Zhou Meiling, Zhao Haidong, Zhang Yaping, He Yufeng, Song Pengfei, Wang Rongmin
Key Lab. Eco-functional Polymer Materials of MOE, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.
ACS Appl Mater Interfaces. 2025 Sep 24;17(38):53600-53614. doi: 10.1021/acsami.5c13873. Epub 2025 Sep 14.
Environmental issues stemming from antibiotic misuse pose a significant threat to ecological security. The development of catalysts capable of activating peroxymonosulfate (PMS) and facilitating the generation of degradation-related free radicals remains a critical challenge. Herein, hydroxyapatite nanowires (HNs) were employed as carriers to synthesize a wood ear-like heterojunction (Co/FeLDHs@HNs) via in situ integration of Co/Fe layered double hydroxides (Co/FeLDHs) on the HNs surface. The Co/FeLDHs@HNs combined with PMS (Co/FeLDHs@HNs/PMS) generates substantial reactive oxygen species (ROS), including singlet oxygen (O), sulfate radicals (SO), hydroxyl radicals (OH), and superoxide radicals (O), which collectively contribute over 90% to the degradation of tetracycline hydrochloride (TCs), achieving a removal rate of 98% within 5 min. This high efficiency is primarily attributed to the continuous generation of ROS as the dominant active species in pollutant degradation, with the heterojunction structure facilitating electron transfer and PMS activation to sustain ROS production throughout the process. Additionally, the unique wood ear-like morphology, characterized by its high aspect ratio and hierarchical porous structure, increases the surface area and exposure of active sites, facilitating mass transfer and accelerating interfacial electron interactions, thereby enhancing catalytic performance. This system also demonstrates excellent reusability, maintaining around 83% efficiency after eight cycles, and displays low biotoxicity with potential for agricultural applications. This work provides valuable insights into designing advanced catalysts for effective environmental remediation.
抗生素滥用引发的环境问题对生态安全构成了重大威胁。开发能够激活过一硫酸盐（PMS）并促进降解相关自由基生成的催化剂仍然是一项严峻挑战。在此，羟基磷灰石纳米线（HNs）被用作载体，通过在HNs表面原位整合Co/Fe层状双氢氧化物（Co/FeLDHs）来合成一种木耳状异质结（Co/FeLDHs@HNs）。Co/FeLDHs@HNs与PMS结合（Co/FeLDHs@HNs/PMS）会产生大量活性氧（ROS），包括单线态氧（O）、硫酸根自由基（SO）、羟基自由基（OH）和超氧自由基（O），这些活性氧共同对盐酸四环素（TCs）的降解贡献超过90%，在5分钟内实现了98%的去除率。这种高效率主要归因于在污染物降解过程中作为主要活性物种持续产生的ROS，异质结结构促进了电子转移和PMS活化，从而在整个过程中维持ROS的产生。此外，独特的木耳状形态，具有高纵横比和分级多孔结构，增加了表面积和活性位点的暴露，促进了传质并加速了界面电子相互作用，从而提高了催化性能。该体系还表现出优异的可重复使用性，在八个循环后仍保持约83%的效率，并且显示出低生物毒性，具有农业应用潜力。这项工作为设计用于有效环境修复的先进催化剂提供了有价值的见解。
