Construction Of Carbon Modified Carbon Nitride Fiber For Photodegradation Of Organic Pollutants

Graphitized carbon nitride(g-C3N4)is a kind of nonmetallic conjugated polymer,which has become a new generation of visible light response photocatalyst.The bulk g-C3N4 suffers from low absorption of visible light,low specific surface area,high recombination rate of photogenerated electron-hole pairs and thus low photocatalytic activity.Therefore,g-C3N4 needs to be improved in order to play a greater role in the field of photocatalysis.The most effective way to improve the photocatalytic performance of g-C3N4 is to construct a controllable special morphology,and element doping is an effective method to adjust the unique electronic structure and band gap,which can greatly broaden the range of photoresponse and enhance the charge separation.In this paper,two different g-C3N4 with one-dimensional fibrous morphology were synthesized by two different templates,and further modified with element doping.Finally,excellent photocatalysts were obtainedSBA-15 modified by carboxylic acid is used as hard template and dicyandiamide as precursor,one-dimensional fibrous g-C3N4 with hollow structure can be synthesized The successful synthesis of the material was proved by SEM,FT-IR et al.the photochemical properties of the material were studied by PL,photocurrent response et al.;and the photocatalytic activity of the material was studied by photodegradation of organic pollutants.The results show that the material has excellent photocatalytic properties.The degradation rate constants of the material for methylene blue are 8.7 times and 5.6 times higher than those of bulk g-C3N4 and mpg-C3N4,respectivelyCarbon fiber derived from metal organic frame(MOF)is used as hard template,dicyandiamide as precursor and thiourea as sulfur source,sulfur-doped g-C3N4 with one-dimensional fibrous morphology can be synthesized.For the material,the successful synthesis was proved by SEM,FT-IR et al.;the photochemical properties were studied by DRS,photocurrent response et al.;and the photocatalytic activity was studied by photodegradation of organic dyestuff.The effects of calcination atmosphere and thiourea dosage on the photocatalytic activity of the catalyst were also discussed The results show that the obtained materials have the best photocatalytic activity,when the ratio of nitrogen to air is 80:20 and the ratio of thiourea to dicyandiamide is 1:1 The specific rate constant of methylene blue degradation is as high as 2.368 min-1g-1.