College of Chemical Engineering, Hebei Key Laboratory for Environment Photocatalytic and Electrocatalytic Materials , North China University of Science and Technology , Tangshan 063210 , P. R. China.
ACS Appl Mater Interfaces. 2018 Mar 14;10(10):8758-8769. doi: 10.1021/acsami.8b00198. Epub 2018 Mar 1.
Metal-organic frameworks (MOFs) are a new type of functional material that is self-assembled by metal ions and organic ligands. In this paper, a bimetal-organic framework was synthesized and stripped into two-dimensional nanosheets structure via an ultrasonic method. We coated the UMOFNs (ultrathinning MOFs into two-dimensional nanosheets) on AgPO nanoparticles to obtain AgPO@UMOFNs core-shell photocatalysts. Under visible-light irradiation, the degradation of phenol was 100% within 16 min, and the degradation of biphenyl A was 98.9% within 20 min via AgPO@UMOFNs (5 wt %). These values were 1.6- and 1.8-times higher than AgPO, respectively. The activity of the AgPO@UMOFNs increased due to the synergistic effects. The π-π bonds of the organic ligands and weak interactions between UMOFNs and AgPO collectively promote charge transfer. In addition, matching energy-level structures and a sufficiently large contact area accelerate the separation of the photogenerated charges and improve the activity. This remarkably improves the photocatalytic activity.
金属-有机骨架（MOFs）是一种新型功能材料，由金属离子和有机配体自组装而成。本文通过超声法合成了一种双金属-有机骨架，并将其剥离成二维纳米片结构。我们将 UMOFNs（超薄 MOFs 成二维纳米片）涂覆在 AgPO 纳米颗粒上，得到 AgPO@UMOFNs 核壳光催化剂。在可见光照射下，AgPO@UMOFNs（5wt%）在 16 分钟内可使苯酚完全降解，在 20 分钟内可使联苯 A 降解 98.9%。这些值分别比 AgPO 高 1.6 倍和 1.8 倍。AgPO@UMOFNs 的活性因协同效应而提高。有机配体的π-π键和 UMOFNs 与 AgPO 之间的弱相互作用共同促进了电荷转移。此外，能级结构的匹配和足够大的接触面积加速了光生电荷的分离，提高了活性。这显著提高了光催化活性。
