Retraction notice to "Highly operative NiO/ZnO nanocomposites for photocatalytic removal of azo dye"[Chemosphere 308 (2022) 136528].

This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/policies/article-withdrawal).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This article has been retracted at the request of the Editors-in-Chief.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 authorship and conflict of interest related to the submission and review of this paper. An authorship change was made during the revision of this paper; an author was removed from the revised paper without validation or authorisation. The authors did not adequately address the concerns raised about the change. In addition, review of this submission was handled by Guest Editor Pau Loke Show despite an extensive record of collaboration, including co-publication, with one of the paper co-authors (Wei-Hsin Chen). This compromised the editorial process and breached the journal's policies. The authors disagree with this retraction and dispute the grounds for it.>.