Analysis of kinetic and equilibrium adsorption of heavy metals by natural materials

Abstract

Abstract One of the effective methods of cleaning up water is an adsorption method. The adsorption treatment is effectively used as a post-treatment after using treatment chemicals precipitators. You can use natural porous carbon-containing materials as obtained sorbents, as industrial waste, or cheap carbon raw modified by humans: ash, fines coconut, peat, activated carbon, active clay, bio- and phyto-sorbents, agricultural wastes (rice, barley, wheat husk, nutshells, bagasse, etc.). In this regard, there is a question of finding cheap natural sorbents with a high adsorption capacity. In this article we studied the regularity of extraction of heavy metal cations Cu2+, Co3+, Ni2+, Fe3+ from aqueous solutions, using natural sorbents: husk cedar cones, pine nut meal, walnut partitions, pectin. Constancy of the concentration of heavy metal ions in the solution corresponds to the time of adsorption equilibrium (from 10 to 40 minutes). High adsorption capacity with respect to heavy metal ions showed pectin and proteinaceous materials. It is shown that the adsorption capacity of natural raw materials in relation to heavy metal ions increases by 20-30% due to modification of the surface of biosorbents. The degree of metals extraction from solution using a composition based on a peel cedar cones and pectin increases by 20-30% in comparison with pure husk of a cedar cone. According to the degree of extraction from the aqueous solution, metal ions are arranged in the row Fe3+>Co3+>Ni2+>Cu2+.