| Abstrakt: |
The current investigation demonstrates the efficacy of activated carbon derived from tea waste (ACTW) as a potent adsorbent for the elimination of rhodamine B (Rh-B), a cationic dye, from water. Several factors, including initial Rh-B concentration, solution pH, temperature, and contact time, were scrutinized to evaluate their impact on the adsorption process. Furthermore, attempts were made to establish a correlation between the isothermal data obtained through the application of the Langmuir, Freundlich, and Temkin equations. Kinetic modeling using pseudo-first-order and pseudo-second-order rate parameters was utilized to scrutinize the rate of the adsorption process. The data obtained were found to conform to the pseudo-second-order kinetic model. With the increase in the ACTW (adsorbate) dosage from 0.2 g to 1.8 g, the removal of Rh-B dye escalated from 76 to 97.8%. In contrast, the adsorption capacity decreased from 10.1 to 2.2 mg/g. Fourier-transform infraredspectra of ACTW illustrated humps located at 2927 cm−1 and 2480 cm−1, which correspond to alkane and alkene groups (C–H stretching of CH2 groups). Microstructural analysis of ACTW revealed porous granules with shattered surfaces. Thermodynamic parameters indicated that the adsorption process was spontaneous (ΔG° = negative) and endothermic (ΔH° = positive). The findings suggest that ACTW is an effective and potential adsorbent for removing Rh-B dye from aqueous solutions. Furthermore, the results of the study indicate that tea waste is a cost-effective and efficient absorbent for removing cationic dyes from aqueous solutions. [ABSTRACT FROM AUTHOR] |
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