In this study, a novel Ce-doped hydrotalcite (Ce–NiFe-LDHs) was synthesized by co-precipitation, which completely removed tetracycline hydrochloride (TC-HCl) in the photo-Fenton system within 60 min, and showed excellent stability and durability in cycling tests. In addition, the catalyst has demonstrated a wide range of adaptability to environmental conditions in the photo-Fenton system, maintaining efficient catalytic performance regardless of water quality differences, environmental factors or different types of antibiotics. The introduction of rare earth element Ce can not only effectively reduce the band gap width of the catalyst and broaden its absorption capacity in the visible light range, but also promote the efficient migration and separation of photogenerated carriers by optimizing the optical properties, further improving the catalytic efficiency. The free radical quenching experiment and electron spin resonance test revealed the core role of the photogenerated hole as the main active substance. Combined with high performance liquid chromatography-mass spectrometry and density functional theory calculations, the degradation pathways were proposed. Meanwhile, through the Toxicity Estimation Software Tool and germination and growth test of soybean, it was found that the reaction was a process of toxicity reduction. This study provides a new strategy and theoretical basis for the future study of heterogeneous catalytic decomposition of antibiotic residues.

中文翻译：

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一种新型 Ce掺杂水滑石，用于在光芬顿系统中有效去除盐酸四环素：从性质到机制


本研究采用共沉淀法合成了一种新型 Ce掺杂水滑石 （Ce-NiFe-LDHs），可在 60 min 内完全去除光芬顿体系中的盐酸四环素 （TC-HCl），并在循环测试中表现出优异的稳定性和耐久性。此外，该催化剂在光芬顿系统中表现出对环境条件的广泛适应性，无论水质差异、环境因素或不同类型的抗生素如何，都能保持高效的催化性能。稀土元素Ce的引入不仅可以有效减小催化剂的带隙宽度，拓宽其在可见光范围内的吸收能力，还可以通过优化光学性能促进光生载流子的高效迁移和分离，进一步提高催化效率。自由基猝灭实验和电子自旋共振测试揭示了光生空穴作为主要活性物质的核心作用。结合高效液相色谱-质谱和密度泛函理论计算，提出了降解途径。同时，通过毒性估计软件工具和大豆的发芽和生长试验，发现该反应是一个降低毒性的过程。本研究为未来抗生素残留异相催化分解的研究提供了新的策略和理论依据。