Recently, there has been an increasing interest in using the photoreduction of resazurin by aliphatic amines such as hydroxylamine as a model reaction to assess the efficiency of metal nanoparticles as photocatalysts. However, some features of this reaction are still not understood well. In particular, one of the most important still misconstrued feature of resazurin photoreduction reaction is the lag time in the beginning of the reaction, when no turnover of resazurin is observed. This lag time is often known as the induction time. In order to understand the origin of the induction time, we investigate the factors governing the induction time associated with the reaction. We found that the concentrations of the hydroxylamine and the dissolved oxygen are most important factors influencing the induction time. In the ambient condition, the induction time for resazurin reduction reaction can be as long as 30 min in the absence of any catalyst. Decreasing the dissolved oxygen concentration or increasing the hydroxylamine concentration can significantly reduce the induction time. We attributed the induction time to a side reaction, autoxidation of hydroxylamine by dissolved oxygen. Interestingly, we found that the presence of metal nanocatalyst such as gold can also reduce the induction time. We concluded that in addition to catalyzing the photoreduction of resazurin, gold nanocatalyst can also accelerate the autoxidation reaction of hydroxylamine.

最近，人们越来越关注使用脂族胺（例如羟胺）对刃天青进行光还原作为模型反应来评估金属纳米颗粒作为光催化剂的效率。但是，该反应的某些特征仍未很好理解。特别地，当没有观察到刃天青的更新时，刃天青的光还原反应的最重要的仍然被误解的特征之一是反应开始时的滞后时间。该滞后时间通常称为感应时间。为了了解诱导时间的起源，我们研究了控制与反应相关的诱导时间的因素。我们发现羟胺和溶解氧的浓度是影响诱导时间的最重要因素。在环境条件下 在没有任何催化剂的情况下，刃天青还原反应的诱导时间可以长达30分钟。降低溶解氧浓度或增加羟胺浓度可以显着减少诱导时间。我们将诱导时间归因于副反应，即溶解氧使羟胺发生自氧化。有趣的是，我们发现金属纳米催化剂（例如金）的存在也可以减少诱导时间。我们得出的结论是，金纳米催化剂除了催化刃天青的光还原外，还可以促进羟胺的自氧化反应。我们将诱导时间归因于副反应，即溶解氧使羟胺发生自氧化。有趣的是，我们发现金属纳米催化剂（例如金）的存在也可以减少诱导时间。我们得出的结论是，金纳米催化剂除了催化刃天青的光还原外，还可以促进羟胺的自氧化反应。我们将诱导时间归因于副反应，即溶解氧使羟胺发生自氧化。有趣的是，我们发现金属纳米催化剂（例如金）的存在也可以减少诱导时间。我们得出的结论是，金纳米催化剂除了催化刃天青的光还原外，还可以促进羟胺的自氧化反应。