Abstract

In this work bimetallic nanoparticles of iridium with low cost Sn, Cu, and Ni are synthesized. The nanoparticles have been synthesized by modified Polyol reduction method. The conversion of precursor salts into nanoparticles has been confirmed by UV-Vis spectra. XRD and TEM confirms that the particle’s size ranges between 5 and 7 nm and are less disperse, amorphous, and quasi-spherical in nature. XPS reveals SnO_x rich surface in Ir-Sn nanoparticles and Ir rich surface for Ir-Ni and Ir-Cu nanoparticles indicating core-shell structure of bimetals. The catalytic activity of the synthesized nanoparticles, below size 10 nm, has been studied in the remediation of azo dye orange IV by hexacyanoferrate(III) oxidation in aqueous alkaline medium. The results reveal that the catalytic activity of bimetallic Ir- M nanoparticles is better than Ir monometallic nanoparticles due to synergistic effect. Moreover, recovery and reuse of these nanoparticles makes them potential candidates for dye degradation technologies.

摘要

在这项工作中，合成了具有低成本Sn，Cu和Ni的铱双金属纳米颗粒。通过改进的多元醇还原法合成了纳米颗粒。前体盐到纳米颗粒的转化已通过紫外-可见光谱确认。XRD和TEM证实了该颗粒的大小在5到7 nm之间，并且本质上分散性较小，无定形和准球形。XPS揭示了SnO _xIr-Sn纳米颗粒中具有丰富的表面，Ir-Ni和Ir-Cu纳米颗粒中具有丰富的Ir表面，表明双金属的核壳结构。在碱性水溶液中，通过六氰合铁酸盐（III）氧化修复偶氮染料橙IV时，已研究了尺寸小于10 nm的合成纳米颗粒的催化活性。结果表明，由于协同作用，双金属Ir-M纳米粒子的催化活性优于Ir单金属纳米粒子。此外，这些纳米颗粒的回收和再利用使其成为染料降解技术的潜在候选者。