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痕量的羟基自由基（HO）对MIL-125和NH-MIL-125纳米结构光催化降解亚甲基蓝效率有显著影响。

Significant effects of negligible amount of HO on photocatalytic efficiency of MIL-125 and NH-MIL-125 nanostructures in degradation of methylene blue.

作者信息

Mahmoodi Afsaneh, Dorranian Davoud, Abbasi Hamed

机构信息

Plasma Physics Research Center, Science and Research Branch, Islamic Azad University Tehran Iran

Department of Imaging Physics, Faculty of Applied Sciences, Delft University of Technology Delft The Netherlands

出版信息

RSC Adv. 2024 Sep 23;14(41):30140-30153. doi: 10.1039/d4ra05733c. eCollection 2024 Sep 18.

DOI:10.1039/d4ra05733c
PMID:39315026
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11418012/
Abstract

The notable impact of a trace amount of hydrogen peroxide (HO) on the photocatalytic performance of Ti-based metal-organic frameworks (MOFs), namely MIL-125 and NH-MIL-125, in the purification of water polluted with chemical agents was studied experimentally. MIL-125 and NH-MIL-125 were synthesized using the solvothermal method and were characterized by a variety of diagnostic methods. NH-MIL-125 exhibited a bandgap of 2.8 eV compared to 3.65 eV for MIL-125 with optimal visible light capture capability, indicating the outstanding photodegradation activity of the synthesized MOFs. In addition, the photocatalytic performance of MIL-125 and NH-MIL-125 was tested for the degradation of methylene blue (MB) as a chemical pollutant in water under both dark conditions and irradiation by visible light and a UVC lamp. NH-MIL-125 exhibited a significantly higher photodegradation rate compared to MIL-125 due to the presence of the amino group, higher surface electronegativity and slightly lower bandgap. Furthermore, the effect of HO as an electron acceptor on the efficiency of MB degradation was investigated, which markedly enhanced the photocatalytic MB degradation performance due to the ligand-to-metal charge transfer mechanism, particularly for NH-MIL-125, under all tested conditions.

摘要

实验研究了痕量过氧化氢（HO）对钛基金属有机框架材料（MOFs），即MIL-125和NH-MIL-125，在净化受化学试剂污染的水中的光催化性能的显著影响。采用溶剂热法合成了MIL-125和NH-MIL-125，并通过多种诊断方法对其进行了表征。NH-MIL-125的带隙为2.8 eV，而MIL-125的带隙为3.65 eV，具有最佳的可见光捕获能力，这表明合成的MOFs具有出色的光降解活性。此外，测试了MIL-125和NH-MIL-125在黑暗条件下以及可见光和紫外灯照射下对水中化学污染物亚甲基蓝（MB）的光催化降解性能。由于氨基的存在、较高的表面电负性和略低的带隙，NH-MIL-125的光降解速率明显高于MIL-125。此外，研究了HO作为电子受体对MB降解效率的影响，在所有测试条件下，由于配体到金属的电荷转移机制，HO显著提高了光催化MB降解性能，特别是对于NH-MIL-125。

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