부산대학교 도서관

This study is focused on evaluating the effectiveness of raw biomass from pomegranate peels (RPP) and its derived biochar (BPP) for the treatment of dye-containing wastewaters through adsorption. Structural and morphological analyses of RPP and BPP were performed using Fourier transform infrared spectroscopy and scanning electron microscopy. The performance of RPP and BPP as adsorbents for indigo carmine (IC) removal was further investigated in batch mode, the maximum experimental adsorption capacity being 77.87 mg g−1 and 290.04 mg g−1, respectively. The equilibrium data was successfully fitted to the Dubinin-Radushkevich model. The kinetic studies showed that the adsorption of IC was well described by the pseudo-second order, suggesting a chemisorption process onto heterogeneous surface. Various thermodynamic parameters, such as ΔG°, ΔH°, and ΔS°, derived from adsorption data over the temperature range 298 and 328 K, accounted for an endothermic and spontaneous process. A possible adsorption mechanism implying π-π interaction and Van der Waals forces was proposed.