АДСОРБЦИЯ ИОНОВ ЖЕЛЕЗА (III) ИЗ ИХ ВОДНЫХ РАСТВОРОВ С ПОМОЩЬЮ КИСЛОТНОАКТИВИРОВАННОЙ ГЛИНЫ МЕСТОРОЖДЕНИЯ "ПОДГОРНОЕ - 3"

Abstract

Water is an essential resource used by all organisms on earth. Recently, however, contamination of water by heavy metal ions, such as Fe(III), from human activities has become more common. In addition to deterioration of colour, odour and taste, consumption of such water has a negative impact on public health: liver, pancreas, heart diseases develop, and metabolism is disturbed. For this reason, purification of water from Fe (III) ions is an urgent task, which is solved, among other things, by sorbing it from aqueous media with bentonite-like clays and derivatives based on them. Earlier we studied the material (chemical, mineralogical) composition of bentonite-like clay of Podgornoye-3 site of Nikolskoye deposit of Voronezh region and gave a favourable assessment for the use of this clay as an adsorbent for water purification. This paper presents the results of the study of Fe (III) adsorption from aqueous solutions by three different products obtained by acid treatment of bentonite-like clay. The influence of various factors (duration of adsorption, pH of the medium in which the process took place, initial concentrations of adsorbent and sorbate, concentration of sulphuric acid with which the clay was treated) on the adsorption efficiency was studied in the experiments. It was determined by estimating the absolute adsorption i.e. the ratio of adsorbed Fe (III) to the mass of adsorbent and as relative i.e. the ratio of adsorbed Fe (III) to the initial amount of Fe (III) in per cent. It was found that adsorption efficiency increases with increase in contact duration, increase in pH (between 1.5 and 4), increase in adsorbent:sorbate ratio.