Extracting copper (II) ions from model solutions with carbon containing adsorption material

Abstract

A method for purifying model aqueous solutions from Cu2+ ions with carbon-containing adsorption material obtained by thermal modification of kieselghur sludge is proposed. Waste kieselghur sludge is characterized by an organic-mineral composition, which is formed in the technology of refining vegetable oil at the winterization stage i.e. removing waxes and wax-like substances at a temperature corresponding to their crystallization. As a result of heat treatment of the sludge at a temperature of 500 °C, carbonization of organic substances occurs with the formation of a carbon layer on the surface of diatomite particles and the formation of a carbon-containing adsorption material. The concentrations of Cu2+ ions in model aqueous solutions was determined out by photometric method. It was shown that the maximum sorption of copper ions occurs in the range of pH 6-7 and at the consumption of the adsorbent 1 g per 100 cm3 of solution. The kinetic dependences of the adsorption process are studied-the maximum efficiency of extracting copper ions reaches 15 and 30 minutes at the initial concentration of solutions 10 and 25 mg/dm3, respectively. The adsorption capacity of the carbon-containing material was 14.3 mg/g, the nature of the process is monomolecular.