Author(s)

Qianwen Shao, Guiru Zhang, Linhui Lu, Qi Zhang^*

Department of Chemical Engineering, East China University of Science and Technology, Shanghai, China.

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 generateOH 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.

Rhodamine B, Fe-Pd/γ-Al2O3/Al Catalyst, Electro-Fenton, Hydrogen Peroxide, Synergistic Effects

Shao, Q. , Zhang, G. , Lu, L. and Zhang, Q. (2021) Monolithic Mesh-Type Fe-Pd/γ-Al₂O₃/Al Bifunctional Catalysts for Electro-Fenton Degradation of Rhodamine B. Modern Research in Catalysis, 10, 56-72. doi: 10.4236/mrc.2021.102004.