Study on Adsorptive Performance of Jackfruit Peel on Methylene Blue

This paper mainly focuses on the absorptive properties of Jackfruit Peel on methylene Blue. The raw jackfruit peel was prepared as adsorbent powder by crush. It showed that the optimal adsorption conditions in 100 mL 100 mg/L methylene solution were as follow:The dosage of jackfruit peel powder at 0.8 g was perfect condition with the pH5, the temperature 25 ℃,and the shaking time 40 minutes. The quasi-first-order and quasi-second-order kinetic equations were used to simulate the kinetics process of the adsorption of methylene blue on the jackfruit peel,and the Freundlich and Langmuir equations were used to simulated the thermodynamic behavior. The results also showed that the pseudo-second kinetic equation and the Freundlich equa-tion were suitable for describing of the whole adsorption process. The thermodynamic parameters of Gibbs free energy(ΔG⁰), enthalpy(ΔH⁰)and entropy change(ΔS⁰)were calculated and results were as follow:In the process of Jackfruit Peel powder adsorption of methylene blue,the value of ΔG⁰,ΔS⁰,and ΔH⁰ were kept as:ΔG⁰<0,ΔH⁰<0 and ΔS⁰<0,which indicated that it was a spontaneous,orderly and exothermic process. The surface of the jackfruit peel were analyzed both before and after the process of adsorption. It found that the surface of the jackfruit peel was filled by methylene blue,which was resulted in the shape changing.