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Adsorption of malachite green (MG) dyes on the mesoporous activated carbon made from the bituminous coal (AC1) and the microporous activated carbon made from coconut shells (AC2) was comparatively studied. Two adsorbents were characterized to study the specific surface area and porosity, surface functionalities, textural morphology, and elemental analysis. Subsequently, the influence of affecting factors on adsorption was evaluated. The highest adsorption capacity was found at initial pH of 4.0–8.0, contact time of 30 min, initial dye concentration of 300 mg/L, and temperature of 30-50 °C. The adsorption of MG dyes on both adsorbents were explained by the Langmuir isotherm with the maximum adsorption capacities of 131.58 mg/g for the AC1 and 54.65 mg/g for the AC2. The adsorption kinetics followed the pseudo-second order reaction model. Although the AC1 has higher MG dye uptake than that of AC2, both are effective adsorbents for MG removal from dye effluents.
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