铈掺杂石墨相氮化碳的合成及可见光光催化性能

发布时间：2018-01-04 03:48

本文关键词：铈掺杂石墨相氮化碳的合成及可见光光催化性能　出处：《高等学校化学学报》2016年11期 　论文类型：期刊论文

【摘要】：以硝酸铈和三聚氰胺为原料,采用热解法合成系列Ce掺杂石墨相氮化碳(g-C_3N_4).采用X射线衍射仪(XRD)、透射电子显微镜(TEM)、傅里叶变换红外光谱仪(FTIR)、紫外-可见漫反射光谱仪(UV-Vis DRS)、荧光光谱仪(PL)和X射线光电子能谱仪(XPS)等对样品进行了表征.结果表明,Ce掺杂使g-C_3N_4晶粒尺寸减小,比表面积增大,光生电子/空穴对复合几率降低,并影响到能带结构.在可见光下光催化降解亚甲基蓝水溶液的结果表明,Ce掺杂g-C_3N_4的可见光光催化活性远优于纯g-C_3N_4.其中,0.10-Ce-C_3N_4样品80 min内对亚甲基蓝的降解率高达98.51%,速率常数达0.0506 min~(-1),是纯g-C_3N_4的4.9倍.
[Abstract]:Using cerium nitrate and melamine as raw materials, a series of ce doped graphite phase carbon nitride and C _ 3N _ 4 were synthesized by pyrolysis. X-ray diffractometer (XRDX) and transmission electron microscope (TEM) were used. Fourier transform Infrared Spectrometer (FTIR), UV-Vis DRS (UV-Vis DRS). The samples were characterized by fluorescence spectrometer (PL) and X-ray photoelectron spectroscopy (XPS). The results show that ce doping decreases the grain size and increases the specific surface area of g-C3N4. The photoelectron / hole pair recombination probability is decreased and the band structure is affected. The photocatalytic degradation of methylene blue aqueous solution under visible light shows that. The visible photocatalytic activity of ce doped g-C _ 3N _ 4 is much better than that of pure g-C _ 3N _ s _ 4. The degradation rate of methylene blue was 98.51% and the rate constant was 0.0506 min ~ (-1) in the sample of 0.10-Ce-C3N _ (4) in 80 min. It is 4.9 times that of pure g-C _ 3N _ S _ 4.
【作者单位】：暨南大学生命科学技术学院化学系;
【基金】：暨南大学“挑战杯”项目(批准号:141212034);暨南大学大学生创新创业训练计划项目(批准号:CX15090)资助~~
【分类号】：O643.36
【正文快照】： 半导体光催化技术在解决能源短缺和环境污染等方面表现出巨大的潜力,是当今的研究热点[1].在诸多半导体光催化剂中,石墨相氮化碳(g-C3N4)具有良好的可见光响应(带隙2.7 e V)性质,可直接利用太阳能[2,3].然而,g-C3N4光生载流子寿命短、易复合的缺点限制了其进一步应用.针对这一

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