Biosorption of Ag(I)-Spirulina platensis for different pH

TL;DR

This study investigates how pH levels affect the biosorption of silver ions by Spirulina platensis, revealing pH-dependent variations in biosorption capacity and interaction nature, with maximum biosorption at neutral pH.

Contribution

It provides new insights into pH-dependent biosorption mechanisms of Ag(I) by Spirulina platensis, including changes in biosorption constants and interaction types.

Findings

Biosorption constant increases with pH.

Biosorption capacity decreases with pH.

Maximum biosorption occurs at pH 7.0.

Abstract

Biosorption of Ag(I)-Spirulina platensis for different pH were investigated using dialysis and Atomic-absorbtion analysis. It was shown, that the biosorption constant for Ag(I) Spirulina platensis complex and the capacity depend on the change of pH. In particular, with the increase of pH (pH=5.5. and pH=8.6 cases), the biosorption constant increase and the capacity decreases. The nature of interaction is also changed. In case of neutral pH, the interaction Ag(I)-S. platensis is of cooperative character and maximum metal biosorption by S. platensis biomass was observed at pH 7.0.