镍掺杂石墨相氮化碳的熔盐辅助微波法制备及光催化固氮性能

发布时间：2018-03-20 12:27

  本文选题：熔盐辅助微波合成　切入点：石墨相氮化碳　出处：《高等学校化学学报》2017年12期 　论文类型：期刊论文

【摘要】：采用熔盐辅助微波法制备了可见光下具有优越光催化固氮性能的镍掺杂石墨相氮化碳.采用X射线衍射(XRD)、扫描电镜(SEM)、氮气吸附-脱附、紫外-可见光谱(UV-Vis)、X射线光电子能谱(XPS)、荧光光谱(PL)、程序升温脱附(TPD)和电化学阻抗谱(EIS)等手段对催化剂进行了表征.结果表明,熔盐辅助微波法使氮化碳催化剂从层状结构变为纳米颗粒状,并相互紧密堆积形成很多二次孔,增大了催化剂的比表面积.同时,在催化剂制备过程中,熔盐包裹住了催化剂原料,避免了镍离子与氧气的接触,使镍离子呈现出活性的Ni(Ⅰ)—N态和非活性的氧化镍态2种存在形式.Ni(Ⅰ)—N作为反应活性中心,能有效捕获光电子,提高电子-空穴分离效率,促进电子从掺杂镍离子向N2分子的迅速转移,实现氮气分子的活化,进而提高固氮性能.
[Abstract]:The Ni-doped graphite phase nitride carbon with excellent photocatalytic nitrogen-fixing performance under visible light was prepared by molten salt-assisted microwave method. X ray diffraction (XRD), scanning electron microscopy (SEM), adsorption and desorption of nitrogen were used. The catalysts were characterized by UV-Vis-Vis X-ray photoelectron spectroscopy (XPS), fluorescence spectra (PL), temperature programmed desorption (TPD) and electrochemical impedance spectroscopy (EIS). The molten salt assisted microwave method changed the carbon nitride catalyst from layered structure to nanocrystalline structure, and formed many secondary pores, which increased the specific surface area of the catalyst. The molten salt encapsulates the catalyst material, avoids the contact between nickel ion and oxygen, and makes nickel ion present two existing forms: active Ni (鈪，

本文编号：1639095