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137Cs and 90Sr 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 Sr2+ 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...