Silver and Gold Ions Recovery from Batch Systems Using Spirulina platensis Biomass
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2019-10-04 20:08
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CEPOI, Liliana; ZINICOVSCAIA, Inga; CHIRIAC, Tatiana; RUDI, Ludmila; YUSHIN , Nikita; MISCU, Vera. Silver and Gold Ions Recovery from Batch Systems Using Spirulina platensis Biomass. In: Ecological Chemistry and Engineering S. 2019, nr. 2(26), pp. 229-240. ISSN -.
10.1515/eces-2019-0029
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Ecological Chemistry and Engineering S
Numărul 2(26) / 2019 / ISSN - /ISSNe 1898-6196

Silver and Gold Ions Recovery from Batch Systems Using Spirulina platensis Biomass


DOI: 10.1515/eces-2019-0029
Pag. 229-240

Cepoi Liliana1, Zinicovscaia Inga23, Chiriac Tatiana1, Rudi Ludmila1, Yushin Nikita3, Miscu Vera1
 
1 Institute of Microbiology and Biotechnology ,
2 Institutul Naţional de Fizică şi Inginerie Nucleară "Horia Holubei",
3 Joint Institute of Nuclear Research
 
Disponibil în IBN: 15 august 2019


Rezumat

In order to assess ability of Spirulina platensis to recover silver and gold ions from the environment the bioaccumulation of silver and gold ions and their effect on growth, proteins and carbohydrates content of Spirulina platensis biomass was studied. Silver nitrate (AgNO3) in concentration range 0.01-1 mg/dm3 and tetrachloroaurate Na[AuCl4] in concentration range 18.5-370 mg/dm3 were added as component of the Spirulina platensis cultivation medium. In case of silver two cultivation media were studied: standard and Cl-free. The process of silver and gold uptake was traced using neutron activation analysis. Presence of silver ions in standard cultivation medium reduced biomass productivity by 66 %, while in Cl-free biomass productivity was reduced by 11.8 % only. The reduction of proteins content by 30 % in Cl-free medium and by 19 % in standard medium was also observed. The experiments showed that in case of gold ions loading, the biomass productivity and protein content were reduced only at high Na[AuCl4] concentration in the medium. The behaviour of carbohydrates content change was similar under silver and gold loadings: decrease at low metal concentration followed by increase at high metal concentrations. Scanning electron microscopy allowed observation of spherical metal nanoparticles, which were formed extracellularly during silver and gold bioaccumulation. Spirulina platensis can be used for recovery of precious metals as well as metal nanoparticles production.