Tube wall delamination engineering induces photogenerated carrier separation to achieve photocatalytic performance improvement of tubular g-C3N4.

Morphology adjustment is a feasible method to change the physicochemical properties of photocatalysts. The issue that excessively thick tube wall of tubular g-C 3 N 4 is not conducive to the electron migration from inside to the surface thus inhibiting the separation of photogenerated carriers has always been ignored. Potassium ions were used to regulate the structure of the tubular supramolecular precursor by breaking hydrogen bonds, thereby promoting the synthesis of delaminated laminar tubular g-C 3 N 4 (K-CN), which not only shortened the transfer distance of photogenerated electrons but also provided abundant reaction active sites. Experiments and DFT calculations were combined to reveal the details of the physicochemical properties of K-CN. The photocatalytic capacity of K-CN for tetracycline hydrochloride (TCH) degradation and H 2 O 2 generation were 83% and 133 μM, respectively. This work not only synthesized a novel delaminated tubular g-C 3 N 4 but also provided a strategy and inspiration for structure and performance optimization for tubular g-C 3 N 4. [Display omitted] • Supramolecular self-assembly produced tubular g-C 3 N 4 precursors. • Potassium ions was influenced on the supramolecular self-assembly. • Destruction of the hydrogen bond induced delamination of tubular g-C 3 N 4. • Experiment and DFT calculation were combined to reveal the properties of K-CN. • Delamination promoted K-CN showed strong photocatalytic activity. [ABSTRACT FROM AUTHOR]