Jump to main content
Jump to site search


La-Doped ZnWO4 nanorods with enhanced photocatalytic activity for NO removal: effects of La doping and oxygen vacancies

Author affiliations

Abstract

La3+-Doped ZnWO4 nanorods were prepared via a hydrothermal method for the photocatalytic NO removal under simulated solar light irradiation. It was revealed by photocatalytic experiments that the 0.6% La3+-doped ZnWO4 nanorods exhibited the best photocatalytic activities for NO removal (46%) in comparison with other samples. The enhanced photocatalytic activity could be attributed to La3+ ion doping, which creates an abundance of oxygen vacancies (OVs) as confirmed by the electron paramagnetic response (EPR). The optical response ability was promoted by La3+ ion doping and the construction of OVs according to the results of UV-vis spectra. Density functional theory (DFT) calculations were further conducted, revealing that the introduction of La3+ ions and high concentrations of OVs can narrow the band gap of ZnWO4. The e and ˙O2 radical species are found to play critical roles in the oxidative removal process via the scavenger experiments and the DMPO-ESR measurements. Furthermore, the possible photocatalytic reaction mechanism was also proposed based on the products formed during the photocatalytic reaction, which were traced by in situ Fourier transform infrared spectroscopy (in situ FTIR). Overall, the findings in this work can provide inspiration for the design and synthesis of rare earth ion-doped and OV-rich photocatalysts with highly efficient photocatalytic NO removal.

Graphical abstract: La-Doped ZnWO4 nanorods with enhanced photocatalytic activity for NO removal: effects of La doping and oxygen vacancies

Back to tab navigation

Supplementary files

Publication details

The article was received on 08 Sep 2019, accepted on 29 Oct 2019 and first published on 30 Oct 2019


Article type: Research Article
DOI: 10.1039/C9QI01152H
Inorg. Chem. Front., 2020, Advance Article

  •   Request permissions

    La-Doped ZnWO4 nanorods with enhanced photocatalytic activity for NO removal: effects of La doping and oxygen vacancies

    J. Nie, Q. Hassan, Y. Jia, J. Gao, J. Peng, J. Lu, F. Zhang, G. Zhu and Q. Wang, Inorg. Chem. Front., 2020, Advance Article , DOI: 10.1039/C9QI01152H

Search articles by author

Spotlight

Advertisements