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Study of Photodegradation Performance and Ability of Lead Removal of Synthesized Maghemite Nanoparticles Using Ziziphus Jujuba Extract


 Today, Water pollutants such as heavy metals and dyes are very important dangers to the nature. Metals such as lead, chromium, mercury and arsenic are examples of heavy metals which are toxic to living things, even sometime at the lowest concentrations. For resolve this challenge, Magnetic nanoparticles are attractive compound because of their advantages such as high efficiency, fast recovery capability, high surface area, easy transportation and inexpensive. We presented an easy and eco-friendly route for the synthesis of iron oxide nanoparticles using Ziziphus jujuba extract. In order to determine the physical, chemical and optical properties of the synthesized samples, Fourier-transform infrared (FT-IR), powder X-ray diffraction (PXRD), vibrating sample magnetometer (VSM), field emission scanning electron microscope (FESEM), energy dispersive X-ray (EDX), transmission electron microscopy (TEM), and Raman analyses were deployed. PXRD results showed that the synthesized nanoparticles have maghemite form of (γ-Fe2O3). FESEM and TEM results demonstrated that the size of these nanoparticles was in range of 20-50 nm, and had spherical shapes. Raman spectrum confirmed the cubic structure of γ-Fe2O3 NPs. Survey of magnetic properties showed that the synthesized maghemite nanoparticles (γ-Fe2O3 NPs) were superparamagnetic. The ability to remove lead from aqueous solution was investigated using these nanoparticles. The results showed that the synthesized nanoparticles were capable of removing 96% of lead at pH = 7 and 1 mg/L loading of nanoparticles. The photocatalytic activity of γ-Fe2O3 NPs was studied on methylene blue (MB) dye; as a result, MB at pH =7 and 1 gr dosage of γ-Fe2O3 had the highest removal percentage (92.8%) during 160 minute using γ-Fe2O3 which calcined at 400 ˚C. The reusability results showed that after four cycles of using the γ-Fe2O3-400, the obtained degradation of methylene blue was about 87.1%. Thus, synthesized γ-Fe2O3 NPs can be a good alternative for removing heavy metals and industrial dyes from contaminated waters.