title: Carbonate minerals in porous media decrease mobility of polyacrylic acid modified zero-valent iron nanoparticles used for groundwater remediation.
abstract: The limited transport of nanoscale zero-valent iron (nZVI) in porous media is a major obstacle to its widespread application for in situ groundwater remediation. Previous studies on nZVI transport have mainly been carried out in quartz porous media. The effect of carbonate minerals, which often predominate in aquifers, has not been evaluated to date. This study assessed the influence of the carbonate minerals in porous media on the transport of polyacrylic acid modified nZVI (PAA-nZVI). Increasing the proportion of carbonate sand in the porous media resulted in less transport of PAA-nZVI. Predicted travel distances were reduced to a few centimeters in pure carbonate sand compared to approximately 1.6 m in quartz sand. Transport modeling showed that the attachment efficiency and deposition rate coefficient increased linearly with increasing proportion of carbonate sand.
authors: Department of Environmental Geosciences, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria.
authors: Susanne
authors: S
authors: Laumann
authors: Vesna
authors: V
authors: Micić
authors: Gregory V
authors: GV
authors: Lowry
authors: Thilo
authors: T
authors: Hofmann
mesh_terms: D000180:Acrylic Resins / Q000032:analysis*; D002254:Carbonates / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D060587:Groundwater / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D016062:Porosity; D011791:Quartz / Q000737:chemistry; D013499:Surface Properties; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D000180:Acrylic Resins; D002254:Carbonates; D014874:Water Pollutants, Chemical; D011791:Quartz; C006903:carbopol 940; D007501:Iron