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Oxygen vacancy-induced hydroxyl dipole reorientation in hydroxyapatite for enhanced piezocatalytic activity
Nano Energy ( IF 17.6 ) Pub Date : 2022-06-07 , DOI: 10.1016/j.nanoen.2022.107473
Ye Miao, Wenrou Tian, Jun Han, Najun Li, Dongyun Chen, Qingfeng Xu, Jianmei Lu

A new method to boost the piezocatalytic activity of hydroxyapatite (HAP) is proposed that oxygen vacancies were introduced to align the orientation of hydroxyl dipoles in parallel. A series of hydroxyapatites with different contents of oxygen vacancy were synthesized by hydrothermal method and high-temperature calcination. Among them, hydroxyapatite with a moderate oxygen-vacancy concentration (OVHAP-2 h) exhibited an excellent piezocatalytic removal efficiency of 98.43% for bisphenol A (BPA) within 12 min, and its degradation kinetic rate constant was almost 4 times that of pristine HAP. This could be ascribed to the introduction of oxygen vacancies which induce the transformation in the orientation of hydroxyl dipoles from disorderly to parallel. Finally, the possible piezocatalytic mechanism of OVHAP is proposed based on the free radical trapping experiments. This work provides a novel strategy for improving the piezocatalytic performance of HAP, and expands its application in environmental remediation by harvesting mechanical energy.



中文翻译:

氧空位诱导羟基磷灰石中的羟基偶极重取向以增强压电催化活性

提出了一种提高羟基磷灰石(HAP)压电催化活性的新方法,即引入氧空位以平行排列羟基偶极子的取向。采用水热法和高温煅烧法合成了一系列不同氧空位含量的羟基磷灰石。其中,中等氧空位浓度的羟基磷灰石(OVHAP-2 h)在12 min内对双酚A(BPA)表现出98.43%的优异压电催化去除效率,其降解动力学速率常数几乎是原始HAP的4倍。 . 这可归因于氧空位的引入,其导致羟基偶极子的取向从无序转变为平行。最后,基于自由基捕获实验,提出了OVHAP可能的压电催化机制。这项工作为提高 HAP 的压电催化性能提供了一种新策略,并通过收集机械能扩大了其在环境修复中的应用。

更新日期:2022-06-10
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