Increasing attention has been paid to radioactive wastewater to direct discharge in Japan or accidental leaks. Strontium-90 (Sr) and Cobalt-60 (Co) are the most hazardous nuclides in waste discharged form nuclear reactors. Because of their high solubility and long half-lives, these radioisotopes can persist for hundreds of years before decaying to negligible levels. Herein, a green and biodegradable material nanoscale zero-valent iron (nZVI) supported by bacterial cellulose particles (BCP-nZVI) is constructed for the first time to adsorb Co and Sr in single and binary systems. BCP-nZVI shows superior adsorption capacities of Co and Srin a single system within a wide range of pH values from 5 to 7, while the coexistence of Co adsorption inhibits the Sr in binary system. Pseudo-second-order dynamics model and Langmuir isothermal model can be indicated the BCP-nZVI adsorption progress with 107.10 mg/g (Co) and 64.96 mg/g (Sr) maximum adsorption capacity. BCP-nZVI has outstanding stability, allowing it to be stored for more than one month with compromising its performance. More importantly, BCP-nZVI exhibits exceptional removal efficiency of Co(92.53 %) and Sr(58.62 %) removal in natural seawater systems. The mechanism investigation illustrates the high adsorption capacity of BCP-nZVI for Co is controlled by redox and hydroxyl complexation. While Sr is controlled by hydroxyl complexed adsorption, thus it has weak against interference by cations like Na, Ca, etc. BCP-nZVI exhibits the advantages of high adsorption capacity, wide pH range, strong stability, and good applicability in natural seawater, which has excellent potential for application in radioactive ions removal.
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