Ag Doped Hydroxyapatite Nano Particles for Removal of Methyl Red Azo Dye from Aqueous Solutions (Kinetic and Thermodynamic Studies

Abstract

Hydroxyapatite (HA) and Ag doped nano HA (Ca9.8Ag0.2 (PO4)6(OH)2) was prepared by precipitation method. For characterization FTIR, SEM, EDX, BET and XRD methods were used. Adsorption of methyl red (MR) by (HA) and Ag doped nano HA was investigated. Ag doped nano HA had higher adsorption capacity for MR. The pseudo second order model provided better fit to experimental data in the kinetic studies. Based on the sum of squares errors (SSE), the Freundlich isotherm better fits sorption data than the Langmuir equation. The negative values of ΔGº and positive value of ΔHº indicated spontaneous and endothermic adsorption process. The Ag doped nano HA wasreusable sufficient sorbent.