Abstract
In this work, nanobentonite clay has been activated with H2SO4 to produce (A-NBent) nanosorbent to increase its adsorption efficiency toward divalent Co/Zn and their radionuclides60Co/65Zn via batch and column techniques. A-NBent was characterized by the FT-IR, TGA, XRD, SEM, and HR-TEM studies. The HR-TEM analysis confirmed particle size in the range between 11.37–19.78 nm. The adsorptive efficiency of A-NBent was evaluated by divergent parameters as pH, reaction time, solid amount and ionic concentration to obtain the perfect conditions. The adsorption isotherms and kinetic studies were investigated via different models and the kinetic of adsorption process was favorable by the pseudo-second order model. A-NBent nanosorbent exhibited the highest ion capacities at pH 6–7 and reaction time 20−30 min for Co/Zn ions. It was concluded that A-NBent behaved as an efficient nanosorbent for Co/Zn ions from aqueous solution, with maxima removal 125.27 mg/g for Co and 142.18 mg/g for Zn. This behavior is referred to the high surface area of A-NBent nanosorbent (349.2 m²/g) and high number of the activated sites resulted by the activation process with H2SO4. Finally, the packed micro-column system with A-NBent nanosorbent was applied for remediation of 60Co/65Zn from nuclear wastewater and the recovery values were concluded > 90 %.
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