Effect of Chelating Agents on Removal of Heavy Metal Cations of Cellulose-based Ion Exchange Resins from Water HyacinthMatcharee Suppapruek, Poonsub Threepopnatkul, Amnard Sittattrakul and Wanchai LerdwijitjarudE3S Web Conf., 302 (2021) 02020DOI: https://doi.org/10.1051/e3sconf/202130202020