Retraction notice to “Comparative study of ozonation and ozonation catalyzed by Fe-loaded biochar as catalyst to remove methylene blue from aqueous solution” [Chemosphere 307 Part 1, November 2022, 135738] (Chemosphere (2022) 307(P1), (S0045653522022317), (10.1016/j.chemosphere.2022.135738))

This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/policies/article-withdrawal). This article has been retracted at the request of the Editors-in-Chief. A journal-wide investigation by Elsevier's Research Integrity & Publishing Ethics team identified violations of the journal's policies on conflict of interest related to the submission and review of this paper. Review of this submission was handled by Guest Editor Pau Loke Show despite an extensive record of collaboration, including co-publication, with three of the paper co-authors (Kit Wayne Chew, Kuan Shiong Khoo, Muhammad Mubashir). Acceptance of the article was partly based upon the positive advice of a reviewer who was closely linked to two of the authors (Khoo, Mubashir) and who submitted a templated review identical to that provided for multiple manuscripts. This compromised the editorial process and breached the journal's policies. Amir Ikhlaq agrees with the retraction. Kuan Shiong Khoo and Kit Wayne Chew acknowledge the retraction. The other authors have not responded to this retraction.