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Graphene-based plasmonic nanocomposites for highly enhanced solar-driven photocatalytic activities

Adam, Rania E. ; Chalangar, Ebrahim ; Pirhashemi, Mahsa ; Pozina, Galia ; Liu, Xianjie ; Palisaitis, Justinas ; Pettersson, Håkan LU ; Willander, Magnus and Nur, Omer (2019) In RSC Advances 9(52). p.30585-30598
Abstract

High-efficiency photocatalysts are crucial for the removal of organic pollutants and environmental sustainability. In the present work, we report on a new low-temperature hydrothermal chemical method, assisted by ultrasonication, to synthesize disruptive plasmonic ZnO/graphene/Ag/AgI nanocomposites for solar-driven photocatalysis. The plasmonic nanocomposites were investigated by a wide range of characterization techniques, confirming successful formation of photocatalysts with excellent degradation efficiency. Using Congo red as a model dye molecule, our experimental results demonstrated a photocatalytic reactivity exceeding 90% efficiency after one hour simulated solar irradiation. The significantly enhanced degradation efficiency is... (More)

High-efficiency photocatalysts are crucial for the removal of organic pollutants and environmental sustainability. In the present work, we report on a new low-temperature hydrothermal chemical method, assisted by ultrasonication, to synthesize disruptive plasmonic ZnO/graphene/Ag/AgI nanocomposites for solar-driven photocatalysis. The plasmonic nanocomposites were investigated by a wide range of characterization techniques, confirming successful formation of photocatalysts with excellent degradation efficiency. Using Congo red as a model dye molecule, our experimental results demonstrated a photocatalytic reactivity exceeding 90% efficiency after one hour simulated solar irradiation. The significantly enhanced degradation efficiency is attributed to improved electronic properties of the nanocomposites by hybridization of the graphene and to the addition of Ag/AgI which generates a strong surface plasmon resonance effect in the metallic silver further improving the photocatalytic activity and stability under solar irradiation. Scavenger experiments suggest that superoxide and hydroxyl radicals are responsible for the photodegradation of Congo red. Our findings are important for the fundamental understanding of the photocatalytic mechanism of ZnO/graphene/Ag/AgI nanocomposites and can lead to further development of novel efficient photocatalyst materials.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
RSC Advances
volume
9
issue
52
pages
14 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85072786654
ISSN
2046-2069
DOI
10.1039/c9ra06273d
language
English
LU publication?
yes
id
b77ccba8-f74a-4b05-bef3-ee0d7979b978
date added to LUP
2020-01-16 20:37:20
date last changed
2020-01-20 10:36:41
@article{b77ccba8-f74a-4b05-bef3-ee0d7979b978,
  abstract     = {<p>High-efficiency photocatalysts are crucial for the removal of organic pollutants and environmental sustainability. In the present work, we report on a new low-temperature hydrothermal chemical method, assisted by ultrasonication, to synthesize disruptive plasmonic ZnO/graphene/Ag/AgI nanocomposites for solar-driven photocatalysis. The plasmonic nanocomposites were investigated by a wide range of characterization techniques, confirming successful formation of photocatalysts with excellent degradation efficiency. Using Congo red as a model dye molecule, our experimental results demonstrated a photocatalytic reactivity exceeding 90% efficiency after one hour simulated solar irradiation. The significantly enhanced degradation efficiency is attributed to improved electronic properties of the nanocomposites by hybridization of the graphene and to the addition of Ag/AgI which generates a strong surface plasmon resonance effect in the metallic silver further improving the photocatalytic activity and stability under solar irradiation. Scavenger experiments suggest that superoxide and hydroxyl radicals are responsible for the photodegradation of Congo red. Our findings are important for the fundamental understanding of the photocatalytic mechanism of ZnO/graphene/Ag/AgI nanocomposites and can lead to further development of novel efficient photocatalyst materials.</p>},
  author       = {Adam, Rania E. and Chalangar, Ebrahim and Pirhashemi, Mahsa and Pozina, Galia and Liu, Xianjie and Palisaitis, Justinas and Pettersson, Håkan and Willander, Magnus and Nur, Omer},
  issn         = {2046-2069},
  language     = {eng},
  month        = {01},
  number       = {52},
  pages        = {30585--30598},
  publisher    = {Royal Society of Chemistry},
  series       = {RSC Advances},
  title        = {Graphene-based plasmonic nanocomposites for highly enhanced solar-driven photocatalytic activities},
  url          = {http://dx.doi.org/10.1039/c9ra06273d},
  doi          = {10.1039/c9ra06273d},
  volume       = {9},
  year         = {2019},
}