Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2025 Jan 24;15(4):2462-2469.
doi: 10.1039/d4ra08143a. eCollection 2025 Jan 23.

Cu/Cu2O/NH2-MIL-88B (Fe) heterojunction as the photocatalyst to remove hexavalent chromium heavy metal ions in water

Chunhua Xu  1
Affiliations

Cu/Cu2O/NH2-MIL-88B (Fe) heterojunction as the photocatalyst to remove hexavalent chromium heavy metal ions in water

Chunhua Xu. RSC Adv. .

Abstract

This work aimed at addressing the problem of hexavalent chromium pollution in the water environment, designing and preparing the Cu/Cu2O/NH2-MIL-88B (Fe) heterojunction material with NH2-MIL-88B (Fe) as the carrier, Cu/Cu2O was loaded on NH2-MIL-88B (Fe) by light-assisted reduction. The loading of Cu2O effectively improves the visible light absorption capacity of the composite material. The SPR effect of Cu improves the separation and transfer of photogenerated carriers in the composite material. Performance test results showed that under the condition of pH = 2, using ethanol as a sacrificial agent, Cu/Cu2O/NH2-MIL-88B (Fe) (15 wt%) had a photocatalytic adsorption reduction rate of Cr(vi) of 96.3% in 60 minutes of adsorption in the dark and 150 minutes of photocatalytic reduction, which was 1.39 times that of NH2-MIL-88B (Fe). In addition, the composite material had good stability and recyclability, and the reduction efficiency still reached 88.9% after three cycles.

PubMed Disclaimer

Conflict of interest statement

There are no conflicts to declare.

Figures

Scheme 1
Scheme 1. Diagram of the synthetic processes of Cu/Cu2O/NH2-MIL-88B (Fe).
Fig. 1
Fig. 1. XRD spectra of NH2-MIL-88B (Fe) and Cu/Cu2O/NH2-MIL-88B (Fe) (a) and Cu/Cu2O/NH2-MIL-88B (Fe) with different loadings (b).
Fig. 2
Fig. 2. FT-IR spectra of NH2-MIL-88B (Fe) and Cu/Cu2O/NH2-MIL-88B (Fe) samples (a) and Cu/Cu2O/NH2-MIL-88B (Fe) with different loadings (b).
Fig. 3
Fig. 3. SEM image of NH2-MIL-88B (Fe) (a); SEM image (b), TEM image (c), HRTEM image (d) of Cu/Cu2O/NH2-MIL-88B (Fe).
Fig. 4
Fig. 4. XPS spectra of Cu/Cu2O/NH2-MIL-88B (Fe) (15 wt%) samples (a) survey; (b) C 1s; (c) Fe 2p; (d) Cu 2p, respectively.
Fig. 5
Fig. 5. DRS spectra (a) and the band gaps (b) of NH2-MIL-88B (Fe) and Cu/Cu2O/NH2-MIL-88B (Fe) samples.
Fig. 6
Fig. 6. Photocatalytic reduction efficiency diagram of Cr(vi) under visible light conditions (a) and the fitting of the pseudo-first-order linear line for the photocatalytic reaction (b).
Fig. 7
Fig. 7. Photocatalytic reduction efficiency diagram of Cu/Cu2O/NH2-MIL-88B (Fe) samples to Cr(vi) under different conditions (a) different Cu/Cu2O loading, (b) pH values, (c) different concentration of Cu/Cu2O/NH2-MIL-88B (Fe), (d) ethanol addition.
Fig. 8
Fig. 8. Reusability for photocatalytic reduction of Cr(vi).
Fig. 9
Fig. 9. Possible mechanism diagram of photocatalytic reduction of Cr(vi) on Cu/Cu2O/NH2-MIL-88B (Fe).
See this image and copyright information in PMC

References

    1. Müller M. Hermes S. Kähler K. van den Berg M. W. E. Muhler M. Fischer R. A. Chem. Mater. 2008;20:4576–4587.
    1. Shi Z. Zhang Y. Duoerkun G. Cao W. Liu T. Zhang L. Liu J. Li M. Chen Z. Environ. Sci.: Nano. 2020;7:2708–2722.
    1. Yang D. Fang W. Zhang H. Sun H. Gu X. Chen H. Luo J. J. Hazard. Mater. 2024;476:134985. - PubMed
    1. Senamart N. Deekamwong K. Wittayakun J. Prayoonpokarach S. Chanlek N. Poo-arporn Y. Wannapaiboon S. Kidkhunthod P. Loiha S. RSC Adv. 2022;12:25578–25586. - PMC - PubMed
    1. Jamaluddin N. S. Alias N. H. Samitsu S. Othman N. H. Jaafar J. Marpani F. Lau W. J. Tan Y. Z. J. Environ. Chem. Eng. 2022;10:108665.

LinkOut - more resources