Reductive dechlorination of gamma-hexachlorocyclohexane using Fe-Pd bimetallic nanoparticles

Journal of Hazardous Materials
Varima NagpalKishore M Paknikar

Abstract

Nanoscale Fe-Pd bimetallic particles were synthesized and used for degradation of lindane (gamma-hexachlorocyclohexane) in aqueous solution. Batch studies showed that 5mg/L of 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 (approximately 1.6m(2)/g); and, (2) increased catalytic reactivity due to the presence of Pd on the surface. Recycling and column studies showed that these nanoparticles exhibit efficient and sustained catalytic activity.

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Citations

May 23, 2013·Journal of Hazardous Materials·Ritu SinghVirendra Misra
Mar 6, 2012·Water, Air, and Soil Pollution·Chicgoua NoubactepRichard Crane
Jan 1, 2013·Chemosphere·Xiaoqin NieYongfeng Nie
Jul 20, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Fernanda D GuerraFrank Alexis
Feb 3, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Abdellatif MoujahidFei Yan
Feb 4, 2019·Environmental Science and Pollution Research International·Yufeng SunAimin Zhang

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