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Membrane Water Treatment
  Volume 15, Number 2, July 2024 , pages 067-78
DOI: https://doi.org/10.12989/mwt.2024.15.2.067
 


Application of nickel hexacyanoferrate and manganese dioxide-polyacrylonitrile (NM–PAN) for the removal of Co2+, Sr2+ and Cs+ from radioactive wastewater
Md Abdullah Al Masud and Won Sik Shin

 
Abstract
    In this study, a nickel hexacyanoferrate and manganese dioxide-polyacrylonitrile (NM–PAN) composite was synthesized and used for the sorptive removal of Co2+, Sr2+, and Cs+ in radioactive laundry wastewater. Single- and multi-solute competitive sorptions onto NM–PAN were investigated. The Freundlich (Fr), Langmuir (Lang), Kargi–Ozmihci (K–O), Koble–Corrigan (K–C), and Langmuir–Freundlich (Lang-Fr) models satisfactorily predicted all the single sorption data. The sorption isotherms were nonlinearly favorable (Freundlich coefficient, NF = 0.385–0.426). Cs+ has the highest maximum sorption capacity (qmL = 0.855 mmol g–1) for NM-PAN compared to Co2+ and Sr2+, wherein the primary mechanism was the physical process (mainly ion-exchange). The competition between the metal ions in the binary and ternary systems reduced the respective sorption capacities. Binary and ternary sorption models, such as the ideal adsorbed solution theory (IAST) model coupled with single sorption models of IAST–Fr, IAST–K–O, IAST–K–C and IAST–Lang–Fr, were fitted to the experimental data; among these, the IAST–Freundlich model showed the most satisfactory prediction for the binary and ternary systems. The presence of cationic surfactants highly affected the sorption on NM-PAN due to the increase in distribution coefficients (Kd) of Co2+ and Cs+.
 
Key Words
    IAST; multi-solute sorption; NM–PAN; radioactive; wastewater
 
Address
Md Abdullah Al Masud and Won Sik Shin: School of Architecture, Civil, Environmental, and Energy Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
 

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