木耳状g-C3N4的合成

Preparation of Fungus-like g-C3N4

以三聚氰胺、三聚氯氰为原料,550℃热聚合法制备了g-C3N4(FCN)。13CNMR、XRD证明该g-C3N4的结构单元是3-s-三嗪环,电镜照片显示FCN形貌为木耳状,边缘较厚。原料三聚氯氰、三聚氰胺分别是4g和2g时,N2吸附-脱附测定FCN1的比表面积为156.25m2/g,孔径60nm。UV-Vis漫反射测试FCN1的吸收边缘为482nm,对应禁带宽度2.57eV,PL光谱显示FCN1光致发光强度最弱。可见光照射下,30mgFCN1加入30mL(30mg/L)的罗丹明B(RhB)溶液中,50min后RhB的光降解率是99.62%,光催化剂循环实验表明该木耳状g-C3N4具有良好的稳定性。

The fungus-like g-C3N4(FCN)was prepared by thermal polymerization of cyanuric chloride,melamine and deionized water at 550℃.The tris-s-triazine units in FCN were confirmed by 13CNMR and XRD.The surface morphology of FCN was similar to a white fungus and the crimped edge was thicker.The surface area and pore size of FCN1 was 156.25 m2/g and 60 nm by N2 adsorption-desorption using 4 g cyanuric chloride and 2 g melamine as material.UV-visible diffuse reflectance spectrum(DRS)showed that FCN1 had band edge at ca.482 nm corresponding to 2.57 eV.PL spectra showed that the photoluminescence intensity of FCN1 was the weakest in several materials.When 30 mg FCN1 was added in 30 mL Rhodamine B solution(30 mg/L),the decomposition rate of RhB was 99.62%after 50 min under the visible-light irradiation.The results of photocatalyst repeated experiment showed that FCN1 had good stability.