Enhanced dye degradation using MIL-53(Fe)-Modified kraft lignin as a heterogeneous Fenton catalyst

IF 2 3区化学 Q4 CHEMISTRY, PHYSICAL

Chemical Physics Pub Date : 2024-10-14 DOI:10.1016/j.chemphys.2024.112492

Nayana Sut , Priyanga Manjuri Bhuyan , Swapnali Hazarika , Brajendra K. Sharma , Jaemin Kim , Parikshit Gogoi

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Abstract

MIL-53(Fe), a metal–organic framework (MOF), is capable of degrading harmful organic contaminants, but it has relatively low Fenton catalytic efficiency. To enhance the degradation performance of MIL-53(Fe), we synthesized MIL-53(Fe)-MKL by incorporating modified kraft lignin (MKL) into pristine MIL-53(Fe). The as-prepared composite demonstrated Fenton activity, degrading 97 % of methylene blue (MB) within 50 min. Compared to pristine MIL-53(Fe) (which achieved 62.4 % MB degradation), the MIL-53(Fe)-MKL composite showed a 34.6 % improvement in MB degradation under identical reaction conditions. The incorporated MKL promotes Fe²⁺ regeneration from Fe³⁺ in the Fenton process, activating H₂O₂ to produce OH radicals, which were identified through scavenging experiments and chemical dosimetry with ESR analysis. The MIL-53(Fe)-MKL composite was reused for at least five cycles without a significant decrease in catalytic efficiency. This reported catalyst takes advantage of both MKL and MIL-53(Fe) to enhance catalytic activity, providing a basis for developing innovative catalysts for organic pollutant degradation.

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使用 MIL-53(Fe)改性牛皮纸木质素作为异相芬顿催化剂增强染料降解能力

金属有机框架（MOF）MIL-53(Fe)能够降解有害有机污染物，但其芬顿催化效率相对较低。为了提高 MIL-53(Fe) 的降解性能，我们在原始 MIL-53(Fe) 中加入了改性牛皮纸木质素 (MKL)，从而合成了 MIL-53(Fe)- MKL。制备的复合材料具有芬顿活性，能在 50 分钟内降解 97% 的亚甲基蓝（MB）。与原始 MIL-53(Fe)（MB 降解率为 62.4%）相比，在相同的反应条件下，MIL-53(Fe)-MKL 复合材料的 MB 降解率提高了 34.6%。加入的 MKL 促进了 Fenton 过程中 Fe3+ 的 Fe2+ 再生，激活了 H2O2 以产生 OH 自由基，这些自由基是通过清除实验和带有 ESR 分析的化学剂量测定确定的。MIL-53(Fe)-MKL 复合材料可重复使用至少五个周期，而催化效率不会显著降低。所报道的催化剂同时利用了 MKL 和 MIL-53(Fe)的优势来提高催化活性，为开发创新型有机污染物降解催化剂奠定了基础。

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来源期刊

Chemical Physics 化学-物理：原子、分子和化学物理

CiteScore

4.60

自引率

4.30%

发文量

278

审稿时长

39 days

期刊介绍： Chemical Physics publishes experimental and theoretical papers on all aspects of chemical physics. In this journal, experiments are related to theory, and in turn theoretical papers are related to present or future experiments. Subjects covered include: spectroscopy and molecular structure, interacting systems, relaxation phenomena, biological systems, materials, fundamental problems in molecular reactivity, molecular quantum theory and statistical mechanics. Computational chemistry studies of routine character are not appropriate for this journal.