Amine functionalized ZIF-8 as a visible-light-driven photocatalyst for Cr(VI) reduction

Chechia Hu, Yu Chi Huang, Ai Lun Chang, Mikihiro Nomura

研究成果: Article査読

69 被引用数 (Scopus)


Hexavalent chromium (Cr(VI)) is one of the most toxic and carcinogenic species known to living beings, the environment, and our eco-system. Thus, it is urgent to develop a facile and effective approach for Cr(VI) removal. Zinc-based zeolitic imidazolate frameworks (ZIF-8), a typical metal organic framework, have high porosity, large specific surface area, high chemical stability, and abundant surface grafting sites. These sites can be easily modified with ethylenediamine (EDA) using a solvothermal process to generate a material that can serve as a potential candidate for photocatalytic Cr(VI) reduction under visible light irradiation. Various EDA contents and synthetic conditions were adopted in an attempt to investigate the correlation between ZIF-8 amine-functionalization and photocatalytic Cr(VI) reduction. The amine functionalization and the grafting sites on ZIF-8 were determined to be located at the –CH3 site of the 2-methylimidazole chains via X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and nuclear magnetic resonance spectroscopy (NMR). Under optimum conditions, amine-functionalized ZIF-8 exhibited a normalized rate constant (k/specific surface area, kSSA), which was 9.8 times higher than that of unmodified ZIF-8 one for photocatalytic Cr(VI) reduction. The increased catalytic activity and range of visible light absorption of amine-functionalized ZIF-8 can be attributed to the increase in electron density due to the lone pairs of the surface grafted amines. In summary, amine-functionalized ZIF-8 could serve as a promising visible-light-active photocatalyst for environmental remediation.

ジャーナルJournal of Colloid and Interface Science
出版ステータスPublished - 2019 10月 1

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 生体材料
  • 表面、皮膜および薄膜
  • コロイド化学および表面化学


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