Iron based compounds are good candidates as supports to immobilize different transition metals due to their eco-friendly nature, capability of facilitating chemical modifications, inexpensiveness, high stability and easy recoverability. In this study, palladium nanoparticles (Pd NPs) were successfully stabilized on designed Schiff base modified δ-FeOOH particles as a highly effective and readily recoverable heterogeneous catalyst (Pd-Sch-δ-FeOOH nanocatalyst). The catalyst was fabricated via a facile multi-step approach without utilizing any additional reducing agents. The Pd-Sch-δ-FeOOH was characterized by Fourier transforms infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET). Characterization studies confirmed that the prepared small sized Pd NPs were spherically shaped and well dispersed on the surface of Schiff base modified δ-FeOOH. The catalytic efficiency of Pd-Sch-δ-FeOOH nanocatalyst was then tested in the preparation of benzonitriles through cyanation of aryl halides using K₄[Fe(CN)₆] has been utilized as a cyanation agent and also reduction of p-nitrophenol (p-NP) using NaBH₄ as the reducing agent. Benzonitriles were characterized using GC-MS. Catalytic studies showed that benzonitriles were obtained in good reaction yields in the presence of heterogeneous Pd-Sch-δ-FeOOH nanocatalyst (87–98%). It was found that Pd-Sch-δ-FeOOH was also a useful nanocatalyst for p-NP reduction at ambient temperature in eco-friendly media within 2 min. The reduction rate for p-NP with Pd-Sch-δ-FeOOH was measured via UV–Vis spectroscopy from 250 nm to 550 nm. Furthermore, Pd-Sch-δ-FeOOH nanocatalyst was able to remain active for six successive runs due to its recyclable/reusable nature.

铁基化合物由于其生态友好的性质，促进化学修饰的能力，廉价，高稳定性和易回收性，因此是固定不同过渡金属的良好候选载体。在这项研究中，钯纳米颗粒（Pd NPs）成功地稳定在设计的席夫碱改性δ-FeOOH颗粒上，作为高效且易于回收的多相催化剂（Pd-Sch-δ-FeOOH纳米催化剂）。催化剂是通过一种简便的多步骤方法，无需使用任何其他还原剂。通过傅立叶变换红外光谱（FT-IR），X射线衍射（XRD），扫描电子显微镜（SEM），能量色散X射线光谱（EDS），透射电子显微镜对Pd-Sch-δ-FeOOH进行表征（TEM）和Brunauer-Emmett-Teller（BET）。表征研究证实，所制备的小尺寸Pd NP为球形，并良好地分散在席夫碱改性的δ-FeOOH表面上。然后测试了Pd-Sch-δ-FeOOH纳米催化剂在使用K ₄ [Fe（CN）₆ ]进行芳基卤化物氰化制备苄腈中的催化效率，该催化剂已被用作氰化剂，还还原了对硝基苯酚（p-NP），使用NaBH ₄作为还原剂。使用GC-MS对苯甲腈进行表征。催化研究表明，在非均相Pd-Sch-δ-FeOOH纳米催化剂（87-98％）的存在下，苯甲腈以良好的反应收率获得。已经发现，Pd-Sch-δ-FeOOH还是在环境友好的介质中于2分钟内在环境温度下还原p- NP的有用的纳米催化剂。通过UV-Vis光谱从250 nm至550 nm测量了Pd-Sch-δ-FeOOH对p -NP的还原率。此外，Pd-Sch-δ-FeOOH纳米催化剂由于其可循环/可重复使用的性质，因此能够连续六次保持活性。