Organic Pollutants In Groundwater:
Remediation By Nanoscale Iron Particles
Author(s)
M. G. O. Souza, F. T. Silva & J. F. Oliveira
Abstract
The utilization of zero-valent iron particles in the degradation of organic
compounds was studied in the present work. The Orange 6 dye was selected as
the organic contaminant and initial experiments have been carried out using 10
µm particles. The iron nanoparticles used in the degradation studies were
produced in the laboratory. The main parameters evaluated in the experiments
were the effect of pH, the metallic iron concentration and contact time. The
adsorption of the organic dye onto the quartz surface was studied by zeta
potential measurements. Quartz is generally one of the main constituents of the
aquifer walls. The organic dye increased the negative zeta potential of quartz
particles. This interaction between quartz and the dye compound should be taken
into consideration in the environmental application of the zero-valent iron
technology. The studies on the degradation of the Orange 6 organic dye by
nanoscale iron particles showed that 98% of the dye can be degraded within 30
minutes of contact. Due to the favorable transport of nanoparticles in porous
media of the groundwater aquifers and the flexibility for in situ applications, this
innovative technology seems to have great prospects in the remediation of water
pollution by organic compounds.
Keywords: groundwater remediation, zero-valent iron, organic compounds.
1 Introduction
Groundwater pollution by organic chemicals has become a matter of great
concern due to the large scale production of plastics, solvents and pesticides.
Organic dyes are also an important class of environmental contaminant. Recent
studies have demonstrated the potential importance of nanoscale iron particles as
Keywords
groundwater remediation, zero-valent iron, organic compounds.
Related Book
Other papers in this volume
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