Adsorption Performance for Ag(I) of an Ethoxycarbonyl Thiourea Chelating Resin

摘要

Effects of initial concentration of Ag(I), concentration of HNO_3, contact time and adsorption temperature on adsorption capacities of a novel polystyrene modified ethoxycarbonyl thiourea resin were investigated, and the maximum adsorption capacity of Ag(I) reached 4.11 mmol·g~(-1). The adsorption kinetics was well fitted Boyd's diffusion equation of liquid film, so the adsorption was controlled by liquid film diffusion. The experimental date fitted Langmuir equation, and the correlation coefficient was close to 1. The positive value of adsorption enthalpy ΔH is indicative of an endothermic process. FT-IR characteristic peaks of ethoxycarbonyl and thiourea groups changed obviously fore-and-aft adsorption, which means that the corresponding functional groups coordinate with Ag during the adsorption process.