Synthesis, characterization, and application of Fe₃O₄/PEG/HAp nanocomposite as an adsorbent for Pb(II)Dewinta Yuka Siwi, Anugrah Ricky Wijaya, Neena Zakia and Nor Kartini Abu BakarE3S Web Conf., 695 (2026) 02008DOI: https://doi.org/10.1051/e3sconf/202669502008