Efficient adsorption of anionic azo dyes on porous heterostructured MXene/biomass activated carbon composites: Experiments, characterization, and theoretical analysis via advanced statistical physics models

•MXene doped composite CMAC was prepared by ultrasound–assisted electrostatic self–assembly.•CMAC exhibited high adsorption performance for the tested three anionic dyes.•Classical models and ASPM were both applied to elucidate the adsorption mechanism.•The adsorption mechanism was the synergistic effect of physicochemical interactions.