چكيده به لاتين
Nanocatalysts are groups of catalysts that have been proposed by chemists for increasing efficiency. Nanocatalysts have high stability and selectivity and relatively good activity. These properties are achieved by optimizing the size, shape, electronic structures, chemical and thermal stability of the nanomaterials. In order to optimize physical and chemical properties and to use them purposefully to facilitate chemical reactions or to produce new products in various research fields, the surface of these nanoparticles is usually functionalized with different chemical groups. These particles, whose size is nanoscale and whose surface area is functionalized, are called core / shell nanoparticles. For designing of the structure of this type of nanocatalysts, cores with magnetic properties are usually utilized. As a result, after applying the effect to facilitate the reactions and completion of the reaction process, they can be easily separated from the reaction mixture by using a magnet. For example, nanocatalysts with iron oxide core that have a magnetic property due to the presence of the iron element. Silane shells can be placed on the core, and on top of that, a group of functional group can be placed which depend on the type of application intended for the nanocatalyst
This study is regarding the synthesis and characterization of a novel magnetic nanocomposite 2,4,6-trihydrazino-1,3,5-triazine-functionalized with silica-coated iron oxide nanoparticles (NPs) with porous morphology decorated with the spherical (NPs). Through co-precipitation of iron salts, magnetic (NPs) were obtained. In this regard, as-prepared 2,4,6-trihydrazino-1,3,5-triazine (THDT) was placed on the chlorine surface-modified iron oxide (NPs). This catalyst intensely accelerates the synthesis of highly functionalized tetrahydrobenzo[b]pyran. Employing this catalyst sequels excessive yield within the appreciable reduction of the reaction time. An outstanding matter is that the utilization of this catalyst equals environmental harmlessness. In order to confirm the structure of this catalyst, several analyzes such as FT-IR, EDX, TGA, VSM, SEM and XRD were applied. One of the most important advantages of this catalyst is its recyclability, which after 6 times in the model reaction still has high catalytic properties. The structure of the recycled catalyst was confirmed by FT-IR, EDX and VSM. In addition, this catalyst has high magnetic properties. The amount of magnetic saturation of the synthesized catalyst in the VSM curves was 23 emu g−1, which confirms the magnetic properties. The high magnetic properties of the catalyst make the separation process easily possible by using an external magnet.
