Comparative assessment for removal of anionic dye from water by different waste-derived biochar vis a vis reusability of generated sludge

Abstract In this study, four biochars prepared from different crop residue waste i.e. sugarcane bagasse (SBB), coconut shell (CNB), paddy straw (PDB), and distilled of lemongrass (LGB) were evaluated for removal Remazol Brilliant Blue R the aqueous system. The RBBR adsorption capacities biochar 97–79% SBB, 99.9–99.47% CNB, 66.1–48% PDB, 78–68% LGB, dominantly controlled by their aromaticity mineral content. Langmuir Freundlich isotherms pseudo-second-order kinetic models have described chemisorption on surfaces. thermodynamic data suggested that was spontaneous endothermic. These demonstrated excellent reusability (till cycles with 50–61% regeneration). purified water dye sludge no phytotoxicity. findings obtained in study may provide supports potential anionic utilization generated zero waste-producing technologies future.