Effect Of Solution Medium And Temperature On The Sorption Of Silver Ions By Impregnated Sorbents

Abstract

The influence of the medium’s acidity and temperature on the sorption of silver ions by impregnated polymer sorbents was investigated. The sorption process was studied in the pH range of 1–12 using PAD400, PAD600, and FK-based sorbents modified with chelating ligands such as MAB, Dtz, and DEDTK. The results demonstrated that the sorption efficiency strongly depends on the acidity of the solution, with maximum sorption observed at pH = 3. The kinetics of silver ion sorption were analyzed using pseudo-first-order, pseudo-second-order, and intra-particle diffusion models. Experimental data showed that the sorption process reaches equilibrium within 60 minutes. Comparison of the kinetic parameters revealed that the pseudo-second-order model best describes the sorption process for all sorbents, with correlation coefficients (R² > 0.99) and calculated equilibrium capacities (Qₑ,calc) consistent with experimental data (Qₑ,obs). These findings indicate that the rate-limiting step of the sorption process is the surface chemical reaction between the functional groups of the sorbent and silver ions.