MnO2-loaded microorganism-derived carbon for U(VI) adsorption from aqueous solution
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A low-cost industrial microorganism, Saccharomyces cerevisiae, was employed as a precursor to synthesize carbon/MnO2 composites (MMCs) via an oxidation-reduction reaction and one-step carbonization method for U(VI) adsorption. Scanning electron microscopy and nitrogen adsorption measurement indicated that the microorganism’s carbonization could form surface porous structure and increase the specific surface area. Batch experiments showed that the maximum U(VI) adsorption capacity of MMCs reached 207 mg g−1 at [U(VI)]initial = 25 mg L−1 and pHinitial = 4.5. The obtained thermodynamic and kinetic parameters suggested that the process is endothermic, spontaneous, and chemisorption. FTIR and X-ray photoelectron spectroscopy demonstrated that the surface hydroxyl groups of composites might be the reactive adsorption sites for U(VI). Additionally, 0.5 mol L−1 HNO3 solution could desorb ~ 95% uranium from U(VI)-loaded MMCs, and materials exhibited good regenerated availability. This study suggests that MMCs can be a potential adsorbent for U(VI) preconcentration and removal from radioactive wastewater.
KeywordsSaccharomyces cerevisiae Carbon/MnO2 composites U(VI) Adsorption
We greatly appreciate the financial support from the National Natural Science Foundation of China (Grant Nos. 21876122 and 21876123), the National Fund of China for Fostering Talents in Basic Science (J1210004), and the Joint Funds of National Natural Science Foundation of China and the China Academy of Engineering Physics (NSAF, Grant No. U1330125).