Metal-organic frameworks with different oxidation states of metal nodes and aminoterephthalic acid ligand for degradation of Rhodamine B under solar light

Metal-organic frameworks (MOFs) have been investigated recently as effective visible light photocatalysts. In this report, we synthesized nickel, iron, and titanium-based MOFs with different oxidation states of metal ions and aminoterephthalic acid ligand for photocatalytic degradation of Rhodamine...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2022-01, Vol.286, p.131726-131726, Article 131726
Main Authors: Pattappan, Dhanaprabhu, Vargheese, Stella, Kavya, K.V., Kumar, R.T. Rajendra, Haldorai, Yuvaraj
Format: Article
Language:English
Subjects:
Metal-organic framework
Photocatalyst
Rhodamine B
Visible light
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Summary:Metal-organic frameworks (MOFs) have been investigated recently as effective visible light photocatalysts. In this report, we synthesized nickel, iron, and titanium-based MOFs with different oxidation states of metal ions and aminoterephthalic acid ligand for photocatalytic degradation of Rhodamine B (RhB) dye under solar light irradiation. The photoluminescence analysis revealed that the Fe-MOF could suppress the recombination of photoinduced charges and effectively degrade the dye. The photocatalytic experiment demonstrated that the Fe-MOF exhibited higher degradation efficiency of dye (90 %) compared to the Ni-MOF (9 %) and Ti-MOF (50 %) at pH 7 in 90 min. In addition, the effects of catalyst amount, dye concentration, and solution pH on dye degradation were investigated. The photodegradation of dye using Fe-MOF was well-fitted to the first-order kinetics with an R2 value of 0.9987. Furthermore, reactive oxygen species test and electron paramagnetic resonance study revealed that the superoxide anion radicals were mainly responsible for the dye degradation. Cyclic test analysis indicates that there was no substantial decrease in the degradation efficiency of dye after four consecutive cycles. •Fabrication of visible light-driven MOF photocatalysts.•The Fe-MOF showed higher RhB degradation compared to NI-MOF and Ti-MOF.•The Fe-MOF photodegraded 90 % of RhB dye at pH 7 in 90 min.•The photocatalyst showed good stability after four repeated cycles.•Superoxide anion radicals were mainly responsible for the dye degradation.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2021.131726