Institute of Environmental Processes and Pollution Control, and School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China; Jiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, and Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi 214122, China.
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
J Hazard Mater. 2024 Jan 15;462:132799. doi: 10.1016/j.jhazmat.2023.132799. Epub 2023 Oct 17.
Water eutrophication has led to increasingly serious algal blooms (HABs) that pose significant threats to aquatic environmental and human health. Differently sized copper metal organic frameworks (Cu-MOFs), including Cu-MOF-1 (30 nm), Cu-MOF-2, (40 nm), Cu-MOF-3 (50 nm), and Cu-MOF-4 (1 µm×100 nm), were synthesized. Their performance in inactivating Microcystis aeruginosa and degrading microcystin was assessed at the concentration of 0-60 mg/L under visible light irradiation for 6 h. The photocatalytic antialgal activity of Cu-MOF-4 was 10.5%, 14.2%, and 31.2% higher than that of Cu-MOF-3, Cu-MOF-2, and Cu-MOF-1; the efficacy in photocatalytic degradation of microcystin induced by Cu-MOFs also exhibited significant size-dependent efficiency, where Cu-MOF-4 was 2.6-, 1.8-, and 2.0-fold of Cu-MOF-3, Cu-MOF-2, and Cu-MOF-1, respectively. Cu-MOF-4 had greater performance than other Cu-MOFs could attributed to: 1) Cu-MOF-4 is easier to interact with algal cells due to its lower surface negative charge and higher hydrophobicity, resulting in more photocatalyst-algae heteroaggregates formation; 2) Cu-MOF-4 had greater electron-hole pairs separation ability, thus exhibiting higher reactive oxygen species (ROS) production; 3) Cu-MOF-4 had greater hydrostability than other Cu-MOFs, leading to more sustained ROS generation. Additionally, the reusability of Cu-MOF-4 was also greater than other Cu-MOFs.
水体富营养化导致藻类水华（HABs）日益严重，对水生环境和人类健康构成重大威胁。合成了不同粒径的铜金属有机骨架（Cu-MOFs），包括 Cu-MOF-1（30nm）、Cu-MOF-2（40nm）、Cu-MOF-3（50nm）和 Cu-MOF-4（1μm×100nm）。在可见光照射下，浓度为 0-60mg/L，6h 内评估了它们对铜绿微囊藻的灭活和微囊藻毒素降解的性能。在可见光照射下，Cu-MOF-4 的光催化抗藻活性分别比 Cu-MOF-3、Cu-MOF-2 和 Cu-MOF-1 高 10.5%、14.2%和 31.2%；Cu-MOFs 光催化降解微囊藻毒素的效果也表现出显著的尺寸依赖性效率，其中 Cu-MOF-4 分别是 Cu-MOF-3、Cu-MOF-2 和 Cu-MOF-1 的 2.6 倍、1.8 倍和 2.0 倍。Cu-MOF-4 的性能优于其他 Cu-MOFs，原因如下：1）由于表面负电荷较低和疏水性较高，Cu-MOF-4 更容易与藻类细胞相互作用，导致更多的光催化剂-藻类异质聚集体形成；2）Cu-MOF-4 具有更大的电子-空穴对分离能力，因此具有更高的活性氧（ROS）生成能力；3）Cu-MOF-4 的水稳定性大于其他 Cu-MOFs，导致持续产生更多的 ROS。此外，Cu-MOF-4 的可重复使用性也大于其他 Cu-MOFs。
