Regulable metal-oxo-bridge configurations as electron transfer bridge to promote Cu(II)/Cu(I) redox behavior for...

Constructing metal-oxo-bridge coordination as electron transfer bridge is benefit for the catalysis acceleration towards water pollutants treatment. In this work, regulable Cu-O-C configuration was constructed through tunable ratio of copper aluminum oxide (CuAl_xO_y) and porous g-C₃N₄ (p-CN), employed as electron transfer bridge for Cu^(II)/Cu^(I) redox behavior modulation to realize sufficient peroxymonosulfate (PMS) activation. A series of characterization demonstrated that the composites presents porous structure for p-CN contribution, and the oxygen content plays crucial role in Cu-O-C bonds fabrication. The proper ratio of CuAl_xO_y and p-CN is conducive to create an oxygen-rich environment, resulting in high dispersed copper atoms connect with oxygen in p-CN matrix. As a result, 2:1 CuAl@p-CN possesses appropriate Cu-O-C configuration, has favorable electron transfer environment for rapid redox behavior of Cu^(II)/Cu^(I), leading to excellent PMS activation for mirco-polluted veterinary antibiotics elimination. The activated PMS produced active species and followed the priority order of ¹O₂ > SO₄•^- > •OH for contaminants degradation, and the specific porous structure reduce the migration distance of active species for efficient catalysis. This study offers a deeper insight into the construction of regulable metal-oxo-bridge configurations for electron transfer towards PMS activation and contributes to an efficient strategy for wastewater remediation.