1 One-step hydrothermal synthesis of Cu/Bi/CuBi2O4nanocomposite and investigation of its photocatalytic performance in methylene blue degradation and dibenzothiophene desulfurization 1 In this research, for the first time, Cu/Bi/CuBi2O4(copper/bismuth/copper bismuth oxide) nanocomposite was synthesized through a one-step hydrothermal method using hydrazine. Synthesized product was characterized using XRD, DRS, FT-IR, EDS, and FESEM techniques. Diffuse reflectance spectrum analysis showed that Cu/Bi/CuBi2O4nanocomposite has much higher light absorption than pure CuBi2O4, especially in the visible light range. The photocatalytic efficiency of Cu/Bi/CuBi2O4nanocomposite in the degradation of methylene blue (MB) as well as in the desulfurization of dibenzothiophene (DBT) was 93% and 87%, respectively, which shows a significant increase compared to pure CuBi2O4with an efficiency of 40% (for the destruction of methylene blue) and 39% (for desulfurization). Examining the effect of pH showed that the photocatalyst has a higher efficiency (93%) in an acidic environment (pH = 4) and the efficiency decreases with increasing pH, so that at pH = 7 and pH = 9, the efficiency was 83% and 69%, respectively. Furthermore, the reusability tests demonstrated that the synthesized Cu/Bi/CuBi2O4photocatalyst exhibited excellent stability and recyclability for DBT desulfurization and MB degradation, maintaining its efficiency even after five reaction cycles. 1 6 Mohammad Reza Tahmasbi Department of Nanotechnology, Faculty of New Sciences and Technologies, Semnan University Iran info@jourcc.com Mehdi Mousavi-Kamazani Department of Nanotechnology, Faculty of New Sciences and Technologies, Semnan University Iran M.Mousavi@semnan.ac.ir Mohammad Ghodrati Department of Nanotechnology, Faculty of New Sciences and Technologies, Semnan University Iran info@jourcc.com Sanaz Alamdari Department of Nanotechnology, Faculty of New Sciences and Technologies, Semnan University Iran info@jourcc.com Photocatalyst Desulfurization Methylene blue Cu/Bi/CuBi2O4 Hydrothermal Article1.pdf [1] N. Rabiee, Y. Fatahi, M. Asadnia, H. Daneshgar, M. Kiani, A.M. Ghadiri, M. Atarod, A.H. Mashhadzadeh, O. Akhavan, M. 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