Author:
Zuba Iga,Pawlukojć Andrzej
Abstract
AbstractCore–shell magnetic adsorbent Fe3O4@MnO2 was prepared and successfully used to ruthenium adsorption from aqueous solutions with 98% efficiency. The adsorption isotherms, kinetic and thermodynamic parameters for Ru(III) sorption onto Fe3O4@MnO2 were studied via a batch adsorption system. Adsorption isotherm models such as: Langmuir, Freundlich and Temkin were tested while the kinetic adsorption data were analyzed by pseudo-first order, pseudo-second order, and Weber-Morris models. It has been found that the adsorption process of Ru(III) onto Fe3O4@MnO2 can be describe by a Freundlich model whereas mechanism of sorption is presented better by kinetic Weber–Morris model. Freundlich adsorption isotherm constant is equal Kf = 30.62 mg/g and heterogenity factor n = 3.58. Sorption rate constant is k3 = 0.288 mg/(g·min1/2) and intraparticle diffusion rate constant C = 0.174 mg/g. Thermodynamic parameters such as free Gibb’s energy change (ΔG°), enthalpy change (ΔH°), entropy change (ΔS°) and energy activation Ea were determined. Calculated value of activation energy is equal 25.75 kJ/mol. The adsorption process of Ru(III) was found to be both spontaneous and thermodynamically preferable.
Publisher
Springer Science and Business Media LLC
Reference63 articles.
1. P.K. Verma, P.K. Mohapatra, Ruthenium speciation in radioactive wastes and state of the art strategies for its recovery: A review, Separation and Purification Technology (275), 119148 (2021)
2. S.F. Mobbs, M.P. Harvey, J.S. Martin, A. Mayall, M.E. Jones, Comparison of the waste management aspects of spent fuel disposal and reprocessing; post disposal radiological impact, NRPB report EUR 13561 EN, UK (1991)
3. A. Ramanujam, Partitioning of actinides from high level waste of PUREX origin using octylphenyl-N-N0 -diisobutylcarbomoylmethyl phosphine oxide (CMPO) based supported liquid membrane. Sep. Sci. Technol. 34, 1717 (1999)
4. S.A. Ansari, P.N. Pathak, V.K. Manchanda, M. Husein, A.K. Prasad, V.S. Parmar, N, N, N’, N’ Tetraoctyl Digllycolamide (TODGA): a promising extractant for actinide—partitioning from high level waste (HLW). Solvent Extr. Ion Exch. 23, 463 (2005)
5. International Atomic Energy Agency, Chemical durability and related properties of solidified high level waste forms. Technical Reports Series, No. 257, IAEA, Vienna, (1985)