Carbonized poly(dopamine)@Co0 composites for the high-efficient removal of sulfamethoxazole: Role of direct electron-transfer and adsorption

作者：Lin, Jiawei; Li, Lichun; Ma, Lisha; Hu, Yongyou; Zhao, Cheng; Wei, Linting; Zheng, Guangming; Liu, Shugui; Shan, Qi; Zhao, Haoyi; Yin, Yi^*

来源：Chemical Engineering Journal, 2022, 445: 136668.

DOI：10.1016/j.cej.2022.136668

• Persulfate oxidation
• Cobalt
• Nitrogen-doped carbon material
• Poly(dopamine)
• Sulfamethoxazole

It is great challenge to design a simple approach to prepare Co-based N-doped carbon catalysts with high activity and minimum impact to the environment. Here, a novel carbonized poly(dopamine)-coated cobalt nanocomposite (CPDA@Co0) was synthesized via a simple and "zero-organic solvents" approach and employed to activate persulfate (PS) for sulfamethoxazole (SMX) degradation. The CPDA@Co0/PS system exhibited outstanding performance on SMX degradation over a wide pH range (3.0-8.5), and facilitated by acidic conditions and Cl-. For fair comparison, CPDA@Co0 under slightly acidic pH exhibited a much higher rate constant (0.121 min-1) than many reported catalysts. A direct electron-transfer pathway played a leading role in the oxidation, while adsorption of SMX on the surface of CPDA@Co0 might be the determining step. Since the synergistic effect between adsorption and catalysis, 10 mg/L SMX could be completely removed within 25 min, which provided a new strategy for removing organic pollutants from wastewater. Besides, the special core-shell structure could efficiently protect inner Co0 core from leaching. CPDA@Co0 could be easily separated via a permanent magnet and reused at least 5 times. This study might inspire others to develop effective and green PS activation processes for application in SMX treatment.

• 单位
  中山大学; y