在本文中,使用自组装技术制造了一种通用的异质纳米催化剂。开始,使用Stobbers方法用SiO2薄层涂覆Fe3O4MNPs。随后,表面用3-CPMS进一步功能化,随后与席夫碱反应。最后,镍NPs通过原位沉积沉积在表面上,形成Fe3O4@SiO2@3-CPMS@L-Ni磁性纳米催化剂。这种磁性纳米催化剂的结构经过一系列复杂的技术精心表征:XRD,FT-IR,SEM,TEM,BET和VSM。XRD衍射图证实了Fe3O4MNPs的存在,SiO2和Ni峰,为成功合成提供证据。此外,通过在合成的纳米催化剂的FTIR光谱中存在氮甲烷峰证明了用希夫碱的成功官能化。制造的纳米催化剂被巧妙地用于4-NP的还原,NB,和MO表现出显著提高的催化效率。此外,这种催化剂可以通过外部磁铁的应用毫不费力地回收,它在至少连续六个循环中保持了催化能力。利用水作为环保溶剂,加上利用丰富且具有成本效益的镍催化剂代替昂贵的Pd或Pt催化剂,随着催化剂的成功回收和可扩展性,使这种方法从环境和经济的角度高度有利于减少4-NP,NB,和MO。
In this paper, a versatile heterogeneous nanocatalyst was fabricated employing a self-assembly technique. To commence, Fe3O4 MNPs were coated with a thin layer of SiO2 using the stobbers method. Subsequently, the surface was further functionalized with 3-CPMS, followed by a reaction with a Schiff base. Finally, nickel NPs were deposited on the surface through in situ deposition, forming the Fe3O4@SiO2@3-CPMS@L-Ni magnetic nanocatalyst. The architecture of this magnetic nanocatalyst was meticulously characterized through an array of sophisticated techniques: XRD, FT-IR, SEM, TEM, BET and VSM. The XRD diffraction pattern confirmed the presence of Fe3O4 MNPs, SiO2, and Ni peaks, providing evidence for successful synthesis. Moreover, the successful functionalization with a Schiff base was demonstrated by the presence of an azomethane peak in the FTIR spectra of the synthesized nanocatalyst. The fabricated nanocatalyst was adeptly utilized for the reduction of 4-NP, NB, and MO demonstrating a remarkably elevated rate of catalytic efficacy. Moreover, this catalyst was effortlessly retrievable through the application of an external magnet, and it maintained its catalytic prowess across at least six consecutive cycles. The utilization of water as an environmentally friendly solvent, coupled with the utilization of abundant and cost-effective nickel catalyst instead of the costly Pd or Pt catalysts, along with the successful recovery and scalability of the catalyst, render this method highly advantageous from both environmental and economic perspectives for the reduction of 4-NP, NB, and MO.