NH2-MIL-125(Ti)/TiO2 heterojunction with non-disturbed dual reactive centers for synchronous photocatalytic removal of Cr(VI) and organic dyes

被引：1

作者：

Yan, Ruifang ^{[1
,2
]}

Zhi, Songsong ^{[1
]}

Hao, Mingming ^{[1
]}

Liu, Yanlei ^{[3
]}

Wang, Hongju ^{[1
]}

Zhou, Shilei ^{[1
]}

Jiang, Kai ^{[1
]}

Wu, Dapeng ^{[1
]}

机构：

[1] School of Environment, Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Normal University, Henan, Xinxiang

[2] School of Basic Medical Science, Xinxiang Medical University, Henan, Xinxiang

[3] College of Physics, Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, Henan Normal University, Henan, Xinxiang

来源：

Chemosphere | 2025年 / 370卷

基金：

中国国家自然科学基金;

关键词：

Cr(VI)/Organic dyes mixed pollutants; Dual reactive centers; Non-disturbed; Synchronous photocatalysis; Z-scheme heterojunction;

D O I：

10.1016/j.chemosphere.2024.143935

中图分类号：

学科分类号：

摘要：

Chromium (VI) (Cr(VI)) generally coexists with organic dyes in industrial effluents, posing a formidable challenge in water purification. Herein, NH2-MIL-125(Ti)/TiO2 Z-scheme heterojunction with intimate interfacial contact was synthesized for synchronous removal of pollutant in coexisting Cr(VI)/dyes system under simulated solar irradiation. Structural and optical investigations indicated that a well-defined interface was formed by establishing a Ti–N–C bond, facilitating the spatial separation of the photoexcited carriers of the Z-scheme heterojunction. The optimum NH2-MIL-125(Ti)/TiO2 nanocomposites show superior performance in photocatalytic removal of the pollutants in the Cr(VI) (5 mg/L, 97.2%)/MB (40 mg/L, 100%) coexistence systems within 120 min, which is comparable to that in the single system. The electron spin resonance (ESR) tests, radicals scavenging experiments, and density functional theory (DFT) cannulations unveiled that TiO2 could serve as oxidation centers to generate hydroxyl radicals (•OH) for MB oxidation, while the NH2-MIL-125(Ti) with exposed Ti nodes could act as reduction centers to effectively adsorb Cr2O72− and inject photo-generated electrons (e−) to accomplish the in-site photoreduction of Cr(VI) into Cr(III) under illumination. Particularly, owing to the spatial separation and non-disturbed dual reactive centers, the reduction and oxidation processes could be well accommodated, which could allow MB and Cr(VI) to be removed synchronously. This work demonstrated the great potential of applying duel reactive centers to eliminate multipollutant simultaneously in the actual scenarios for wastewater treatment. © 2024 Elsevier Ltd

引用

共 65 条

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