Biosorption of Re(VII) from Batch Solutions and Industrial Effluents by Cyanobacteria Spirulina platensisстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 20 августа 2018 г.
Аннотация:The potential of Spirulina platensis biomass for rhenium ions removal from both batch solutions and industrial effluents was evaluated. The effect of pH, contact time, initial metal concentration, and the temperature of biosorbent treatment on the biosorption process was investigated. The maximum biosorption capacity of 142.9 mg/g rhenium was achieved at pH 2, sorbent dosage 0.05 g, and temperature of biosorbent treatment 30 °C. The equilibrium data were well fitted by Langmuir and Freundlich adsorption isotherm models (R2 = 0.99), while the pseudo‐second order kinetic model (R2 > 0.99) was found to describe better the kinetic data. Fourier‐transform infrared (FTIR) spectra showed that rhenium biosorption takes place through two mechanisms: ionic interactions of perrhenate anions with amide and amino‐groups and/or binding to organic functional groups of the cell surface. The rhenium bound to the biomass could be effectively stripped using NH4OH (8 %) and the biomass was effectively used for three sorption‐desorption cycles. In the case of industrial effluents, S. platensis biomass has been shown to have relatively high rhenium removal efficiency (51–55%). Spirulina platensis biomass can be efficiently applied for rhenium removal from industrial effluents.