TY JOUR TI SORPTION PROPERTIES OF 4-VP-HEMA-BTM COMPOSITE TO COPPER(II) IONS KW composite KW sorbent KW 4-vinylpyridine KW 2-hydroxyethyl methacrylate KW N,N-bis(3-triethoxysilylpropyl)thiocarbamide JO Modern Technologies and Scientific and Technological Progress AU Koval, E.T. AU Danilova, A.S. AU Sipkina, E.I. AU Lebedeva, O.V. PY 2026 IS 2026 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»