MOF Derived Co−Fe nitrogen doped graphite carbon@crosslinked magnetic chitosan Micro−nanoreactor for environmental applications: Synergy enhancement effect of adsorption−PMS activation

Adsorption, as a simple and efficient water treatment technology, faces the problem that it can only transfer but not fully mineralize pollutants. Transition metal activated peroxymonosulfate (PMS) exhibit high catalytic activity, but leakage of metal ions poses potential health risks to the environment. To solve these problems, we ingeniously designed a micro−nanoreactor structure with glutaraldehyde crosslinked chitosan as the backbone and encapsulated MOF−derived Co−Fe nitrogen−doped graphitic carbon as the activated PMS reaction center (Co−Fe/NC@GCS). Due to its remarkable adsorption capacity, high concentration sulfamethoxazole could be efficiently enriched through electrostatic attraction and hydrogen bonding, and a small amount of PMS could be rapidly attracted and activated. Meanwhile, the synergistic mechanism of adsorption−PMS activation was also analyzed, and the degradation pathway of sulfamethoxazole was expounded. This study aims to develop a new strategy for the removal of emerging organic pollutants in water with such a system with strong adsorption and catalytic capabilities. • Chitosan micro-nanoreactor containing MOF-derived Co-Fe/NC was skillfully constructed • Simultaneous adsorption-PMS activation, degradation and resorption • CoFe alloy/CN promotes the redox cycle of Co 0 →Co 2+ ⇋Co 3+ and Fe 0 →Fe 2+ ⇋Fe 3+ • SMX was efficiently degraded by radical and non−radical pathways • Integrating adsorption and catalytic greatly improve catalyst activity and stability