College of Chemical Engineering, North China University of Science and Technology, Tangshan, 063210, China.
College of Chemical Engineering, North China University of Science and Technology, Tangshan, 063210, China.
Chemosphere. 2021 Apr;268:128834. doi: 10.1016/j.chemosphere.2020.128834. Epub 2020 Nov 4.
A magnetic AgPO/rGO/CoFeO ternary catalyst was firstly prepared and used for removing levofloxacin (LVF) from different water matrices via simultaneous adsorption and photocatalysis. Compared with AgPO and AgPO/CoFeO, AgPO/rGO/CoFeO shows a superior adsorption-photocatalysis performance for LVF elimination since rGO component not only improves the adsorption ability but also enhances the charge separation efficiency of the catalyst. About 90.7% of LVF in distilled water (10 mg/L) was removed by the ternary catalyst after adsorption for 0.5 h and photocatalysis for 1.0 h, and the removal of LVF performed well in the pH range of 3.51-9.47. Singlet oxygen (O) was the major reactive oxygen species for LVF degradation in AgPO/rGO/CoFeO system under visible light, as confirmed by the quenching experiments and ESR study. Based on the detected intermediates in the photocatalytic process, the possible LVF degradation pathways were well-established. As-synthesized AgPO/rGO/CoFeO can also efficiently remove LVF from the different real water matrices (river water, lake water and secondary effluent) via simultaneous adsorption and photocatalysis. Moreover, magnetic AgPO/rGO/CoFeO can be easily recovered and effectively reused for the removal of LVF in actual water bodies.
一种磁性 AgPO/rGO/CoFeO 三元催化剂被首次制备，并用于通过吸附和光催化同时去除不同水基质中的左氧氟沙星（LVF）。与 AgPO 和 AgPO/CoFeO 相比，AgPO/rGO/CoFeO 对 LVF 的去除具有更优的吸附-光催化性能，因为 rGO 组分不仅提高了吸附能力，而且增强了催化剂的电荷分离效率。在吸附 0.5 h 和光催化 1.0 h 后，三元催化剂可去除蒸馏水中（10 mg/L）约 90.7%的 LVF，且在 pH 值为 3.51-9.47 的范围内，LVF 的去除效果良好。通过猝灭实验和 ESR 研究证实，在可见光下，AgPO/rGO/CoFeO 体系中 LVF 降解的主要活性氧物种为单线态氧（O）。根据光催化过程中检测到的中间产物，建立了可能的 LVF 降解途径。所合成的 AgPO/rGO/CoFeO 还可以通过吸附和光催化有效地从不同实际水基质（河水、湖水和二级出水）中去除 LVF。此外，磁性 AgPO/rGO/CoFeO 可以很容易地回收，并有效地重复用于实际水体中 LVF 的去除。
