Screening of silver nanoparticles containing carbonized yeast cells for adsorption of few long-lived active radionuclides

The present study involves the screening of silver nanoparticles containing carbonized yeast cells isolated from coconut cell sap for efficient adsorption of few long lived radionuclides like 137 Cs 55 , 60 Co 27 , 106 Ru 44 , 239 Pu 94 and 241 Am 95 . Yeast cells containing silver nanoparticles produced through biological reduction were subjected to carbonization (400 °C for 1 h) at atmospheric conditions and their properties were analyzed using fourier transform infra-red spectroscopy, X-ray diffraction, scanning electron microscope attached with energy dispersive spectroscopy and transmission electron microscope. The average size of the silver nanoparticles present on the surface of the carbonized silver containing yeast cells (CSY) was 19 ± 9 nm. The carbonized control yeast cells without silver exposure (CCY) did not contain any particles on its surface. The efficiency of CSY and CCY towards the radionuclide adsorption was studied in batch mode at fixed contact time, concentration, and at its native pH. CSY was efficient in removal of 239 Pu 94 (76.75%) and 106 Ru 44 (54.73%) whereas CCY showed efficient removal only for 241 Am 95 (62.89%). Both the adsorbents did not show any retention with respect to 60 Co 27 and 137 Cs 55 . Based on the experimental data, decontamination factor and distribution coefficient ( K d ) were calculated and, from the values, it was observed that these adsorbents have greater potential to adsorb radionuclides.