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Remediation of γ-Hexachlorocyclohexane Contaminated Soil Using Nanoscale Zero-Valent Iron

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Abstract:

γ-Hexachlorocyclohexane (γ-HCH), an organochlorine pesticide is of immense concern for human health and the environment because of its low aqueous solubility, high stability, lipophilicity and recalcitrant nature. Nanoscale zero-valent iron (nZVI) has been shown to effectively transform chlorinated organic compounds. In view of this an attempt has been made to explore the potential of nZVI for the remediation of γ-HCH spiked soil. For this batch experiments were conducted to test the degradation potential of γ-HCH using various concentration of nZVI ranging from 0.20 g L–1 to 2.0 g L–1. Analysis of the data showed complete disappearance of 10 μg g–1 of γ-HCH within 24 hours at nZVI concentration of 1.6 g L–1, indicating its possible use in environmental cleanup. Kinetic studies revealed that nZVI mediated γ-HCH degradation follows pseudo first order kinetic model with a degradation rate constant of 7.02 × 10–1 h–1 at nZVI concentration of 1.6 g L–1 and 7.2 pH. Gas chromatographic analysis showed the formation of benzene as the final degradation product of γ-HCH. Factors such as pH and reaction time likely to affect the degradation efficacy of nZVI have also been studied. It was found that lower pH and increase in reaction time assist nZVI in the degradation of γ-HCH. The role of nZVI in the remediation of γ-HCH contaminated soil has been discussed.

Keywords: NANOSCALE ZERO-VALENT IRON; REMEDIATION; γ-HCH

Document Type: Research Article

DOI: https://doi.org/10.1166/jbns.2011.1039

Publication date: 2011-06-01

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  • Bionanoscience attempts to harness various functions of biological macromolecules and integrate them with engineering for technological applications. It is based on a bottom-up approach and encompasses structural biology, biomacromolecular engineering, material science, and engineering, extending the horizon of material science. The journal aims at publication of (i) Letters (ii) Reviews (3) Concepts (4) Rapid communications (5) Research papers (6) Book reviews (7) Conference announcements in the interface between chemistry, physics, biology, material science, and technology. The use of biological macromolecules as sensors, biomaterials, information storage devices, biomolecular arrays, molecular machines is significantly increasing. The traditional disciplines of chemistry, physics, and biology are overlapping and coalescing with nanoscale science and technology. Currently research in this area is scattered in different journals and this journal seeks to bring them under a single umbrella to ensure highest quality peer-reviewed research for rapid dissemination in areas that are in the forefront of science and technology which is witnessing phenomenal and accelerated growth.
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