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用咖啡酸合成的金纳米颗粒催化还原4-硝基苯酚。

Catalytic reduction of 4-nitrophenol with gold nanoparticles synthesized by caffeic acid.

作者信息

Seo Yu Seon, Ahn Eun-Young, Park Jisu, Kim Tae Yoon, Hong Jee Eun, Kim Kyeongsoon, Park Yohan, Park Youmie

机构信息

College of Pharmacy and Inje Institute of Pharmaceutical Sciences and Research, Inje University, 197 Inje-ro, Gimhae, Gyeongnam, 50834, Republic of Korea.

Department of Pharmaceutical Engineering, Inje University, 197 Inje-ro, Gimhae, Gyeongnam, 50834, Republic of Korea.

出版信息

Nanoscale Res Lett. 2017 Dec;12(1):7. doi: 10.1186/s11671-016-1776-z. Epub 2017 Jan 5.

DOI:10.1186/s11671-016-1776-z
PMID:28058640
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5216008/
Abstract

In this study, various concentrations of caffeic acid (CA) were used to synthesize gold nanoparticles (CA-AuNPs) in order to evaluate their catalytic activity in the 4-nitrophenol reduction reaction. To facilitate catalytic activity, caffeic acid was removed by centrifugation after synthesizing CA-AuNPs. The catalytic activity of CA-AuNPs was compared with that of centrifuged CA-AuNPs (cf-CA-AuNPs). Notably, cf-CA-AuNPs exhibited up to 6.41-fold higher catalytic activity compared with CA-AuNPs. The catalytic activity was dependent on the caffeic acid concentration, and the lowest concentration (0.08 mM) produced CA-AuNPs with the highest catalytic activity. The catalytic activities of both CA-AuNPs and cf-CA-AuNPs decreased with increasing caffeic acid concentration. Furthermore, a conversion yield of 4-nitrophenol to 4-aminophenol in the reaction mixture was determined to be 99.8% using reverse-phase high-performance liquid chromatography. The product, 4-aminophenol, was purified from the reaction mixture, and its structure was confirmed by H-NMR. It can be concluded that the removal of the reducing agent, caffeic acid in the present study, significantly enhanced the catalytic activity of CA-AuNPs in the 4-nitrophenol reduction reaction.

摘要

在本研究中，使用不同浓度的咖啡酸（CA）来合成金纳米颗粒（CA-AuNPs），以评估它们在4-硝基苯酚还原反应中的催化活性。为了促进催化活性，在合成CA-AuNPs后通过离心去除咖啡酸。将CA-AuNPs的催化活性与离心后的CA-AuNPs（cf-CA-AuNPs）的催化活性进行比较。值得注意的是，与CA-AuNPs相比，cf-CA-AuNPs的催化活性高出6.41倍。催化活性取决于咖啡酸的浓度，最低浓度（0.08 mM）产生的CA-AuNPs具有最高的催化活性。CA-AuNPs和cf-CA-AuNPs的催化活性均随咖啡酸浓度的增加而降低。此外，使用反相高效液相色谱法测定反应混合物中4-硝基苯酚向4-氨基苯酚的转化率为99.8%。从反应混合物中纯化产物4-氨基苯酚，并通过H-NMR确认其结构。可以得出结论，在本研究中去除还原剂咖啡酸显著提高了CA-AuNPs在4-硝基苯酚还原反应中的催化活性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ebad/5216008/0958422eef89/11671_2016_1776_Fig7_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ebad/5216008/c17188b3772b/11671_2016_1776_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ebad/5216008/017a2f3a53df/11671_2016_1776_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ebad/5216008/0958422eef89/11671_2016_1776_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ebad/5216008/df700399be4d/11671_2016_1776_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ebad/5216008/ce5421c40400/11671_2016_1776_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ebad/5216008/cf6f16620c81/11671_2016_1776_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ebad/5216008/5d31665c3ab2/11671_2016_1776_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ebad/5216008/c17188b3772b/11671_2016_1776_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ebad/5216008/017a2f3a53df/11671_2016_1776_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ebad/5216008/0958422eef89/11671_2016_1776_Fig7_HTML.jpg

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