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In heterogeneous Fenton-like systems, the unsustainable cycle of Fe 3+ /Fe 2+ is the primary limitation on degradation efficiency. We proposed a novel strategy for enhancing catalytic performance of heterogeneous Fenton-like system through piezoelectric effect-driven Fe 3+ reduction. Therefore, the Bi 4 Ti 3 O 12 /α-FeOOH composite was synthesized, and it had exceptional piezoelectric characteristics. A piezoelectric Fenton-like system based on Bi 4 Ti 3 O 12 /α-FeOOH was constructed and achieved near-complete norfloxacin (NOR) removal (≈100 %) within 120 min. The improved electron transfer efficiency was corroborated by EIS and piezoelectric current responses. The contributions of free radicals follow order: OH > h + > 1 O 2 > O 2 − . XPS and DFT calculations revealed an electron transfer pathway from Bi 4 Ti 3 O 12 to α-FeOOH. Under mechanical stress Bi 4 Ti 3 O 12 generated electrons, which reacted with Fe 3+ to sustain the chain reaction of Fe 3+ /Fe 2+ , ultimately promoting the heterogeneous Fenton-like reaction. A total of 12 NOR intermediates were detected, and the degradation pathway of NOR was deduced. The piezoelectric Fenton-like degradation reduces the toxicity of pollutant. Finally, the good degradation stability and practical application potential of Bi 4 Ti 3 O 12 /α-FeOOH piezoelectric Fenton-like system was confirmed. This work presented the feasibility and mechanism of piezoelectric effect promoting heterogeneous Fenton-like reaction, and provided a sustainable solution for refractory organic wastewater purification. • The piezoelectric Fenton-like system based on Bi 4 Ti 3 O 12 /α-FeOOH was constructed. • Piezoelectric electrons generated by Bi 4 Ti 3 O 12 improved the sustainability of Fe 3+ /Fe 2+ cycle. • Bi 4 Ti 3 O 12 /α-FeOOH piezoelectric Fenton-like system showed excellent degradation activity. • The piezoelectric Fenton-like system exhibited good practical application potential.
Guo et al. (Mon,) studied this question.