Visible-Light-Enhanced Photocatalytic Activities for Degradation of Organics by Chromium Acetylacetone Supported on UiO-66-NH2

The constructing of efficient photocatalysts for environmental remediation has attracted a great deal of attention in recent years. In this paper, Cr /UiO-66-NH2 was synthesized by the chromium acetylacetone grafted on UiO-66-NH2 directly and UiO-66-NH2-SA-Cr (anchored on the Schiff base UiO-66-NH2-SA with chemical bonds) was prepared by post-synthesis method, which both provided such support in degrading tetracycline (TC) and xylenol orange (XO) under visible light. Compared with UiO-66-NH2 and Cr /UiO-66-NH2, the photocatalytic experiments indicated that UiO-66-NH2-SA-Cr possessed significant enhanced photocatalytic activity, with 76.5 % of tetracycline (TC) and 71.5 % of xylenol orange (XO) being removed under the optimization of experimental conditions. The enhanced photocatalytic activity of UiO-66-NH2-SA-Cr could be attributed to the obvious decrease in the band gap, which could enhance the capacity of visible-light absorption, and the presence of catalytic sites on the Chromium Schiff base complex was also a key factor for the photocatalytic performance, which could achieve high-efficiency catalytic activity. Furthermore, these materials also exhibited a good recyclability with almost unchanged degradation efficiency after five recycling tests. Above these indicated that these materials mentioned had great potential in the field of wastewater treatment and antibiotic contaminant.