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ORIGINAL ARTICLE Introduction: In this study, nanosized zero-valent zinc (Zn 0 ) as a reducing agent, simultaneously synthesized and immobilized on an oxidizing agent, ZnO photocatalyst for degradation of methyl orange (MO) from the aqueous solution. Materials and Methods: The prepared redox nanocomposite (nZn 0 -ZnO) was characterized by the XRD and SEM techniques. The prepared sample was separated by centrifuging. The preparation process of nZn 0 -ZnO including synthesis-immobilization, washing, and drying carried out under Argon gas flow. Moreover, the effect of temperature and kinetics reaction was studied. Results: The results showed that degradation efficiency of prepared redox nanocomposite was increased compared to each ZnO nanopowder and Zn 0 under the same operational condition. The calculated activation energy for the degradation process was 4.05 KJ.mol -1 . Finally, the results showed that the degradation processes followed pseudo first order kinetic model in the basic condition by the relative deviation modulus. Conclusion: As compared to ZnO nanopowder and Zn 0 , the prepared redox nanocomposite showed high degradation efficiency for the removal of methyl orange from the aqueous solution. Article History: Received:23 October 2018 Accepted: 20 January 2019

Preparation of Nanosized Zero-Valent zinc (Zn0) Immobilized on ZnO as Redox Nanocomposite for Degradation of Methyl Orange from Aqueous Solution