Flexoelectricity in hydroxyapatite for the enhanced piezocatalytic degradation of phenanthrene in soil†

Industrial Chemistry & Materials Pub Date : 2023-10-11 DOI:10.1039/D3IM00093A

Jun Han, Wenrou Tian, Ye Miao, Najun Li, Dongyun Chen, Qingfeng Xu, Hua Li and Jianmei Lu

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Abstract

Coupling the effects of flexoelectricity with piezoelectricity has been proved to effectively harvest mechanical energy. In this study, a composition-graded core–shell structure (HAP@FAP) was prepared by surface-gradient F-doping in hydroxyapatite, which could introduce flexoelectricity by a built-in strain gradient. A flexoelectric-boosted piezoelectric response was demonstrated by piezoresponse force microscopy (PFM) characterization, showing that the piezoelectric constant of HAP@FAP was increased by 2.25 times via a lattice strain gradient induced by chemical heterogeneities derived from the unique composition-graded core–shell structure. Thus, the piezocatalytic activity of HAP@FAP for phenanthrene (PHE) degradation in soil was enhanced. This work provides a new strategy for the modification of piezoelectric catalysts for the remediation of organics-contaminated soils on industrial land.

Keywords: Hydroxyapatite; Flexoelectricity; Piezocatalysis; Gradient doping; Soil remediation.

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增强土壤中菲的压电催化降解的羟基磷灰石柔电性

事实证明，将挠电效应与压电效应结合起来，可以有效地获取机械能。本研究通过在羟基磷灰石中进行表面梯度 F 掺杂，制备了一种成分梯度核壳结构（HAP@FAP），通过内置应变梯度引入了挠电效应。通过压电响应力显微镜（PFM）表征，证明了 HAP@FAP 的压电常数通过晶格应变梯度提高了 2.25 倍。因此，HAP@FAP 在土壤中降解菲（PHE）的压电催化活性得到了增强。这项工作为工业用地有机物污染土壤的修复提供了一种新的压电催化剂改性策略：羟基磷灰石柔电性压电催化梯度掺杂土壤修复

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