Activated carbon loaded with gold from different halide solutions was characterized by thermalanalysis (TA) techniques. The mechanism of gold uptake by carbon varies from predominately adsorption for gold iodide to predominately reduction for gold chloride. Thermogravimetry analysis (TGA) and differential thermal analysis (DTA) measurements confirm the existence of adsorbed gold-halide species within the micropore structure of carbon. These results suggest that the ratio of reduced to adsorbed gold increases for gold halides in the following order: Au-I < Au-Br < Au-Cl. In the case of Au-I, TA results for the loaded carbon were compared with pure compounds of I2, AuI and AuI3.
ASJC Scopus subject areas
- Control and Systems Engineering
- Geotechnical Engineering and Engineering Geology
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry