The Z-scheme NH2-UiO-66/PTCDA composite for enhanced photocatalytic Cr(VI) reduction under low-power LED visible light

Xian Wei; Chong-Chen Wang; Yang Li; Peng Wang; Qi Wei

doi:10.1016/j.chemosphere.2021.130734

The Z-scheme NH₂-UiO-66/PTCDA composite for enhanced photocatalytic Cr(VI) reduction under low-power LED visible light

Chemosphere. 2021 Oct:280:130734. doi: 10.1016/j.chemosphere.2021.130734. Epub 2021 May 4.

Authors

Xian Wei¹, Chong-Chen Wang², Yang Li¹, Peng Wang¹, Qi Wei³

Affiliations

¹ Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, PR China.
² Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, PR China. Electronic address: wangchongchen@bucea.edu.cn.
³ College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China.

PMID: 33975242
DOI: 10.1016/j.chemosphere.2021.130734

Abstract

Series Z-scheme NH₂-UiO-66/PTCDA (NU100PX) composites constructed from NH₂-UiO-66 and PTCDA (3,4,9,10-perylenetetracarboxylic dianhydride) were obtained by simple ball-milling method. The photocatalytic Cr(VI) reduction activities of the NU100PX composites were conducted upon the irradiation of low power LED visible light. The results revealed that the introduction of a small amount of PTCDA on the surface of NH₂-UiO-66 could broaden the light absorption range and boost the separation of photo-induced charge carriers to promote the photocatalysis efficiency. The influence factors toward photocatalytic Cr(VI) cleanup performances of NU100P10 like pH, initial Cr(VI) concentrations, the impacts of small organic acids as hole capture agents along with various co-existing foreign matters were clarified. After 5 runs' adsorption-photoreduction towards Cr(VI), the NU100P10 still exhibited superior reduction activity and reusability. The Z-scheme mechanism of photocatalytic Cr(VI) removal over NU100P10 was put forward and certificated by electrochemical experiment, ESR (electron spin resonance) test, XPS determination, photo-deposition and DFT (density functional theory) calculation.

Keywords: 3,4,9,10-Perylenetetracarboxylic dianhydride; DFT calculation; NH(2)-UiO-66; Photocatalytic Cr(VI) reduction; Z-Scheme.

MeSH terms

Adsorption
Catalysis
Chromium*
Light*

Substances

Chromium
chromium hexavalent ion