Kinetic and equilibrium studies on the removal of Rhodamine B from aqueous solution using Sedr leaf (Spinachristi Zizyphus)

Sedr leaves (Spinachristi Zizyphus) was used as a biosorbent for removal of Rhodamine B, a cationic dye, with batch method. It was found that the adsorption process was rapid and equilibrium attained in 30 minutes. The optimum pH was 2. The results showed the adsorption processes can be correlated with only Langmuir Using the equilibrium concentration constants obtained at different temperatures, various thermodynamic parameters, have been calculated. The amount of ∆H was 70.86 kJ mol-1 that shows adsorption mechanism is endothermic and process is spontaneous because Gibbs free energy changes (∆G) was negative so with increasing the heat, more energy would be available to adsorption increasing. ∆S was +253.41 J mol-1 K -1, so the system has an accidental increase in the share surface solid/solution. Kinetic results showed that removal Rhodamine B process followed pseudo second order model.

کلیدواژه ها:

Rhodamine B ، Removal ، Spinachristi Zizyphus ، Kinetic ، Equilibrium