Study On Photocatalytic Degradation Of Organic Wastewater By G-C₃N₄ Nanomaterials

Pyridine and Orange II are all toxic compounds that are refractory to degradation and are widely used in the fields of medicine and chemical industry,and the generated industrial wastewater causes serious environmental pollution.These compounds have very stable largeπbonds,traditional biomass degradation methods are difficult to handle,which has a serious impact on the environment and life.Therefore,the photocatalysis method with low energy consumption,high efficiency and no secondary pollution is used to treat it in this article.Firstly,this study synthesized the photocatalyst g-C₃N₄/TiO₂（PCN）by low-temperature calcination method for photodegradation of nitrogen heterocyclic organic compounds such as pyridine.On the one hand,the one-step synthesis of the catalyst by low-temperature thermal polymerization can not only adjust the structure of g-C₃N₄,improve the photocatalytic performance of g-C₃N₄,but also ensure that P25 will not change from anatase to rutile at low temperature.The structural morphology of the latter P25 still exists in the ratio of 80:20,which ensures the best catalytic performance of the substance.On the other hand,it is found that the catalyst has good catalytic performance and cycle stability through degradation experiments;and it can also find that the two active substances·O₂^-and·OH play a major role in the degradation process through mechanism research through degradation experiments.The substrate expansion experiment found that this type of catalyst has excellent degradation performance in the treatment of nitrogen heterocyclic organic compounds.In short,this type of catalyst is a very promising photocatalytic material which has a wide range of application value in the treatment of nitrogen heterocyclic organic pollutants and is expected to be mass-produced and applied in the industrial field.Secondly,this paper also designed a NiCu bimetal modified carbon nitride catalyst for the treatment of azo dyes.We find that the treatment of waste water pollutants by adsorption method has the disadvantages of large amount of catalyst and expensive regeneration.However,to treat this process only by photocatalysis method,the amount of waste water treated is too low and the reaction time is too long.Therefore,this study designed a new experimental process:the synergistic effect of adsorption-photocatalysis to degrade azo dyes,which not only solved the saturation problem in the adsorption method,but also solved the problem of too long reaction time in photocatalytic degradation.Therefore,this article adopts two modification methods of semiconductor compounding and co-catalyst loading to improve the catalytic performance of carbon nitride,and has made significant progress in the field of pollutant degradation,which is expected to be applied in the industrial field.