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Designing an efficient heterogeneous photo-catalyst based on ZnO nanoparticles as support in a carbonaceous network
Journal of Environmental Chemical Engineering ( IF 7.7 ) Pub Date : 2021-01-14 , DOI: 10.1016/j.jece.2021.105086
Leila Jameie , Alireza Shahzeydi , Mehran Ghiaci , Mingxuan Sun

Research on developing efficient catalysts can be considered as one of the biggest tasks in chemistry. In this study, diverse amounts of Ag-Pd nanoparticles loaded on ZnO nanoparticles buried in carbonaceous networks (denoted as Ag-Pd/ZnO@C) were synthesized by the incomplete calcination of polyvinylpyrrolidone at 400 °C. The fabricated catalysts were applied for the reduction of 4-nitrophenol to 4-aminophenol at room temperature in the presence of NaBH4 under two different conditions (dark and visible light irradiation). Transformation of polymer chains to carbonaceous networks acted as a tight frame around nanoparticles, helping the separation of the catalyst from the reaction medium. Also, it could promote the catalytic efficiency by increasing the transfer rate of the active hydrogen species to 4-nitrophenolate ions. In this study, the best performance composite Ag10-Pd5/ZnO@C0.5 (subscripts represent the amounts of the applied raw materials) exhibited the rate constant k = 0.61 min−1 and TOF = 117.9 h−1 for reducing 4-nitrophenol to 4-aminophenol in dark conditions. Moreover, the synthesized composites showed a higher catalytic activity in comparison to the other reported catalysts, which could be used as the photo-catalysts at the visible light irradiation. The rate constant and TOF of the best performance composite were increased to 0.84 min−1 and 153.4 h−1, respectively, in the presence of the visible light at room temperature. Therefore, this work could open a new route for the preparation of highly active surface catalysts based on nanoparticles as support.



中文翻译:

设计基于ZnO纳米粒子作为碳质网络载体的高效多相光催化剂

开发高效催化剂的研究可以被视为化学领域的最大任务之一。在这项研究中,通过将聚乙烯吡咯烷酮在400°C下不完全煅烧,合成了多种负载在埋在碳网络中的ZnO纳米颗粒上的Ag-Pd纳米颗粒(表示为Ag-Pd / ZnO @ C)。所制备的催化剂用于在存在两种不同条件(暗光和可见光辐射)的情况下,在NaBH4存在下于室温下将4-硝基苯酚还原为4-氨基苯酚。聚合物链向碳质网络的转变充当纳米颗粒周围的紧密框架,有助于催化剂从反应介质中分离出来。而且,它可以通过增加活性氢物质向4-硝基苯酚离子的转移速率来提高催化效率。在这个研究中,-1和TOF = 117.9 h -1,用于在黑暗条件下将4-硝基苯酚还原为4-氨基苯酚。而且,与其他报道的催化剂相比,合成的复合材料显示出更高的催化活性,其可以用作可见光照射下的光催化剂。在室温下存在可见光的情况下,性能最佳的复合材料的速率常数和TOF分别增加到0.84 min -1和153.4 h -1。因此,这项工作可以为制备基于纳米粒子作为载体的高活性表面催化剂开辟一条新途径。

更新日期:2021-01-22
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