Investigating the Optimization of Magnetic Biochar Production from Rubber Seed Shells for Enhanced Cr(VI) Removal EfficiencyYasumin Prangmoo, Orasa Choolaaied, Naree Phanchindawan, Warunee Limmun and Thatchapol ChungcharoenE3S Web Conf., 514 (2024) 02002DOI: https://doi.org/10.1051/e3sconf/202451402002