The synthesis of U3O8/SiO2 nanocomposites with HCl was achieved with a solution containing 0.6389 g uranyl acetate (UO2(CH3COO2)2•2H2O), 3.5 mL of DI water, 2methyoxyethanol C3H8O2, and 1.0 mL of catalysis added to the solution and stirred for 20 minutes. The resulting preparation was aged for 72 h. After it, the sample was dried at 100°C for 4 h. In this work a material weight of 1. 0556 g of material was calcinated for 4 h under an N2 atmosphere for 4h. Samples grown under basic catalysis with different time intervals values are: 1h, 2h, and 4h.