Biochar-immobilized potassium nickel hexacyanoferrate (KNiFC) as a sorbent for removal of radioactive cesium (Cs) from aqueous solutions was prepared using a novel method. Japanese cedar sawdust loaded with NiSO₄ using a ball mill was carbonized at various temperatures. The resultant Ni-loaded biochar was immersed in a K₄[Fe(CN)₆]·3H₂O solution, and biochar-immobilized KNiFC was obtained. For comparison, Ni-loaded biochar was also prepared using the impregnation method. The loading of Ni using the ball mill resulted in a higher Ni amount in the biochar compared with the impregnation method. The carbonization at 400 °C was suitable for Cs adsorption on biochar and synthesis of KNiFC. Consequently, KNiFC immobilization on biochar improved the Cs sorption performance in aqueous solutions with Na⁺, K⁺, Ca²⁺, Mg²⁺, and Cs⁺. The sorption performance was selective in aqueous solutions with radioactive Cs and other cations of high concentration.

使用一种新颖的方法，制备了固定有生物炭的六氰合铁酸钾镍（KNiFC）作为吸附剂，用于从水溶液中去除放射性铯（Cs）。使用球磨机将装有NiSO _4的日本雪松木屑在各种温度下碳化。将所得的载有Ni的生物炭浸入K ₄ [Fe（CN）₆ ]·3H _2中在溶液中，获得了固定有生物炭的KNiFC。为了比较，还使用浸渍方法制备了载有Ni的生物炭。与浸渍法相比，使用球磨机加载的镍导致生物炭中的镍含量更高。400°C的碳化适合于Cs在生物炭上的吸附和KNiFC的合成。因此，固定在生物炭上的KNiFC改善了Na ⁺，K ⁺，Ca 2 ⁺，Mg ²⁺和Cs ^+的水溶液中Cs的吸附性能。在具有放射性Cs和其他高浓度阳离子的水溶液中，吸附性能具有选择性。