Catalysts and Organic Synthesis Research Laboratory, Department of Chemistry, Iran University of Science and Technology, 16846-13114, Tehran, Iran.
Sci Rep. 2020 Jul 15;10(1):11671. doi: 10.1038/s41598-020-68426-z.
Geopolymers as aluminosilicate inorganic polymers and eco-friendly building materials which can be used as substrate for different kinds of composite. In this research, according to the fabrication of geopolymer based on bentonite as a substrate and embedment of NiFeO nanoparticles in the construction of this polymer, the synthesis of a new magnetic nanocomposite (NiFeO/geopolymer) was investigated for the first time. In order to describe its chemistry and morphology features, different analyses such as Fourier transform infrared spectroscopy, field-emission scanning electron microscopy and transmission electron microscopy images, Brunauer-Emmet-Teller adsorption-desorption isotherm, X-ray diffraction pattern, energy-dispersive X-ray analysis, thermogravimetric analysis, and vibrating-sample magnetometer analysis were used. The application of this novel nanocatalyst was studied for one-pot three-component condensation reaction of substituted imidazole derivatives by accelerated ultrasonic irradiations. Compared to the other conventional catalysts which were used for the synthesis of imidazole derivatives, the green synthesis method for fabrication of this heterogeneous and magnetic nanocatalyst, its high thermal stability, being eco-friendly, noticeable efficiency and easy reusability have become privileges to be superior.
水硬硅钙石基无机聚合物是一种具有环保特性的建筑材料，可以作为各种复合材料的基体。在本研究中，我们以膨润土为基体，通过嵌入 NiFeO 纳米粒子来制备水硬硅钙石，首次合成了一种新型的磁性纳米复合材料（NiFeO/水硬硅钙石）。为了描述其化学和形态特征，我们使用了傅里叶变换红外光谱、场发射扫描电子显微镜和透射电子显微镜图像、BET 吸附-脱附等温线、X 射线衍射图谱、能谱分析、热重分析和振动样品磁强计分析等多种分析方法。该新型纳米催化剂在超声加速条件下，应用于取代咪唑衍生物的一锅法三组分缩合反应中。与其他用于合成咪唑衍生物的传统催化剂相比，该非均相磁性纳米催化剂的绿色合成方法、高的热稳定性、环保性、显著的效率和易于重复使用等优点使其具有优越性。
