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Enhanced transport and transformation of zero-valent nanoiron in clay using direct electric current
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Orientador(es)
Resumo(s)
One of the major obstacles to zerovalent
iron nanoparticles (nZVI) application in soil and
groundwater remediation is the limited transport, especially in low-permeability soils. In this study, direct
current (constant potential of 5.0 V) was used to enhance polymer-coated nZVI mobility in different porous media, including a bed of glass beads and kaolin
clay. The tests were conducted using a modified electrophoretic cell and with nZVI concentrations typical
of field applications (4 g L−1
). Experimental results
indicate that the use of direct current can enhance the
transport of the polymer-modified nanoparticles when
compared with natural diffusion in low permeability or
surface neutral porous medium. The applied electric
field appeared to enhance the oxidation–reduction potential, creating a synergistic effect of nZVI usage with
electrokinetics. Aggregation of the nanoparticles, observed near the injection point, remained unresolved.
Descrição
Palavras-chave
Zerovalent iron nanoparticles (nZVI) Enhanced transport Direct current Electrokinetics Electrochemical treatment
Contexto Educativo
Citação
Editora
Springer Nature