▎ 摘　　要

NOVELTY - Lead-free perovskite type graphene-like carbon nitride visible photocatalyst, comprises lead-free perovskite cesium tin chloride (Cs2SnCl6), and two-dimensional carbon nitride material; where the photocatalyst is exists in the form of heterojunction. USE - Used as lead-free perovskite type graphene-like carbon nitride visible photocatalyst. ADVANTAGE - The photocatalyst: has visible light performance of higher than 20% compared with carbon nitride photocatalyst. The method: provides a new idea for the combination of lead-free halide perovskite and photocatalytic materials; has mild reaction condition; and is simple, and low cost. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing lead-free perovskite type graphene-like carbon nitride visible photocatalyst, comprising (i) adding cesium chloride and tin(II) chloride into container, then adding hydrochloric acid solution into the container, ultra-sonicating, and placing in an oven for heating, cooling the oven to room temperature and allowing to stand, and washing and drying the obtained samples in oven to obtain cesium tin chloride (Cs2SnCl6), (ii) placing melamine in crucible, covering crucible lid, placing in muffle furnace for calcining under static air, maintaining the calcination temperature, time, and heating rate, and naturally cooling to room temperature to obtain carbon nitride, and (iii) placing the carbon nitride in an agate mortar and grinding fully until the sample is uniform, and adding the cesium tin chloride to continuing grinding to obtain final product.