The Influence of Different Parameters for the Removal of Pb and Zn Ions on Unmodified Waste Eggshells. - Bran, Elena Petronela; Patriciu, Oana-Irina; Grosu, Luminița; Alexa, Irina-Claudia; Bălănucă, Brîndușa; Nicoară, Adrian-Ionuț; Fînaru, Adriana-Luminița (Materials (1996-1944), 2025)