Abstract
In this study, waste cinnamon bark biomass (CB) was investigated as a low-cost and eco-friendly biosorbent for removing cationic methylene blue (MB) dye. CB was also modified with MnO2 (MCB) which has a high surface charge density to increase the adsorption capacity of CB. Adsorption kinetics, isotherms, pH effects, thermodynamics, reusability of sorbents, different water medium effects, and cation/anion effects were studied. The monolayer maximum adsorption capacities of CB and MCB were found as 123.25 mg g−1 (t = 80 min) and 394.56 mg g−1 (t = 20 min) from non-linear Langmuir model, respectively. Characterizations were supported with TGA, elemental analysis, SEM-EDX, BET/N2 surface area, particle size, zeta potential measurements, FTIR and XRD. According to the calculation of the adsorption energy, the MB adsorption on CB and MCB indicates that the physisorption processes have taken place. This result supports the rapid recycling and frequent use of CB and MCB biosorbents.
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