▎ 摘　　要

NOVELTY - A boron-sulfur co-doped graphene carbon nitride is prepared by dissolving adding boric acid, melamine and molybdenum disulfide in absolute ethanol, ultrasonically processing, drying, grinding, placing into tubular furnace, heating, naturally cooling, taking out, grinding and crushing, dissolving in ultrapure water, ultrasonically shaking, placing in centrifugal tube, centrifuging, and taking supernatant. USE - Method for preparing boron-sulfur co-doped graphene carbon nitride (claimed). ADVANTAGE - The detection is rapid, sensitive and selective. DETAILED DESCRIPTION - A boron-sulfur co-doped graphene carbon nitride is prepared by dissolving adding 2 g boric acid, 2 g melamine and 0.5 g molybdenum disulfide in 100 mL absolute ethanol, ultrasonically processing for 1 hour, drying at 80 degrees C, grinding to obtain solid powder, placing into tubular furnace, heating under argon gas protection to 500 degrees C at speed of 5 degrees C/minute, maintaining for 2 hours, naturally cooling to room temperature, taking out, grinding and crushing, dissolving 50 mg product in 50 mL ultrapure water, ultrasonically shaking using 70% power for 2.5 hours, placing product in centrifugal tube, centrifuging for 10 minutes at speed of 12000 revolutions/minute (rpm), and taking supernatant. An INDEPENDENT CLAIM is included for application of boron-sulfur co-doped graphene carbon nitride in mercury ion detection comprising mixing 50 mu M cobalt ion, 12.5 mu M 5,10,15,20-tetrakis(1-methyl-4-pyridinio)porphyrin tetra(p-toluenesulfonate) (TMPyP), 15 mg/mL boron co-doped graphene carbon nitride and 2 mM phosphate buffer liquid to prepare solution with different concentrations of mercury ion, oscillating and shaking at 37 degrees C for 30 minutes, forming metal cobalt porphyrin, and using fluorescence spectral photometer to measure excitation wavelength at 420 nm.