Cs and Sr are hazardous to ecological environment and human health due to their strong radioactivity, long half-life, and high mobility. However, effective adsorption and separation of Cs and Sr from acidic radioactive wastewater is challenging due to stability issues of material and the strong competition of protons. Herein, a K -activated niobium germanate (K-NGH-1) presents efficient Cs /Sr coadsorption and highly selective Cs /Sr separation, respectively, under different acidity conditions.
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