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Bagasse fly ash was converted into an inexpensive adsorbent and utilized for the removal of β-naphthalenesulfonic acid in dilute solution. The effect of pH, temperature, adsorbent concentration, and co-existed acids on the removal ofβ-naphthalenesulfonic acid was examined. The adsorption data have been correlated with both Langmuir and Freundlich adsorption models. Thermodynamic parameters obtained indicate the feasibility of the process, and kinetic studies provided the necessary mechanistic information of the removal process.