Lithium manganite anchored on mesoporous ceria photocatalyst for removal of Hg(II) ions from aqueous solution under visible illumination
Lithium manganite anchored on mesoporous ceria photocatalyst for removal of Hg(II) ions from aqueous solution under visible illumination
The development of effective photocatalysts is critical for the photo/redox reaction of noxious Hg(II) ions and Hgo in environmental engineering and purification. In this contribution, Li2MnO3 nanoparticles (NPs) were anchored mesoporous CeO2 networks to design photocatalysts with high harvest of visible light, and the obtained Li2MnO3/CeO2 nanocomposites were utilized for photoreduction of Hg(II) ions under visible illumination. The TEM and XRD results showed the formation of Li2MnO3 and CeO2 with the monoclinic and cubic fluorite structures, and the particle size is about 10–20 nm. The enhancement of light absorption of Li2MnO3/CeO2 nanocomposites could create considerable photoinduced carriers during the photocatalytic reactions. The incorporation of Li2MnO3 and CeO2 NPs demonstrated outstanding photocatalytic performance compared with pristine CeO2 NPs, and the optimum 9%Li2MnO3/CeO2 nanocomposite achieved 98 % of the reduction Hg(II) ability within 60 min. The rate constant for 9 % Li2MnO3/CeO2 photocatalyst is ∼ 6.47 and 3.85 times greater than Li2MnO3 and CeO2 NPs. The superior photocatalytic performance of Li2MnO3/CeO2 nanocomposites was ascribed to the efficient separation of photocarriers due to the formation of S-scheme heterojunction, the large surface area, and mesoporous structures. The obtained Li2MnO3/CeO2 nanocomposite was highly stable and efficient for the Hg(II) photoreduction runs up to five successive experiments under similar conditions. Moreover, the possible mechanism over heterojunctions Li2MnO3/CeO2 nanocomposites toward the reduction of Hg(II) ions is examined as well. The formation of S-scheme heterojunction photocatalyst provides better photocatalytic applications in terms of air purification, hydrogen production, and water treatment.
Heterojunction, Hg(II) ions removal, LiMnO/CeO, Photocatalyst, Visible illumination
25494-25502
Al-Hajji, L.A.
b41d883d-7b38-4a7b-99ee-7d8610aa98bc
Alsaidi, M.
291160cb-51cf-4752-91cf-2bc8e7973e4a
Ghanem, Mohamed A.
f9b5b27c-7ebd-4e43-ac75-93d6e023fc33
Ismail, Adel A.
45036c79-92c9-402f-9911-b270b798ea03
Mohammed, Khaled M.H.
1c3c5641-4d0a-4c4d-bb26-fe733b8dbf63
3 June 2024
Al-Hajji, L.A.
b41d883d-7b38-4a7b-99ee-7d8610aa98bc
Alsaidi, M.
291160cb-51cf-4752-91cf-2bc8e7973e4a
Ghanem, Mohamed A.
f9b5b27c-7ebd-4e43-ac75-93d6e023fc33
Ismail, Adel A.
45036c79-92c9-402f-9911-b270b798ea03
Mohammed, Khaled M.H.
1c3c5641-4d0a-4c4d-bb26-fe733b8dbf63
Al-Hajji, L.A., Alsaidi, M., Ghanem, Mohamed A., Ismail, Adel A. and Mohammed, Khaled M.H.
(2024)
Lithium manganite anchored on mesoporous ceria photocatalyst for removal of Hg(II) ions from aqueous solution under visible illumination.
Ceramics International, 50 (14), .
(doi:10.1016/j.ceramint.2024.04.283).
Abstract
The development of effective photocatalysts is critical for the photo/redox reaction of noxious Hg(II) ions and Hgo in environmental engineering and purification. In this contribution, Li2MnO3 nanoparticles (NPs) were anchored mesoporous CeO2 networks to design photocatalysts with high harvest of visible light, and the obtained Li2MnO3/CeO2 nanocomposites were utilized for photoreduction of Hg(II) ions under visible illumination. The TEM and XRD results showed the formation of Li2MnO3 and CeO2 with the monoclinic and cubic fluorite structures, and the particle size is about 10–20 nm. The enhancement of light absorption of Li2MnO3/CeO2 nanocomposites could create considerable photoinduced carriers during the photocatalytic reactions. The incorporation of Li2MnO3 and CeO2 NPs demonstrated outstanding photocatalytic performance compared with pristine CeO2 NPs, and the optimum 9%Li2MnO3/CeO2 nanocomposite achieved 98 % of the reduction Hg(II) ability within 60 min. The rate constant for 9 % Li2MnO3/CeO2 photocatalyst is ∼ 6.47 and 3.85 times greater than Li2MnO3 and CeO2 NPs. The superior photocatalytic performance of Li2MnO3/CeO2 nanocomposites was ascribed to the efficient separation of photocarriers due to the formation of S-scheme heterojunction, the large surface area, and mesoporous structures. The obtained Li2MnO3/CeO2 nanocomposite was highly stable and efficient for the Hg(II) photoreduction runs up to five successive experiments under similar conditions. Moreover, the possible mechanism over heterojunctions Li2MnO3/CeO2 nanocomposites toward the reduction of Hg(II) ions is examined as well. The formation of S-scheme heterojunction photocatalyst provides better photocatalytic applications in terms of air purification, hydrogen production, and water treatment.
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Accepted/In Press date: 21 April 2024
e-pub ahead of print date: 22 April 2024
Published date: 3 June 2024
Additional Information:
Publisher Copyright:
© 2024 Elsevier Ltd and Techna Group S.r.l.
Keywords:
Heterojunction, Hg(II) ions removal, LiMnO/CeO, Photocatalyst, Visible illumination
Identifiers
Local EPrints ID: 491173
URI: http://eprints.soton.ac.uk/id/eprint/491173
ISSN: 0272-8842
PURE UUID: 0d59c9bb-147d-4ec4-95ea-db1c11addcc2
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Date deposited: 13 Jun 2024 17:15
Last modified: 15 Jun 2024 01:59
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Contributors
Author:
L.A. Al-Hajji
Author:
M. Alsaidi
Author:
Mohamed A. Ghanem
Author:
Adel A. Ismail
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