Preparation Of Nano-Carbon Photocatalysts And Their Photocatalytic Hydrogen Production Performances

Semiconductor photocatalytic hydrogen production technology is considered as one of the most promising strategies to overcome the challenges of environmental pollution and global energy shortage.As a new type of nano material,nano carbon has been proved to have photocatalytic activity.However,the absorption range of nano carbon photocatalysts to sunlight is narrow,which seriously limits the improvement of photocatalytic performance.Therefore,the construction of efficient and broad spectral light absorption of nano carbon photocatalyst is the current research hotspot.In this paper,the optical properties and charge separation efficiency of nano carbon were controlled by doping a variety of heteroatoms,so as to achieve efficient photocatalytic hydrogen production.The main contents are as follows:1.An oxygen nitrogen co-doped ONCS photocatalyst was synthesized by hydrothermal method.ONCS photocatalyst shows a wide visible light absorption capacity,and the energy band position meets the thermodynamic requirements of water decomposition and molecular oxygen activation.In addition,the rich amorphous/crystalline interface in ONCS matrix promotes the separation and transfer kinetics of photogenerated carriers.Therefore,ONCS has good photocatalytic activity for hydrogen production and benzyl alcohol oxidation under visible light,even under far-infrared light and near-infrared light.In addition,ONCS can still effectively drive hydrogen synthesis under natural light irradiation,indicating its great potential in solar energy collection and conversion.2.A nitrogen,oxygen and sulfur Co doped CNSO photocatalyst was synthesized by photo driving method at room temperature.The results show that the absorption band edge of the prepared CNSO photocatalyst reaches the red light region,and the energy band position of CNSO meets the thermodynamic requirements of photocatalytic decomposition of hydrogen in water.Under the conditions of 450 nm（visible light）,660 nm（red light）,730 nm（far red light）and 800 nm（near-infrared light）,the hydrogen production efficiency of CNSO photocatalyst reached 23.75μmol h^-1、0.51μmol h^-1、0.02μmol h^-1、0.01μmol h^-1,respectively.