Improving the economic viability of the most successful precious metal catalysts is one of the significant challenges in renewable energy production. We designed a magnetic hybrid material based on Cu-PDA MOF and FeO nanosphere for selective recovery of Au(III) and Pd(II) from e-waste. Owing to its superior maximum adsorption capacities of 1450 and 1236 mg/g for Au (III) and Pd(II), respectively, at 45 °C with the pH of 3 and 1, the sorbed samples were converted into catalysts through an annealing process to obtain carbon supported FeAu and FePd nanoparticles catalysts (FeAu/C and FePd/C). Furthermore, these catalysts were applied for the oxidation of cyclohexane and resulted that FeAu/C catalyst exhibited higher conversion rate of cyclohexane (93.2%) than FePd/C catalyst (88.3%). Mechanistic investigations suggested that synergetic effect of Fe and Au on the supported carbon promoted better bond cleavage of the O–O bond in cyclohexyl hydroperoxide, a crucial intermediate species in the oxidation of cyclohexane. This study provides an alternate approach for the sustainable preparation of highly desired catalytic materials.

中文翻译：

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Fe3O4@MOF 混合物可从电子废物中快速回收 Au(III) 和 Pd(II)，并用作环己烷氧化催化剂

提高最成功的贵金属催化剂的经济可行性是可再生能源生产的重大挑战之一。我们设计了一种基于 Cu-PDA MOF 和 Fe3O 纳米球的磁性混合材料，用于从电子废物中选择性回收 Au(III) 和 Pd(II)。由于其在 45 °C、pH 为 3 和 1 时对 Au (III) 和 Pd(II) 的最大吸附能力分别为 1450 和 1236 mg/g，吸附的样品通过退火过程转化为催化剂获得碳负载的 FeAu 和 FePd 纳米粒子催化剂（FeAu/C 和 FePd/C）。此外，将这些催化剂应用于环己烷的氧化，结果发现FeAu/C催化剂的环己烷转化率(93.2%)高于FePd/C催化剂(88.3%)。机理研究表明，Fe 和 Au 在负载碳上的协同作用促进了环己基过氧化氢（环己烷氧化中的关键中间体）中 O-O 键更好的键断裂。这项研究为可持续制备高度期望的催化材料提供了一种替代方法。