In the current study,the hierarchical LDHs platelets on surface of carbon fibers in a closed hydrothermal system.Utilizing the thermal decomposition of LDHs,nanostructured MgAl2O4 spinel platelets generate on the surface of carbon fibers,forming the hierarchical MgAl2O4 spinel/carbon fiber composites.Our study can be extended for the preparation of other hierarchical spinel/carbon fiber composites with controllable surface structures for applications in separation,adsorption and catalysis