【摘要】 通过混合煅烧二氰二胺水热法和三聚氰胺-三聚氰酸共沉淀法制备的超分子前驱体，制备了兼具多孔纳米片和中空纳米管形貌的g-C₃N₄/g-C₃N₄同质结（CN-HP）。通过X射线衍射（XRD）、扫描电镜（SEM）、透射电镜（TEM）、紫外-可见漫反射光谱（UV-Vis DRS）、光致发光光谱（PL）等对光催化剂进行了表征。结果表明，CN-HP-1/1在75 min内对亚甲基蓝（MB）的降解率可达99.8%，伪一级动力学常数为4.02 h-1，是块体g-C₃N₄的5倍，同时单位比表面积的反应常数提升至单体的1.8倍。PL测试表明，合适比例的三聚氰胺-三聚氰酸（MCA-H、MCA-P）超分子制备的同质结，其光生电子-空穴复合率较单体g-C₃N₄进一步降低。自由基捕获实验表明，光生空穴是光催化降解过程中的主要活性物种，并结合X射线光电子能谱价带谱测试提出了Z型电子传输机制。更多还原

【Abstract】 g-C₃N₄/g-C₃N₄ homojunction（CN-HP） with the morphology of porous nanosheets and hollow nanotubes was prepared from supramolecular precursor prepared by mixed calcination of dicyanodiamine hydrothermal method and melaminecyanuric acid coprecipitation method.The photocatalyst was characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,ultraviolet-visible diffuse reflectance（UV-Vis DRS）,photoluminescence spectroscopy（PL）,etc.The results showed that CN-HP-1/1 exhibited a degradation rate of 99.8% for methylene blue（MB） within 75 min,and the pseudo first-order kinetic constant was 4.02 h-1,which was 5 times that of bulk g-C₃N₄.And the reaction constant per unit specific surface area was increased to 1.8 times that of monomeric g-C₃N₄.The PL test showed that the photogenerated electron-hole recombination rate of the homojunction prepared by the appropriate ratio of MCA was lower than that of the monomer g-C₃N₄.Free radical capture experiments showed that photo-generated holes were the main active species in the photocatalytic degradation process.Combined with XPS valence band spectroscopy tests,it was proposed that the homojunction photocatalysts had a Z-scheme electron transport mechanism.更多还原