Topic
Photocatalysis
About: Photocatalysis is a research topic. Over the lifetime, 67088 publications have been published within this topic receiving 2145233 citations. The topic is also known as: photocatalyst.
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TL;DR: In this paper, the transformation process of the Mo species loaded on CdS, together with the junctions formed between MoS2 and cdS was clearly demonstrated with X-ray photoelectron spectroscopy and transmission electron microscopy.
Abstract: Photocatalytic H2 production on MoS2/CdS photocatalysts in the presence of different sacrificial reagents under visible light (λ > 420 nm) has been investigated. The transformation process of the Mo species loaded on CdS, together with the junctions formed between MoS2 and CdS, was clearly demonstrated with X-ray photoelectron spectroscopy and transmission electron microscopy. Photocatalytic H2 evolution was optimized for MoS2/CdS catalysts. The 0.2 wt % MoS2/CdS catalyst calcined at 573 K achieves the highest overall activity for H2 evolution, and the 0.2 wt % MoS2/CdS catalyst demonstrates even higher activity than the 0.2 wt % Pt/CdS, irrespective of different sacrificial reagents used. The junctions formed between MoS2 and CdS play an important role in enhancing the photocatalytic activity of MoS2/CdS catalysts. Electrochemical measurements indicate that MoS2 is an excellent H2 evolution catalyst, which is another very important factor responsible for the enhancement of the photocatalytic activity of ...
369 citations
TL;DR: In this paper, the mechanism of photocatalytic decomposition of H2O into H2 and O2 over NiO and SrTiO3 powder was studied on the basis of the structure of the catalyst.
369 citations
TL;DR: It was demonstrated that the SnO( 2) nanorods would change their preferential growth direction on the varied alpha-Fe(2)O(3) precursors with distinct crystallographic surface, driven by decrease in the distortion energy induced by lattice mismatch at the interfaces.
Abstract: Branched SnO2/α-Fe2O3 semiconductor nanoheterostructures (SNHs) of high purity were synthesized by a low-cost and environmentally friendly hydrothermal strategy, through crystallographic-oriented epitaxial growth of the SnO2 nanorods onto the α-Fe2O3 nanospindles and nanocubes, respectively. It was demonstrated that the SnO2 nanorods would change their preferential growth direction on the varied α-Fe2O3 precursors with distinct crystallographic surface, driven by decrease in the distortion energy induced by lattice mismatch at the interfaces. All of the prepared SNHs were of high purity, ascribing to the successful preinhibition of the SnO2 homonucleation in the reaction system. Significantly, some of the SnO2/α-Fe2O3 SNHs exhibited excellent visible light or UV photocatalytic abilities, remarkably superior to their α-Fe2O3 precursors, mainly owing to the effective electron−hole separation at the SnO2/α-Fe2O3 interfaces.
369 citations
TL;DR: In this article, a novel one-step ionic liquid induced strategy has been reported for the controlled synthesis of carbon quantum dots (CQDs)/BiOX (X = Br, Cl) hybrid nanosheets with tunable CQDs loading contents.
Abstract: A novel one-step ionic liquid induced strategy has been reported for the controlled synthesis of carbon quantum dots (CQDs)/BiOX (X = Br, Cl) hybrid nanosheets with tunable CQDs loading contents. Such synthetic process allows the CQDs well dispersed on the surface of BiOX nanosheets. Three different types of pollutants, such as phenol rhodamine B (RhB), antibacterial agent ciprofloxacin (CIP) and endocrine disrupting chemical bisphenol A (BPA) were chosen to evaluate the photocatalytic activity of CQDs/BiOX composite nanosheets. They show very interesting CQDs loading content and X composition-dependent photocatalytic activity with 3 wt% CQDs/BiOBr nanosheets showing the highest photocatalytic activity (much better than pure BiOBr nanosheets) for the degradation of RhB, CIP and BPA under visible light irradiation. The results reveal that there are three factors in promoting the photocatalysis of 3 wt% CQD/BiOBr nanosheets: high visible light absorbance, high separation efficiency of photo-induced electrons and holes and lower resistance. The active species trap experiments and electron spin resonance (ESR) reveal that during the photocatalytic process, hole and O2 − become the dominant species for the degradation of pollutants. The unique strategy demonstrated here can be extended to other hybrid nanosheet systems, making it possible to design and tune advanced photocatalysts for other important chemical and catalytic reactions.
368 citations
TL;DR: C 60 modified graphitic carbon nitride (g-C 3 N 4 ) composite photocatalysts were prepared by a facile thermal treatment at 550°C in atmosphere involving polymerization of dicyandiamide in the presence of C 60 without adding any other reagent as discussed by the authors.
Abstract: C 60 modified graphitic carbon nitride (g-C 3 N 4 ) composite photocatalysts C 60 /g-C 3 N 4 were prepared by a facile thermal treatment at 550 °C in atmosphere involving polymerization of dicyandiamide in the presence of C 60 without adding any other reagent. By incorporating C 60 into the matrix of g-C 3 N 4 , the valance band (VB) of g-C 3 N 4 shifts to lower energy position, and thus gives a strong photo-oxidation capability under visible light. The as-prepared sample shows enhanced degradation of phenol and methylene blue (MB) under visible light ( λ > 420 nm). The C 60 /g-C 3 N 4 composites present considerably high photocatalytic degradation activities on phenol and MB, as well as photocurrent response, under visible light irradiation. They are about 2.9, 3.2 and 4.0 times as high as those of bulk g-C 3 N 4 , respectively. Such greatly enhanced photocatalytic activity was originated from the holes and • OH, which can be ascribed to strong interaction of conjugative π-bond between C 60 and g-C 3 N 4 .
368 citations