Magnetic Hydroxyapatite for Batch Adsorption of Heavy Metals Khee Chung Hui, Norashikin Ahmad Kamal, Nonni Soraya Sambudi and Muhammad Roil Bilad E3S Web Conf., 287 (2021) 04005 Published online: 06 July 2021 DOI: 10.1051/e3sconf/202128704005