In this study, the novel ternary heterogeneous BiOCl/TiO₂/sepiolite composite with enhanced visible-light-induced photocatalytic activity was synthesized via the hydrolysis precipitation method followed by a calcination crystallization process. The as-prepared samples were characterized by X-ray diffraction (XRD), UV–VIS diffused reflectance spectroscopy (DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N₂ adsorption-desorption, X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL), respectively. Compared with bare BiOCl and TiO₂, the ternary heterogeneous structure in BiOCl/TiO₂/sepiolite significantly improved the visible-light-induced photocatalytic performance towards tetracycline (TC), and also contributed to the separation efficiency and recyclability of the photocatalyst. In addition, the influence of the mass ratio of BiOCl in the composites was also discussed, and the optimal mass ratio is identified as 50% (m_BiOCl/(m_TiO2 + m_BiOCl). Furthermore, TC degradation by-products were further detected by HPLC-MS/MS, and a possible degradation pathway was proposed. Besides, ESR (Electron spin resonance) results indicated that the main active radical species were photo-induced holes (h⁺) and superoxide radical (O₂⁻) in the TC degradation process. Hence, the enhanced photocatalytic activity of the prepared ternary composite was mainly attributed to the remarkable synergistic effect within the BiOCl/TiO₂/sepiolite ternary heterogeneous system, resulting in the superior adsorption activity, the outstanding visible-light response performance and the efficient separation of the photogenerated electron-hole pairs. It is speculated that the novel ternary heterogeneous BiOCl/TiO₂/sepiolite composite would have a broad application prospect in the field of wastewater treatment.

在这项研究中，通过水解沉淀法，然后进行煅烧结晶过程，合成了具有增强的可见光诱导的光催化活性的新型三元异质BiOCl / TiO ₂ /海泡石复合材料。所制备的样品的特征在于X射线衍射（XRD），UV-VIS漫反射光谱（DRS），扫描电子显微镜（SEM），透射电子显微镜（TEM），N ₂吸附-解吸，X射线光电子光谱学（XPS）和光致发光（PL）。与裸BiOCl和TiO ₂相比，BiOCl / TiO _2中的三元异质结构。/海泡石显着改善了可见光诱导的对四环素（TC）的光催化性能，还有助于光催化剂的分离效率和可回收性。此外，还讨论了BiOCl的质量比对复合材料的影响，确定最佳质量比为50％（m _BiOCl /（m _TiO2  + m _BiOCl），并进一步检测到TC降解副产物。通过HPLC-MS / MS，和可能的降解途径提出另外，ESR（电子自旋共振）结果表明，主要的活性自由基物种是光诱导的空穴（h。⁺）和超氧自由基（Ò ₂ ^-）在TC降级过程中。因此，所制备的三元复合材料的光催化活性增强主要归因于BiOCl / TiO ₂ /海泡石三元多相体系内的显着协同作用，从而导致了优异的吸附活性，出色的可见光响应性能和有效的三氯甲烷分离。光生电子-空穴对。推测新型三元异质BiOCl / TiO ₂ /海泡石复合材料在废水处理领域具有广阔的应用前景。