Characterization of mercury sorption on hydroxylapatite: Batch studies and microscopic evidence for adsorption

Enhanced Adsorption of Mercury(II) and Cadmium(II) from Aqueous Solution onto Rice Bran Modified with Chelating Ligands

“…Secondly, the activity of heavy metal ions was reduced by enhanced electrostatic repulsion and a greater tendency to form metalanion complexes such as CdOH . As reported previously (Kim and Lee 2014;Hu et al 2014), the coordinating ligands of Cl are much greater than NO3 -with Hg(II) and Cd(II), which may explain the more negative effect of NaCl. …”

Ionic Strength Differentially Affects the Bioavailability of Neutral and Negatively Charged Inorganic Hg Complexes

“…One of the major limitations of phosphate buffers used in previous Hg bioassays is the inability to expose cells to divalent metals in association with Hg or alter the pH of the solution without changing Hg speciation. Phosphate is notorious for precipitating divalent metals in low concentrations, and through this process to also coprecipitate mercury. ,− However, the use of chelating agents such as cysteine and EDTA make these metals soluble in the presence of phosphate , but will consequently alter Hg speciation. After calculating the solubilities of these metals based on a typical phosphate buffer for mercury exposure (Table S2: Thermodynamic Modeling), we designed an exposure solution (BMAA exposure media, SI: Media Recipes) using β-glycerophosphate that can be used as a source of phosphorus by bacterial cells while avoiding precipitation of divalent metals. , Furthermore, BMAA medium allows for Hg to exist as Hg­(OH) 2 over a wide range of pH (at 37 °C) allowing us to test for the influence of Hg adsorption on cell surface (Figure S1: Thermodynamic Modeling), while keeping its speciation constant.…”

Superparamagnetic nalidixic acid grafted magnetite (Fe3O4/NA) for rapid and efficient mercury removal from water

“…The removal of metal at the adsorbent surface can be attributed to different plausible mechanisms including adsorption, ion exchange, absorption, surface precipitation, coprecipitation, diffusion and etc. 46,47 The XPS analysis of Fe 3 O 4 /NA-Hg revealed vital information which was valuable in order to investigate the removal mechanism of Hg(II) by using Fe 3 O 4 /NA. Fig.…”

“…Fig. 9a shows narrow XPS scan of Hg in 4f region and the peak at 101.5 eV corresponds to binding energy of 4f 7/2 of Hg(II), 47 indicating Hg(II) is adsorbed onto the Fe 3 O 4 /NA. The narrow scan of the binding energy (BE) of oxygen (O1s) of Fe 3 O 4 /NA-Hg (Fig.…”