Retraction notice to “Design Ag-doped ZnO heterostructure photocatalyst with sulfurized graphitic C₃N₄ showing enhanced photocatalytic activity” [Mater. Sci. Eng. B 272 (2021) 115320] (Materials Science & Engineering B (2021) 272, (S0921510721002804), (10.1016/j.mseb.2021.115320))

This article has been retracted: please see Elsevier policy on Article Correction, Retraction and Removal (https://www.elsevier.com/about/policies-and-standards/article-withdrawal). This article has been retracted at the request of the Editors-in-Chief. It is unclear how the authors from different countries collaborated with each other to complete this joint task. It is also unclear how authors with completely different backgrounds contributed to this research. In addition to these concerns, Fig. 1 in this article is identical to Fig. 1 found in the Journal of Alloys and Compounds (JALCOM) https://doi.org/10.1016/j.jallcom.2020.158338. In JALCOM the axis is cropped and the patterns re-arranged. The SEM images in Fig. 2a,b in the article are identical to the ones in Fig. 2a,b of the JALCOM article, but in the MSB article the images have been cropped and rotated. Fig. 9a,b of this article is identical to Fig. 9c,d of the JALCOM article, but data appears to have been re-arranged. The scientific community takes a very strong view on this matter and apologies are offered to readers of the journal that this was not detected during the submission process.