The waste soot particles emitted from a diesel engine were studied as a dye adsorbent for water treatment. The input parameters were optimized using response surface methodology to achieve the maximum removal of dye methylene blue (MB). Experiments were conducted according to three‐level Box–Behnken Design with three factors time, pH, and initial concentration of dye in the solution. Further, analysis of variance analysis was carried out to find the level of significance of each parameter toward dye removal. Finally, for 0.05 g of diesel soot in a 50 ml solution, the maximum dye removal predicted was more than 99%. The basic medium (pH 12) found was favorable for the adsorption of MB. Also, 96% of detergent was removed in 60 min. Langmuir isotherm model and Pseudo‐second‐order kinetic model were most suitable for equilibrium and kinetic studies, respectively, for the removal of MB on diesel exhaust emission soot.

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