期刊
INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
卷 19, 期 11, 页码 1053-1058出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/15226514.2017.1319332
关键词
biosorption; Arthrospira (Spirulina) platensis; silver
资金
- Russian Foundation for Basic Research [16-33-00434]
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 (Delta G degrees, Delta H degrees and Delta S degrees) revealed that the adsorption process of silver ion by spirulina biomass was exothermic and spontaneous (Delta G degrees < 0), and exothermic (Delta H degrees < 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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