Application of Arthrospira (Spirulina) platensis biomass for silver removal from aqueous solutions
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ZINICOVSCAIA, Inga; CEPOI, Liliana; CHIRIAC, Tatiana; MITINA, Tatiana; GROZDOV, Dmitrii; YUSHIN , Nikita; CULICOV, Otilia Ana. Application of Arthrospira (Spirulina) platensis biomass for silver removal from aqueous solutions. In: International Journal of Phytoremediation. 2017, nr. 11(19), pp. 1053-1058. ISSN 1522-6514.
10.1080/15226514.2017.1319332
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International Journal of Phytoremediation
Numărul 11(19) / 2017 / ISSN 1522-6514

Application of Arthrospira (Spirulina) platensis biomass for silver removal from aqueous solutions

DOI: https://doi.org/10.1080/15226514.2017.1319332

Pag. 1053-1058

Zinicovscaia Inga123, Cepoi Liliana4, Chiriac Tatiana4, Mitina Tatiana3, Grozdov Dmitrii5, Yushin Nikita16, Culicov Otilia Ana71
 
1 Joint Institute of Nuclear Research,
2 Horia Hulubei National Institute for Physics and Nuclear Engineering,
3 Institute of Chemistry of the Academy of Sciences of Moldova,
4 Institute of Microbiology and Biotechnology of the ASM,
5 V.I.Vernadsky Institute of Geochemistry, Moscow,
6 International University „Dubna",
7 National Institute for Research and Development in Electrical Engineering ICPE-CA, Bucharest
 
Disponibil în IBN: 11 decembrie 2017


Rezumat

The cyanobacterium Arthrospira (Spirulina) platensis was used to study the process of silver biosorption. Effects of various parameters such as contact time, dosage of biosorbent, initial pH, temperature, and initial concentration of Ag(I) were investigated for a batch adsorption system. The optimal biosorption conditions were determined as pH 5.0, biosorbent dosage of 0.4 g, and initial silver concentration of 30 mg/L. Equilibrium adsorption data were analyzed by the Langmuir and Freundlich models–however, the Freundlich model provided a better fit to the experimental data. The kinetic data fit the pseudo-second-order model well, with a correlation coefficient of 0.99. The analysis of thermodynamic parameters (ΔG°, ΔH° and ΔS°) revealed that the adsorption process of silver ion by spirulina biomass was exothermic and spontaneous (ΔG° < 0), and exothermic (ΔH° < 0) process. The biosorption capacity of biomass A. platensis serves as a basis for the development of green technology for environmental remediation.

Cuvinte-cheie
Arthrospira (Spirulina) platensis,

biosorption, Silver