“…Mainwhile, the composites can be further characterized by element mapping and EDS images (Fig. 6), where the Ag, Si, O and C elements are homogeneously distributed over the whole profile 30–32 . From the above results, we can expect that the strong interfacial coupling effect between AgSiO and Ag 2 CO 3 will promote photogenerated electron-hole pairs separation and transfer, and thus further enhance the photocatalytic performance of AgSiO/Ag 2 CO 3 composites 33 .Figure 6Elemental mapping images and EDS spectrum of the AgSiO/Ag 2 CO 3 -5:1 composite.
…”
Coupling two different semiconductors to form composite photocatalysts is an extremely significant technique for environmental remediation. Here, a one-step in-situ precipitation method has been developed to prepare amorphous silver silicate/carbonate (AgSiO/Ag2CO3) nanoparticles (NPs) composites, which are well dispersed sphere-like particles with the sizes of around ~50–100 nm. The high-efficiency photocatalytic activities under visible light (VL) have been carefully evaluated, and the AgSiO/Ag2CO3 NPs composites exhibit selective photocatalytic degradations on Methylene Blue (MB) and Rhodamine B (RhB). The maximum degradation rate for MB can reach ~99.1% within ~40 min under VL irradiation, much higher than that of RhB (~12%) in the same condition, which can be ascribed to (I) the smaller molecule size of MB than that of RhB, (II) the fast charge separation between AgSiO NPs and Ag2CO3 NPs, abundant heterojunction interfaces as well as fully exposed reactive sites. These composites are proposed to be an example for the preparation of other silicate composite photocatalysts for practical applications in environmental remediation.
“…Mainwhile, the composites can be further characterized by element mapping and EDS images (Fig. 6), where the Ag, Si, O and C elements are homogeneously distributed over the whole profile 30–32 . From the above results, we can expect that the strong interfacial coupling effect between AgSiO and Ag 2 CO 3 will promote photogenerated electron-hole pairs separation and transfer, and thus further enhance the photocatalytic performance of AgSiO/Ag 2 CO 3 composites 33 .Figure 6Elemental mapping images and EDS spectrum of the AgSiO/Ag 2 CO 3 -5:1 composite.
…”
Coupling two different semiconductors to form composite photocatalysts is an extremely significant technique for environmental remediation. Here, a one-step in-situ precipitation method has been developed to prepare amorphous silver silicate/carbonate (AgSiO/Ag2CO3) nanoparticles (NPs) composites, which are well dispersed sphere-like particles with the sizes of around ~50–100 nm. The high-efficiency photocatalytic activities under visible light (VL) have been carefully evaluated, and the AgSiO/Ag2CO3 NPs composites exhibit selective photocatalytic degradations on Methylene Blue (MB) and Rhodamine B (RhB). The maximum degradation rate for MB can reach ~99.1% within ~40 min under VL irradiation, much higher than that of RhB (~12%) in the same condition, which can be ascribed to (I) the smaller molecule size of MB than that of RhB, (II) the fast charge separation between AgSiO NPs and Ag2CO3 NPs, abundant heterojunction interfaces as well as fully exposed reactive sites. These composites are proposed to be an example for the preparation of other silicate composite photocatalysts for practical applications in environmental remediation.
“…Transition metal sulfides (e. g. MoS 2 , WS 2 , Ag 2 S, CuS, and NiS) are also used as photocatalytic H 2 production or CO 2 reduction cocatalysts for TiO 2 ‐based photocatalyst . Among them, MoS 2 is more promising due to its extraordinary physicochemical properties in comparison to CuS and NiS.…”
Section: Categories Of Binary Cocatalystsmentioning
confidence: 99%
“…Other transition metal sulfides such as CuS and NiS were also explored . Chen et al synthesized TiO 2 nanobelts decorated with Au and CuS NPs by electron deposition and successive ionic layer adsorption and reaction (SILAR) method. The modification of Au and CuS extended the light absorption to the visible light region.…”
Section: Categories Of Binary Cocatalystsmentioning
became a Professor at Wuhan University of Technology. His current research interests include semiconductor photocatalysis, photocatalytic hydrogen production, CO 2 reduction to hydrocarbon fuels, and so on.such as noble metals, non-noble metals, metal oxides (e.g., CuO and NiO), [28,40] metal hydroxides, metal sulfides, metal phosphides (e.g., Co 2 P and Ni 2 P) [53,54] and carbonaceous materials. By contrast, some transition metal oxides (e.g., MnO x , CoO x , and Fe 2 O 3 ) [12,22,64] and phosphide (e.g., Co-Pi) [65] are used as oxidation cocatalysts for photocatalytic oxygen evolution reaction and photocatalytic degradation of pollutants.
“…Photoelectrochemical and photoluminescence investigation have demonstrated that the Au-CuS-TiO 2 NBs nanostructure hampers the recombination of photogenerated e − /h + pairs due to the efficient interfacial charge transfer. The ternary Au-CuS-TiO 2 NBs have demonstrated improved photocatalytic activity in removing the antibiotic oxytetracycline (OTC) in an aqueous solution under simulated solar irradiation [100].…”
Photocatalytic nanomaterials such as TiO 2 are receiving a great deal of attention owing to their potential applications in environmental remediation. Nonetheless, the low efficiency of this class of materials in the visible range has, so far, hampered their large-scale application. The increasing demand for highly efficient, visible-light-active photocatalysts can be addressed by hybrid nanostructured materials in which two or more units, each characterised by peculiar physical properties, surface chemistry and morphology, are combined together into a single nano-object with unprecedented chemical-physical properties. The present review intends to focus on hybrid nanomaterials, based on TiO 2 nanoparticles able to perform visible-light-driven photocatalytic processes for environmental applications. We give a brief overview of the synthetic approaches recently proposed in the literature to synthesise hybrid nanocrystals and discuss the potential applications of such nanostructures in water remediation, abatement of atmospheric pollutants (including NO x and volatile organic compounds (VOCs)) and their use in self-cleaning surfaces.
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