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Lee, Byung-Chul,Oh, Wonzin Korean Radioactive Waste Society 2021 방사성폐기물학회지 Vol.19 No.2
Chemical equilibrium calculations for multicomponent aqueous systems involving the reductive dissolution of magnetite (Fe<sub>3</sub>O<sub>4</sub>) with oxalic acid (H<sub>2</sub>C<sub>2</sub>O<sub>4</sub>) were performed using the HSC Chemistry® version 9. They were conducted with an aqueous solution model based on the Pitzer's approach of one molality aqueous solution. The change in the amounts and activity coefficients of species and ions involved in the reactions as well as the solution pH at equilibrium was calculated while changing the amounts of raw materials (Fe<sub>3</sub>O<sub>4</sub> and H<sub>2</sub>C<sub>2</sub>O<sub>4</sub>) and the system temperature from 25℃ to 125℃. In particular, the conditions under which Fe<sub>3</sub>O<sub>4</sub> is completely dissolved at high temperatures were determined by varying the raw amount of H<sub>2</sub>C<sub>2</sub>O<sub>4</sub> and the temperature for a given raw amount of Fe<sub>3</sub>O<sub>4</sub> fed into the aqueous solution. When the raw amount of H<sub>2</sub>C<sub>2</sub>O<sub>4</sub> added was small for a given raw amount of Fe<sub>3</sub>O<sub>4</sub>, no undissolved Fe<sub>3</sub>O<sub>4</sub> was present in the solution and the pH of the solution increased significantly. The formation of ferrous oxalate complex (FeC<sub>2</sub>O<sub>4</sub>) was observed. The equilibrium amount of FeC<sub>2</sub>O<sub>4</sub> decreased as the raw amount of H<sub>2</sub>C<sub>2</sub>O<sub>4</sub> increased.
Lee, Hyun Kyu,Yang, Da Som,Oh, Wonzin,Choi, Sang-June American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.6
<P>The copper ferrocyanide functionalized core-shell magnetic silica composite (mag@silica-CuFC) was prepared and was found to be easily separated from aqueous solutions by using magnetic field. The synthesized mag@silica-CuFC composite has a high sorption ability of Cs owing to its strong affinity for Cs as well as the high surface area of the supports. Cs sorption on the mag@silica-CuFC composite quickly reached the sorption equilibrium after 2 h of contact time. The effect of the presence of salts with a high concentration of up to 3.5 wt% on the efficiency of Cs sorption onto the composites was also studied. The maximum sorption ability was found to be maintained in the presence of up to 3.5 wt% of NaCl in the solution. Considering these results, the mag@silica-CuFC composite has great potential for use as an effective sorbent for the selective removal of radioactive Cs ions.</P>