Kinetics and Thermodynamics of Forchlorfenuron Biosorption from Kiwifruit Juice by Inactivated Yeast Biomass
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Abstract:
Inactivated yeast biomass was used as the adsorbent for batch biosorption experiments to study the kinetics and thermodynamics of biosorption of forchlorfenuron from kiwifruit juice. First, the pseudo-first-order kinetics model, pseudo-second-order kinetics model, intra-particle diffusion equation, and Elovich equation were used to fit the biosorption kinetics process. Then, Langmuir isotherm model, Freundlich isotherm model, Temkin isotherm model, and Dubinin–Radushkevich isotherm model were employed to analyze the biosorption thermodynamic characteristics. The results showed that biosorption kinetics was best described by the pseudo-second-order model, indicating that chemical biosorption was the rate-limiting step. The equilibrium data fitted well with the Freundlich model when the forchlorfenuron concentration ranged from 0.5 to 10 μg/mL, which revealed that the biosorption of forchlorfenuron by inactivated yeast biomass was not an ideal monomolecular layer adsorption. The thermodynamic parameters △G, △H, and △S were negative within the temperature range of 293 to 310 K, showing that the biosorption is spontaneous, exothermic, and accompanied by a decrease in entropy. Additionally, the biosorption of forchlorfenuron by inactivated yeast biomass was more favorable at lower temperatures.
