Fattahi Mehdi, Niazi Zohreh, Esmaeili Fatemeh, Mohammadi Ali Akbar, Shams Mahmoud, Nguyen Le Binh
Institute of Research and Development, Duy Tan University, Da Nang, Vietnam.
School of Engineering & Technology, Duy Tan University, Da Nang, Vietnam.
Sci Rep. 2023 Sep 4;13(1):14502. doi: 10.1038/s41598-023-41451-4.
Photocatalytic degradation under ultra-low powered light is a viable advanced oxidation process technique against extensive emerging contaminants. As a new and remarkable class of nanoporous materials, metal-organic frameworks (MOFs), attract interest for the supreme adsorptive and photocatalytic functionalities. An outstanding MOF, MIL-101(Fe) chosen as a photocatalyst template for the synthesis of α-FeO by a simple thermal modification to improve the structural properties toward methylene blue (MB) eradication. Octahedron-like α-FeO photocatalyst (Modified MIL-101(Fe), M-MIL-101(Fe)) was superior in dispersion and separation properties in aqueous medium. Moreover, the adsorptive and catalytic performance was increased for modified form by ~ 7.3% and ~ 17.1% compared to pristine MIL-101(Fe), respectively. Synergistic improvement of MB removal achieved by simultaneous adsorption/degradation under 5-W LED irradiation. Parametric study indicated an 18.1% and 44.5% improvement in MB removal was observed by increasing pH from 4 to 10, and M-MIL-101(Fe) dose from 0.2 to 1 g L, respectively. MB removal followed the pseudo-second-order kinetics model and the process efficiency dropped by 38% as MB concentration increased from 5 to 20 mg L. Radical trapping tests revealed the significant role of [Formula: see text] and electron radicals as the major participants in dye degradation. A significant loss in the efficiency of M-MIL-101(Fe) was observed in the reusability tests that is good to study further. In conclusion, a simple thermal post-synthesis modification on MIL-101(Fe) improved its structural, catalytic, and adsorptive properties against MB.
超低功率光催化降解是一种可行的高级氧化工艺技术，可用于去除多种新兴污染物。作为一类新型且卓越的纳米多孔材料，金属有机框架（MOF）因其出色的吸附和光催化功能而备受关注。一种出色的MOF，即MIL-101(Fe)，被选作光催化剂模板，通过简单的热改性合成α-FeO，以改善其对亚甲基蓝（MB）的去除结构性能。八面体状的α-FeO光催化剂（改性MIL-101(Fe)，M-MIL-101(Fe)）在水性介质中的分散和分离性能更优。此外，与原始的MIL-101(Fe)相比，改性形式的吸附和催化性能分别提高了约7.3%和17.1%。在5W LED照射下，通过同时吸附/降解实现了MB去除的协同改善。参数研究表明，将pH从4提高到10以及将M-MIL-101(Fe)剂量从0.2增加到1 g/L时，MB去除率分别提高了18.1%和44.5%。MB去除遵循准二级动力学模型，随着MB浓度从5增加到20 mg/L，处理效率下降了38%。自由基捕获试验表明，[公式：见原文]和电子自由基是染料降解的主要参与者。在可重复使用性测试中，观察到M-MIL-101(Fe)的效率有显著损失，这值得进一步研究。总之，对MIL-101(Fe)进行简单的热后合成改性可改善其对MB的结构、催化和吸附性能。
