Prussian blue-conjugated ZnO nanoparticles for near-infrared light-responsive photocatalysis

Abstract

Zinc oxide (ZnO)-based photocatalysis has great potential in wastewater treatment, but its photocatalytic performance suffers from the limitation of low-wavelength photon absorption. Herein, a near-infrared-responsive photocatalyst is developed to tackle this challenge, which is composed of Prussian blue (PB) dye conjugated iron oxide-zinc oxide hybrid nanoparticles (Fe3O4@PB@ZnO) with spherical morphology (∼14 nm). Fe3O4@PB@ZnO shows a higher-wavelength absorbance region centered at 781 nm as compared with PB-free Fe3O4-ZnO composite (Fe3O4@ZnO, 494 nm) and pristine ZnO (361 nm). The inclusion of a charge transfer band (FeII-CN-FeIII) after the conjugation of PB is responsible for such a profound absorbance shift. A comparative study of three samples as potential photocatalysts is performed in terms of the methylene blue degradation, which is found to be in an order of Fe3O4@PB@ZnO ˃ Fe3O4@ZnO ˃ ZnO. The enhanced photocatalysis rate of Fe3O4@PB@ZnO is credited to the lower bandgap of 1.2 eV from the presence of PB with low bandgap, retarded the recombination rate of electron-hole pair to produce enough reactive oxygen species from the rich surface vacancies and hole scavenging properties of PB. A plausible degradation mechanism of photocatalysis is proposed, revealing the singlet oxygen as the central point of enhanced performance.

RAS ID

44800

Document Type

Journal Article

Date of Publication

1-1-2022

Volume

23

Funding Information

Australian Research Council

Natural Science Foundation of Jiangsu Province, China

School

School of Engineering

Grant Number

ARC Number : DP200103332, DP200103315

Copyright

subscription content

Publisher

Elsevier

Comments

Fatima, H., Azhar, M. R., Khiadani, M., Zhong, Y., Wang, W., Su, C., & Shao, Z. (2022). Prussian blue-conjugated ZnO nanoparticles for near-infrared light-responsive photocatalysis. Materials Today Energy, 23, article 100895.

https://doi.org/10.1016/j.mtener.2021.100895

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Link to publisher version (DOI)

10.1016/j.mtener.2021.100895