Mn-P共掺杂氮化碳的制备及其光催化性能研究

采用四水氯化锰、磷酸氢二铵和三聚氰胺为原料制备了Mn-P共掺杂的石墨相氮化碳(g-C₃N₄)。使用X射线衍射光谱(XRD)、扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)、光致荧光光谱(PL)、紫外-可见漫反射光谱(UV-Vis DRS)、电化学阻抗谱(EIS)、瞬态光电流响应等分析测试手段对制备的催化剂进行了表征。结果表明,Mn-P共掺杂改变了氮化碳的光电性质。通过可见光降解亚甲基蓝(MB)溶液证明了Mn-P共掺杂可以有效改善氮化碳的光催化性能。Mn(2.0%)-P-CN对MB的降解率在120 min内达到62.2%,其速率常数为0.0083 min^-1,是纯氮化碳的2.1倍。同时,探索了Mn-P共掺杂氮化碳的光催化反应机理和循环利用。

Preparation of Mn-P Co-doped Carbon Nitride and Its Photocatalytic Properties

Mn and P co-doped carbon nitride was prepared from manganese chloride tetrahydrate,diammonium hydrogen phosphate and melamine.The prepared catalysts were characterized by X-ray diffraction spectroscopy(XRD),scanning electron microscopy(SEM),fourier transform infrared spectroscopy(FT-IR),photoluminescence spectroscopy(PL),ultraviolet-visible diffuse reflectance spectroscopy(UV-Vis DRS),electrochemical impedance spectroscopy(EIS),and transient photocurrent analytical tests.The results showed that Mn and P co-doping changed the photoelectric properties of carbon nitride,and effectively improve the photocatalytic performance of carbon nitride for degradation of methylene blue(MB)solution under visible light.The degradation rate of MB by Mn(2.0%)-P-CN could reach 62.2%within 120 min,and its degradation rate constant was 0.0083 min^-1,which was about 2.1 times higher than that pure g-C₃N₄.At the same time,the photocatalytic reaction mechanism and recycling of Mn and P co-doped carbon nitride were explored.