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Chemical and structural characterization of copper adsorbed on mosses (Bryophyta)

AuthorsGonzález, Aridane G.; Jiménez-Villacorta, Félix ; Beike, Anna K.; Reski, Ralf; Adamo, Paola; Pokrovsky, Oleg S.
Issue Date5-May-2016
CitationJournal of Hazardous Materials 308: 343-354 (2016)
AbstractThe adsorption of copper on passive biomonitors (devitalized mosses Hypnum sp., Sphagnum denticulatum, Pseudoscleropodium purum and Brachythecium rutabulum) was studied under different experimental conditions such as a function of pH and Cu concentration in solution. Cu assimilation by living Physcomitrella patents was also investigated. Molecular structure of surface adsorbed and incorporated Cu was studied by X-ray Absorption Spectroscopy (XAS). Devitalized mosses exhibited the universal adsorption pattern of Cu as a function of pH, with a total binding sites number 0.05-0.06 mmolg and a maximal adsorption capacity of 0.93-1.25 mmolg for these devitalized species. The Extended X-ray Absorption Fine Structure (EXAFS) fit of the first neighbor demonstrated that for all studied mosses there are ~4.5 O/N atoms around Cu at ~1.95 Å likely in a pseudo-square geometry. The X-ray Absorption Near Edge Structure (XANES) analysis demonstrated that Cu(II)-cellulose (representing carboxylate groups) and Cu(II)-phosphate are the main moss surface binding moieties, and the percentage of these sites varies as a function of solution pH. P. patens exposed during one month to Cu yielded ~20% of Cu(I) in the form of Cu-S(CN) complexes, suggesting metabolically-controlled reduction of adsorbed and assimilated Cu.
Publisher version (URL)https://doi.org/10.1016/j.jhazmat.2016.01.060
Identifiersdoi: 10.1016/j.jhazmat.2016.01.060
issn: 0304-3894
Appears in Collections:(ICMM) Artículos
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