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- Title
MICROBIOLOGICAL PROCESSES OF PLATINUM METAL LEACHING (PLATINUM, PALLADIUM AND RHODIUM) FROM FERROUS AND NON – FERROUS INDUSTRIAL WASTE UNDER THE ACTION OF Acidithiobacillus ferrooxidans.
- Authors
Carmen-Mădălina, CISMAŞIU
- Abstract
The potential enzyme evaluation of the acidophilic, chemolitotrophic and heterotrophic bacteria specific to the mining biotope is of high interest in the solubilization, recovery and / or removal of platinum metals from industrial waste car tires. The obtained data show that the formation of extracellular polymeric substances plays an important role in the attachment of the chemolithotrophic bacteria on the surface of minerals, as well as sulphur. In this sense, a direct interaction between the bacterial cells and the solid surface is mandatory for an efficient mobilization of platinum metals from waste car tires. These occur at two levels: (a) physical sorption due to electrostatic forces with low pH in the leaching media; (b) chemical sorption is carried out only in the type of chemical bonds between the bacterial cell disulphide bond and minerals. The optimization of the technological process such as solubilization and the recovery of platinum metal ions contained in ferrous and non-ferrous industrial waste was materialized through a series of laboratory experiments based mainly on the affinity of bacterial cells for certain organic and / or inorganic surfaces. It is based on the results of the physical-chemical characterization of the liquid samples taken. This study deals with the optimization of the solubilization process of metal ions contained in such samples.
- Subjects
ROMANIA; INDUSTRIAL wastes; THIOBACILLUS ferrooxidans; PLATINUM; PLATINUM group; RHODIUM; PALLADIUM; BACTERIAL cell surfaces
- Publication
Oltenia, Studii si Comunicari Seria Stiintele Naturii, 2021, Vol 37, Issue 1, p179
- ISSN
1454-6914
- Publication type
Article