Abstract
The contamination of toxic Cr(VI) oxoanion in water has been a major problem in water treatment and public health concerns. Thus, the development of new materials for high efficiency, high selectivity and reusability for Cr(VI) trapping remains challenge. Herein, the water-stable neutral two-dimensional (2D) metal-organic framework (MOF) of [Co(1,4-phda)(4,4′-bpp)(H2O)2](H2O)2 (1) (4,4′-bpp = 1,3-bis(4-pyridyl)propane and 1,4-H2phda = 1,4-phenylenediacetic acid) with high flexibility of the framework has been synthesized. Remarkably, 1 exhibits an excellent ability to trap Cr2O72‾ in a wide pH range (pH ≈ 2–9) through reversible single-crystal-to-single-crystal (2D→3D) transformation and chemisorption processes via oxoanion coordination bond which is a new pathway for Cr(VI) trapping. Among adsorbent materials, the capture of Cr2O72‾ in 1 shows high adsorption efficiency (176 mg g−1) with exceptional high selectivity associated with naked eye. This material also exhibits a good reusability without loss of Cr(VI) trapping-releasing ability.
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