The catalytic oxidation of methylene blue was investigated in the presence of dendrimer generation five terminated NH₂ encapsulated silver (AgDENs), and gold (AuDENs) nanoparticles as catalyst. The synthesis process of encapsulated metal nanoparticles were monitored by UV/vis spectrophotometry and their average diameters determined by transmission electron microscopy analysis, respectively. The kinetics was monitored using UV/vis spectrophotometry, under pseudo-first order conditions, resulting in observed rate constants k_obs. Langmuir–Hinshelwood approach was applied to model the kinetic process. The adsorption of methylene blue on the catalyst surface is related to the type of metal nanoparticle present, and presents the rate-determining step.

中文翻译：

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树枝状大分子包裹的银和金纳米粒子催化氧化亚甲基蓝。

在存在树枝状大分子的情况下研究了亚甲基蓝的催化氧化反应，该树状大分子产生了五个封端的NH ₂包封的银（AgDENs）和金（AuDENs）纳米粒子作为催化剂。通过紫外/可见分光光度法监测包封的金属纳米颗粒的合成过程，并通过透射电子显微镜分析分别确定其平均直径。在伪一级反应条件下，使用UV / vis分光光度法监测动力学，得到观察到的速率常数k _obs。Langmuir–Hinshelwood方法用于动力学过程建模。亚甲基蓝在催化剂表面上的吸附与存在的金属纳米颗粒的类型有关，并提出了速率确定步骤。