Serginay Nuray, Bingol Mehmet Semih, Karatas Erkan, Yilmaz Mehmet
Department of Nanoscience and Nanoengineering, Atatürk University, Erzurum 25030, Turkiye.
East Anatolia High Technology Application and Research Center, Atatürk University, Erzurum 25030, Turkiye.
ACS Omega. 2024 Dec 18;9(52):51163-51174. doi: 10.1021/acsomega.4c06968. eCollection 2024 Dec 31.
In this paper, we present a facile yet effective method for the fabrication of core-shell nanoparticles (NPs) of magnetite (FeO) and polydopamine (FeO@PDA) and their decoration with a tunable amount of gold NPs (AuNPs). For this, FeO NPs were fabricated through the polyol method and AuNPs were deposited onto FeO@PDA via anchoring of as-prepared citrate-stabilized AuNPs or reduction of Au ions. PDA with its numerous catechol groups enabled the decoration of AuNPs in a well-controlled manner. The resultant FeO@PDA@Au nanosystem exhibited highly efficient catalytic activity in removing crystal violet (CV) and malachite green (MG) as dye molecules. It was noticed that the quantity of deposited AuNPs was the primary determinant of the resulting catalytic activity of the suggested system. Both techniques resulted in NP systems demonstrating distinct catalytic activity with reaction constant values of 0.83 and 1.54 min for removing CV and MG dyes, respectively. The complete dye removals were attained only within 4 min. Furthermore, the core-shell nanosystem was easily regenerated by removing it from the medium via an external magnet and subsequent washing. Even after five cycles, the catalytic system provided satisfying activity in both dyes indicating its high reusability capacity. The combination of AuNPs with distinct characteristics of PDA and magnetic NPs makes this core-shell nanosystem a viable platform for various catalytic and wastewater applications.
在本文中，我们提出了一种简便而有效的方法来制备磁铁矿（FeO）和聚多巴胺（FeO@PDA）的核壳纳米颗粒（NPs），并使用可调数量的金纳米颗粒（AuNPs）对其进行修饰。为此，通过多元醇法制备了FeO NPs，并通过锚定制备好的柠檬酸盐稳定的AuNPs或将Au离子还原，将AuNPs沉积到FeO@PDA上。具有众多邻苯二酚基团的PDA能够以良好控制的方式修饰AuNPs。所得的FeO@PDA@Au纳米系统在去除作为染料分子的结晶紫（CV）和孔雀石绿（MG）方面表现出高效的催化活性。值得注意的是，沉积的AuNPs的数量是所建议系统最终催化活性的主要决定因素。两种技术都导致NP系统表现出不同的催化活性，去除CV和MG染料的反应常数分别为0.83和1.54 min。仅在4分钟内就实现了染料的完全去除。此外，通过用外部磁铁将核壳纳米系统从介质中取出并随后洗涤，可以轻松地对其进行再生。即使经过五个循环，催化系统在两种染料中仍具有令人满意的活性，表明其具有很高的可重复使用能力。具有独特特性的AuNPs与PDA和磁性NPs的结合，使这种核壳纳米系统成为各种催化和废水处理应用的可行平台。
