Study of one-step photosynthesis of Ag nanoparticles.
Study of one-step photosynthesis of Ag nanoparticles.
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DOI：
10.1016/j.saa.2018.05.089
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发表时间：
2018-10
期刊：
影响因子：
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通讯作者：
F. Zhao;Guanghua Ren;Canhua Zhou;Yang Yang-Yang
中科院分区：
文献类型：
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作者：
F. Zhao;Guanghua Ren;Canhua Zhou;Yang Yang-Yang
在芳香酮系统中金属纳米粒子（NP）的光合作用过程中，芳香酮三联体被探索作为氢原子/电子抽象剂，产生高反应性自由基。然而，它们的电子捐赠能力却很少得到认可。在这里，我们报告了使用光谱和理论方法在无氢供体系统中二苯甲酮（BP）引发的银纳米粒子的一步光合作用的研究。实验上，通过过境和稳态吸收光谱对BP阳离子自由基(BP+·)和Ag NPs的直接观察证明了BP三重态的电子供给能力，将Ag+直接还原为Ag0。在接下来的反应中，理论计算和实验结果都表明，生成的BP+··通过从NO3−中夺取电子而恢复为BP，生成的硝酸根(NO3·)随后衰变成氮氧化物。值得注意的是，BP 在我们的系统中起着光催化剂的作用。这项研究详细介绍了银纳米粒子的一步光合作用机制，为光化学中芳香酮提供了新的见解，并可能为金属纳米粒子的光合作用提供一种简便的方法。
During photosynthesis of metal nanoparticles (NPs) in aromatic ketone systems, the aromatic ketone triplets are explored as hydrogen atom/electron abstractors which yield highly reactive radicals. However, their electron donation ability is sparsely recognized. Here we report the investigations of benzophenone (BP)-initiated one-step photosynthesis of Ag NPs in H donor free system using spectroscopic and theoretical methods. Experimentally, the direct observations of BP cation radical (BP+·) and Ag NPsviatransit and steady-state absorption spectroscopy demonstrate the electron donation ability of BP triplets which directly reduce Ag+to Ag0. In the following reactions, both theoretical calculation and experimental results reveal that the generated BP+·recovers itself to BP by grabbing an electron from NO3−and the generated nitrate radicals (NO3·) then decay to nitrogen oxides. Notably, BP plays a role as photocatalyst in our system. This study details the mechanism of one-step photosynthesis of Ag NPs which provides a new insight of aromatic ketones in photochemistry and may offer a facile approach to photosynthesis of metal NPs.