Enhanced U(VI) elimination from aqueous solution by FeS@biochar composites

Abstract

Iron sulfide nanoparticles were thought to be a potential material for U(VI) removal from aqueous solution. In order to overcome its aggregation and enhance removal capacity, biochar derived from peanut shell was chosen to support iron sulfide nanoparticles. The biochar supported iron sulfide nanoparticle composites (FeS@biochar) were prepared and applied for removal of U(VI) from aqueous solutions. The uptake capacity of U(VI) reached 59.52 mg/g at pH = 5.12 and 298 K, and it was indicated that the biochar supported with FeS significantly enhanced removal efficiency of U(VI). Based on scanning electron microscopy, X-ray diffraction, electronic differential system, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy analyses, it could be concluded that mechanism of removal of U(VI) ions by FeS@biochar was reductive reaction, electrostatic attraction and surface complexation. According to its high efficiency, reusability, and chemical stability, FeS@biochar can be considered in environmental remediation as a low cost and potential adsorbent for removal of U(VI) from aqueous solution.