Study on preparation of NiCo Prussian blue analogue hollow nanobubbles and their Cs+adsorption properties
The efficient separation of cesium ions(Cs+)is significant in resource utilization and ecological security.Develop-ing an adsorbent for Cs+with high capacity and selectivity is challenging.In this work,nickel cobalt Prussian blue analog(NiCo-PBA)hollow nanobubble adsorbent(NiCo-PBA HNB)was successfully synthesized using a prism-shaped tetrago-nal cobalt nickel acetate precursor as a template using a self-template method to remove cesium ions(Cs+)from aqueous so-lutions effectively.The NiCo-PBA HNB was characterized by Fourier transform infrared spectroscopy(FT-IR),X-ray dif-fraction(XRD),transmission electron microscopy(TEM),and energy dispersive spectroscopy(EDS).NiCo-PBA HNB had a high specific surface area(195.09 m2/g)and a uniform mesoporous structure(10.21 nm).Thanks to its unique nanostruc-ture and pore characteristics,NiCo-PBA HNB could reach adsorption equilibrium within 30 minutes,with a maximum ad-sorption capacity of 317.59 mg/g,and the adsorption process conformed to a quasi-second-order kinetic model.Even in high concentrations of K+(0.1 mol/L),the distribution coefficient(8.82×103 mL/g)remained at a high level.In addition,the ad-sorption mechanism of NiCo-PBA HNB mainly involved ion exchange between K+in the crystal and Cs+in the solution.
self template methodnickel cobalt prussian blue analoguehollow bubble structurecesium adsorbent