Bottom-Ash–Derived Activated Carbon Hollow Fibers for Dye Wastewater Treatment: Concurrent Decolorization of Acid Blue 93 and Partial COD Reduction

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:This study provides insights into adsorption mechanisms of waste-derived carbon materials for dye removal, useful for material design.

🏢実務担当者:The BAACHF material could be a low-cost alternative for industrial wastewater treatment, though scalability needs assessment.

🏛政策担当者:Supporting waste-to-resource technologies can enhance circular economy policies and reduce environmental burdens from textile wastewater.

Dye-containing wastewater presents a dual removal challenge, contributing not only intense chromophores but also substantial organic loads quantified as Chemical Oxygen Demand (COD). Therefore, effective treatment must simultaneously address both dye decolorization and the removal of dye-derived organic species. In this study, innovative waste-derived Bottom Ash–Activated Carbon Hollow Fibers (BAACHFs) were developed to achieve the concurrent removal of Acid Blue 93 (AB93) and its associated COD. BAACHFs achieved effective decolorization across all tested concentrations, while COD adsorption capacities increased from 0.7 to 4.3 mg g⁻¹ with higher initial dye loadings. Kinetic analysis showed that the pseudo-second-order model provided the best fit for COD uptake, suggesting that the adsorption process may be governed by surface-related interactions rather than mass transfer alone. Equilibrium data were reasonably described by the Temkin and Dubinin–Radushkevich (D–R) isotherms, indicating energetically heterogeneous adsorption sites and an energy-dependent process. Thermodynamic analysis revealed negative ΔH° values and small negative ΔG° values, which approach zero at higher temperatures, indicating an exothermic process with a relatively weak driving force. Characterization results from pH pzc , FTIR, and XPS analyses suggest that multiple interactions may contribute to adsorption, including electrostatic attraction between protonated BAACHF surfaces and anionic AB93, as well as possible hydrogen bonding or surface complexation. Overall, the conversion of incinerator bottom ash into activated carbon hollow fibers provides a promising pathway for resource recovery and wastewater treatment. The ability of BAACHFs to simultaneously reduce color and COD highlights their potential as an alternative adsorbent for dye-containing wastewater, particularly in applications where both visual and organic pollutant removal are required.

• openalex https://doi.org/10.1016/j.hazadv.2026.101317first seen 2026-06-20 05:38:28