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A facile strategy for fabricating AgI–MIL-53(Fe) composites: superior interfacial contact and enhanced visible light photocatalytic performance

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Abstract

Metal–organic framework (MOF)-based composites have attracted great attention due to their potential applications in sustainable energy and environmental remediation. However, the development of the MOF-based composite as a visible-light photocatalyst for water treatment is still a challenge. Herein, through a simple grinding process, g-AgI/MIL-53(Fe) composites have been successfully fabricated. The resulting g-AgI/MIL-53(Fe) not only explored more active sites but also improved the interfacial contact between AgI and MIL-53(Fe), which is available for the separation and transfer of photogenerated charge carriers. Thus, the g-AgI/MIL-53(Fe) composites exhibited enhanced visible-light photocatalytic performance for Rhodamine B (RhB) degradation compared with the bare MIL-53(Fe) and pristine AgI under the same experimental conditions. After 45 min, RhB was completely mineralized by the g-AgI/MIL-53(Fe)-0.5 composite under visible light irradiation. In addition, acid blue (AB) and Methyl orange (MO) were also degraded by the g-AgI/MIL-53(Fe)-0.5 composite after 45 min irradiation, by 39% and 65%, respectively. Based on the photoelectrochemical analyses, it can be proven that the introduction of AgI could effectively hinder the recombination of photogenerated electron–hole pairs. Subsequently, the possible photocatalytic mechanism of the g-AgI/MIL-53(Fe)-0.5 composite has also been investigated in detail. Furthermore, g-AgI/MIL-53(Fe) composites also showed excellent photocatalytic stability. Under visible light irradiation, the RhB degradation activity was retained at approximately 70% of its original activity after five recycles, which makes it a potential candidate for large-scale applications.

Graphical abstract: A facile strategy for fabricating AgI–MIL-53(Fe) composites: superior interfacial contact and enhanced visible light photocatalytic performance

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Publication details

The article was received on 23 Jan 2018, accepted on 24 Jan 2018 and first published on 12 Feb 2018


Article type: Paper
DOI: 10.1039/C8NJ00417J
Citation: New J. Chem., 2018, Advance Article
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    A facile strategy for fabricating AgI–MIL-53(Fe) composites: superior interfacial contact and enhanced visible light photocatalytic performance

    Y. Han, C. Bai, L. Zhang, J. Wu, H. Meng, J. Xu, Y. Xu, Z. Liang and X. Zhang, New J. Chem., 2018, Advance Article , DOI: 10.1039/C8NJ00417J

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