocrystals were successfully synthesized, where solvent selection significantly affected their grain size and Brunauer-Emmett-Teller (BET) surface area. The BaTi5O11 nanocrystals synthesized using polyethylene glycol-200 (PEG-200) exhibited the highest BET surface area (9.78 m2/g) and smallest average pore size (17.8 nm). The BaTi5O11 nanocrystals also displayed a larger optical bandgap (3.61 eV), attributed to pronounced quantum confinement and surface effects. Consequently, the PEG-200-derived BaTi5O11 photocatalyst achieved complete MB degradation within 30 min under UV light irradiation. This enhanced performance was attributed to the high BET surface area providing abundant active sites. Furthermore, the BaTi5O11 nanocrystal photocatalyst maintained excellent reusability and stability over four consecutive cycles.
