Pyrolysis‐Synthesized g‐C₃N₄/Nb₂O₅ Nanocomposite for Enhanced Photocatalytic Activity under White LED Light Irradiation

Abstract

The design and fabrication of highly active visible‐light‐driven photocatalysts have been received considerable attention in recent years. However, individual component‐based photocatalysts are limited in their use because of the high recombination of photoinduced carriers and poor chemical stability. Herein, the Z‐scheme‐originated photocatalytic activity of in‐situ deposited Nb2O5 NPs on the plane surface of carbon nitride (g‐C3N4) nanosheets (i. e. CN‐NbO) heterostructures was studied using a simple thermal pyrolysis method. The as‐synthesized photocatalysts distinctly manifested efficient white light‐emitting diode (LED) light irradiation toward organic malachite green (MG) dye degradation and photocatalytic hydrogen generation. The CN‐NbO heterostructure showed a faster degradation rate of the MG dye and a higher photocatalytic hydrogen evolution rate. In addition, the plausible Z‐scheme photocatalytic mechanism for photocatalytic hydrogen production under LED light irradiation was discussed. Photoelectrochemcial studies showed that the superior photoactivity of CN‐NbO heterostructure is mainly a result of the suitable alignment of the band edge positions, which diminish carrier recombination and facilitate efficient interfacial charge transport at their interface. This study provides an ideal method for in‐situ fabrication of novel two dimensional/one dimension‐based photocatalysts with high activity and stable performance for photocatalytic hydrogen generation.

The improved photocatalytic activity of highly expanded MoS2 under visible light emitting diodes

“…Recently, the usage of an energy-efficient light source such as LED white light attracts greater interest than that of visible light source from the traditional UV lamp or high-power Xenon lamp [11]. Although LED light is more energyefficient, presently there are only few reports on the use of LED white light active photocatalysts such as ZnO 0.6 S 0.4 [12], Ag/AgBr [13], Fe 3+ doped g-C 3 N 4 [14] and g-C 3 N 4 /Nb 2 O 5 [15] for photodegradation of water pollutant. They are capable to photodegrade the organic pollutants within 240 min by 3 -150 W of the visible LED light irradiation.…”

“… 14 ) and g-C 3 N 4 /Nb 2 O 5 (ref. 15 ) for the photodegradation of water pollutants. They are capable of photodegrading organic pollutants within 240 min on irradiation with 3–150 W visible LED light.…”

Boron-Doped Exfoliated g-C3N4 Nanosheet-Based Phosphors for White Light-Emission and Photocatalytic Degradation

“…17 PL wavelength with higher QY was unsuccessful, the majority of these approaches reduced the bandgap of GCN, followed by a red shift of PL wavelength and a sharp reduction of QY, and boosted the light-harvesting potential for photocatalytic degradation. 21,22 Earlier, Dong's team encountered a heteroatom doping method to modify GCN PL emission intensity from the blue to the red region by incorporating thiophene groups. 23 Despite these positive developments, there is still a pressing need to fabricate GCN nanosheets with extended PL wavelengths, high QY, and beneficial properties including low toxicity and strong biocompatibility that will assist with applications.…”

Facile Synthesis of Copper Oxide-Cobalt Oxide/Nitrogen-Doped Carbon (Cu2O-Co3O4/CN) Composite for Efficient Water Splitting

“…Researchers are exploring other options, such as nitrides, phosphides, selenides, and carbides [21,22]. These types of non-nobel metal catalysts show high corrosion resistance and better electroconductivity [23][24][25][26][27][28]. Some highly efficient catalysts recently reported for HER are CoS 2 , FeS 2 , MoSe 2 , g-C 3 N 4 /Co-MOF (ZIF-67), g-C 3 N 4 /Nb 2 O 5 , CdS QD/MoO 3 -OV/g-C 3 N 4 , and NiS 2 [1][2][3][4].…”