Application of Arthrospira (Spirulina) platensis biomass for silver removal from aqueous solutions |
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| Authors: | Inga Zinicovscaia Liliana Cepoi Tatiana Chiriac Tatiana Mitina Dmitrii Grozdov Nikita Yushin |
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| Affiliation: | 1. Joint Institute for Nuclear Research, Dubna, Russia;2. Horia Hulubei National Institute for R&3. D in Physics and Nuclear Engineering, Bucharest – Magurele, Romania;4. The Institute of Chemistry of the Academy of Sciences of Moldova, Chisinau, R. Moldova;5. Institute of Microbiology and Biotechnology of the Academy of Science of Moldova, Chisinau, R. Moldova;6. The Institute of Chemistry of the Academy of Sciences of Moldova, Chisinau, R. Moldova;7. Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academу of Sciences, Moskva, Russia;8. Dubna University, Dubna, Russia |
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| Abstract: | 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. |
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| Keywords: | biosorption Arthrospira (Spirulina) platensis silver |
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