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This is to certify that your paper entitled «Synthesis of Various Zinc Oxide Nanostructures by Hydrothermal Method Using Molybdophosphoric Acid and Their Photocatalytic Application for Degradation of Congo Red» was indexed with 7 pages, in the CIVILICA citation database, code COI:OGPH01_033, after evaluation and approval of the referees of the "First International Conference on Oil, Gas, Petrochemical and HSE held in Hamadan 2017.

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.