Band gap-tunable potassium doped graphitic carbon nitride with enhanced mineralization ability. Issue 3 (20th November 2014)

• Record Type: Journal Article
• Authors: Hu, Shaozheng; Li, Fayun; Fan, Zhiping; Wang, Fei; Zhao, Yanfeng; Lv, Zhenbo
• Is Part Of: Dalton transactions. Volume 44:Issue 3(2015)
• Page Start: 1084
• Page End: 1092
• Publication Date: 2014-11-20
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c4dt02658f
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Potassium doped into the g-C3 N4 crystal lattice can tune the positions of the CB and VB potentials, influence the structural and optical properties and thus improve the photocatalytic degradation and mineralization ability. Abstract : Band gap-tunable potassium doped graphitic carbon nitride with enhanced mineralization ability was prepared using dicyandiamide monomer and potassium hydrate as precursors. X-ray diffraction (XRD), N2 adsorption, UV-Vis spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), photoluminescence (PL) and X-ray photoelectron spectroscopy (XPS) were used to characterize the prepared catalysts. The CB and VB potentials of graphitic carbon nitride could be tuned from −1.09 and +1.56 eV to −0.31 and +2.21 eV by controlling the K concentration. Besides, the addition of potassium inhibited the crystal growth of graphitic carbon nitride, enhanced the surface area and increased the separation rate for photogenerated electrons and holes. The visible-light-driven Rhodamine B (RhB) photodegradation and mineralization performances were significantly improved after potassium doping. A possible influence mechanism of the potassium concentration on the photocatalytic performance was proposed.