Abstract
A promising method for obtaining sterically and chemically stable nano zero valent iron (nZVI) suspensions is the use of green tea (GT) extract for the synthesis of iron nanoparticles. However, the stability of this suspension when delivered in the subsurface depends highly on the specific geochemistry of soil material. Current work was focused on studying the fate of green tea nZVI (GT-nZVI) suspensions in contact with calcareous soils, which are typical in many relatively arid areas. The experimental work involved the synthesis and characterisation of GT-nZVI suspensions and the implementation of column tests using mixtures of quartz sand and natural soil. The results of column tests indicated that the mobility of nZVI suspension is directly related to the progress of the neutralization reactions between the acidic GT suspension and soil calcite. Calcite neutralizes the acidic GT-nZVI suspension and causes the precipitation of aquatic Fe(III) in the form of ferric hydroxides. The ZVI nanoparticles are attached to the solid ferric hydroxides, and thus they are removed from the fluid phase.
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