Parameters of lead sorption by man-made sand

The article describes the lead sorption by man-made sand carried out under static conditions in the territory of the former Dzhida tungsten-molybdenum plant (the Republic of Buryatia). In the adsorption experiment we have used a series of suspensions, from which aliquots were taken at fixed time intervals to determine the concentration of lead ions in them by atomic emission spectrometry. The main parameters of the Langrum and Freindlich equations are determined. It has been established that the Langrum model describes the sorption of lead ions by the studied sand with a good approximation coefficient. The calculated parameters of lead sorption make it possible to quantify the absorption capacity of sand. The data obtained show the ability of sand to absorb and deposit up technology-related emissions of lead to 80% when its concentration in the initial solution is not more than 0.5 mmol • l-1. Lead ions sorption by industrial sand proceeds quickly, equilibrium is reached after 24 hours of contact. The main part of the absorbed lead ions (about 7.77-98.85%) passes from solution to sand during the first 30 minutes of interaction, depending on its initial concentration in the solution. The lead sorption rate is variable and maximal for the first few minutes. The second pseudoorder kinetic model describes the sorption of lead ions by the studied sand with a good approximation coefficient (R2 = 0.9918-1.0). From the dependence of this equation we can conclude that the sorption of lead ions is limited by the stage of a chemical reaction.