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Simple preparation of nitrogen-doped TiO2 and its performance in selective oxidation of benzyl alcohol and benzylamine under visible light

Journal Article


Abstract


  • © 2020 Elsevier B.V. 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.

UOW Authors


  •   Japa, Mattawan (external author)
  •   Tantraviwat, Doldet (external author)
  •   Phasayavan, Witchaya (external author)
  •   Nattestad, Andrew
  •   Chen, Jun
  •   Inceesungvorn, Burapat (external author)

Publication Date


  • 2020

Citation


  • Japa, M., Tantraviwat, D., Phasayavan, W., Nattestad, A., Chen, J. & Inceesungvorn, B. (2020). Simple preparation of nitrogen-doped TiO2 and its performance in selective oxidation of benzyl alcohol and benzylamine under visible light. Colloids and Surfaces A: Physicochemical and Engineering Aspects,

Scopus Eid


  • 2-s2.0-85094937765

Place Of Publication


  • Netherlands

Abstract


  • © 2020 Elsevier B.V. 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.

UOW Authors


  •   Japa, Mattawan (external author)
  •   Tantraviwat, Doldet (external author)
  •   Phasayavan, Witchaya (external author)
  •   Nattestad, Andrew
  •   Chen, Jun
  •   Inceesungvorn, Burapat (external author)

Publication Date


  • 2020

Citation


  • Japa, M., Tantraviwat, D., Phasayavan, W., Nattestad, A., Chen, J. & Inceesungvorn, B. (2020). Simple preparation of nitrogen-doped TiO2 and its performance in selective oxidation of benzyl alcohol and benzylamine under visible light. Colloids and Surfaces A: Physicochemical and Engineering Aspects,

Scopus Eid


  • 2-s2.0-85094937765

Place Of Publication


  • Netherlands