226 Ra, 238 U and Cd adsorption kinetics and binding capacity of two cyanobacterial strains isolated from highly radioactive springs and optimal conditions for maximal removal effects in contaminated water

Biomass-based decontamination methods are among the most interesting water treatment techniques. In this study, 2 cyanobacterial strains, Nostoc punctiforme A.S/S4 and Chroococcidiopsis thermalis S.M/S9, isolated from hot springs containing high concentrations of radium ( Ra), were studied to be ass...

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Published inInternational journal of phytoremediation Vol. 20; no. 4; pp. 369 - 377
Main Authors Heidari, Fatemeh, Riahi, Hossein, Aghamiri, Mahmoud Reza, Zakeri, Farideh, Shariatmadari, Zeinab, Hauer, Tomáš
Format Journal Article
LanguageEnglish
Published United States 21.03.2018
Subjects
Adsorption
Biodegradation, Environmental
Cadmium
Cyanobacteria
Hydrogen-Ion Concentration
Kinetics
Radioactivity
Spectroscopy, Fourier Transform Infrared
Water Pollutants, Chemical
radionuclides
Adsorption
high-background radiation areas
cyanobacteria
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Summary:Biomass-based decontamination methods are among the most interesting water treatment techniques. In this study, 2 cyanobacterial strains, Nostoc punctiforme A.S/S4 and Chroococcidiopsis thermalis S.M/S9, isolated from hot springs containing high concentrations of radium ( Ra), were studied to be associated with removal of radionuclides ( U and Ra) and heavy metal cadmium (Cd) from aqueous solutions. The adsorption equilibrium data was described by Langmuir and Freundlich isotherm models. Kinetic studies indicated that the sorption of 3 metals followed pseudo-second-order kinetics. Effects of biomass concentration, pH, contact time, and initial metal concentration on adsorption were also investigated. Fourier-transform infrared spectroscopy revealed active binding sites on the cyanobacterial biomass. The obtained maximum biosorption capacities were 630 mg g and 37 kBq g for U and Ra for N. punctiforme and 730 mg g and 55 kBq g for C. thermalis. These 2 strains showed maximum binding capacity 160 and 225 mg g , respectively for Cd adsorption. These results suggest that radioactivity resistant cyanobacteria could be employed as an efficient adsorbent for decontamination of multi-component, radioactive and industrial wastewater.
ISSN:1522-6514
1549-7879
DOI:10.1080/15226514.2017.1393392