| Abstrakt: |
This present work was aimed at evaluating the adsorptive properties of banana peel adsorbents, namely chars, hydrochar, activated carbons, and hydrochar activated carbon. The adsorbents were characterized for textural properties, functional groups, and morphology, and the adsorption was performed at varying contact time, concentrations, and temperatures. Hydrochar activated carbon yields an 877 m2/g specific surface area with dye maximum capacity of 582 mg/g at equilibrium concentration of 446 mg/L. Its fragmented surface allows more dye molecules to lodge although the effective diffusion coefficient is small compared to the other banana peel adsorbents. The Langmuir–Freundlich model appeared to fit the equilibrium data well with R2 of 0.988, while the kinetic obeyed the pseudo-second-order model with R2 > 0.914. There is only a slight rise in adsorption with increasing temperature and regeneration using HCl was unable to reclaim the adsorbents' performance. [ABSTRACT FROM AUTHOR] |
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