Isotherms, thermodynamics and kinetics of rhodamine B dye adsorption on natural diatomite

Tóm tắt

In this paper, Phu Yen diatomite was used as adsorbent for adsorption rhodamine B (RB) dye in aqueous solution. Analysis methods, including SEM, XRD, FT-IR, and N₂ adsorption-desorption isotherms, were used to characterise the adsorbent. The analysis of experimental adsorption data showed that the adsorption followed Langmuir isotherm model and pseudo-second-order kinetic equation. Based on the adsorption constant in the Langmuir isotherm (K_L), thermodynamic parameters (DG^o, DH^o and DS^o) for adsorption of RB onto the diatomite were calculated. The results indicated that the process is spontaneous and endothermic in nature.