Molybdenum disulfide (MoS₂)-based materials for piezocatalysis are unsatisfactory due to their low actual piezoelectric coefficient and poor electrical conductivity. Herein, 1T/3R phase MoS₂ grown in situ on multiwalled carbon nanotubes (MWCNTs) was proposed. MoS₂@MWCNTs exhibited the interwoven morphology of thin nanoflowers and tubes, and the piezoelectric response of MoS₂@MWCNTs was 4.07 times higher than that of MoS₂ via piezoresponse force microscopy (PFM) characterization. MoS₂@MWCNTs exhibited superior activity with a 91% degradation rate of norfloxacin (NOR) after actually working 24 min (as for rhodamine B, reached 100% within 18 min) by pulse-mode ultrasonic vibration-triggered piezocatalysis. It was found that piezocatalysis for removing pollutants was attributed to the synergistic effect of free radicals (^•OH and O₂^•–) and nonfree radical (¹O₂, key role) pathways, together with the innergenerated-H₂O₂ promoting the degradation rate. ¹O₂ can be generated by electron transfer and energy transfer pathways. The presence of oxygen vacancies (OVs) induced the transformation of O₂ to ¹O₂ by triplet energy transfer. The fast charge transfer in MoS₂@MWCNTs heterostructure and the coexistence of sulfur vacancies and OVs enhanced charge carrier separation resulting in a prominent piezoelectric effect. This work opens up new avenues for the development of efficient piezocatalysts that can be utilized for environmental purification.

中文翻译：

---

具有丰富空位缺陷的MoS2@MWCNTs通过内生H2O2有效压电催化降解诺氟沙星：增强的非自由基途径和与自由基途径的协同机制


用于压电催化的二硫化钼（MoS ₂ ）基材料由于其实际压电系数低和导电性差而不能令人满意。在此，提出了在多壁碳纳米管（MWCNT）上原位生长的1T/3R相MoS ₂ 。 MoS ₂ @MWCNTs 表现出薄纳米花和管状交织的形貌，且 MoS ₂ @MWCNTs 的压电响应比 MoS ₂ 高 4.07 倍通过压电响应力显微镜 (PFM) 表征。 MoS ₂ @MWCNTs 在脉冲模式超声振动触发下表现出优异的活性，实际工作 24 分钟后诺氟沙星 (NOR) 降解率为 91%（罗丹明 B 在 18 分钟内达到 100%）压电催化。研究发现，压电催化去除污染物的作用是自由基（ ^• ·OH和O ₂ ^•– ）和非自由基（ ¹ O ₂ ，关键作用）途径，与内部生成的-H ₂ O ₂ 一起促进降解速率。 ¹ O ₂ 可以通过电子转移和能量转移途径产生。氧空位 (OV) 的存在导致 O ₂ 通过三线态能量转移转变为 ¹ O ₂ 。 MoS ₂ @MWCNTs 异质结构中的快速电荷转移以及硫空位和 OV 的共存增强了载流子分离，从而产生了显着的压电效应。这项工作为开发可用于环境净化的高效压电催化剂开辟了新途径。