Synthesis of highly active crystalline carbon nitride prepared in various salt melts for photocatalytic degradation of phenol

Authors : Mohd Hayrie Mohd HATTA, Hendrik Oktendy LINTANG, Siew Ling LEE, Leny YULIATI

Pages : 63-72

View : 11 | Download : 6

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Crystallinity could have a decisive influence on photocatalytic performance. In this study, the synthesis of crystalline carbon nitride insert ignore into journalissuearticles values(CN); was studied via an ionic melt polycondensation of urea precursor in the presence of various salt melts, which were KCl-LiCl, KCl-NaCl, and KCl-ZnCl$_{2}$. While all the salt melts helped to improve the optical properties of the CN, only KCl-LiCl salt melt could form crystalline CN as evidenced by its X-ray diffraction pattern. Furthermore, the specific surface area of CN insert ignore into journalissuearticles values(72 m$^{2}$/g); was maintained when using KCl-LiCl insert ignore into journalissuearticles values(73 m$^{2}$/g);, but it was decreased in the presence of KCl-NaCl insert ignore into journalissuearticles values(22 m$^{2}$/g); or KCl-ZnCl$_{2}$ insert ignore into journalissuearticles values(17 m$^{2}$/g);. The CN prepared without the salt melt only showed 10% phenol degradation under the light of a solar simulator, while the use of KCl-LiCl significantly improved the activity to 24%. On the other hand, the CN prepared in the presence of KCl-NaCl and KCl-ZnCl$_{2}$ gave phenol degradation of 14% and 7%, respectively. This work demonstrated that the crystallinity, improved absorption in the visible light region, and maintained large specific surface area of the CN were crucial to achieve the high activity.
Keywords : Carbon nitride, crystallinity, KCl LiCl, phenol, salt melt