Thermally treated zeolitic imidazolate framework-8 (ZIF-8) for visible light photocatalytic degradation of gaseous formaldehyde. Issue 26 (27th May 2020)

• Record Type: Journal Article
• Authors: Wang, Tianqi; Wang, Yufei; Sun, Mingzhe; Hanif, Aamir; Wu, Hao; Gu, Qinfen; Ok, Yong Sik; Tsang, Daniel C. W.; Li, Jiyang; Yu, Jihong; Shang, Jin
• Is Part Of: Chemical science. Volume 11:Issue 26(2020)
• Page Start: 6670
• Page End: 6681
• Publication Date: 2020-05-27
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d0sc01397h
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : The isocyanate groups (–NCO) derived from –NC– bonds in the organic ligands enables the thermally treated ZIF-8 to act as wide-spectrum photocatalyst. 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C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.