Synthesis and physico-chemical characterization of cellulose/HO 7 Sb 3 nanocomposite as adsorbent for the removal of some radionuclides from aqueous solutions

Novel organic-inorganic nanocomposite cellulose/HO Sb was prepared chemically by sol-gel mixing of organic poly cellulose into inorganic Sb(OH) . The prepared nanocomposite was used as an adsorbent for the adsorption of La (III), Co (II) and Cs (I) from aqueous solutions. The adsorbent was characterized by XRD, FTIR, TEM, SEM and TGA. TEM analysis of cellulose/HO Sb shows some dispersed HO Sb particles in the cellulose matrix; having spherical shapes with different sizes with average particle size less than 21 nm. Furthermore, XRD and FTIR analysis confirm the formation of HO Sb structure on poly-crystalline cellulose. The synthesized cellulose/HO Sb demonstrated bifunctional ion-exchange groups (C-OH and Sb-OH) appearing in the FTIR absorption bands at about 1061 and 560 cm , respectively. The impacts of various adsorption parameters such as contact time, pH, initial metal concentrations, the amount of cellulose/HO Sb nanoparticles, competing ions and complexing agent and reaction temperature were investigated using batch adsorption experiments. In terms of saturation capacity, this hybrid material retained about 80.05% of the initial saturation capacity when it irradiated by γ-radiation with dose = 50 kGy, at 150 kGy, sharp capacity loss (~ 96%) was observed. Cellulose/HO Sb exhibits selectivity for La (III), Co (II) and Cs (I) in the order of La > Co > Cs . The changes in the values of free energy (ΔG°) and enthalpy (ΔH°) indicate the spontaneous, feasible and endothermic nature of the sorption process. Radiometric data shows high removal and decontamination efficiency of the prepared nanocomposite especially for La-140 and Co-60. While, Cs-137 removal is less than the other radionuclides.