硼氢化钠
硼氢化
化学
催化作用
氧化还原
胶体金
无机化学
反应速率
活化能
反应级数
水溶液
还原剂
胶体
胶体金
纳米颗粒
动力学
反应速率常数
物理化学
纳米技术
材料科学
有机化学
物理
量子力学
作者
Susana Carregal‐Romero,Jorge Pérez‐Juste,Pablo Hervés,Luis M. Liz‐Marzán,Paul Mulvaney
出处
期刊:Langmuir
[American Chemical Society]
日期:2009-10-14
卷期号:26 (2): 1271-1277
被引量:100
摘要
We report results on the large catalytic effect of spherical gold nanoparticles on the rate of reduction of hexacyanoferrate (III) by sodium borohydride in aqueous solution. Because the gold nanoparticles remain stable and no aggregation takes place during the reaction, it can be monitored until completion. The presence of colloidal gold leads to a considerable increase in the observed reaction rate and to a change in the order of reaction. The reaction is first-order with respect to the hexacyanoferrate (III) concentration and gold particle concentration, but the reaction order with respect to borohydride ion is more complex. The activation energy is found to be 15 kJ/mol for 15 nm gold particles. The redox reaction is activation-controlled under most conditions, but the rate of reaction approaches the diffusion limit for higher borohydride concentrations and is over 104 times faster than in the absence of the gold catalyst.
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