Nano-Polyoxotungstate [Cu20P8W48] Immobilized on Magnetic Nanoparticles as an Excellent Heterogeneous Catalyst Nanoreactors for Green Reduction of Nitrophenol Compounds

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-05-26 DOI:10.1155/2022/7019037

Reza Haddad, Ali Roostaie

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引用次数: 0

Abstract

In this study, Cu20-polyoxotungstate [Cu20Cl(OH)24(H2O)12(P8W48O184)]25− supported on a magnetic substrate was used as a high-performance green method for the reduction of nitrophenol compounds such as 4-nitrophenol (4-NP) and 2,4,6-trinitrophenol (2,4,6-TNP). [Fe3O4@SiO2-NH2-Cu20P8W48] as heterogeneous magnetic nanocatalyst was synthesized and characterized by FT-IR, SEM, TEM, VSM, and TGA. This nanocatalyst has an excellent efficiency in the reduction of nitrophenol compounds to aminophenol compounds. The UV-Vis absorption spectrum is used at different times to evaluate the progress of the reaction. Under optimal conditions, 100% conversion and selectivity in reduction of 4-NP and 2,4,6-TNP to 4-AP and 2,4,6-TAP were obtained, respectively. In addition, after the reaction, the [Fe3O4@SiO2-NH2-Cu20P8W48] was recovered using an external magnetic field and used for the next cycle. The results showed that the nanocatalyst can perform eight consecutive cycles without any significant decrease in efficiency. In the end, according to the results, the proposed mechanism for this reaction was reported.

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磁性纳米颗粒固定化纳米多氧化钨酸盐[Cu20P8W48]绿色还原硝基酚类化合物

在本研究中，将cu20 -多氧钨酸盐[Cu20Cl(OH)24(H2O)12(P8W48O184)]25−负载在磁性衬底上，作为一种高效的绿色还原方法，用于还原4-硝基苯酚(4- np)和2,4,6-三硝基苯酚(2,4,6- tnp)等硝基酚类化合物。[Fe3O4@SiO2-NH2-Cu20P8W48]为非均相磁性纳米催化剂，并通过FT-IR、SEM、TEM、VSM和TGA对其进行了表征。该纳米催化剂在将硝基酚类化合物还原为氨基酚类化合物方面具有优异的效率。在不同时间用紫外-可见吸收光谱来评价反应的进展。在最佳条件下，4 - np和2,4,6- tnp还原为4- ap和2,4,6- tap的转化率和选择性分别为100%。此外，反应结束后，使用外部磁场回收[Fe3O4@SiO2-NH2-Cu20P8W48]并用于下一个循环。结果表明，该纳米催化剂可连续循环8次，效率无明显下降。最后，根据实验结果，提出了该反应的机理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.