Abstract

The fabrication of aminotetrazole–palladium(II) complex immobilized on silica-encapsulated Fe₃O₄ magnetic nanoparticles is described with full characterization using XRD, TGA–DTG, EDS, TEM, FESEM, VSM and FTIR spectroscopy. This prepared core–shell entity has been explored as a highly efficient reusable nanocatalyst with superior stability and high catalytic activity in the reduction of hexavalent chromium [Cr(VI)], nitroarenes and azo dyes compared to other reported Pd-based nanocatalysts. The catalytic activity of the catalyst for the reduction of Cr(VI), 2,4-dinitrophenylhydrazine, 4-nitrophenol, methyl orange, Congo red, nigrosin and rhodamine B with sodium borohydride (NaBH₄) aqueous solution or formic acid is evaluated by UV–Vis spectroscopy. The present study illustrates an unprecedented example of arylaminotetrazole grafted on magnetic nanoparticles as an excellent magnetically recoverable catalyst which can be recycled seven times without any meaningful changes in the reaction time.

Graphic abstract

摘要

描述了使用XRD，TGA-DTG，EDS，TEM，FESEM，VSM和FTIR光谱法全面表征了固定在二氧化硅包裹的Fe ₃ O ₄磁性纳米粒子上的氨基四唑-钯（II）配合物的制备。与其他已报道的基于Pd的纳米催化剂相比，这种制备的核-壳实体已被研究为一种高效可重复使用的纳米催化剂，具有出色的稳定性和在还原六价铬[Cr（VI）]，硝基芳烃和偶氮染料方面的高催化活性。硼氢化钠（NaBH ₄）还原Cr（VI），2,4-二硝基苯肼，4-硝基苯酚，甲基橙，刚果红，尼古丁和若丹明B的催化剂催化活性）水溶液或甲酸通过紫外可见光谱法进行评估。本研究说明了在磁性纳米颗粒上接枝的芳基氨基四唑作为一种出色的可磁回收催化剂的空前实例，该催化剂可循环使用七次而反应时间没有任何有意义的变化。

图形摘要