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Publication
Assessment of combined electro-nano remediation of molinate contaminated soil
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Advisor(s)
Abstract(s)
Molinate is a pesticide widely used, both in space and time, for weed control in rice paddies. Due to its water
solubility and affinity to organic matter, it is a contaminant of concern in ground and surface waters, soils and
sediments. Previous works have showed that molinate can be removed from soils through electrokinetic (EK)
remediation.
In this work, molinate degradation by zero valent iron nanoparticles (nZVI) was tested in soils for the first time.
Soil is a highly complex matrix, and pollutant partitioning between soil and water and its degradation rates in
different matrices is quite challenging. A system combining nZVI and EK was also set up in order to study the
nanoparticles and molinate transport, as well as molinate degradation.
Results showed that molinate could be degraded by nZVI in soils, even though the process is more time
demanding and degradation percentages are lower than in an aqueous solution. This shows the importance
of testing contaminant degradation, not only in aqueous solutions, but also in the soil-sorbed fraction. It was
also found that soil type was the most significant factor influencing iron and molinate transport. The main
advantage of the simultaneous use of both methods is the molinate degradation instead of its accumulation
in the catholyte.
Description
Keywords
Herbicide Nanoremediation Electrokinetics Contaminated soil Zero valent iron nanoparticles (nZVI)
