Pd Nps Encapsulated by Cof in Nitrogen-Doped Macroporous Chitosan Carbon Microspheres Act as an Efficient and Recyclable Multifunctional Catalyst

•The core-shell structured MCM@Pd@COF were prepared using a coral structured COF shell.•The outer coral-like COF structure effectively resists the leaching of Pd NPs.•MCM@Pd@COF showed excellent activity in the Suzuki reaction (TOF = 3.4 × 105 h−1).•The Kapp value of MCM@Pd@COF in the reduction reaction of 4-NP was 0.95 min−1.•MCM@Pd@COF exhibited superior photocatalytic activity for degradation of RhB.