Removal of the radionuclides from aqueous solutions by biosorption on the roots of the dandelion (Taraxacum officinale)

Abstract

A novel biosorbent-dandelion root (DRB)-was investigated as adsorbent for removal of Sr(II) and Am(III) from aqueous solutions. Batch equilibrium experiments were carried out to study the effect of contact time, initial concentration of the metal and pH of the media as well as of the sorbent amount. The equilibrium time was found to be 90 min for adsorption of both radionuclides. The kinetic model can be described by the pseudo-secondorder model well, and the isotherm model is fitted to Freundlich model the best. The maximum adsorption capacity of the DRB at pH about 6.0 was calculated to be 63.7 and 80.6 g kg -1 for Sr(II) and Eu(III), respectively. About 90 % of Am(III) and 80 % of Sr(II) were removed when 30 mg of the biosorbent was used in 1 mL of the solution. Use of the sequential portions of the fresh sorbent is expected to increase efficiency of the process. Complexation of Sr(II) and Am(III) by strong chelating agents, e.g., citrate, oxalate and EDTA, did not diminish significantly the sorption efficiency of the sorbent. Once sorbed, \1 % of each radionuclide was desorbed by water.Graphical Abstract Low-cost biomass obtained from the dandelions' roots (DRB) was investigated as adsorbent for removal of strontium and americium from aqueous solutions.

Clay-salt slimes of the JSC “Belaruskali” as potential engineering barriers in the radioactive waste repositories: sorption of Cs(I), Sr(II), Eu(III) and Am(III)

“…Our work fits well into this scope of research. As can be seen from the table, sorption properties of the CSS sorbents are comparable with the most common natural sorbents reviewed by Fuks et al (2016). …”

“…Among them, about 5.500 have been found for the americium sorption and more than 9.000 for strontium. Some examples of the literature data on sorption of strontium(II) and americium(III) may be found in the paper of Fuks et al (2016). In some cases, the original data have been recalculated according to Eq.…”

Fly Ash as a Potential Adsorbent for Removing Radionuclides from Aqueous Solutions in an Adsorption-Membrane Assisted Process Compared to Batch Adsorption

“…Batch sorption experiments were conducted to study the sorption behavior of the mono-, di- and trivalent cationic radionuclides on the fly ash (FA) obtained from the coal combustion at the Zeran power plant in Warsaw. Sorption studies of the multimetal systems were performed, similarly to our previous research [ 31 ]. The monovalent cations were represented by Cs(I)-137, the divalent cations by Sr(II)-85 and Co(II)-60, and the tetravalent cations—by Am(III)-241.…”

Clay-salt slimes of the “Belaruskali” - novel sorbents for management of liquid radioactive wastes and decontamination of environmental water streams

“…A great number of low-cost adsorbents have been already tested, among them clays, zeolites, hydrous oxides of different metals. Because review of the International Atomic Energy Agency (IAEA) literature database INIS provides about 20,000 records related to the radioactive metal sorption from aqueous solutions, selection of the data on sorption of strontium(II) and americium(III) has been published in one of our previous papers [37]. Comparison of the data presented here with sorption properties of the CSS sorbents shows that the latter is of the same range as the representatives of another group of the natural sorbents.…”