可见光激发Bi2MoO6活化PMS降解盐酸四环素

为了利用半导体光催化和硫酸根自由基高级氧化技术协同作用处理抗生素废水,采用溶剂热法制备三维结构的钼酸铋(Bi₂MoO₆)微球,并在可见光照射下激发Bi₂MoO₆进而活化过一硫酸氢盐(PMS)处理含盐酸四环素(TC)废水。利用扫描电子显微镜(SEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)、紫外-可见漫反射光谱(UV-Vis DRS)等对样品形貌特征、晶格结构、光学性能进行表征。结果表明,Bi₂MoO₆纳米片组成的三维微球具有良好的吸附和可见光催化降解TC能力,活化PMS协同作用可以进一步提高系统降解TC的效率。通过静态实验,考察催化剂使用量、PMS初始浓度、环境共存阴离子(Cl^-、CO^2-₃、NO^-₃)和腐殖酸(HA)对可见光激发Bi₂MoO₆活化PMS降解TC性能的影响。自由基捕获实验表明,·OH、SO^-₄·、O^-₂·和h⁺等活性基团在可见光激发Bi₂MoO₆活化PMS催化降解TC过程中都做出了贡献。

Degradation of Tetracycline Hydrochloride by Bi2MoO6 Activated PMSunder Visible Light Irradiation

For treatment of antibiotic wastewater, the combined effect of semiconductor photocatalysis and sulfate radical (SO^-₄·)-based advanced oxidation processes is considered as a potential solution. Herein, 3D bismuth molybdate (Bi₂MoO₆) microspheres were prepared via a facile solvothermal method and applied to activate peroxymonosulfate (PMS) for tetracycline hydrochloride (TC) elimination under visible light irradiation. The morphology, crystal lattice structure, optical performance, and other properties of the Bi₂MoO₆ sample were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS). The result show that the 3D Bi₂MoO₆ microspheres with a size of ~1.5 mm are composed of Bi₂MoO₆ nanosheets with a thickness of ~20 nm. Bi₂MoO₆ microspheres exhibite high adsorption capacity and significantly photocatalytic performance for the degradation of TC under visible light illumination. Meanwhile, the addition of PMS enhances the ability of Bi₂MoO₆ microspheres for the degradation of TC under visible light illumination. The effects of catalyst dosage, PMS concentration, co-existing ions, such as chloride (Cl^-), carbonate (CO^2-₃) and nitrate (NO^-₃), and humic acids (HA) on the degradation of TC by Bi₂MoO₆ activated PMS under visible light irradiation were investigated through static experiments. Radical trapping tests suggeste that hydroxyl radical (·OH), sulfate radical (SO^-₄·), peroxy radical (O^-₂·), and hole (h⁺) all play a important role in the degradation of TC. Finally, the detailed photocatalytic mechanism was also proposed.