Construction of Rich Surface Hydroxyl Caco3@Cuo for Efficient Activation of Peroxymonosulfate to Degrade Bisphenol a and Facilitate Carbon Dioxide Capture

In the process of catalytic oxidation degradation of toxic organic wastewater, detoxification of toxic organic pollutants, and adsorption of carbon dioxide released from the degradation process are two important processes, which need further study. In this study, a CaCO3@CuO composite with excellent PMS catalytic performance was synthesized, which could increase the degradation kinetic rate of BPA by 2.76-fold. This was CaCO3 carries a large number of surface hydroxyl groups, the introduction of CaCO3-based complex accelerates the adsorption of PMS. It was proved by electrochemical (CV, EIS, LSV) that the presence of CaCO3 weakened the electron transfer between CuO and CaCO3, and formed CuO electron-enriched center, which strengthened the electron transfer in CuO clusters. The electron transfer from Cu(II) to Cu(I) was accelerated due to the electron-donating effect of peroxymonosulfate (PMS). This system can effectively remove organic pollutants in natural water in a wide pH range (3-11). The Toxicity Estimation Software Tool (TEST) evaluated the toxicity of intermediate products. The carbon dioxide capture experiment proved that the CaCO3@CuO-3/PMS system could absorb 57.58 % of the released carbon dioxide under alkaline conditions, which effectively reduced the emission of greenhouse gas. This study provides a new method for the efficient treatment of wastewater containing toxic organic pollutants by nonradical pathway in complex water environments and efficiently adsorption of the carbon dioxide released during the degradation process.