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Volume 16
Issue 4
10.3390/coatings16040497
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Retraction of Coatings 2021, 11(3), 305.
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Retraction

RETRACTED: Raees et al. Synthesis and Characterization of CeO2/CuO Nanocomposites for Photocatalytic Degradation of Methylene Blue in Visible Light. Coatings 2021, 11, 305

by
Alia Raees
1,
Muhammad Asghar Jamal
1,*,
Ikram Ahmed
2,*,
Mika Silanpaa
3 and
Tahani Saad Algarni
4
1
Department of Chemistry, Government College University, Faisalabad 38000, Pakistan
2
Department of Chemistry, University of Sahiwal, Sahiwal 54000, Pakistan
3
Department of Civil and Environmental Engineering, Florida International University, Miami, FL 33301, USA
4
Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
*
Authors to whom correspondence should be addressed.
Coatings 2026, 16(4), 497; https://doi.org/10.3390/coatings16040497
Submission received: 24 November 2025 / Accepted: 17 April 2026 / Published: 20 April 2026
Versions Notes
The Journal retracts the article “Synthesis and Characterization of CeO2/CuO Nanocomposites for Photocatalytic Degradation of Methylene Blue in Visible Light” [1] cited above.
Following publication, concerns were brought to the attention of the Editorial Office regarding the overlap between Figure 4 presented in this article [1] and a figure depicting different experimental conditions in another publication [2], which shares partial authorship.
Adhering to our complaint procedure, an investigation was conducted by the Editorial Office and Editorial Board that confirmed an overlap between two figures presented in these two publications [1,2] presenting different experimental conditions. The authors were unable to satisfactorily explain the overlap of these figures, nor could they provide raw data requested by the Editorial Board (https://www.mdpi.com/journal/coatings/instructions#oriimages, accessed on 20 November 2025). As a result, the Editorial Board and Editor-in-Chief were unable to confirm the reliability of the findings and subsequently decided to retract this paper, as per MDPI’s retraction policy (https://www.mdpi.com/ethics#_bookmark30, accessed on 20 November 2025).
This retraction was approved by the Editor-in-Chief of the journal Coatings.
The authors have been informed of this retraction but did not provide a comment on this decision.

References

  1. Raees, A.; Jamal, M.A.; Ahmed, I.; Silanpaa, M.; Saad Algarni, T. RETRACTED: Synthesis and Characterization of CeO2/CuO Nanocomposites for Photocatalytic Degradation of Methylene Blue in Visible Light. Coatings 2021, 11, 305. [Google Scholar] [CrossRef]
  2. Ahmad, I.; Jamal, M.A.; Iftikhar, M.; Ahmad, A.; Hussain, S.; Asghar, H.; Saeed, M.; Yousaf, A.B.; Karri, R.R.; Al-kadhi, N.S.; et al. Lanthanum-Zinc Binary Oxide Nanocomposite with Promising Heterogeneous Catalysis Performance for the Active Conversion of 4-Nitrophenol into 4-Aminophenol. Coatings 2021, 11, 537. [Google Scholar] [CrossRef]
Disclaimer/Publisher’s Note: The statements, opinions and data contained in all publications are solely those of the individual author(s) and contributor(s) and not of MDPI and/or the editor(s). MDPI and/or the editor(s) disclaim responsibility for any injury to people or property resulting from any ideas, methods, instructions or products referred to in the content.

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MDPI and ACS Style

Raees, A.; Jamal, M.A.; Ahmed, I.; Silanpaa, M.; Saad Algarni, T. RETRACTED: Raees et al. Synthesis and Characterization of CeO2/CuO Nanocomposites for Photocatalytic Degradation of Methylene Blue in Visible Light. Coatings 2021, 11, 305. Coatings 2026, 16, 497. https://doi.org/10.3390/coatings16040497

AMA Style

Raees A, Jamal MA, Ahmed I, Silanpaa M, Saad Algarni T. RETRACTED: Raees et al. Synthesis and Characterization of CeO2/CuO Nanocomposites for Photocatalytic Degradation of Methylene Blue in Visible Light. Coatings 2021, 11, 305. Coatings. 2026; 16(4):497. https://doi.org/10.3390/coatings16040497

Chicago/Turabian Style

Raees, Alia, Muhammad Asghar Jamal, Ikram Ahmed, Mika Silanpaa, and Tahani Saad Algarni. 2026. "RETRACTED: Raees et al. Synthesis and Characterization of CeO2/CuO Nanocomposites for Photocatalytic Degradation of Methylene Blue in Visible Light. Coatings 2021, 11, 305" Coatings 16, no. 4: 497. https://doi.org/10.3390/coatings16040497

APA Style

Raees, A., Jamal, M. A., Ahmed, I., Silanpaa, M., & Saad Algarni, T. (2026). RETRACTED: Raees et al. Synthesis and Characterization of CeO2/CuO Nanocomposites for Photocatalytic Degradation of Methylene Blue in Visible Light. Coatings 2021, 11, 305. Coatings, 16(4), 497. https://doi.org/10.3390/coatings16040497

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