The Photocatalytic Performance Of Phthalocyanine Nanoparticles And Graphite-like Carbon Nitride

As a kind of green environmental protection technology,Photocatalytic technology has wide application prospect in solving the energy crisis and environmental pollutant control.How to prepare a high-performance catalyst has becoming a hot topic in recent years.After decades of research,the mechanism of organic semiconductor photocatalytic studies have been more clear and some of the conclusions is validated.semiconductor photocatalytic made great achievements,but is far from achieving the ideal condition.The main problems of the photocatalytic technology are low solar energy utilization,low quantum efficiency and poor stability.These problems can be solved by the way of dye sensitization,adjusting the catalyst size,noble metal deposition,increasing the catalyst surface.The main research content of this paper:?1?We propose easy methods for the preparation of CoPcS nanoparticle by ultrasonic and CoPc nanoparticle by replacement of solvent.The diameter of spherical CoPcS nanoparticle and CoPc nanoparticle is about 7nm and 4nm respectively.Phthalocyanine nanoparticle not only have advantages in absorption of visible light and chemical stability,but also play to the superiority in large specific surface area,more catalytic site and easy separation of light carrier.Phthalocyanine nanoparticle is found to have impressive catalytic activity for photocatalytic proton reduction to H₂ in a noble-metal-free system composed of organic dye fluorescein?FL?as the photosensitizer and triethylamine?TEA?as the sacrificial electron donor.We try to find the best experimental conditions by adjust variables including the concentration of catalyst,FL,TEA and pH.The system of CoPcS maintains its activity for catalyst 20 hours with a turnover number of 206.And the system of CoPc maintains its activity for catalyst 10 hours with a turnover number of 147.To ensure the source of hydrogen is water instead of other components,experiments with D₂O in place of H₂O are conducted.Catalytic principle of phthalocyanine nanoparticle is calculated using Gaussian 09 finally.?2?Porous g-C₃N₄ photocatalytic material is prepared using the method of microwave rapid heating by dicyandiamide as the raw material and urea as soft templates.Microwave method solves the problems of wasting time and energy and improve the efficiency of the preparation of catalyst.Large quantities of g-C₃N₄ can be synthesized in a short period of time.We find that the g-C₃N₄ is two-dimensional lamellar structure,which consist of several layers of nanometer piece from TEM.The structure of g-C₃N₄ is not damaged and specific surface area increased three times by analysis of IR and BET.The UV-vis absorption edge of g-C₃N₄is extended from 460nm to 600nm,meaning that the catalytic efficiency of this noval g-C₃N₄can be greatly improved.The hydrogen production and rhodamine B degradation capacity of the g-C₃N₄ under visible light is detected by using TEOA as a sacrificial agent,Pt as cocatalyst.The hydrogen production rate of porous g-C₃N₄ is 1425?mol·g^-1·h^-1.