Reductive dechlorination of gamma-hexachlorocyclohexane using Fe-Pd bimetallic nanoparticles.
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.
Nagpal
Varima
V
Center for Nanobioscience, Agharkar Research Institute, G.G. Agarkar Road, Pune 411004, Maharashtra, India.
Bokare
Alok D
AD
Chikate
Rajeev C
RC
Rode
Chandrashekhar V
CV
Paknikar
Kishore M
KM
D002384:Catalysis; D002713:Chlorine / Q000737:chemistry / Q000302:isolation & purification*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D001556:Hexachlorocyclohexane / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D046529:Microscopy, Electron, Transmission / Q000379:methods; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods; D010165:Palladium / Q000737:chemistry*; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D014874:Water Pollutants, Chemical; D002713:Chlorine; D001556:Hexachlorocyclohexane; D010165:Palladium; D007501:Iron