Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 405, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124668
Keywords
Polypyrrole; Prussian blue; Z-scheme; Photocatalysis; Photo-Fenton reaction
Categories
Funding
- National Natural Science Foundation of China [21674028, 21875086]
- University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province [UNPYSCT-2016075]
- Excellent Youth Science Foundation of Heilongjiang University [JC201703]
- Heilongjiang Postdoctoral Funds for Scientific Research Initiation [LBH-Q19169]
- Open Project of State Key Laboratory of Supramolecular Structure and Materials [Sklssm 202033]
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The conversion of Fe2O3@PPy to Z-scheme Fe2O3@PPy/PB can significantly enhance the degradation rate in photo-Fenton reaction due to higher visible-light harvest, enhanced separation efficiency of photoinduced charges, and lower interface resistance.
Photo-Fenton reaction is a more effective technique for pollutant disposal than photocatalytic reaction. Herein, Fe2O3@polypyrmle/Prussian blue (Fe2O3@PPy/PB) with a hierarchical porous structure was prepared by a reactive-template method. After transforming typical type-II Fe2O3@PPy to Z-scheme Fe2O3@PPy/PB via PB as a bridge, the degradation rate was increased by 1.4 times in photocatalytic reaction and 4.0 times in photo-Fenton reaction due to higher visible-light harvest, enhanced separation efficiency of photoinduced charges, lower interface resistance, and especially well-preserved redox potentials of holes and electrons. Mechanism studies revealed that holes were quenched by H2O2, and this led to O-center dot(2)- generation and efficient separation of electrons. Meanwhile, O-2 was reduced by separated electrons, and this further increased . O-center dot(2)- yield. Therefore, the main radicals changed from hole in photocatalytic reaction to (center dot)O(2)(- )in the photo-Fenton reaction, leading to an increase as high as 12.1-fold enhancement in the degradation rate. Conversely, only H2O2 participated into photocatalytic reaction using Fe2O3@PPy while O-2 was absent, resulting in merely 4.2-fold improvement. This manuscript gives a comprehensive understanding on mechanisms of type-II and Z-scheme heterojunctions in both photocatalytic and photo-Fenton reactions. Obviously, the outcomes are beneficial for designing catalysts with high photo-Fenton activity.
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