Thermally treated zeolitic imidazolate framework-8 (ZIF-8) for visible light photocatalytic degradation of gaseous formaldehyde

Tianqi Wang, Yufei Wang, Mingzhe Sun, Aamir Hanif, Hao Wu, Qinfen Gu, Yong Sik Ok, Daniel C.W. Tsang, Jiyang Li, Jihong Yu, Jin Shang

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1 Citation (Scopus)

Abstract

The development of wide-spectrum responsive photocatalysts for efficient formaldehyde (HCHO) removal is highly desired yet remains a great challenge. Here we successfully converted zeolitic imidazolate framework-8 (ZIF-8), one of the most well-studied metal-organic frameworks (MOFs), from routine ultraviolet-driven to novel broad-spectrum-driven photocatalyst via a facile thermal treatment. The isocyanate groups (-NCO) formed in the thermally treated ZIF-8 (ZIF-8-T) is crucial in enabling the superior photocatalytic performance in formaldehyde degradation. Specifically, the best-performing ZIF-8-T sample showed around 2.1 and 9.4 times the HCHO adsorption amount and the solar photocatalytic degradation rate, respectively, of pristine ZIF-8. In addition, ZIF-8-T exhibited visible light (λ ≥ 400 nm) photocatalytic HCHO degradation performance, photo-converting 72% and nearly 100% of 20 ppm and 10 ppm HCHO within 1 hour, respectively. This work affords new insights and knowledge that inspire and inform the design and development of MOF-based photocatalysts with broad-spectrum responses for efficient air purification operations.

Original languageEnglish
Pages (from-to)6670-6681
Number of pages12
JournalChemical Science
Volume11
Issue number26
DOIs
Publication statusPublished - 2020 Jul 14

ASJC Scopus subject areas

  • Chemistry(all)

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    Wang, T., Wang, Y., Sun, M., Hanif, A., Wu, H., Gu, Q., Ok, Y. S., Tsang, D. C. W., Li, J., Yu, J., & Shang, J. (2020). Thermally treated zeolitic imidazolate framework-8 (ZIF-8) for visible light photocatalytic degradation of gaseous formaldehyde. Chemical Science, 11(26), 6670-6681. https://doi.org/10.1039/d0sc01397h