In situ synthesis of C₃N₄/Bi₂S₃ composites with enhanced photocatalytic degradation performance under visible light irradiation

Abstract

Carbon nitride/bismuth sulfide (C3N4/Bi2S3) nanocomposites were prepared by a facile one‐step in situ calcination method using ammonium thiocyanate and bismuth chloride as reagents. The crystal structure, composition, and morphology of the nanocomposites were characterized by X‐ray diffraction (XRD), Fourier transform infrared (FT‐IR) spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The photocatalytic degradation of rhodamine B (RhB) was carried out to evaluate the photocatalytic activity of the nanocomposites under visible light irradiation. The as‐prepared C3N4/Bi2S3 nanocomposites displayed enhanced visible light absorption. These photocatalysts exhibited superior photodegradation performance under visible light irradiation compared to pure C3N4. Meanwhile, the C3N4/Bi2S3 nanocomposites exhibited remarkably stable photocatalytic efficiency after five cycles of photodegradation of RhB. The C3N4/Bi2S3 heterostructure improved the separation and transfer efficiency of the photogenerated electron–hole pairs. It played an important role for the enhanced photocatalytic performance of the nanocomposite photocatalysts.

Accelerated separation of photogenerated charge carriers and enhanced photocatalytic performance of g-C3N4 by Bi2S3 nanoparticles

“…The final product includes g-C3N4/Bi2S3 and Bi. Yin et al [52] reported another method to prepare g-C3N4/Bi2S3 composite materials, through calcining the mixture of ammonium thiocyanate (NH4SCN) and bismuth chloride (BiCl3) at 550 °C in nitrogen atmosphere. In addition, the potential mechanisms for the enhanced photocatalytic activity of g-C3N4/Bi2S3 heterojunctions in these previous studies remained unclear or even contradictory.…”

ompg-C3N4/SO3H organocatalyst-mediated green synthesis of 1,2-dihydro-1-arylnaphtho[1,2-e][1,3] oxazin-3-ones under solvent-free and mild conditions: a fast and facile one-pot three-component approach

“…For evaluation of the solvent effect, the model reaction was investigated by applying various solvents (including EtOH, H 2 O, MeOH, CH 3 CN, toluene) and in solvent-free conditions (Table 1, entries [8][9][10][11][12].The results revealed that, in the presence of both types of protic and aprotic solvents, only a trace amount of product was obtained and the best result was achieved in the absence of solvent. In continuance, the influence of temperature was investigated (Table 1, entries [13][14][15][16][17]. Relying on the obtained results, as the temperature was conducted to 100 °C, the desired product was formed at a shorter reaction time and the yield increased to 87% (Table 1, entry 17).…”

“…Generally, g-C 3 N 4 substructure, based on aromatic C-N heterocycles and optimized van der Waals forces between its two-dimensional conjugated planes, can be prepared by polymerization of affordable nitrogen-containing materials like melamine, urea, cyanamide, thiourea, and dicyandiamide [6]. Reasonable physical and chemical property, unique electronic property, exclusive thermal and chemical resistance, and high specific surface area [7] make this material be applied in many scientific fields such as fuel cell [8], sensor [9], solar cell [10], metal-free catalyst [11], heterogeneous photocatalyst [12], energy storage [13], oxygen reduction reaction (ORR) [14], hydrogen evolution [15], photocatalytic degradation of pollutants [16,17], and oxidation [18]. The preparation of wellordered mesoporous g-C 3 N 4 leads to higher specific surface area, stronger adsorption capacity, and larger pore volume and increases active chemical sites, thereby enhancing the performance of g-C 3 N 4 as an efficient catalyst and catalyst support [19,20].…”

Investigation of BiVO4 structure variations on the dichlorotoluene ammoxidation performance

“…[12][13][14] In addition, Bi-based catalysts have been widely synthesized and studied. [15][16][17][18][19] However, studies on analyzing the correlations between structure variations of BiVO 4 and catalytic activities have not been reported.…”

“…Recently, bismuth vanadate oxides (BiVO 4 ) have been reported to show high catalytic performance among the mental oxide catalysts for the ammoxidation of methyl aromatics or heteroaromatics to nitriles 12–14 . In addition, Bi‐based catalysts have been widely synthesized and studied 15–19 . However, studies on analyzing the correlations between structure variations of BiVO 4 and catalytic activities have not been reported.…”