The Fe-Pd bifunctional heterogeneous electro-Fenton catalyst is an attractive option for the degradation of phenol wastewater. However, the catalyst faces issues such as inadequate yield of H₂O₂ on the Pd species and poor durability. In this study, we developed a bifunctional Fe-Pd catalyst with Zn embedded into a mesh-type γ-Al₂O₃/Al support (Zn_xFePd/γ-Al₂O₃/Al). The characterization results indicate that the addition of Zn can improve the dispersion of the Pd component on the catalyst surface and promote the crystallization of Fe₃O₄. Density functional theory calculations reveal that Zn doping reduces the activation energy of the rate-controlled step and promotes the desorption of products and intermediates in H₂O₂ synthesis. The reaction kinetics model was proposed. Furtherly, a possible reaction mechanism was proposed to explain the phenol degradation pathways. The selected Zn_1.4FePd/γ-Al₂O₃/Al catalyst achieved a degradation rate of 98.8% for phenol. The degradation rate remained above 85% after seven cycles.

中文翻译：

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用于非均相电芬顿体系的Zn掺杂Fe-Pd双功能网状催化剂的研制


Fe-Pd双功能非均相电芬顿催化剂是苯酚废水降解的一个有吸引力的选择。然而，该催化剂存在Pd物种上H ₂ O ₂产率不足、耐久性差等问题。在这项研究中，我们开发了一种双功能Fe-Pd催化剂，其中Zn嵌入到网状γ-Al ₂ O ₃ /Al载体中（Zn _x FePd/γ-Al ₂ O ₃ /Al）。表征结果表明，Zn的添加可以改善Pd组分在催化剂表面的分散性，促进Fe ₃ O ₄的结晶。密度泛函理论计算表明，Zn掺杂降低了速率控制步骤的活化能，促进了H ₂ O ₂合成中产物和中间体的解吸。提出了反应动力学模型。此外，提出了一种可能的反应机制来解释苯酚的降解途径。所选的Zn _1.4 FePd/γ-Al ₂ O ₃ /Al催化剂对苯酚的降解率为98.8%。七次循环后​​降解率仍保持在85%以上。