Significance of age, temperature, and aeration of yeast cell culture for the biosorption of europium from aquatic systems

Abstract

A B S T R A C TThe Eu(III) uptake from aqueous solutions by Saccharomyces cerevisiae, Kluyveromyces marxianus, and Debaromyces hansenii was studied as a function of the growth temperature, supply of air flow during the cultivation process, and the age of cells. Our results revealed that exponential phase cells and the optimum temperature of growth resulted in a higher metal uptake, while aeration did not have any significant effect on the uptake. These traits make the proposed bisorbents desirable for clean-up processes due to easy access and low cost, as well as low time-and low energy-consuming optimal conditions as specified in this study. The reason why younger cells grown close to the optimal temperature show higher metal removal capacity is related to qualitative and quantitative alterations of their membranes' content in fatty acids and carboxyl groups mainly.

Adsorption of rare earth metals: A review of recent literature

“…Distilled water can desorb these REEs that are not strongly attached (bounded) onto adsorbents surface, are physisorbed and therefore are easily released in to aqueous solution [43]. Generally, REEs at low pH values are in ionic form with positive charge while at higher pH values start to precipitate as hydroxide form (the limit from which the metal forms metal-(OH) 3 , depends on the REEs) [5]. Based on the fact that REEs have positive charge at low pH values, the use of HCl and HNO 3 , solutions aimed to increase the concentration of protons.…”

Facile synthesis of chitosan derivatives and Arthrobacter sp. biomass for the removal of europium(III) ions from aqueous solution through biosorption

“…Chitosan is usually known to rely mainly on the eNH 2 group as its active metal binding site typically between pH 2 and 4.5 and thus, it is inferred here that as the pH increased from 2 to 3, the metal binding activity of the eNH 2 group increased (Shameem et al, 2006). On the bacterial cell surface there were other positively charged moieties such as protein resides or peptides that would have increased this competition (Anagnostopoulos and Symeopoulos, 2014).…”

Investigation of growth kinetics of Debaryomyces hansenii (LAF‐3 10 U) in petroleum refinery desalter effluent

“…This yeast grew well in mineral wastewater containing carbon sources and supplemented by NaCl or KCl . D. hansenii strains are able to produce the volatile compounds (e.g., mainly ester compounds, ethyl and methyl esters, sulphur, alcohols, aldehydes, and ketones). It was shown that the yeast can grow in oil mill wastewaters with (NH 4 ) 2 SO 4.…”