Zn adsorption onto Irish Fucus vesiculosus: Biosorbent uptake capacity and atomistic mechanism insights

The Irish kelp, Fucus vesiculosus, a highly potential green bio sorbent for Cd (II) removal: Mechanism, quantitative and qualitative approaches

“…Although generally from metals chemistry point of view metals may behave similarly in solution, their chemical speciation differs slightly as a consequence of their variation in electronegativity. Thus, their adsorption on sorbents varies significantly, fact that was seen comparatively in our previous study at a low and single metal concentration: Cd(II) was adsorbed almost twice as Zn on the dried Irish kelp (Brinza et al, 2019). In this work, we extend our previous investigations of metals biosorption onto dried algal biomass Fucus vesiculosus from the Irish Sea, in particular, focusing on quantitative and qualitative assessments of cadmium [Cd(II)] uptake using the novel synchrotron approach besides the ordinary laboratory based and modelling ones.…”

“…Few studies have used synchrotron techniques to study metal binding mechanisms on various bio matrices (e.g., mussels, mosses, leaves, algae) which have demonstrated that these techniques provide direct speciation information without metal specie alteration (González et al, 2016;Huguet et al, 2012;Manceau et al, 2019;Mari et al, 2015;Yan et al, 2020). Our previous laboratory based, supplemented by synchrotron investigations on zinc [Zn(II)] adsorption onto marine kelp Fucus vesiculosus (Brinza et al, 2019; allowed us to elucidate combined mechanisms for Zn(II) sorption on the complex and heterogeneous algae surface (ion exchange of light metals, H bonding, covalent bonding with carboxyl functional groups from alginate and cellulose components of the algae cell wall, in specific proportions as a function of pH, metal concentration and algae dosage or metal/sorbent/solution ratios). Qualitatively, the synchrotron micro X Ray analyses showed direct evidence of Zn bonding by carboxylic functional groups preponderantly of alginate and less cellulose components of the algae cell wall, Zn been surrounded by 5 -6 oxygens at atomic distance of 1.98-2.03 Å (Brinza et al, 2019).…”

Molecular Mechanisms of Lead Binding to Ferrihydrite–Bacteria Composites: ITC, XAFS, and μ-XRF Investigations

“…Moreover, the combination of bulk and microfocus X-ray spectroscopy provides more precise coordination information concerning Pb­(II) binding to complex media. , The high correlation between Fe, S, and Pb elements obtained by μ-XRF analysis indicated that the spatial distribution of single Pb phases is regulated both by ferrihydrite and B. subtilis . For Pb-absorbed bacteria, our EXAFS fitting results suggested that each Pb atom was coordinated by 1.0 C atom at a distance of 2.64 Å or 1.0 P atom at a distance of 3.10 Å (SI Table S2).…”

“…Thus, investigations on metal sorption behavior at a molecular scale remain limited. Advancements in microscopically focused X-ray spectroscopy analysis have made it possible to investigate the binding of trace elements at a molecular scale within complex media due to their selectivity to known hot spots and their representation of single metal phases . For example, Mamindy-Pajany et al obtained spatial distribution and speciation information on toxic metals in biosolid-amended soil (a multiple phase media) by analyzing micrometer-sized hot spots using microfocus X-ray fluorescence spectroscopy (μ-XRF) maps.…”

A novel indole-based conjugated microporous polymer for highly effective removal of heavy metals from aqueous solution via double cation–π interactions

“…In recent years, the health of human beings has been endangered by heavy metal ions, and it is therefore very important to remove heavy metals from aqueous solutions due to their toxicity and bioaccumulation. [1][2][3][4] Moreover, excessive intake of heavy metal ions, for example, Ni(II), 5 Cu(II), 6 Zn(II) 7 and Cr(III) 8 is harmful to humans and other species. A wide range of technologies have been investigated for heavy metal ion removal from water including chemical precipitation, 9 organic chelation, 10,11 biological removal, 12 ion-exchange, 13,14 membrane separation 15 and adsorption.…”