[Using HKUST-1 as a Template for Copper Oxides Preparation to Activate Peroxymonosulfate for RhB Degradation]

Using Cu-MOF (HKUST-1) as a template, copper oxide was prepared by heat treatment under different temperatures in this study. The effect of treatment temperature on the composition and morphology of the products were studied. The catalytic abilities of the copper oxide products were tested through a series of experiments of activating peroxymonosulfate (PMS) to degrade RhB under different conditions. The results of XRD, SEM, and XPS show that the product is gradually transformed from a Cu₂O/CuO mixture into pure CuO with the increase of heat treatment temperature. The original octahedron structure of HKUST-1 was collapsed. Under neutral pH conditions, when the dosage of PMS and CuO-650 was 1.00 mmol·L^-1 and 0.20 g·L^-1, respectively, the total degradation of RhB (concentration of 0.10 mmol·L^-1) could be completed within 90 min. In addition, CuO-650 also has many advantages, such as it can be applied within a wide range of pH values. In addition, the copper ion dissolution rate was low (1.309 mg·L^-1 at pH=3 and 0.987 mg·L^-1 at pH=7), and it has great recyclability and stability. These characteristics further proved that CuO-650 can be used as a promising catalyst for PMS activation.