Researches of Sorbtive Extraction of Nickel(II) Ion by Bentonite Clay

Abstract

The process of sorption of nickel(II) ions with a fixed layer of sorbent by bentonite clays has been investigated. The main advantages of using bentonites in water treatment technologies are described: powerful geological reserves, cheap rock formation, simple preparation for transportation and use, the possibility of using spent sorbents in other technologies, thus eliminating the need for expensive ones at the cost of regeneration.

The influence of different factors (length of process, layer of adsorbent) on the degree of wastewater treatment from nickel ions, influence of pump speed on dynamic capacitance of sorbent is investigated and effective volume is determined. The effectiveness of adsorption increases with increasing the layer of adsorbent, which can be explained by the development of active sorption surface. As the initial concentration of nickel ions increases, the time of appearance of the first traces is polluted at the exit of the column, as well as the total time before the breakthrough. The results of the studies indicate a higher adsorption capacity of modified bentonite in relation to Nickel ions compared with its natural form. The maximum absorption of nickel(II) ions in modified bentonite occurs at a layer of sorbent 20 g for 4,5 hours and is 73,4 %.

The results of the research indicate that the use of natural mineral sorbents is effective, in particular, the bentonite clay of Cherkassy deposit for cleaning of waste water from nickel(II) ions.