Photocatalytic Decomposition of 1,1-Dimethyl Hydrazine in Aqueous Media by Recyclable Titania Nano Photocatalyst

1,1-Dimethylhydrazine (UDMH) is used as a liquid fuel for missile and is a toxic matter. In this work to decontaminate UDMH from aqueous solution, hybridized photocatalytic and hydrogen peroxide oxidation processes have been used. The process was performed in a suspension reactor equipped with a UV-C lamp (150 W). Fe3O4@SiO2@TiO2 (FST) catalyst was used as a magnetic recyclable photocatalyst. To synthesize the catalyst, precipitation and sol gel methods have been applied and its characterization was performed using X-ray diffraction XRD, Fourier transform infrared FTIR, transmission electron microscopy TEM, and vibrating sample magnetometer VSM instruments. Effective parameters such as hydrogen peroxide concentration, amount of catalyst, and pH were optimized using response surface method. To analyze the amount of mineralization, the TOC analysis was used. The results showed that at the optimum conditions of [FST] = 85 ppm, [H2O2] = 800 ppm, and pH=7 the process could be mineralize 50 ppm of UDMH solution, about 79% after 120 min.