期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 610, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2020.125743
关键词
Nitrogen doping; Visible light; Benzyl alcohol; Benzylamine; TiO2
资金
- Science Achievement Scholarship of Thailand
- Chiang Mai University
- Global Partnership Research Fund through Center of Excellence in Materials Science and Technology and Office of National Higher Education Science Research and Innovation Policy Council (NXPO)
- TRF Distinguished Research Professor Award [DPG6080002]
- ARC [DE160100504, CE140100012]
- Graduate School
This study demonstrates a simple method to synthesize N-doped TiO2, which shows enhanced photocatalytic activity towards the selective oxidation of benzyl alcohol and benzylamine under visible light, while also expanding the range of tolerated substrates.
N-doped TiO2, denoted as T_400, was prepared simply by the facile thermal hydrolysis of TiOSO4 using NH4OH as both a precipitating agent and a nitrogen source. Compared to TiO2 without nitrogen doping, T_400 provides superior photocatalytic activity toward the selective oxidation of benzyl alcohol and benzylamine under visible light irradiation, with > 85 % conversion and > 95 % selectivity to benzaldehyde and N-benzylidenebenzylamine products, respectively. The increased photoactivity of T_400 is ascribed to enhanced visible-light absorption and efficient photogenerated charge transfer and separation as supported by UV-vis DRS, photoelectrochemical and VB-XPS results. The catalyst can tolerate the presence of substituent groups in benzyl alcohol and benzelamine molecules as > 80 % conversion and > 95 % selectivity are still achieved, which expands the scope of substrates and catalyst utilization. Band energy level of N-doped TiO2 compared to that of undoped TiO2 is determined using Mott-Schottky and UV-vis DRS measurements. Possible mechanisms for the formation of benzaldehyde and N-benzylidenebenzylamine over N-doped TiO2 are proposed. This work presents a simple synthesis of N-doped TiO2, using a low-cost and easily handled inorganic titanium salt instead of air/moisture-sensitive alkoxide precursors and reveals its potential application toward photocatalytic synthesis of organic fine chemicals under visible light.
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