Ability of Cyanobacteria and Arthrobacter Species to Remove Gold Ions from Solution

TL;DR

This study investigates the capacity of cyanobacteria and Arthrobacter bacteria to biosorb gold ions from solutions, analyzing how pH affects biosorption efficiency and providing specific biosorption constants for different species.

Contribution

It presents new data on gold biosorption by specific cyanobacteria and bacteria, including biosorption constants and pH effects, which were previously unreported.

Findings

Arthrobacter globiformis shows the highest biosorption constant at pH 7.1.

Biosorption efficiency varies with pH, peaking at pH 8.4 for Spirulina.

Quantitative biosorption constants are provided for different species and pH conditions.

Abstract

The biosorption of Au(III) - Spirulina platensis and Au(III) - Arthrobacter species (Arthrobacter globiformis and Arthrobacter oxidas) were studied at simultaneous application of dialysis and atomic absorption analysis. Also biosorption of Au(III) - Spirulina platensis at various pH were discussed. Biosorption constants for Au-cyanobacteris Spirulina platensis at different pH, and for Arthrobacter oxidas and Arthrobacter globiformis at pH=7.1 are : 1. K=3.91 x 10-4 (Au- Arthrobacter oxidas 61B, pH=7.1) 2. K=14.17 x 10-4 . (Au- Arthrobacter globiformis 151B, pH=7.1). 3. K=2.07x10-4 (Au- Spirulina platensis, pH=7.1) 4. K= 4.87x10-4 (Au- Spirulina platensis, pH=6.2) 5. K=8.7x10-4 (Au- Spirulina platensis, pH=8.4)