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UDC 628.161.2:544.723.2

Gorelova E. I., Kotov V. V., Данилова Г. Н.

Iron removal from water by sorption on carbonic-silicate composite

Summary

In order to remove impurities from water a composite based on BAU-A activated carbon, silicon dioxide and kaolin with addition of silver nanoparticles was prepared. The composition of the obtained composite supposes the possibility of integrated water treatment with the removal of organic and inorganic impurities and microorganisms; while the presence of silicate- and alumosilicate-containing components in the composite supposes its cation-exchange properties. By scanning microscopy method the increase of the dispersion degree to nanoparticles of the composite fragments after processing with NaOH solution was found. The processes of Fe²⁺ ions sorption from aqueous solutions were studied. The physical and chemical properties of carbonic-silicate composite: saturate specific sorption and selectivity coefficient were determined. Sorption on 10 g of sorbent was carried out by the limited space method with the circulation 0.4 dm³ solution with the preset concentration. The mechanism of Fe²⁺ sorption was proposed that involved absorption process with redistribution of ions between equilibrium solution and pore volume at low Fe²⁺ concentrations; whereas at high Fe²⁺ concentrations - ion exchange sorption. The lowest iron concentrations were determined (25 mg/dm³) that provided for its complete removal as well as the upper limit of concentrations (35 mg/dm³) that provided for the standard values of sorption purification.

Key words

deferrization , sorption , sorbent , carbonic-silicate composite , nanoparticles , selectivity coefficient

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