▎ 摘　　要

NOVELTY - Preparing flower-shaped titanium nitride/carbon nitride/graphene composite nano-material comprises e.g. (i) adding concentrated hydrochloric acid and titanium citrate into mixed solvent to obtain sol-shaped substance, drying, grinding, adding powder into tubular furnace, passing high purity ammonia gas to obtain dark blue titanium nitride, (ii) dissolving nitrogen source and template lysine in anhydrous ethyl alcohol, and adding graphite oxide nano sheet and titanium nitride, ultrasonicating at room temperature, then transferring mixture into reactor, and carrying out hydro-thermal reaction. USE - The composite nano-materials are useful in microbial fuel cell electrodes and photolysis of water to hydrogen (claimed). ADVANTAGE - The method has simple preparation process, low production cost, short reaction cycle, environmentally friendly, and is suitable for large-scale industrial production. DETAILED DESCRIPTION - Preparing flower-shaped titanium nitride/carbon nitride/graphene composite nanomaterials comprises (i) adding 0.1-0.2 ml 36% concentrated hydrochloric acid and 15-20 g titanium citrate into mixed solvent of 50-80 ml absolute ethyl alcohol/water under continuous stirring condition, further stirring for 4-8 hours at 30-40 to obtain sol-shaped substance, and drying sol at 90-110 degrees C for 10-12 hours, then grinding into powder, then adding powder materials in tubular furnace, passing high purity ammonia gas at a flow rate of 100-130 ml/minute through the furnace before elevating the temperature, raising furnace temperature to 1000-1100 degrees C, maintaining the temperature for 6-8 hours, then introducing ammonia gas at room temperature to obtain dark blue titanium nitride, (ii) dissolving 6-10 g nitrogen source and 0.8-1 g template lysine in 40-50 ml anhydrous ethyl alcohol, and adding 4-6 g graphite oxide nano sheet and titanium nitride, ultrasonicating at room temperature for 1-2 hours, then transferring mixture into reactor having polytetrafluoroethylene lining, carrying out hydro-thermal reaction at 110-120 degrees C for 8-12 hours, centrifugally separating the product, washing, and drying at 80-100 degrees C, baking at 450-550 degrees C for 3-5 hours under nitrogen atmosphere to obtain final product.