Monolithic Mesh-Type Fe-Pd/γ-Al₂O₃/Al Bifunctional Catalysts for Electro-Fenton Degradation of Rhodamine B  

作　　者：Qianwen Shao Guiru Zhang Linhui Lu Qi Zhang Qianwen Shao;Guiru Zhang;Linhui Lu;Qi Zhang(Department of Chemical Engineering, East China University of Science and Technology, Shanghai, China)

机构地区：[1]Department of Chemical Engineering, East China University of Science and Technology, Shanghai, China

出　　处：《Modern Research in Catalysis》2021年第2期56-72,共17页催化剂现代研究（英文）

摘　　要：A novel Fe-Pd bifunctional catalyst supported on mesh-type γ-Al₂O₃/Al was prepared and applied in the degradation of Rhodamine B (RhB). The monolithic mesh-type Fe-Pd/γ-Al₂O₃/Al bifunctional catalyst could be separated from the solution directly and could synthesize H₂O₂ in situ. The characterization results showed that Fe could improve the dispersion of Pd⁰, and the electronic interactions between Pd and Fe could increase the Pd⁰ contents on the catalyst, which increased the productivity of H₂O₂. Furthermore, DFT calculations proved that the addition of Fe could inhibit the dissociation of O₂ and promote the nondissociative hydrogenation of O₂ on the surface of Fe-Pd/γ-Al₂O₃/Al, which resulted in the increasement of H₂O₂ selectivity. Finally, the in-situ synthesized H₂O₂ by Pd was furtherly decomposed in situ by Fe to generate<span lang="EN-US" style="white-space:normal;font-size:10pt;font-family:;" "=""><span lang="EN-US" style="white-space:normal;font-size:10pt;font-family:;" "=""><span style="white-space:normal;color:#FFFFFF;font-family:Roboto, " background-color:#d46399;"=""><img src="Edit_e6a13073-7151-40b7-b2c3-a59a59d064fc.png" alt="" /></span></span></span>OH radicals to degrade organic pollutants. Therefore, Fe-Pd/ γ-Al₂O₃/Al catalysts exhibited excellent catalytic activity in the in-situ synthesis of H₂O₂ and the degradation of RhB due to the synergistic effects between Pd and Fe on the catalyst. It provided a new idea for the design of bifunctional electro-Fenton catalysts. Ten cycles of experiments showed that the catalytic activity of Fe-Pd/γ-Al₂O₃/Al catalyst could be maintained for a long time.A novel Fe-Pd bifunctional catalyst supported on mesh-type γ-Al₂O₃/Al was prepared and applied in the degradation of Rhodamine B (RhB). The monolithic mesh-type Fe-Pd/γ-Al₂O₃/Al bifunctional catalyst could be separated from the solution directly and could synthesize H₂O₂ in situ. The characterization results showed that Fe could improve the dispersion of Pd⁰, and the electronic interactions between Pd and Fe could increase the Pd⁰ contents on the catalyst, which increased the productivity of H₂O₂. Furthermore, DFT calculations proved that the addition of Fe could inhibit the dissociation of O₂ and promote the nondissociative hydrogenation of O₂ on the surface of Fe-Pd/γ-Al₂O₃/Al, which resulted in the increasement of H₂O₂ selectivity. Finally, the in-situ synthesized H₂O₂ by Pd was furtherly decomposed in situ by Fe to generate<span lang="EN-US" style="white-space:normal;font-size:10pt;font-family:;" "=""><span lang="EN-US" style="white-space:normal;font-size:10pt;font-family:;" "=""><span style="white-space:normal;color:#FFFFFF;font-family:Roboto, " background-color:#d46399;"=""><img src="Edit_e6a13073-7151-40b7-b2c3-a59a59d064fc.png" alt="" /></span></span></span>OH radicals to degrade organic pollutants. Therefore, Fe-Pd/ γ-Al₂O₃/Al catalysts exhibited excellent catalytic activity in the in-situ synthesis of H₂O₂ and the degradation of RhB due to the synergistic effects between Pd and Fe on the catalyst. It provided a new idea for the design of bifunctional electro-Fenton catalysts. Ten cycles of experiments showed that the catalytic activity of Fe-Pd/γ-Al₂O₃/Al catalyst could be maintained for a long time.

关 键 词：Rhodamine B Fe-Pd/γ-Al2O3/Al Catalyst ELECTRO-FENTON Hydrogen Peroxide Synergistic Effects 

分 类 号：O64[理学—物理化学]