Purification of model solutions from copper(2+) ions with aqueous extracts from hydrolysates of protein-containing keratinTogaymurot Aliev, Feruza Raximova, Kakhramon Husenov, Zokir Karimov, Dilshod Akhtamov and Ozoda BakhranovaE3S Web Conf., 548 (2024) 08006DOI: https://doi.org/10.1051/e3sconf/202454808006