Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 175, Issue 1-3, Pages 680-687Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2009.10.063
Keywords
Bimetallic; Nanoparticles; Lindane; Degradation; Kinetics; Cyclohexane
Categories
Funding
- Council of Scientific and Industrial Research, Government of India
- Nano Cutting Edge Technology Pvt. Ltd.
- Agharkar Research Institute
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Nanoscale Fe-Pd bimetallic particles were synthesized and used for degradation of lindane (gamma-hexachlorocyclohexane) in aqueous solution. Batch studies showed that 5 mg/Lof lindane was completely dechlorinated within 5 min at a catalyst loading of 0.5 g/L and the degradation process followed first-order kinetics. GC-MS analysis in corroboration with GC-ECD results showed the presence of cyclohexane as the final degradation product. The proposed mechanism for the reductive dechlorination of lindane involves Fe corrosion-induced hydrogen atom transfer from the Pd Surface. The enhanced degradation efficiency of Fe-Pd nanoparticles is attributed to: (1) high specific surface area of the nanoscale metal particles (60 m(2)/g), manyfold greater that of commercial grade micro- or milli-scale iron particles (similar to 1.6 m(2)/g); and, (2) increased catalytic reactivity due to the presence of I'd on the Surface. Recycling and column studies showed that these nanoparticles exhibit efficient and sustained catalytic activity. (C) 2009 Elsevier B.V. All rights reserved.
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