Sorption of perrhenate anions by lignin anion exchangers

Rhenium(VII) and technetium(VII) separation from aqueous solutions using a polyethylenimine–epichlorohydrin resin

“…The highest Re-removal efficiency among the investigated modified natural sorbents was shown by hexadecyl-pyridiniummodified bentonite (2.3 mmol/g) [13], the polyethylenimine-modified lignin sludge exchanger (1.3 mmol/g) [31] and the amine-modified corn stalk (0.9 mmol/g) [32]. Among the investigated resins, the 4-amino-1,2,4-trazole resin (1.9 mmol/g) [23] and the anion-exchange resin D318 (1.9 mmol/g) [22] showed high Re-sorption capacity.…”

“…In this context, polyethylenimine arises as an attractive material possessing a large number of ternary and quaternary amine groups. Among other applications, this polymer has been studied as modifier of lignin-based anion sorbents for the separation of Re(VII) [31].…”

“…An especially interesting family of materials used for the separation of rhenium and technetium are those containing amino groups (e.g., [15,31,32]). These groups can both chelate cationic and adsorb anionic metal species through electrostatic interactions or hydrogen bonding (e.g., [33,34]).…”

“…Biomaterials and modified biomaterials were also studied for the removal of Re(VII) from waters [30][31][32].…”

Lignin utilization options and methods

“…Also, the kinetic features of Fe 2+ sorption from wastewater, as well as of cobalt and mercury sorption by modified lignin were examined [6,28]. Chopobaeva et al [29] examined sorption of rhenium ions by high-permeability lignin ion exchangers.…”