Biosorption Of Ba (Ii) From Aqueous Solutions

Abstract:

The search for alternative technologies of low operating cost for effluent treatment has directed attention to biosorption. This method employs inactive or dead biomass to remove metallic ions from aqueous solutions and the promising results has been considered by the scientific community as an alternative technology to replace traditional methods of metals removal. Recently, various biological materials, such as bacteria and agro-waste have been used for heavy metals removal from industrial effluents. Biosorption of heavy metals by biological species depend not only on the affinity between the metallic species and the binding sites on the molecular structure of the cellular wall, but also on environmental conditions of microorganism growth and biomass processing procedure. Barium is widely used in many industrial applications. This way, they are present in effluent derived from various industrial processes, such as mining and petroleum. The objective of this work was to examine the efficiency of R. opacus, which present various carboxylic groups, as adsorbent for the removal of barium (II) from aqueous solutions, aiming at a future application for the treatment of effluents. The R. opacus strain was obtained from the cultures collection of André Tosello Foundation, SP/Brazil. It was cultivated in a culture broth containing: malt extract, yeast extract, peptone and glucose, at 280C. The pH of the growth medium was adjusted to 7.2 by the addition of NaOH prior to autoclaving. All biosorption experiments were carried out in a duplicate run basis. Experiments were conducted in 250 mL erlenmeyer flasks containing barium (II) synthetic solutions of known concentrations. Flasks were agitated on a shaker at a constant shaking rate of 160 rpm for 3 h to ensure that equilibrium was reached. The amount of metal adsorbed was determined at different initial and residual metal concentrations.

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