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Remediation of Chlorpyrifos-Contaminated Soils by Laboratory-Synthesized Zero-Valent Nano Iron Particles : Effect of pH and Aluminium Salts
Joint Authors
Reddy, K. Gangadhara
Madhavi, G.
Madhavi, V.
Reddy, A. Vijaya Bhaskar
Source
Issue
Vol. 2013, Issue 2013 (31 Dec. 2013), pp.1-7, 7 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-11-01
Country of Publication
Egypt
No. of Pages
7
Main Subjects
Abstract EN
Degradation of the insecticide chlorpyrifos in contaminated soils was investigated using laboratory synthesized zero-valent nano iron (ZVNI) particles.
The synthesized ZVNI particles were characterized as nanoscale sized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM).
The zero-valent state (Fe0) of iron was confirmed by EDAX analysis and the morphology of the ZVNI particles was studied by XRD.
Batch experiments were conducted by treating the chlorpyrifos contaminated soil with ZVNI, our results indicate that 90% of chlorpyrifos was degraded after 10 days of incubation.
Only 32% degradation was observed with micro zero-valent iron (mZVI) and no considerable degradation was attained without ZVNI.
The degradation of chlorpyrifos followed the first-order kinetics with a rate constant and a half-life of 0.245 day−1 and 2.82 days, respectively.
Degradation was monitored at two different pH values, that is, pH 10 and pH 4.
Chlorpyrifos degradation rate constant increased as the pH decreases from 10 to 4.
The corresponding rate constant and half-lives were 0.43 day−1 and 1.57days for pH 4, 0.18 day−1 and 3.65 days for pH 10.
In addition, an attempt was made by augmenting Al2(SO4)3 with ZVNI and it was found that the degradation rate of chlorpyrifos was greatly enhanced and the rate constant was rapidly increased from 0.245 day−1 to 0.60 day−1.
Hydrolysis and stepwise dechlorination pathway of chlorpyrifos with ZVNI was the dominant reaction.
American Psychological Association (APA)
Reddy, A. Vijaya Bhaskar& Madhavi, V.& Reddy, K. Gangadhara& Madhavi, G.. 2012. Remediation of Chlorpyrifos-Contaminated Soils by Laboratory-Synthesized Zero-Valent Nano Iron Particles : Effect of pH and Aluminium Salts. Journal of Chemistry،Vol. 2013, no. 2013, pp.1-7.
https://search.emarefa.net/detail/BIM-478316
Modern Language Association (MLA)
Reddy, A. Vijaya Bhaskar…[et al.]. Remediation of Chlorpyrifos-Contaminated Soils by Laboratory-Synthesized Zero-Valent Nano Iron Particles : Effect of pH and Aluminium Salts. Journal of Chemistry No. 2013 (2013), pp.1-7.
https://search.emarefa.net/detail/BIM-478316
American Medical Association (AMA)
Reddy, A. Vijaya Bhaskar& Madhavi, V.& Reddy, K. Gangadhara& Madhavi, G.. Remediation of Chlorpyrifos-Contaminated Soils by Laboratory-Synthesized Zero-Valent Nano Iron Particles : Effect of pH and Aluminium Salts. Journal of Chemistry. 2012. Vol. 2013, no. 2013, pp.1-7.
https://search.emarefa.net/detail/BIM-478316
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-478316