Effect of template-induced surface species on electronic structure and photocatalytic activity of g-C3N4

Abstract

1In view of the fact that the photocatalytic activity of graphitic carbon nitride (g-C 3 N 4 ) 2 is greatly influenced by its electronic structure, herein, effect of templates induced 3 surface species variation on the electronic structure and photocatalytic activity of the 4 templated g-C 3 N 4 was investigated. By mixing the precursor of cyanamide with 5 different templates (SiO 2 , Al 2 O 3 and template-free) in the preparation of graphitic 6 carbon nitride (g-C 3 N 4 ), carbon nitrides with different surface species were obtained. 7 The obtained carbon nitride (g-C 3 N 4 -Si) templated by SiO 2 nanoparticles exhibits 8 enlarged band gap (3.26 eV) and enhanced photo-degradation ability towards Methyl 9

A Mesoporous Rod-like g-C3N5 Synthesized by Salt-Guided Strategy: As a Superior Photocatalyst for Degradation of Organic Pollutant

“…Under visible light irradiation, electrons of g-C 3 N 5 -M are more easily excited from the VB to the CB compared to pristine g-C 3 N 5 and a corresponding lot of holes are formed in the VB. The •O 2 – and •OH in the photocatalysis are mainly generated as the following pathways: , The electrons in the CB of RN-g-C 3 N 5 react with O 2 to generate superoxide radicals (•O 2 – ), and the hole on the VB can oxidize H 2 O to form hydroxyl radicals (•OH), which subsequently degrade the MB dye. − These excited charge carriers, as highly reactive species with robust reducing and oxidizing capacities, degrade the MB dye under visible light.…”

Efficient Transfer Hydrogenation of Nitro Compounds to Amines Enabled by Mesoporous N-Stabilized Co-Zn/C

“…The presence of graphic N can find a clue from the formed graphene structure, as verified by TEM (Figure 2). Also, the XPS spectra of C 1s (shown in Figure S3) show three peaks at 284.6, 285.8, and 288.6 eV, illustrating the existence of C = C/C-C, C-N, and N = C-N bonds in the materials, respectively (Shen et al, 2017; Zhao et al, 2017). In addition, the existence of the Zn element in fresh Co-Zn/N-C-800 and even the one reused for five times was affirmed by the XPS spectra of Zn 2p peak (Figure 4), which is consistent with ICP analysis (ca.…”

Perovskite Structure Associated with Precious Metals: Influence on Heterogenous Catalytic Process

“…In the photoactivation of the semiconductor, electrons located in the valence band maximum (VBM) are photoexcited under hν ≥ E g toward conduction band minimum (CBM) leaving positive holes in the valence band. Subsequently, these charge carriers may have different destinations in the photocatalytic process [23,25,[31][32][33][34][35]. A photocatalyst will oxidize a species upon a less positive oxidation potential (E ox ) than the potential edge conduction band (CBM) and analogously reduces it upon a more positive reduction potential (E red ) than the potential edge valence band (VBM) [36].…”

“…A photocatalyst will oxidize a species upon a less positive oxidation potential (E ox ) than the potential edge conduction band (CBM) and analogously reduces it upon a more positive reduction potential (E red ) than the potential edge valence band (VBM) [36]. Thus, the positions of the electronic band-edge structures of the semiconductor can easily promote both oxidation and reduction of the species presents in solution since the valence/conduction band gap (E g ) is sufficiently large for encompassing the redox potentials of some species that are essential to the photocatalytic process [25,[33][34][35][36][37].…”