Comprehensive critical reassessment of equilibrium, kinetic, statistical, and mechanistic frameworks in “Dual-driven magnetic nanocomposites enabling universal adsorption of perfluorocarboxylic acids (PFCAs) across ultrashort to long chains. https://doi.org/10.1016/j.jcis.2026.140139”

Zhao et al. reported a magnetic Fe 3 O 4 /SiO 2 nanocomposite bearing amino, p-aminobenzoic-acid-derived, and C-18 functionalities for adsorption of three perfluorocarboxylic acids (PFCAs): trifluoroacetic acid (TFA), perfluoroheptanoic acid (PFHpA), and perfluorononanoic acid (PFNA). This commentary reassesses the equilibrium design, kinetic and isotherm modeling, multicomponent mass balance, molecular calculations, chemical assignments, and implications for scale-up. The main experimental limitation is that the concentration series treated as equilibrium isotherms was sampled after 10 min, although nonlinear kinetic reanalysis gives t 0.95 values of 17.19, 32.42, and 15.31 min for TFA, PFHpA, and PFNA, respectively. Reanalysis of 14 digitized kinetic points shows that fractal-like pseudo-first-order (FL-PFO) has the lowest Bayesian information criterion (BIC) for all three PFCAs, contradicting the blanket pseudo-second-order (PSO) assignment. Nonlinear fitting of the transient concentration-response data favors Liu for TFA, Langmuir for PFHpA, and Liu for PFNA, although PFHpA and PFNA do not show decisive Langmuir-versus-Liu differences. The reported Dubinin-Radushkevich formulation is dimensionally undefined, and its energetic criterion is not mechanistically diagnostic. Several binary and ternary adsorption capacities also exceed the mass-balance ceiling under the concentration basis stated in the Supporting Information. Molecular simulations use apparently inappropriate PFCA protonation states, incomplete computational specifications, and an incorrect Einstein diffusion expression. Structural drawings, reagent identities, spectroscopic assignments, and synthesis descriptions contain additional inconsistencies affecting reproducibility. The material remains a useful proof of concept across three PFCA chain lengths, but equilibrium, synergistic, mechanistic, “ universal-adsorption ”, and scale-up claims require verified equilibration, closed mass balances, dimensionally valid models, realistic molecular speciation, and corrected chemical reporting.