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Kinetic analysis of the hydrolysis of methyl parathion using citrate-stabilized 10 nm gold nanoparticles.
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- Author(s): Nita, Rafaela1; Trammell, Scott A.2; Ellis, Gregory A.3; Moore, Martin H.2; Soto, Carissa M.2; Leary, Dagmar H.2; Fontana, Jake2; Talebzadeh, Somayeh F.1; Knight, D. Andrew1
- Source:
Chemosphere. Feb2016, Vol. 144, p1916-1919. 4p.
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- Abstract:
“Ligand-free” citrate-stabilized 10 nm gold nanoparticles (AuNPs) promote the hydrolysis of the thiophosphate ester methyl parathion (MeP) on the surface of gold as a function of pH and two temperature values. At 50 °C, the active surface gold atoms show catalytic turnover ∼4 times after 8 h and little turnover of gold surface atoms at 25 °C with only 40% of the total atoms being active. From Michaelis–Menten analysis, k cat increases between pH 8 and 9 and decreases above pH 9. A global analysis of the spectral changes confirmed the stoichiometric reaction at 25 °C and the catalytic reaction at 50 °C and mass spectrometry confirmed the identity of p -nitrophenolate ( PNP ) product. Additional decomposition pathways involving oxidation and hydrolysis independent of the formation of PNP were also seen at 50 °C for both catalyzed and un-catalyzed reactions. This work represents the first kinetic analysis of ligand-free AuNP catalyzed hydrolysis of a thiophosphate ester. [ABSTRACT FROM AUTHOR]
- Abstract:
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