New Understanding on Photocatalytic Mechanism of Nitrogen-Doped Graphene Quantum Dots-Decorated BiVO4 Nanojunction Photocatalysts
Journal article, 2017

Bismuth vanadate (BiVO4) is a promising candidate as a visible-light-driven photocatalyst in the aspect of practical applications. To investigate the origin of active species from BiVO4 and understand the influence of the variations of the photocatalytic process, comparative studies on zero-dimensional nitrogen-doped graphene quantum dot (NGQD)-decorated BiVO4 have been carried out for methylene blue photodegradation. It was found that the hydroxyl group-rich NGQD surface and the established heterojunction structure between NGQDs and BiVO4 were greatly beneficial for the conversion of the MOH radical. With NGQD decoration, the dominant oxidant species for NGQDs/BiVO4 were confirmed to be MOH and H2O2, rather than holes originating from the valence band of unmodified BiVO4. The synergistic photocatalytic mechanism with respect to the interfacial charge transport and the conversion of active species was proposed. The achievement of the controllable active species significantly altering the activity may be applied for different photocatalytic reactions.

Author

Hengyan Yang

University of Shanghai for Science and Technology

Ping Wang

University of Shanghai for Science and Technology

Ding Wang

University of Shanghai for Science and Technology

Yuankun Zhu

University of Shanghai for Science and Technology

Kunpeng Xie

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Reaction Engineering

Competence Centre for Catalysis (KCK)

Xianglong Zhao

Chinese Academy of Sciences

Junhe Yang

University of Shanghai for Science and Technology

Xianying Wang

University of Shanghai for Science and Technology

ACS Omega

2470-1343 (eISSN)

Vol. 2 7 3766-3773

Subject Categories

Botany

Ecology

Other Chemistry Topics

DOI

10.1021/acsomega.7b00603

More information

Latest update

10/2/2018