title: Corrosion rate estimations of microscale zerovalent iron particles via direct hydrogen production measurements.
abstract: In this study, the aging behavior of microscale zerovalent iron (mZVI) particles was investigated by quantifying the hydrogen gas generated by anaerobic mZVI corrosion in batch degradation experiments. Granular iron and nanoscale zerovalent iron (nZVI) particles were included in this study as controls. Firstly, experiments in liquid medium (without aquifer material) were performed and revealed that mZVI particles have approximately a 10-30 times lower corrosion rate than nZVI particles. A good correlation was found between surface area normalized corrosion rate (RSA) and reaction rate constants (kSA) of PCE, TCE, cDCE and 1,1,1-TCA. Generally, particles with higher degradation rates also have faster corrosion rates, but exceptions do exists. In a second phase, the hydrogen evolution was also monitored during batch tests in the presence of aquifer material and real groundwater. A 4-9 times higher corrosion rate of mZVI particles was observed under the natural environment in comparison with the aquifer free artificial condition, which can be attributed to the low pH of the aquifer and its buffer capacity. A corrosion model was calibrated on the batch experiments to take into account the inhibitory effects of the corrosion products (dissolved iron, hydrogen and OH(-)) on the iron corrosion rate.
authors: Flemish Institute for Technological Research (VITO), Boeretang 200, 2400 Mol, Belgium; University of Antwerp, Department of Bio-Engineering, Groenenborgerlaan 171, 2020 Antwerp, Belgium. Electronic address: milica.velimirovic@vito.be.
authors: Milica
authors: M
authors: Velimirovic
authors: Department of Water Management, Delft University of Technology, PO Box 5048, 2600 GA Delft, The Netherlands. Electronic address: L.Carniato@tudelft.nl.
authors: Luca
authors: L
authors: Carniato
authors: Flemish Institute for Technological Research (VITO), Boeretang 200, 2400 Mol, Belgium. Electronic address: queenie.simons@vito.be.
authors: Queenie
authors: Q
authors: Simons
authors: Department of Water Management, Delft University of Technology, PO Box 5048, 2600 GA Delft, The Netherlands. Electronic address: G.H.W.Schoups@tudelft.nl.
authors: Gerrit
authors: G
authors: Schoups
authors: Flemish Institute for Technological Research (VITO), Boeretang 200, 2400 Mol, Belgium; University of Antwerp, Department of Bio-Engineering, Groenenborgerlaan 171, 2020 Antwerp, Belgium; Ghent University, Department of Soil Management, Coupure Links 653, 9000 Gent, Belgium. Electronic address: piet.seuntjens@vito.be.
authors: Piet
authors: P
authors: Seuntjens
authors: Flemish Institute for Technological Research (VITO), Boeretang 200, 2400 Mol, Belgium. Electronic address: leen.bastiaens@vito.be.
authors: Leen
authors: L
authors: Bastiaens
mesh_terms: D003343:Corrosion; D060587:Groundwater / Q000737:chemistry; D006859:Hydrogen / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*
chemical_list: D006859:Hydrogen; D007501:Iron
keywords: Apparent corrosion rate; H(2) production; Life-time; mZVI