Template-free preparation and properties of mesoporous g-C₃N₄/TiO₂nanocomposite photocatalyst

Abstract

A facile template-free method was proposed to fabricate a novel network structured mesoporous g-C3N4/TiO2 nano-heterojunction composite via protonation of base functionalities during the in situ growth of TiO2 nanoparticles on the surface of g-C3N4 under hydrothermal conditions.

Influence of TiO2 morphology on the photocatalytic efficiency of direct Z-scheme g-C3N4/TiO2 photocatalysts for isoniazid degradation

“…Consequently, TiO 2 with different morphologies, such as nanoparticles, nanofibers, nanosheets, and nanobelts, have been used in CN hybrid systems [18][19][20][27][28][29]. However, these result in heterojunction-type transfer mechanisms.…”

“…Nevertheless, CN has low photocatalytic efficiency because of the short lifetimes of its photogenerated electrons and holes. Subsequently, CN/TiO 2 heterojunction photocatalysts have been developed to simultaneously prolong the charge carrier lifetimes in CN and improve the visible light response of TiO 2 [18][19][20]. In heterojunction the accumulated holes in the valence band (VB) of CN cannot oxidize the surface hydroxyl (-OH) groups to hydroxyl radicals ( • OH), because the VB position of CN has a lower positive potential (+1.575 eV) than that required for the oxidation of -OH groups (-OH/ • OH = +2.4 eV).…”

Can environmental pharmaceuticals be photocatalytically degraded and completely mineralized in water using g-C3N4/TiO2 under visible light irradiation?—Implications of persistent toxic intermediates

“…Among these abundant g-C 3 N 4 -based photocatalysts, g-C 3 N 4 /TiO 2 has been frequently constructed because of its enhancement of electron hole separations and subsequent high photocatalytic activity [26,27]. Nevertheless, most of these works had mainly focused on using g-C 3 N 4 /TiO 2 composite as a catalyst under visible light irradiation to produce H 2 [28,29] or to degrade common organics, such as dye [30][31][32], phenol [33,34], formaldehyde [35], or dibenzothiphene [36].…”

Microwave-enhanced Fenton-like degradation by surface-modified metal--organic frameworks as a promising method for removal of dye from aqueous samples

“…22,23 However, due to some problems such as limited specific surface area and poor quantum efficiency, nanomaterials have low adsorption as well as degradation capacity, which must be solved for extending their application. 24 NPs, MIL-100(Fe) and Fe 3 O 4 @MIL-100(Fe), of our previous study. 44 As demonstrated, the XRD pattern of show that two-step weight loss occurs in the temperature region of 300-850 K. The first one (about 14.0 wt.%) was observed from 320 to 380 K, which could be assigned to the loss of the residual or absorbed water.…”