Abstract
Bimetallic Fenton catalyst has attracted widespread attention in refractory organics removal. Herein, we firstly investigated the influence of ZrO2 structure features on H2O2 activation in Zr-Fe bimetallic catalyst. The results show that the heterojunction structure will be formed after high temperature calcination, which makes the ability of Zr-Fe bimetallic catalyst to activate H2O2 for bisphenol A degradation is 3.1 times higher than that of α-Fe2O3 without Zr doping. Through characterization and density functional theory, it was identified that compared to (1 1 0) interface, the adsorption energy of H2O2 on iron sites at (1 1 0)-(1 0 0) interface reduced by 1.27 kJ mol−1, while the Fe–O bond length in the stable configuration of Fe-OOH increased by 0.16 Å, which was beneficial to the association and dissociation of H2O2 on iron sites. Besides, the surface -OH of amorphous ZrO2 in Zr-Fe bimetallic catalyst synthesized under low temperature conditions could promote HO2•/O2•- formation through the surface electron transfer, accelerating the Fe(III) reduction. In conclusion, this study reveals the influence of environment-friendly ZrO2 structure features on H2O2 activation, proposes a new insight into strengthening the synergistic effect between bimetals, and provides a reference for the structural optimization of bimetallic catalysts.
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