R. Erlangga, D. A. Sari, and A. Wahyuningtyas, “Characterization of Eichhornia crassipes bio-adsorbent activated by H3PO4 for the removal of lead ion (Pb2+) from wastewater of battery industry”, Sinergi, vol. 29, no. 2, pp. 279–286, May 2025.