ADSORPTIONE REMOVAL OF RED ROSE ANTHOCYANS ON FIBROSE CATION EXCHANGER FIBAN K-1

The search for new accessible sources of anthocyanins is crucial, as these compounds, known for their antioxidant properties and applications in the pharmaceutical and food industries. Red rose petals are promising sources of anthocyanins; however, the adsorption of red rose anthocyanins using the fibrous cation exchanger FIBAN K-1 has not yet been studied. In this study, red rose petals were dried at 303 K and ground to a particle size of approximately 5 mm to ensure uniform extraction conditions. Anthocyanins were extracted from the red rose petals using 0.1 M hydrochloric acid, which effectively extracts and stabilizes anthocyanins. The different factors influencing the adsorption of red rose anthocyanins on FIBAN K-1 were investigated. Specifically, the effects of pH, adsorbent mass, initial anthocyanin concentration, adsorption time, and temperature on the removal efficiency of anthocyanins were examined. Kinetic studies focusing on the effect of temperature on anthocyanin adsorption were carried out at three temperatures (293, 313, and 333 K). The results indicated that anthocyanin adsorption occurred rapidly at first, then gradually slowed after 60 minutes at all temperatures. Experimental kinetic curves for anthocyanin adsorption at different temperatures were analyzed using four kinetic models: pseudo-first order, pseudo-second order, external diffusion, and Weber-Morris intraparticle diffusion models. Among these, the pseudo-second order kinetic model provided the best fit with the experimental data, based on statistical parameters such as the coefficient of determination (R2) and average relative error (ARE). The pseudo-second order rate constants increased with rising temperature. These constants were then used to calculate the activation energy of adsorption, which was found to be 11.5 kJ/mol, indicating that the adsorption of red rose anthocyanins on FIBAN K-1 is a rapid process requiring minimal energy input. It was established that the FIBAN K-1 adsorbent allows for 88% purification of red rose anthocyanins from sugars. The results highlight the potential of FIBAN K-1 as a cost-effective and sustainable adsorbent for anthocyanin removal and purification in industrial applications.