Study on Photocatalytic Properties and Mechanism of Layered Porous Carbon Nitride for Organic Compound Degradation
Graphite phase carbon nitride(g-C3N4)has attracted much attention due to its suitable band gap structure,good photoresponse,stable physicochemical properties,and low preparation price.However,due to its small specific surface area and low photocarrier separation efficiency,the material exhibits low photocatalytic activity.Urea was used as the precursor to synthesize carbon nitride.Through regulating the temperature and pressure in the synthesis process,carbon nitride with thin texture and layered porous surface was directly synthesized by one-step calcination method successfully.As a result,the specific surface area of g-C3N4 was increased from 8.13 m2·g-1 to 94.75 m2·g-1.Moreover,the photogenerated carrier separation efficiency of the material was obviously improved.In the experiment of degradation of organic compound,the degradation rate of 20 mg·L-1 Rhodamine B by layered porous carbon nitride(L-CN)reached 100%within 6 min,and the degradation rate was 7.7 times that of the bulk phase g-C3N4.The degradation rate of tetracycline by L-CN was 3.0 times that of g-C3N4,and the maximum degradation rate reached 85%.
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