Reactivity recovery of guar gum coupled mZVI by means of enzymatic breakdown and rinsing

Autor(en)

M. Velimirovic, H. Chen, Q. Simons, L. Bastiaens

Abstrakt

Microscale zerovalent iron (mZVI) reduces chlorinated aliphatic hydrocarbons (CAHs) to harmless compounds, but the sedimentation of the mZVI particles in the injection fluid limits the injectability of the particles during field applications. In this study, mZVI particles in suspension were stabilized by green polymer guar gum, which had a positive impact on mZVI stability, but decreased the reactivity of the particles towards CAHs by 1 to 8 times. Guar gum (GG) was found to adsorb onto the mZVI surface, inhibiting contact between the chlorinated compounds and the reactive iron surface. Indications were found for intermolecular hydrogen bonding between mZVI and the guar gum. Subsequent addition of commercially available enzymes resulted in the cleavage of the polysaccharide guar gum into lower molecular fragments, but not in improved reactivity. The reactivity recovery of guar gum coupled mZVI was recovered after intensive rinsing of the iron particles, removing the guar gum fragments from the particles. Overall, this study shows that CAHs can be treated efficiently by guar gum stabilized mZVI after reactivation by means of enzymatic breakdown and rinsing.

Organisation(en)

Externe Organisation(en)

Flemish Institute for Technological Research (VITO)

Journal

Journal of Contaminant Hydrology

Band

142-143

Seiten

1-10

Anzahl der Seiten

10

ISSN

0169-7722

DOI

https://doi.org/10.1016/j.jconhyd.2012.09.003

Publikationsdatum

11-2012

Peer-reviewed

Ja

ÖFOS 2012

210006 Nanotechnologie, 104002 Analytische Chemie, 104023 Umweltchemie, 105904 Umweltforschung

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/f2a1e2bc-879a-47e0-84e6-1928f8da922c