Centre for Research on Environmental Ecology and Fish Nutrient of the Ministry of Agriculture, Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China.
Centre for Research on Environmental Ecology and Fish Nutrient of the Ministry of Agriculture, Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China.
Water Res. 2020 Oct 15;185:116220. doi: 10.1016/j.watres.2020.116220. Epub 2020 Jul 22.
To improve the efficiency of antibiotic degradation, the photosynergistic performance of bismuth vanadate (BiVO) with a microalga, Dictyosphaerium sp., was demonstrated under visible-light irradiation for the first time. Sulfamethazine (SM2) was selected as a representative sulfanilamide antibiotic, and the photocatalytic degradation mechanism of SM2 was evaluated in media via the BiVO-algae system. The hydrothermally synthesized sample was characterized using X-ray powder diffraction, X-ray photoelectron spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy, transmission electron microscopy, Brunauer-Emmett-Teller surface area, and Fourier transform infrared spectroscopy techniques. The results demonstrated that the prepared photocatalyst corresponded to phase-pure monoclinic scheelite BiVO. The synthesized BiVO showed superior photocatalytic properties under irradiation with visible light, and more than 80% of photocatalytic degradation efficiency was obtained by the BiVO-algae system. Based on quenching experiments, the photocatalytic degradation of SM2 in the BiVO-algae system was primarily accomplished via the generation of triplet state dissolved organic matter, and hydroxyl radicals played a small role in the degradation process. The direct oxidation of holes made no contribution to the degradation. Metabolomics data showed that a total of 91 metabolites were significantly changed between the two comparison groups (algae-SM2 group vs algae group; algae-BiVO-SM2 group vs algae-BiVO group). The glycometabolism pathways were increased and the tricarboxylic acid cycle was activated when BiVO was present. The study provides a distinctive approach to remove antibiotics using visible light in the aqueous environment.
为了提高抗生素降解效率，首次在可见光照射下展示了五氧化二铋（BiVO）与微藻 Dictyosphaerium sp. 的光协同性能。选择磺胺甲恶唑（SM2）作为代表性磺胺类抗生素，通过 BiVO-藻类系统在介质中评估了 SM2 的光催化降解机制。使用 X 射线粉末衍射、X 射线光电子能谱、紫外-可见漫反射光谱、透射电子显微镜、Brunauer-Emmett-Teller 比表面积和傅里叶变换红外光谱技术对水热合成的样品进行了表征。结果表明，所制备的光催化剂对应于纯相单斜白钨矿 BiVO。合成的 BiVO 在可见光照射下表现出优异的光催化性能，BiVO-藻类系统的光催化降解效率超过 80%。基于猝灭实验，BiVO-藻类系统中 SM2 的光催化降解主要通过生成三重态溶解有机物来完成，而羟基自由基在降解过程中作用较小。空穴的直接氧化对降解没有贡献。代谢组学数据表明，两组比较（藻类-SM2 组与藻类组；藻类-BiVO-SM2 组与藻类-BiVO 组）之间共有 91 种代谢物发生了显著变化。当存在 BiVO 时，糖代谢途径增加，三羧酸循环被激活。该研究提供了一种独特的方法，可在水相环境中使用可见光去除抗生素。
