Na掺杂g-C_(3)N_(4)纳米管的合成及其光催化性能  

Synthesis and Photocatalytic Properties of Na Doped g-C_(3)N_(4) Nanotubes

作　　者：于富成[1] 李圆梦 刘正艳 崔军鹏 周亚东 Yu Fucheng;Li Yuanmeng;Liu Zhengyan;Cui Junpeng;Zhou Yadong(School of Material Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050

出　　处：《稀有金属》2022年第7期896-905,共10页Chinese Journal of Rare Metals

基　　金：湖北省教育厅委托科技项目(B2018058);企事业单位委托科技项目(LZSN-KJ-002,2018040-G,ky2019047)资助。

摘　　要：以三聚氰胺和三聚氰酸作为前驱体,将三聚氰胺和三聚氰酸的混合悬浮液通过水热反应生成超分子中间体(MCA),然后经煅烧中间体合成g-C_(3)N_(4)纳米管,最后再采用热处理向g-C_(3)N_(4)纳米管中引入Na元素,获得了Na掺杂g-C_(3)N_(4)纳米管。采用X射线衍射(XRD)、场发射扫描电镜(SEM)、能量色散X射线光谱(EDXS)、傅里叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)、紫外-可见漫反射(UV-Vis DRS)和光致发光(PL)对系列试样进行表征,以苯酚(Phenol)溶液为降解对象,研究了试样的光催化性能。研究表明,通过水热、煅烧和热处理过程制备的Na掺杂g-C_(3)N_(4)纳米管,不仅提升了光的吸收能力,而且使g-C_(3)N_(4)的本征吸收边红移,拓宽了其可见光的吸收范围,增强了对可见光的吸收率,从而提高了太阳光的利用率。另外,Na掺杂能够提供更多的载流子并延长载流子寿命,提高了光生载流子的分离效率。且当Na掺杂质量比为17.5%时,试样在120 min内对Phenol的降解效率达到74.7%,分别是试样CN和NC_(0)的5.05倍和2.15倍。With the development of industrial technology,the environmental problems have become more and more serious,especial⁃ly water pollution,which will directly endanger human health.Semiconductor photocatalysis technology is a kind of solar energy driven material to degrade the pollutants in the environment by strong redox ability.However,the traditional photocatalytic materials have some disadvantages,such as small specific surface area,low visible light utilization and high recombination rate of photo-generated electrons and holes,which lead to the low photocatalytic efficiency.Therefore,it is necessary to modify the morphology and band structure of semiconductor photocatalysts to improve their photocatalytic performance.g-C_(3)N_(4)nanotubes with different Na doping con⁃centrations were prepared by hydrothermal,calcination and heat treatment methods.Firstly,a suspension mixture of melamine and cy⁃anuric acid was used as precursor and placed to an autoclave at 150℃for 20 h.After cooling to room temperature,a supramolecular intermediate(MCA)was obtained.Secondly,MCA powder was transferred into an alumina crucible,calcined in a muffle furnace at 520℃for 2 h.After cooling down to room temperature,g-C_(3)N_(4)nanotubes were obtained.g-C_(3)N_(4)nanotubes were dispersed in a NaNO_(3) solution for Na element doping,followed by a drying process at 70℃.Then the dried powder was placed in a crucible and heat treated in a muffle furnace at 520℃for 2 h.Then Na doped g-C_(3)N_(4)nanotubes were obtained.The phase composition,morphology and optical properties of the obtained samples were characterized by an X-ray diffraction(XRD),field emission scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDXS),Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spec⁃troscopy(XPS),ultraviolet and visible diffuse reflectance spectrophotometer(UV-Vis DRS)and photoluminescence(PL).In addi⁃tion,the photocatalytic performance of the sample was evaluated by the degradation of a phenol solution.A

关 键 词：水热法 煅烧法 Na掺杂g-C_(3)N_(4)纳米管 光催化 

分 类 号：TB34[一般工业技术—材料科学与工程]