Adsorption of Cd(II) using Polyacrylamide/Rice Husk Hydrogel Farida Laila, Wina Yulianti, Ika Resmeiliana, Novia Amalia Sholeha and Mohammad Fadhlurrahman E3S Web Conf., 454 (2023) 02022 Published online: 29 November 2023 DOI: 10.1051/e3sconf/202345402022