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In this study, the feasibility of utilizing Artocarpus odoratissimus skin (“Tarap” skin or TS) as a potential adsorbent for the removal of crystal violet dye was investigated. X-ray fluorescence, Fourier Transform Spectroscopic, and scanning electron microscopic investigation of TS and its NaOH-treated form (NaOH-TS) before and after interaction with crystal violet (CV) cationic dye indicate that the dye shows a strong affinity toward the adsorbent, which is enhanced upon the treatment with a NaOH solution. Decrease in the concentration of metal ions on the TS/NaOH-TS is indicative of the contribution of an ion-exchange mechanism owing to the positive charge of CV molecules. Comparison of experimental adsorption curves with calculated curves point the way toward the agreement with the Langmuir isotherm among the six models tested (Langmuir, Freundlich, Temkin, Dubinin–Radushkevich, Redlich–Peterson, and Sips) under optimized conditions with maximum adsorption capacity of 118 mg g−1 for TS which is...

Artocarpus odoratissimus (Tarap) skin shows great potential as an effective low-cost biosorbent for toxic dyes, methylene blue (MB), and methyl violet 2B (MV). The Langmuir adsorption isotherm leads to the maximum biosorption capacities of this biomass, whose point of zero charge was at pH 4.4, of 0.577 mmol g−1 (184.6 mg g−1) and 0.349 mmol g−1 (137.3 mg g−1) for MB and MV, respectively. The Sips isotherm model is the best fit for adsorption of MB, while both the Langmuir and Sips models are in good agreement for MV. Mass transfer of dye species from solution to the biosorbent phase is fast with 50% dye being removed in less than 1 min following the pseudo-second-order kinetics.