Preparation Of G-C₃N₄ Based Z Mechanism Composite Photocatalyst And Its Application In Environmental Treatment

With the development of the chemical industry,the problem of water pollution has become more serious.As one of the main hazardous waste waters,dye wastewater has the characteristics of high pollutant concentration,complex composition and it's difficult to be degraded,which has a great impact on the ecological environment and human health.Photocatalytic technology is powered by inexhaustible solar energy.It has the advantages of high efficiency,low cost and it has no pollution.It has broad application prospects in various environmental problems.As a photocatalyst,graphite phase carbonitride?g-C₃N₄?is inexpensive,stable in performance and easy to synthesize.Because its electronic band structure is 2.7 eV,it's easy to regulate,and its photoelectric conversion efficiency is high,which is widely used in the field of photocatalysis and is an environmentally friendly green catalyst.At the same time,g-C₃N₄ has relatively low activity on pollutant degradation due to large band gap and fast electron-hole pair recombination.In view of these defects,the photocatalytic activity is mainly improved by chemical doping,physical recombination,and microstructure adjustment.In this paper,g-C₃N₄ was prepared by calcination method,and it was compounded by hydrothermal method,grinding method and calcination method to prepare Z-system composite photocatalyst.In terms of material characterization,X-ray diffractometry?XRD?,scanning electron microscopy?SEM?,etc.were used to study the structure and morphology of photocatalysts;Fourier transform infrared spectroscopy?FT-IR?,energy dispersive X-ray spectroscopy?EDX?,etc.were used to study the functional groups and composition of the substance;Fluorescence spectroscopy?PL?,UV-vis spectroscopy?UV-vis?,etc.were used to study the energy band structure and optical properties;Electrochemical workstations was used to study the photoelectric conversion efficiency of the catalyst.Rhodamine B?RhB?solution was used to simulate dye wastewater,the degradation performance of monomer photocatalyst and composite photocatalyst was compared,and its application in future environmental treatment was prospected.