Developing low-cost catalysts for the reduction of nitrobenzene compounds is crucial for advancing industrial applications and environmental remediation processes. We report the synthesis of metallic bismuth supported on magnetite nanoparticles. The material was evaluated as a catalyst for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) using NaBH₄ as the reducing agent, demonstrating high catalytic activity by converting 4-NP into 4-AP within just 1.0 min. The catalyst exhibited a first-order kinetic constant 72 times higher than the magnetite control. The effects of reaction temperature and reactant concentration were investigated. After the reaction, the catalyst was easily removed from the reaction system using a magnet and was efficiently reused for four additional cycles. Mag-Bi was efficient as a catalyst for the reduction reaction of other nitrobenzene compounds, including 4-nitrotoluene, 1-chloro-4-nitrobenzene, and 2,4-dinitrophenol. Overall, these results suggest that Mag-Bi is a promising catalyst for nitroarene reduction, exhibiting excellent catalytic performance and good recyclability.

中文翻译：

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一种基于磁铁矿包覆半金属铋的高效多功能硝基苯化合物还原催化剂


开发用于还原硝基苯化合物的低成本催化剂对于推进工业应用和环境修复工艺至关重要。我们报道了磁铁矿纳米颗粒上负载的金属铋的合成。使用 NaBH₄ 作为还原剂，该材料作为将 4-硝基苯酚 （4-NP） 还原为 4-氨基苯酚 （4-AP） 的催化剂进行了评价，通过在短短 1.0 分钟内将 4-NP 转化为 4-AP 表现出高催化活性。催化剂表现出比磁铁矿对照高 72 倍的一阶动力学常数。研究了反应温度和反应物浓度的影响。反应后，使用磁铁很容易从反应系统中取出催化剂，并有效地再利用四个循环。Mag-Bi 可高效用作其他硝基苯化合物（包括 4-硝基甲苯、1-氯-4-硝基苯和 2,4-二硝基苯酚）还原反应的催化剂。总体而言，这些结果表明 Mag-Bi 是一种很有前途的硝基芳烃还原催化剂，表现出优异的催化性能和良好的可回收性。