Photocatalytic activity of g-C 3 N 4 : An empirical kinetic model, optimization by neuro-genetic approach and identification of intermediates

Photocatalytic and Photoelectrocatalytic Water Splitting by Porous g-C3N4 Nanosheets for Hydrogen Generation

“…Due to the foreseen climate change and energy demand, it is necessary to develop an alternate source of fuel. , For a couple of years, researchers have been working on the development of green and sustainable sources of energy. − Among all the alternative approaches that have been made available in the last two decades, photo/electrocatalytic water splitting to generate hydrogen gas has attracted the most attention. − In the general phenomenon of the photocatalytic water splitting reaction when visible light is irradiated on the surface of the semiconductors (band gap 1.3 eV < E g < 3.1 eV), the electron is excited from the valence band (VB) to the conduction band (CB), where the reduction of H + takes place to form hydrogen gas and holes are generated in the VB which oxidize the water molecule into the hydroxyl ion. − To utilize most of the solar spectrum, it is important that the band gap of the semiconductor lies in the visible region. − g-C 3 N 4 has been shown as a potential candidate, having an optical band gap in the range of 2.7–2.9 eV which lies in the visible region. − However, the nonporous bulk g-C 3 N 4 shows very low photocatalytic activity due to blocked pores, low specific surface area, and high recombination of electron–hole pairs. , …”

Photocatalytic activity enhancement of carbon‐doped g‐C3N4 by synthesis of nanocomposite with Ag2O and α‐Fe2O3

“…The excess number of GAF particles restricts light penetration. [11] Based on Figure 7b, the degradation percentage dropped with increasing initial concentration of AR14. The presumed reason is that the active sites for producing oxidant species are reduced due to the covering of the active sites by dye molecules.…”

“…[6][7][8] Its advantages include good stability, a suitable range of bandgap energy, which is excited by the solar irradiation (i.e., E g = 2.4-2.8 eV), extensive twodimensional (2D) structures, physicochemical and photochemical stability. [9][10][11][12] The advantage of g-C 3 N 4 relative to other graphitic-based semiconductors is the good thermal stability even up to 500 C and high chemical stability against the powerful oxidation reactions. [13,14] Although pristine g-C 3 N 4 can absorb visible-light radiation energy from 400 to 800 nm, it has some limitations such as low surface area, the ineffective removal of the specific contaminants, high electron-hole recombination rate, and insufficient absorption of visible-light energy.…”

Europium-Doped Y2O3-Coated Diatomite Nanomaterials: Hydrothermal Synthesis, Characterization, Optical Study with Enhanced Photocatalytic Performance

“…These outcomes totally introduce the concept of a synergistic impact. As displayed in Figure 11, the graph of (−ln (C/C 0 ) vs. time indicates linear trend for all three sono-photocatalytic, photocatalytic and sonocatalytic processes, displaying pseudo-first-order kinetics [1,44,45]. It is apparent that the pseudo-first-order kinetic constant and degradation ability in sono-photocatalysis (k obs,sono-photo ) are bigger than those for sonocatalysis (k obs,sono ) and photocatalysis (k obs,photo ).…”