Porphyrin-based porous organic framework: An efficient and stable peroxidase-mimicking nanozyme for detection of H2O2 and evaluation of antioxidant

•A novel porphyrin-based porous organic polymer (PPOP) is designed and prepared.•Large surface area with adequately exposed catalytic active sites of the PPOP ensures its high peroxidase-like activity.•A versatile colorimetric biosensor for H2O2, glucose and three antioxidants detection with high sensitivity and stability is established with PPOP.•The distinguishing inhibitory behaviors of three antioxidants to PPOP imply different antioxidative mechanisms.