Constructing Heptazine‐COF@TiO2 Heterojunction Photocatalysts for Efficient Photodegradation of Acetaminophen under Visible Light

Abstract Constructing heterojunction photocatalysts are widely applied to boost the photocatalytic activity of materials. Here, a novel covalent organic framework (COF) material with heptazine units was developed and hybridized with TiO 2 nano particles (NPs) to fabricate the Heptazine‐COF@TiO 2 photocatalysts for acetaminophen (AAP) photodegradation. The successfully assembled heptazine unit endows the Heptazine‐COF with outstanding semiconductor property (optical bandgap is 2.53 eV). The synthesized Heptazine‐COF@TiO 2 hybrids is proved to have the heterojunction structure with high visible light activity and fast charge‐carrier mobility, and exhibits better performance in photodegradation of AAP under visible light. The excellent photodegradation efficiency (rate constant: 0.758 min −1 ) and high reusability (rate constant: 0.452 min −1 in the 6 th cycles) of the optimized sample outperform the traditional inorganic photocatalysts and other heterojunction photocatalysts. In addition, these photocatalysts present universal degradation activity for other dyes and antibiotics.