Keywords1. Introduction2. Experimental2.1. Materials2.2. Synthesis2.3. Measurement and characterization2.4. Leaching test and elements migration test2.5. Heavy metal removal test3. Results and discussion3.1. Structural and morphological changes under different reaction conditions3.2. BET surface area3.3. Conversion3.4. Migration of heavy metals3.4.1. Toxic heavy metals3.4.2. Other heavy metals3.4.3. Migration of heavy metals3.5. Strontium and caesium removal4. ConclusionsAcknowledgementAppendix A. Supplementary dataReferences