催化学报

催化学报 ›› 2012, Vol. 33 ›› Issue (8): 1306-1311.DOI: 10.1016/S1872-2067(11)60410-5

• 研究论文 • 上一篇    下一篇

Kinetics of Oxidation of L-Leucine by Mono- and Bimetallic Gold and Silver Nanoparticles in Hydrogen Peroxide Solution

P. VENKATESAN, J. SANTHANALAKSHMI*   

  1. Department of Physical Chemistry, University of Madras, Guindy Campus, A. C. Tech, Chennai 600 025, Tamil Nadu, India
  • 收稿日期:2011-11-30 修回日期:2012-04-27 出版日期:2012-08-01 发布日期:2012-08-01

Kinetics of Oxidation of L-Leucine by Mono- and Bimetallic Gold and Silver Nanoparticles in Hydrogen Peroxide Solution

P. VENKATESAN, J. SANTHANALAKSHMI*   

  1. Department of Physical Chemistry, University of Madras, Guindy Campus, A. C. Tech, Chennai 600 025, Tamil Nadu, India
  • Received:2011-11-30 Revised:2012-04-27 Online:2012-08-01 Published:2012-08-01

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被引次数

5

摘要： The catalytic activity of surfactant stabilized mono- and bimetallic Au and Ag nanoparticles for the oxidation of an amino acid, L-leucine, was studied using hydrogen peroxide as the oxidant. The Au and Ag nanoparticle catalysts exhibited very good catalytic activity and the kinetics of the reaction were found to be pseudo-first order with respect to the amino acid. The effects of several factors, such as oxidant concentration, ionic strength, pH, and catalyst concentration on the reaction, were also investigated. In particular, optimal oxidant and catalyst concentrations were determined. Very high concentrations of the metal nano-catalysts or the oxidant led to a dramatic increase in reaction rate. Moreover, bimetallic Au-Ag catalysts provided higher selectivity than pure Au or Ag.

关键词: gold nanoparticle, silver nanoparticle, gold/silver bimetallic nanoparticle, oxidation of α-amino acid, leucine, hydrogen peroxide, kinetic study

Abstract: The catalytic activity of surfactant stabilized mono- and bimetallic Au and Ag nanoparticles for the oxidation of an amino acid, L-leucine, was studied using hydrogen peroxide as the oxidant. The Au and Ag nanoparticle catalysts exhibited very good catalytic activity and the kinetics of the reaction were found to be pseudo-first order with respect to the amino acid. The effects of several factors, such as oxidant concentration, ionic strength, pH, and catalyst concentration on the reaction, were also investigated. In particular, optimal oxidant and catalyst concentrations were determined. Very high concentrations of the metal nano-catalysts or the oxidant led to a dramatic increase in reaction rate. Moreover, bimetallic Au-Ag catalysts provided higher selectivity than pure Au or Ag.

Key words: gold nanoparticle, silver nanoparticle, gold/silver bimetallic nanoparticle, oxidation of α-amino acid, leucine, hydrogen peroxide, kinetic study