XPS and XAS Study of the Sorption of Hg(II) onto Pyrite

摘要: Sorption of mercury(II) onto well-characterized samples pyrite was studied between pH 2 and 12 using X-ray photoelectron spectroscopy for surface analysis extended absorption fine structure speciation. In the presence Hg, oxidation strongly decreased. Even if sorption capacity Hg high, reversibility possible by adding some strong ligands, such as I-, S2O32-, CN-, to aqueous phase. Spectroscopic studies showed absence Hg(0) S(−II) evidenced formation a complex S(−I) Hg(II). At low pH, ternary complexes ⋮S-I−Hg−OH or ⋮S-I−Hg−Cl were formed with following distances:  R⋮S-Hg = 2.40 A, RHg-OH 2.25 RHg-Cl 2.33 A Cl- present. high spectroscopic signals S, Fe decreased, possibly because at solid solution constituted (hydr)oxides both oxides pyr...