Associations between iron oxyhydroxide nanoparticle growth and metal adsorption/structural incorporation

摘要: Abstract The interaction of metal ions and oxyanions with nanoscale mineral phases has not been extensively studied despite the increased recognition their prevalence in natural systems as a significant component geomedia. A combination macroscopic uptake studies to investigate adsorption behavior As(V), Cu(II), Hg(II), Zn(II) onto nanoparticulate goethite (α-FeOOH) function aging time at elevated temperature (75°C) synchrotron-based X-ray track changes both sorption mode rate nanoparticle growth reveals effects that on particle growth. Metal(loid) species which sorb quickly iron oxyhydroxide particles (As(V), Cu(II)) appear passivate surface, impeding nanoparticles progressive aging; contrast, more slowly (Hg(II), Zn(II)) have considerably less impact Progressive speciation these particular metals suggest shifts time, possibly indicating structural incorporation metal(loid) into nanoparticle; this is supported by continued increase concomitant growth, implying may transform from surface-sorbed structurally incorporated forms. This type would implications for long-term fate mobility contaminated regions, affect strategies potential remediation/modeling efforts.