Efficient removal of 110mAg nanoparticles (110mAg Nps) in nuclear wastewater by Amines-containing anionic adsorbent PP-g-GMA@EDA
110m Ag nanoparticles ( 110m Ag Nps) is a radioactive contaminant in the process wastewater of nuclear power plants. In this study, the novel material containing amines PP-g-GMA@EDA as the adsorbent is proposed for the removal Ag Nps. PP-g-GMA@EDA is synthesized by γ ray-induced simultaneous irradiation grafting and its removal performances for Ag Nps from aqueous solutions has been studied. In Ag Nps solution at different pH values, PP-g-GMA@EDA possesses better removal efficiency than the commercial resin IRN9766 commonly used in nuclear power plants, especially at pH 4. XPS helps confirm that the adsorption mechanism is mainly ion exchange to negatively-charged Ag Nps by protonated secondary amines on the adsorbent. At the optimal pH 4, the effects of different parameters such as the initial Ag Nps concentration, the ratio of adsorbent dosage to solution volume and the adsorption time on adsorption performances are considered. 100% adsorption efficiency of Ag Nps can be achieved and the maximum adsorption capacity is 101.44 mg/g. The Langmiur isotherm model and the pseudo-first-order kinetic model better describe the adsoption process. In the simulated nuclear power plant process wastewater, even though the concentration of competitive ions is 40 times that of Ag Nps, the removal efficiencies still maintain above 85%. In addition, 5 wt% ammonia water can effectively desorb Ag Nps from the used adsorbent to ensure the recyclability of PP-g-GMA@EDA. The well designed adsorbent with excellent removal efficiency and selectivity provides a very efficient, sustainable, and industrially feasible way for Ag Nps decontamination from nuclear wastewater.
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