Removal of hexavalent chromium from contaminated ground water using zero-valent iron nanoparticles

Abstract

Batch experiments were conducted on ground water samples collected from a site contaminated with Cr(VI) to evaluate the redox potential of zero-valent iron (Fe(0)) nanoparticles for remediation of Cr(VI)-contaminated ground water. For this, various samples of contaminated ground water were allowed to react with various loadings of Fe(0) nanoparticles for a reaction period of 60 min. Data showed 100% reduction of Cr(VI) in all the contaminated ground water samples after treatment with 0.20 gL(-1) of Fe(0) nanoparticles. An increase in the reduction of Cr(VI) from 45% to 100% was noticed with the increase in the loading of Fe(0) nanoparticles from 0.05 to 0.20 gL(-1). Reaction kinetics of Cr(VI) reduction showed pseudo first-order kinetics with rate constant in the range of 1.1 × 10(-3) to 3.9 × 10(-3) min(-1). This work demonstrates the potential utility of Fe(0) nanoparticles in treatment and remediation of Cr(VI)-contaminated water source.

Removal of Lead by Nanoscale Zerovalent Iron in Surfacewater

“…The resulting image of nZVI shows that the size of nZVI was approximately 35.57-49.62 nm. It was uniformly aggregated to each other due the strong dipole-dipole magnetic of individual particles [9]. These results strongly confirmed that synthesized nZVI in this study was in nanoscales (<100 nm).…”

“…The earliest passive in situ treatment introduced is permeable reactive barriers (PRBs) using granular zerovalent iron, however this treatment significant fault is that it can only concentrate on contaminant plumes that flow through the barrier ergo they do not contribute to the active removal of the source [8]. Recent remediation technology which has proven its effectiveness in treating organic and inorganic contaminants is remediation using nanoscale zerovalent iron (nZVI) [8][9][10]. The aforementioned remediation technology is very effective in transforming halogenated organic compounds such as tetrachloroethene (PCE), trichloroethene (TCE), and carbon tetrachloride (CT) into chloride and capable of reducing heavy metals such as lead, uranium, and mercury [8,11].…”

“…The aforementioned remediation technology is very effective in transforming halogenated organic compounds such as tetrachloroethene (PCE), trichloroethene (TCE), and carbon tetrachloride (CT) into chloride and capable of reducing heavy metals such as lead, uranium, and mercury [8,11]. nZVI offers an advantage over conventional method because of its simplicity, unique physicochemical properties, and nontoxicity [9]. The high surface-to-volume ratio of nZVI stimulates mass transfer to and from the solid surface resulting in likelihood for contaminant degradation [9,12].…”

“…nZVI offers an advantage over conventional method because of its simplicity, unique physicochemical properties, and nontoxicity [9]. The high surface-to-volume ratio of nZVI stimulates mass transfer to and from the solid surface resulting in likelihood for contaminant degradation [9,12]. The reaction kinetic rate of nZVI is strongly dependent on the total reactive surface area of nZVI [9,11].…”

“…The high surface-to-volume ratio of nZVI stimulates mass transfer to and from the solid surface resulting in likelihood for contaminant degradation [9,12]. The reaction kinetic rate of nZVI is strongly dependent on the total reactive surface area of nZVI [9,11]. Muller et al state that the usage of nZVI technology is extensive in the United States and that there is no regulation and current laws regarding its usage, whereby in Europe took a precautionary attitude on the aforementioned technology albeit field applications conducted in Bornheim, Germany, Horice and Pisecna, Czech Republic produced a promising result in term of contaminants remediation [8].…”