PHYSICO-CHEMICAL PROPERTIES AND CRYSTAL VIOLET ADSORPTION PERFORMANCES OF H₃PO₄ - MODIFIED MANGO SEEDS KERNEL
Keywords:
H₃PO₄-modified mango seeds kernel, adsorption, Crystal Violet, kinetics, equilibrium, thermodynamicsAbstract
This study investigated the removal of Crystal Violet (CV) from aqueous solutions using H3PO4-modified mango seeds kernel (H3PO4-MSK). The adsorbent was characterized using elemental analysis, thermal analysis (TGA), scanning electron microscopy (SEM), specific surface area and pore size distribution (BET) and Fourier Transformed Infrared Analysis (FTIR). X-ray diffraction (XRD) analysis showed that H3PO4-MSK is a type II cellulose crystal structure, while SEM and BET analysis confirmed the macroporosity of the adsorbent. The removal efficiency of CV increased with an increase in adsorbent quantity and temperature. The adsorption capacities increased from 23.94 to 87.23 mg/g for an increase in temperature from 30 to 50oC. Adsorption kinetics analysis indicated that pseudo-second-order and Elovich equations fitted very well the adsorption of CV onto H3PO4-MSK. The adsorption process followed the Temkin and Langmuir isotherm models. Isotherm modelling showed that CV is loosely bound to H3PO4-MSK. Further thermodynamic analysis revealed that the removal of CV from aqueous solution by H3PO4-MSK was a spontaneous and endothermic process. The proposed adsorption mechanism involves -OH, -NH2 and -COOH groups from the H3PO4-MSK surface.
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