Two‐Dimensional (2D) Porous Zinc Oxides Derived from the Coordination Polymer via Chemical‐Assisted Phase Transition

Two‐dimensional (2D) porous zinc oxides (ZnO) were successfully prepared via chemical treatment and thermal annealing of coordination polymers (CPs) precursors consisting of Zn(II) ion and fumarate ligand. The morphology, crystalline phase, chemical state, and surface area of the resultant ZnO were characterized. It is experimentally discovered that the crystal phase of the CP bearing Zn(II) ions is transformed to the zinc hydroxide crystal phase by chemical treatment using ammonia water. The prepared CP‐derived porous 2D ZnO exhibited enhanced photocatalytic efficiency for dye degradation under black‐light irradiation (365 nm) compared to CP‐derived non‐porous ZnO without a chemical‐assisted phase transition process. We discovered a fast strategy for the preparation of coordination polymer‐derived 2D porous zinc oxide via chemical‐assisted phase transition and thermal treatment. Treatment of the coordination polymer with ammonia in water triggered phase transition to zinc hydroxide. As a result, the prepared 2D porous zinc oxide showed better photocatalytic performance than 2D zinc oxide.