Intercalation Zn/Cr Layered Double Hydroxides with K3[𝛼-PW12O40]nH2O and K4[𝛼-SiW12O40]nH2O as Adsorbent of Rhodamine-B

Abstract


 
 
 
 Synthesis of Zn-Cr layered double hydroxide intercalated with polyoxometalate K3[𝛼-PW12O40]nH2O and K4[𝛼- SiW12O40]nH2O was conducted successfully. The characterization of layered double hydroxide intercalated was performed using XRD and FT-IR analyses. After that layered double hydroxide intercalated used as an adsorbent of rhodamine B (RhB) dye. The results show Rhodamine-B (RhB) more effective adsorbed using the Zn-Cr adsorbent K3[𝛼-PW12O40]nH2O than using an intercalated adsorbent K4[𝛼-SiW12O40]nH2O because the distance between the layers is smaller. Study of kinetics showed that the adsorption process is more fits with PSO than PFO based on coefficients correlation. The adsorption process described by Langmuir isotherm models for all adsorbent. The value of enthalpy and entropy shows that the adsorption process was endothermic and negative free energy value was indicated that the process was spontaneous.