Carbon-mineral adsorbents (CMA) were prepared using complex diatomaceous earth/perlite adsorbent spent in purification of apple juice and carbonized with addition of starch or glucose to enhance the content of carbon deposits and to develop the porosity of the CMA. The specific surface area of the carbon deposits was 500-640 m2/g at the pore volume Vp = 0.28-0.35 cm3/g depending on the type of an additive and the amounts of grafted carbon. Carbon deposits in CMA represent nanoparticles (nanodeposits) totally covering a surface of the mineral matrix. Thermal stability of these nanoparticles is lower than that of larger microparticles of activated carbon (AC) or carbon black. Contribution of aromatic structures with C atoms with the sp2 hybridization is larger in CMA than AC but smaller than in graphitized carbon black.