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ZnS quantum dots intercalated layered double hydroxide semiconductors for solar water splitting and organic pollutant degradation

Abstract

Semiconducting quantum dots (QDs) have been widely utilized in photocatalytic degradation of persistent organic pollutants, water splitting and solar cells. However, their photocatalytic application is greatly restricted by the quantum confinement effect, poor photostability, and low electron-hole separation efficiency. In the case of ZnS quantum dots, the intrinsic wide band gap is added to the mentioned challenges, although zinc sulfide is considered as a non-toxic semiconductor. Here in, we report the synthesis of MIIZnAl-layered double hydroxide/ZnS QDs (MII= Co or Mn) via in situ growth of oppositely charged 2D layered double hydroxide layers (LDH) in the presence of negatively charged ZnS QDs. The partial intercalating of ZnS QDs in interlayer space of the LDHs is evidenced by powder X-ray diffraction. In comparison with ZnS QDs and pristine LDHs, the prepared CoZnAl-LDH/ZnS and MnZnAl-LDH/ZnS nanocomposites show surprisingly enhanced visible light harvesting ability with expanding the ligand to metal charge transfer absorption edge to visible wavelengths. The obtained results imply the effective electronic coupling between ZnS QDs and LDHs. The charge carrier recombination is largely suppressed as indicated by the photoluminescence and electrochemical impedance spectroscopy. The resultant nanocomposites reveal promising activity for visible light photocatalytic oxygen evolution via water splitting, degradation of Acid Red 14, as a model organic pollutant, and a significantly enhanced photocurrent density as well as photostability; much superior to those of pristine LDH and ZnS QDs. The present findings provide a facile strategy to fabricate the nanocomposites which benefit the unique properties of environmentally friendly ZnS QDs and LDHs for photocatalytic applications.

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Supplementary files

Publication details

The article was received on 05 Feb 2019, accepted on 01 Apr 2019 and first published on 03 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA01412H
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    ZnS quantum dots intercalated layered double hydroxide semiconductors for solar water splitting and organic pollutant degradation

    A. R. Amani-Ghadim, F. khodam and M. S. Seyed Dorraji, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA01412H

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