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This is to certify that your paper entitled «Comparison of gas phase and water solvent in adsorption of para-chlorophenol on polypyrrole with density functional theory» was indexed with 12 pages, in the CIVILICA citation database, code COI:BCBCN07_047, after evaluation and approval of the referees of the "The 7th National Innovation and Technology Conference of Biological Sciences and Chemistry of Iran held in Tehran 2023.

While offering our congratulations on the indexation of your paper, please be informed that this certificate is prepared based on the information submitted by the secretariat of the above conference and the information contained in the CIVILICA database, and the accuracy of its content can be inquired at any time through link provided at the bottom of the page or scanning the code image.