Removal of U (VI) From Aqueous Solution By Effective Bio-Adsorbent From Walnut Shell And Cellulose Composites Stabilized Iron Sulfide Nanoparticle

Abstract FeS nanoparticles were easily aggregated and oxidized in the natural environment due to van der Waals forces between nanoparticles. Biochar could be used as a carrier to inhibit the agglomeration and oxidization of FeS nanoparticles. An efficient bio-adsorbent (CFeS-WS) from walnut shell (WS) and cellulose composites stabilized iron sulfide nanoparticle was synthesized by the modified method. It also was determined by SEM, EDS, XRD and FT-IR, respectively. The removal of U(VI) ions from aqueous solution by CFeS-WS were conducted. The reaction mechanism between CFeS-WS and U(VI) ions also were discussed in details. The experimental results were showed that the biochar successfully was supported with cellulose/FeS composites (CFeS). CFeS-WS exhibited an excellent removal performance for U(VI) ions in solution. The adsorption process of U(VI) ions by CFeS-WS was more consistent with pseudo second-order kinetic model and Langmuir isotherm model. The proposed reaction mechanism of U(VI) ions removal by CFeS-WS mainly consisted of ion exchange reaction, reduction reaction, hydrogen bonding and functional group, and pore of adsorbent filling. Recycle experiment indicated that CFeS-WS was a cost-effective bio-adsorbent.