Perspectives of Biochar-Aided Advanced Oxidation Processes for the Remediation of Emerging Dyeing Contaminants

Abstract Biochar-aided Advanced Oxidation Processes (BC-AOPs) have emerged as a novel and promising method for degrading wide organic contaminants in water and wastewater treatment. In this investigation, the principles, processes, and possible applications of BC-AOPs are highlighted. AOPs produce highly reactive oxygen species (ROS), such as hydroxyl radicals (•OH), to oxidize and mineralize organic contaminants. Biochar, a carbonaceous material derived from biomass pyrolysis, serves as a catalyst or support in AOPs, enhancing their efficiency and stability. Biochar distinctive physicochemical features, such as large pore volumes, functional groups, and high surface area, contribute to its catalytic role in enhancing OH production. The combination of biochar and AOPs creates synergistic effects, enabling the degradation of a wide range of recalcitrant dyeing contaminants, inclusive of many industries. BC-AOPs offer several advantages, including low-cost materials, versatility, and the potential for sustainable synthesis through the utilization of various biomass residues. However, challenges remain in optimizing biochar characteristics, understanding reaction kinetics, and evaluating the long-term stability and reusability of biochar in AOPs. BC-AOPs hold significant promise as an effective and environmentally friendly technology for water and wastewater treatment, contributing to the mitigation of water pollution and ensuring water resource sustainability.