Oxygen Vacancy Engineering of Bi 4 Ti 3 O 12 Piezocatalyst Driving In Situ H 2 O 2 Evolution for Self-Cycled Fenton-Like Degradation of Pollutants

作者：Xiaojuan Qiu, Aize Hao, Shanshan Hu, Yali Cao, Jing Xie, Jindou Hu, Zhenjiang Lu · 发表于：Inorganic Chemistry · 年份：2025 · DOI：10.1021/acs.inorgchem.4c05548 · 被引用次数：15 · 研究领域：Advanced Photocatalysis Techniques、Advanced oxidation water treatment、Catalytic Processes in Materials Science

In this work, we synthesized a Bi 4 Ti 3 O 12 piezocatalyst with surface oxygen vacancy (BTO-Ov) to facilitate in situ hydrogen peroxide (H 2 O 2 ) production and to establish a piezocatalytic self-cycled Fenton-like system for degradation of pollutants. Notably, the H 2 O 2 evolution rate from the BTO-Ov catalyst reaches 558.8 μmol g –1 h –1 when utilizing pure water, significantly exceeding the rate obtained from pure BTO (274.6 μmol g –1 h –1 ). Furthermore, this rate can be enhanced to 1091.6 μmol g –1 h –1 with the addition of ethanol as a sacrificial agent and endows robust stability. In the piezocatalytic self-cycled Fenton-like system (BTO-Ov/Fe 0 ), degradation efficiency of the methyl orange (MO) dye pollutant can achieve 91.9% within 20 min, coupled with a high kinetic coefficient of 0.117 min –1, indicating excellent catalytic activity. Relevant characterization results reveal that the introduction of oxygen vacancy improves piezoelectricity, reduces the band gap of BTO, enhances charge carrier transfer and separation, and facilitates a dual-channel reaction mechanism, thereby achieving superior piezocatalytic performance. This work not only facilitates the in situ synthesis of valuable chemicals but also offers a cost-effective and sustainable approach for wastewater purification.