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TEM image of BCN (A) and ECN (B), and STEM of ECN (C) and the corresponding EDS element mapping images of C (D), N (E), and O elementals (F)
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Graphitic carbon nitride (g-C3N4) has received much interest as a visible-light-driven photocatalyst for degrading pollutants such as organic dyes and antibiotics. However, g-C3N4 bulk activity could not meet expectations due to its rapid recombination of photogenerated electron–hole pairs and low specific surface area. In our study, melamine was t...
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Citations
... gCN NS were prepared by one-step exfoliation method [50] where melamine (2 g) was mixed with NH 4 Cl (10 g) and the resultant mixture was heated at 550 • C for 4 h, in ambient atmosphere. The procedure resulted in the formation of exfoliated gCN NS which were directly used for loading CoB co-catalysts. ...
Despite being one of the most widely studied metal-free semiconductors, graphitic carbon-nitride (gC 3 N 4) shows meaningful photocatalytic activities only when loaded with noble-metal co-catalysts. The present work reports an alternative to noble metals in the form of cobalt boride (CoB) co-catalyst that can be easily integrated within the gC 3 N 4 framework with facile fabrication strategies. The optimized CoB-gC 3 N 4 composite showed ~60 times higher hydrogen generation rate compared to bare gC 3 N 4 nanosheets, with good stability. Detailed morphological , structural, chemical, electrochemical and spectroscopic investigations revealed the key aspects of CoB-gC 3 N 4 composite that unanimously led to higher photocatalytic activity. Computational investigations not only corroborated the experimental results but also established that the surface Co and B sites in CoB provided the most energetically favoured sites for hydrogen evolution reaction. Based on the experimental and computational investigations, a generic reaction mechanism was formulated that will prove as a guiding light for future studies on similar photocatalytic systems.
... The organic contaminants in water has expanded as a result of fast industrial development, which in turn led to the emergence of main global crises, including environmental pollution and biodiversity loss [1,2]. It has become necessary to degrade organic pollutants by using environmentally friendly and mild conditions, photocatalysis, which does not generate secondary contamination, and has become the focus of many researchers in this field [3,4]. A lot of visible light-driven photocatalysts have been established [5]. ...
... The charges transmission pathway in the g-C 3 N 4 /MnWO 4 /NiS is reliable with that of triple characteristic heterojunction (Scheme 2S(A)). g-C 3 ...
Assembling of a new ternary heterojunction (g-C3N4/MnWO4/NiS) is reported here. As a result, the g-C3N4/MnWO4/NiS exhibited numerous benefits, such as outstanding visible light absorption, high carrier separation, and therefore, boosted photodegradation performance (96.7% of methylene blue, MB) compared to g-C3N4, and MnWO4. The contact region between g-C3N4 and MnWO4 efficiently accomplishes rapid separation of charge carriers through NiS cocatalyst, creating binding sites between g-C3N4 and MnWO4 semiconductors. The mechanisms for the photocatalytic degradation over the g-C3N4/MnWO4/NiS heterostructure are suggested and verified.
In photocatalytic anticorrosion perspective, the migration rate of excited electrons from surface layers to substrate steels restricted the performance of g‐C3N4 due to the high resistance between interface of g‐C3N4 layers and adhesive layers. Herein, an S‐scheme g‐C3N4/polyaniline (PANI) heterojunction with face‐to‐face structure was established by a secondary calcining method. The as‐prepared heterojunctions were applied to protect Q235 carbon steel, and the results showed that the anticorrosion performance of S‐scheme g‐C3N4/PANI heterojunction is much higher than that of g‐C3N4 and PANI coating layers according to salt spray test. Photocurrent intensity indicated that the optimum amounts of g‐C3N4 and PANI were 0.06 and 0.09 mL/cm², which are benefit for the transport of excited electrons due to the optimum thickness of coating layers. Furthermore, the S‐scheme g‐C3N4/PANI heterojunction can promote the separation rate of charge carriers and suppress the recombination rate at the same time, which are inferred from photocurrent intensity, electrochemical impedance spectra, super‐depth‐of‐field microscope, and photoluminescence investigation. In the last, the enhanced anticorrosion performance of S‐scheme g‐C3N4/PANI heterojunction with face‐to‐face structure was deduced according to mentioned characterization.
BiVO4 and g‐C3N4 have gain attention for their potential in sustainable energy and environmental applications due to their visible light absorption properties. However, their limitations in terms of visible light absorption and electron‐hole separation have prompted efforts to enhance their energy utilization and reduce electron‐hole recombination. In our study, we investigated the fabrication of a ternary Ag/g‐C3N4/BiVO4 composite for Rhodamine B (RhB) degradation under visible light irradiation using a combination of photo‐deposition and calcination methods. Our findings demonstrate that the Ag/g‐C3N4/BiVO4 outperforms g‐C3N4, BiVO4, and g‐C3N4/BiVO4 in terms of RhB degradation rate. This improvement can be attributed to the improved light absorption and synergetic effects on charge transfer and photoelectron‐hole recombination resulting from the incorporation of Ag into the ternary system. This ternary Ag/g‐C3N4/BiVO4 composite has potential as a photocatalyst for the removal of organic pollutants due to its reasonable design and superior effectiveness.
