前驱体两步预处理制备高光催化活性的氮化碳

Precursor Two-step Pretreatment to Prepare Carbon Nitride with High Photocatalytic Activity

为提高石墨相氮化碳的光催化性能,以三聚氰胺为前驱体,首次采用前驱体水热结合研磨预处理,制备了高光催化活性的氮化碳,其在光照30 min下可降解97%的罗丹明B,并利用XRD、FT-IR、SEM、UV-DRS、PL和氮气吸-脱附测试等手段进行表征。结果表明,其活性的增加源于其增大的比表面积及载流子分离效率的提高。经循环稳定性测试证明,该样品拥有出色的循环稳定性能。结合自由基捕获实验,确定h^(+)和·O_(2)^(-)为主要的反应活性物质。

In order to improve the photocatalytic performance of graphtic carbon nitride.Highphotocatalytic activity g-C 3N 4 were firstly prepared by directly thermal calcination of the hydrothermally and grindly pretreated melamine as precursor.,the prepared g-C 3N 4 exhibited an effective Rhodamine B(RhB)degradation rate of 97%within 30 min of illumination.And characterizing it by XRD,FT-IR,SEM,UV-DRS,PL and nitrogen adsorption-desorption techniques.The results showed that the increase in its activity result from its increased specific surface area and improvedcarrier separation efficiency.The cycle stability test proves that the sample has excellent cycle stability performance.Based on free radical capture experiments,h^(+) and ·O_(2)^(-) are the main active species.