Preparation method of porous g-C3N4 nanosheet and application thereof

The invention belongs to the technical field of preparation of porous nano materials, and particularly relates to a preparation method of a porous g-C3N4 nanosheet and an application thereof. The preparation method comprises the following steps: (1) uniformly mixing melamine, gluconate and deionized water to obtain an emulsion; (2) putting the emulsion into a high-pressure kettle for hydrothermal reaction to obtain suspension liquid; (3) carrying out solid-liquid separation on the suspension, and washing and drying the obtained solid to obtain a hydrothermal precursor; and (4) calcining the hydrothermal precursor in air to obtain the porous g-C3N4 nanosheet. Compared with bulk phase g-C3N4, the porous g-C3N4 nanosheet prepared by the method has a larger specific surface area, the electron transfer rate is accelerated, and compounding of electron hole pairs is effectively inhibited; due to successful preparation of the two-dimensional nanosheets and the porous morphology, the product has more active sites, the