2. Academic Validation
  3. Effects of Good's Buffers and pH on the Structural Transformation of Zero Valent Iron and the Oxidative Degradation of Contaminants

Effects of Good's Buffers and pH on the Structural Transformation of Zero Valent Iron and the Oxidative Degradation of Contaminants

  • Environ Sci Technol. 2018 Feb 6;52(3):1393-1403. doi: 10.1021/acs.est.7b04030.
Chuanshu He 1,  Di He 2 3,  Richard N Collins 4,  Shikha Garg 4,  Yang Mu 1,  T David Waite 4
Affiliations

Affiliations

  • 1 CAS Key Laboratory of Urban Pollutant Conversion, Collaborative Innovation Centre of Suzhou Nano Science and Technology, Department of Chemistry, University of Science and Technology of China , Hefei 230026, China.
  • 2 Institute of Environmental Health and Pollution Control, Guangdong University of Technology , Guangzhou 510006, China.
  • 3 Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Guangzhou University of Technology , Guangzhou 510006, China.
  • 4 School of Civil and Environmental Engineering, University of New South Wales , Sydney, NSW 2052, Australia.
PMID: 29307183 DOI: 10.1021/acs.est.7b04030
Abstract

The presence of Good's buffers caused rapid ZVI corrosion and a dramatic release of Fe(II) leading to the Fe(II)-catalyzed transformation of ferrihydrite to lepidocrocite and/or the direct formation of lepidocrocite from the oxidation of Fe(II) in the pH range 4.0-6.2. In comparison, in the absence of Good's buffers, elution of Fe(II) was insignificant with ferrihydrite being the only Fe(III) oxyhydroxide detected following the oxidative transformation of ZVI. The rapid ZVI corrosion in the presence of Good's buffer is possibly due to either (i) disruption of the Fe oxide surface layer as a result of attack by Good's buffers and/or (ii) interaction of Good's buffer with the outer Fe oxide surface and surface-associated Fe(II)/Fe(III) causing the Fe oxide surface layers to be more porous with both these processes facilitating continuous O2 access to the Fe(0) core and allowing the diffusion of Fe atoms outward. Our results further show that the deprotonated forms of Good's buffers and the surface charge of the Fe oxides formed at the ZVI surface strongly affect the sorption of the target compound (i.e., formate) and hence the oxidation of these compounds via surface-associated Fe(II)-mediated heterogeneous Fenton processes.

Figures
Products
  • Cat. No.
    Product Name
    Description
    Target
    Research Area
  • HY-W342700
    PH Buffer