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

Chemical Science
Tianqi WangJin Shang

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 (-N[double bond, length as m-dash]C[double bond, length as m-dash]O) 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.

References

Aug 6, 2010·Chemistry : a European Journal·Cláudia Gomes SilvaHermenegildo García
Apr 29, 2014·Chemical Society Reviews·Teng Zhang, Wenbin Lin
Apr 27, 2017·Scientific Reports·Valentina CappelloMauro Gemmi
Aug 15, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Yang CaoFanyang Mo

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Methods Mentioned

BETA
X-ray
thermal treatment
energy
transmission electron microscopy
electron paramagnetic resonance

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