School of Chemical and Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, PR China.
School of Chemical and Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, PR China.
J Colloid Interface Sci. 2019 Jan 1;533:238-250. doi: 10.1016/j.jcis.2018.08.077. Epub 2018 Aug 23.
In this study, the novel ternary heterogeneous BiOCl/TiO/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), N adsorption-desorption, X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL), respectively. Compared with bare BiOCl and TiO, the ternary heterogeneous structure in BiOCl/TiO/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/(m + m). 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 (O) 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/TiO/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/TiO/sepiolite composite would have a broad application prospect in the field of wastewater treatment.
在这项研究中，通过水解沉淀法和煅烧结晶工艺，合成了具有增强可见光诱导光催化活性的新型三元异质 BiOCl/TiO/海泡石复合材料。通过 X 射线衍射（XRD）、紫外可见漫反射光谱（DRS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、N 吸附-脱附、X 射线光电子能谱（XPS）和光致发光（PL）分别对制备的样品进行了表征。与纯 BiOCl 和 TiO 相比，BiOCl/TiO/海泡石的三元异质结构显著提高了对四环素（TC）的可见光诱导光催化性能，也提高了光催化剂的分离效率和可回收性。此外，还讨论了复合材料中 BiOCl 质量比的影响，确定最佳质量比为 50%（m/(m + m）。此外，通过 HPLC-MS/MS 进一步检测了 TC 降解产物，并提出了可能的降解途径。此外，ESR（电子自旋共振）结果表明，在 TC 降解过程中，主要的活性自由基物种是光诱导空穴（h）和超氧自由基（O）。因此，所制备的三元复合材料光催化活性的增强主要归因于 BiOCl/TiO/海泡石三元异质体系内的协同效应，导致具有优越的吸附活性、出色的可见光响应性能和有效的光生电子-空穴对分离。可以推测，新型三元异质 BiOCl/TiO/海泡石复合材料在废水处理领域具有广阔的应用前景。
