Abstract Noble metal nanoparticles have been drawing great attention for the treatment of water pollutants. The catalytic activity of noble metal nanoparticles is usually reduced due to their aggregation. Amphiphilic molecule micelles have potential to stabilize the noble nanoparticles against aggregation. In this study, a novel facile method was reported for preparing polyethyleneimine-oleic acid (PEI-oleic acid) micelle-stabilized gold nanoparticles (PO-AuNPs n ), where the gold nanoparticles (AuNPs) were embedded in the shell area of micelles. When the molar ratio of [N] to [Au] was 50, 100, and 200, the mean diameter of AuNPs was 3.52 ± 0.42, 3.11 ± 0.28, and 2.85 ± 0.48 nm, respectively. The corresponding zeta potential of the PO-AuNPs n was determined to be 26.2, 28.9 and 35.7 mV, respectively. Furthermore, PO-AuNPs n remained stable in aqueous solution at room temperature for more than 1 month. More importantly, PO-AuNPs n had higher catalytic activity for 4-nitrophenol (4-NP) reduction in aqueous solution compared with previous reports, where PO-AuNPs 200 showed a K nor value of 9367 s −1 g −1 . It is believed that PO-AuNPs n showed high catalytic activity because of their small size, high stability, and the location of AuNPs in the shell area, which made it easier for AuNPs to contact with 4-NP. The method described in this report represents a new method to prepare small and stable noble metal nanoparticles for catalytic applications in the future.

中文翻译：

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聚乙烯亚胺-油酸胶束稳定的金纳米粒子用于还原 4-硝基苯酚并提高性能

摘要 贵金属纳米粒子在水污染物处理方面受到了广泛关注。贵金属纳米颗粒的催化活性通常会由于它们的聚集而降低。两亲分子胶束具有稳定贵重纳米颗粒以防止聚集的潜力。在这项研究中，报道了一种制备聚乙烯亚胺-油酸（PEI-油酸）胶束稳定的金纳米粒子（PO-AuNPs n ）的新方法，其中金纳米粒子（AuNPs）嵌入胶束的壳区。当 [N] 与 [Au] 的摩尔比为 50、100 和 200 时，AuNPs 的平均直径分别为 3.52 ± 0.42、3.11 ± 0.28 和 2.85 ± 0.48 nm。PO-AuNPs n 的相应 zeta 电位分别确定为 26.2、28.9 和 35.7 mV。此外，PO-AuNPs n 在室温下在水溶液中保持稳定超过 1 个月。更重要的是，与之前的报道相比，PO-AuNPs n 对水溶液中 4-硝基苯酚 (4-NP) 的还原具有更高的催化活性，其中 PO-AuNPs 200 的 K 值和 9367 s -1 g -1 值。人们认为PO-AuNPs n由于其尺寸小、稳定性高以及AuNPs在壳区的位置而表现出很高的催化活性，这使得AuNPs更容易与4-NP接触。本报告中描述的方法代表了一种制备小而稳定的贵金属纳米粒子以用于未来催化应用的新方法。其中 PO-AuNPs 200 的 K 值和值都为 9367 s -1 g -1 。人们认为PO-AuNPs n由于其尺寸小、稳定性高以及AuNPs在壳区的位置而表现出很高的催化活性，这使得AuNPs更容易与4-NP接触。本报告中描述的方法代表了一种制备小而稳定的贵金属纳米粒子以用于未来催化应用的新方法。其中 PO-AuNPs 200 的 K 值和值都为 9367 s -1 g -1 。人们认为PO-AuNPs n由于其尺寸小、稳定性高以及AuNPs在壳区的位置而表现出很高的催化活性，这使得AuNPs更容易与4-NP接触。本报告中描述的方法代表了一种制备小而稳定的贵金属纳米粒子以用于未来催化应用的新方法。