本文選題：熔鹽輔助微波合成　切入點：石墨相氮化碳　出處：《高等學�；瘜W學報》2017年12期 　論文類型：期刊論文

【摘要】：采用熔鹽輔助微波法制備了可見光下具有優(yōu)越光催化固氮性能的鎳摻雜石墨相氮化碳.采用X射線衍射(XRD)、掃描電鏡(SEM)、氮氣吸附-脫附、紫外-可見光譜(UV-Vis)、X射線光電子能譜(XPS)、熒光光譜(PL)、程序升溫脫附(TPD)和電化學阻抗譜(EIS)等手段對催化劑進行了表征.結果表明,熔鹽輔助微波法使氮化碳催化劑從層狀結構變?yōu)榧{米顆粒狀,并相互緊密堆積形成很多二次孔,增大了催化劑的比表面積.同時,在催化劑制備過程中,熔鹽包裹住了催化劑原料,避免了鎳離子與氧氣的接觸,使鎳離子呈現(xiàn)出活性的Ni(Ⅰ)—N態(tài)和非活性的氧化鎳態(tài)2種存在形式.Ni(Ⅰ)—N作為反應活性中心,能有效捕獲光電子,提高電子-空穴分離效率,促進電子從摻雜鎳離子向N2分子的迅速轉移,實現(xiàn)氮氣分子的活化,進而提高固氮性能.
[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，

本文編號：1639095