Abstract

Herein, M²⁺ substituted CoCuFe₂O₄ (M²⁺ = Mn, Zn, Ni) ferrites have been synthesized using the sol-gel auto combustion method. The structural, morphological and magnetic studies confirm the phase formation of pure magnetic cubic spinel MCoCuFe₂O₄ (M²⁺ = Mn, Zn, Ni) ferrites. The substitution with Mn, Ni and Zn does not show large variation in binding energies obtained from XPS of Cu (2p) that specifies identical copper concentration (Cu_0.5) and substitution of only cobalt (Co²⁺) in Mn-F, Ni-F and Zn-F catalysts. Interestingly, MCoCuFe₂O₄ magnetic catalysts were explored for selective oxidation of a series of substituted benzyl alcohols. Catalyst Mn-F showed 93% conversion of benzyl alcohol while, Ni-F showed 95% conversion of 4-nitrobenzyl alcohol. Whereas, the catalyst Zn-F was showed 96% conversion for 4-methoxybenzyl alcohol. Additionally the results also indicate an efficient separation and recovery of the magnetic catalysts after four successive reuses without any considerable loss in its catalytic activity.

摘要

在此，使用溶胶-凝胶自燃法合成了M ²⁺取代的CoCuFe ₂ O ₄ (M ^{2+ = Mn, Zn, Ni) 铁氧体。}结构、形态和磁性研究证实了纯磁性立方尖晶石 MCoCuFe ₂ O ₄ (M ²⁺ = Mn, Zn, Ni) 铁氧体的相形成。用 Mn、Ni 和 Zn 替代并没有显示从 Cu (2p) 的 XPS 获得的结合能有很大变化，这表明相同的铜浓度 (Cu 0.5 ) 和仅_替代Mn -F、Ni- 中的钴 (Co ²⁺ ) F和Zn-F催化剂。有趣的是，MCoCuFe ₂ O ₄探索了磁性催化剂用于一系列取代苯甲醇的选择性氧化。催化剂Mn-F表现出93％的苯甲醇转化率，而Ni-F表现出95％的4-硝基苯甲醇转化率。而催化剂 Zn-F 对 4-甲氧基苄醇显示出 96% 的转化率。此外，结果还表明磁性催化剂在连续四次重复使用后有效分离和回收，其催化活性没有任何显着损失。