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As an extension to successful adsorption of malachite green dye onto Artocarpus odoratissimus (Tarap) leaves, the surface of the leaves was modified by using a strong base, namely sodium hydroxide (NaOH). The isotherm was best fitted to the Redlich–Peterson model. Based on monolayer adsorption using Langmuir model, the q m a x value of Tarap leaves enhanced from 254.9 to 422.0 mg/g upon the modification, and increased by 3 fold when using the Sips model. This paper provided a better insight on the types of reactions that occurred during the adsorption process and the strength of attractions between adsorbent–adsorbate supported with the aid of multiple characterization methods. Other influencing parameters on adsorption such as contact time, ionic strength, pH, temperature and initial dye concentrations were also studied.