Composite NH2-MIL-125(Ti) to modulate the microstructure of MnO2 and improve oxidation properties

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology Pub Date : 2024-05-13 DOI:10.1007/s10971-024-06386-w

Wenwen Tan, Yanling Liu, Zao Jiang, Longjun Xu, Qi Feng

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Abstract

In this paper, we employed a hydrothermal method to synthesize different ratios of NH₂-MIL-125(Ti) modified manganese dioxide (MnO₂@ NH₂-MIL-125(Ti)) and explored the effect of pH and mass fraction on the degradation of Rhodamine B. The characterization (XRD, XPS, SEM) of the material proves that MnO₂ successfully adheres and grows on the NH₂-MIL-125(Ti) frameworks, changing the micromorphology while increasing the yield. In particular, when the NH₂-MIL-125(Ti) is introduced at a ratio of 15%, the composite sample reveals optimal degradation performance, with a rate of Rhodamine B degradation as high as 95.8% in 40 min, which is about 1.6 times better than that of pure MnO₂. And it can perform superior oxidation performance under acidic conditions. The increased active sites due to the introduction of the framework structure and the higher redox potential under acidic conditions are the main reasons for the improved oxidative properties. In addition, we put forward a mechanism of growth and oxidative degradation for the composite sample for this phenomenon.

Graphical Abstract

Abstract Image

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复合 NH2-MIL-125(Ti)可调节 MnO2 的微观结构并改善其氧化性能

本文采用水热法合成了不同比例的NH2-MIL-125(Ti)修饰二氧化锰（MnO2@ NH2-MIL-125(Ti)），并探讨了pH值和质量分数对罗丹明B降解的影响。材料的表征（XRD、XPS、SEM）证明，二氧化锰成功地附着并生长在NH2-MIL-125(Ti)框架上，改变了微观形貌，同时提高了产率。特别是当 NH2-MIL-125(Ti) 的引入比例为 15%时，复合样品显示出最佳的降解性能，40 分钟内罗丹明 B 的降解率高达 95.8%，是纯 MnO2 的 1.6 倍。而且在酸性条件下也能发挥出优异的氧化性能。框架结构的引入增加了活性位点，以及酸性条件下更高的氧化还原电位是氧化性能改善的主要原因。此外，我们还针对这一现象提出了复合样品的生长和氧化降解机理。

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来源期刊

Journal of Sol-Gel Science and Technology 工程技术-材料科学：硅酸盐

CiteScore

4.70

自引率

4.00%

发文量

280

审稿时长

2.1 months

期刊介绍： The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.

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