摘要
ZIF-8-derived carbon materials possess great advantages in the field of electrochemical adsorption due to their abundant porous structures, excellent specific surface areas, and good electrical conductivity. The efficient separation and capture of bromide ions (Br − ) from brine systems represent a critical pathway to achieving high-efficiency utilization of brine resources and environmental protection. In this study, a nitrogen (N)-doped ZIF-8-derived carbon material (NC-800) was synthesized via high-temperature calcination at 800 °C, and its performance in separating and capturing Br − from brine was systematically investigated. Electrochemical test results showed that the NC-800 membrane electrode achieved a maximum intercalation capacity of 115.65 mg·g −1 for Br − at an oxidation voltage of 1.0 V . Moreover, the captured Br − could be successfully converted into elemental bromine (Br₂) through carbon tetrachloride (CCl₄) extraction, realizing the resource recovery of Br − . Cyclic stability tests indicated that after 10 adsorption-desorption cycles, the maximum intercalation capacity of the electrode remained at 57 mg·g −1 , demonstrating excellent cyclic reusability. Systematic characterizations were conducted to analyze the microstructure of NC-800 and the adsorption mechanism of Br − . Combined with electrochemical performance analysis, the effects of different operating conditions on Br − adsorption performance were examined. Density functional theory (DFT) was employed to verify the adsorption mechanism of Br − on NC-800, and the results confirmed that nitrogen doping significantly enhances the Br − adsorption capacity of porous carbon materials. This study deepens the understanding of the “physical-chemical synergistic adsorption mechanism” during Br − separation by the NC-800 material, offering new insights for the development of sustainable bromine resource recovery technologies.
危险品化学品经营许可证（带存储）