Journal Pre-proof Preparation of heterojunction PPy/Fe 3 O 4 /Halloysite nano-clay Ag/Co nanocomposite for photocatalytic degradation of methylene blue under visible light irradiation Mojtaba Rouhi, Mohsen Babamoradi, Zoleikha Hajizadeh, Ali Maleki, Sajjad Tabar Maleki PII: S0030-4026(20)30557-X DOI: https://doi.org/10.1016/j.ijleo.2020.164721 Reference: IJLEO 164721 To appear in: Optik Received Date: 23 January 2020 Revised Date: 11 March 2020 Accepted Date: 7 April 2020 Please cite this article as: Rouhi M, Babamoradi M, Hajizadeh Z, Maleki A, Maleki ST, Preparation of heterojunction PPy/Fe 3 O 4 /Halloysite nano-clay Ag/Co nanocomposite for photocatalytic degradation of methylene blue under visible light irradiation, Optik (2020), doi: https://doi.org/10.1016/j.ijleo.2020.164721 This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. © 2020 Published by Elsevier.