Iranian Researchers Transform Iron Boring Scraps to Superparamagnetic Nanoparticles

Tuesday, October 2, 2018 - 09:54

Researchers from Isfahan University of Technology have transformed iron boring scraps to superparamagnetic nanoparticles through an aerobic biological route.

According to an ISCA report, the researcher, Majid Daneshvar, M.A student of Isfahan University of Technology, stated that a straightforward, highly efficient, and low-cost biological route was introduced for the synthesis of magnetic nanoparticles.

Based on the research, three urease-positive bacteria namely, Bacillus subtilis, B. pasteurii, and B. licheniformis were used to biosynthesize ammonia and biosurfactants required for the nanoparticle production. Also, the features of the applied biological approach was compared with a chemical co-precipitation method.

X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), dynamic light scattering (DLS), vibrating-sample magnetometer (VSM), and Fourier transform infrared spectroscopy (FTIR) were applied to characterize the synthesized nanoparticles.

Results indicated that the biologically fabricated powders had a single domain structure, and their mean particle size was in the range of 37 to 97 nm. The production capacity of the biological processes was double the chemical method, and the biosynthesized superparamagnetic nanoparticles had higher saturation magnetization up to 132 emu/g.

Finally, the removal of Cr (VI) from a synthetic solution was investigated using the four products. The maximum elimination of chromium (over 99%) was achieved by the particles synthesized by B. pasteurii, with the adsorption capacity of 190 mg/g.

The results of the research, carried out by Majid Daneshvar and Mohammad Raouf Hosseini, faculty member of Isfahan University of Technology, has been published in Journal of hazardous materials.

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