TY JOUR TI DETERMINATION OF THE SUBSTANTIAL COMPOSITION AND SORPTION PROPERTIES OF CLAYS OF THE GERPEGEZHSKOYE DEPOSIT KW Gerpegezha clay KW material composition KW adsorption KW adsorption rate KW water purification KW heavy metals KW copper ions. JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Vezentsev, A.I. AU Efendiev, B.S. AU Shaydorova, G.M. AU Nesterova, L.L. PY 2025 IS 10 PB Belgorod State Technological University named after V.G. Shukhov