原位复合法制备Ag@g-C_(3)N_(4)复合多孔微球及光催化性能研究  

In situ compounding preparation of Ag@g-C_(3)N_(4) porous microspheres and their photocatalytic properties

作　　者：钱慧锦 赵卫峰 李娇娇 张改[1] 马爱洁[1] 周宏伟[1] 陈卫星[1] QIAN Huijin;ZHAO Weifeng;LI Jiaojiao;ZHANG Gai;MA Aijie;ZHOU Hongwei;CHEN Weixing(School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China)

机构地区：[1]西安工业大学材料与化工学院,西安710021

出　　处：《功能材料》2022年第4期4166-4172,共7页Journal of Functional Materials

基　　金：国家自然科学基金项目(61604120);陕西省自然科学基金项目(2019JM-527,2019JM-124)。

摘　　要：利用三聚氰胺(Melamine)和三聚氰酸(Cyanuric acid)分子间的氢键相互作用,在DMSO溶液中进行自组装制备球形超分子组装体(MCA),然后将MCA与AgNO_(3)复合,再进一步高温煅烧制备Ag@g-C_(3)N_(4)异质耦合复合多孔微球(Ag-MCA-CN)。利用傅里叶变换红外光谱(FT-IR)、X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、紫外-可见光漫反射(UV-vis DRS)光谱和荧光发射光谱(PL)等对等对样品进行了表征。以甲基橙(MO)为目标污染物,在可见光照射下,考察了Ag-MCA-CN复合光催化剂的光催化活性。结果表明,与MCA直接煅烧得到纯g-C_(3)N_(4)多孔微球(MCA-CN)相比,Ag-MCA-CN比表面积进一步增大,禁带宽度减小,具有更强的紫外及可见光吸收性能,光生电子和空穴复合率降低,光催化活性明显增强。Ag-MCA-CN比表面积可达到74.8 m^(2)/g,在可见光照射下25 min内对MO的降解率可达98%,降解速率常数k约为MCA-CN的2.9倍。Sphere-shaped supramolecular aggregates of melamine and cyanuric acid complex(MCA)are prepared by self-assembly of them via hydrogen bond interaction in DMSO solution.Then MCA are compounded with AgNO_(3) and calcined at high temperature to prepare Ag@g-C_(3)N_(4) heterocoupling porous microsphere composites(Ag-MCA-CN).The samples are characterized by Fourier transform infrared spectroscopy(FT-IR),X-ray powder diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),ultraviolet visible diffuse reflectance(UV-vis DRS)and fluorescence spectra(PL).The photocatalytic activity of Ag-MCA-CN composite photocatalyst is investigated under visible light irradiation by employing methyl orange(MO)as the target pollutant.The results show that compared with the pure g-C_(3)N_(4) porous microspheres(MCA-CN)obtained by direct calcination of MCA,Ag-MCA-CN has further increased specific surface area,reduced band gap,stronger UV and visible light absorption properties,reduced recombination rate of photogenerated electrons and holes,and significantly enhanced photocatalytic activity.The surface area of Ag-MCA-CN can reach 74.8 m^(2)/g,the degradation rate of MO can reach 98%within 25 min under visible light irradiation,and the degradation rate constant is about 2.9 times that of MCA-CN.

关 键 词：石墨相氮化碳 AG掺杂 多孔微球 光催化 

分 类 号：TB33[一般工业技术—材料科学与工程] TB34