Novel ternary heterojunction photcocatalyst of Ag nanoparticles and g-C3N4 nanosheets co-modified BiVO4 for wider spectrum visible-light photocatalytic degradation of refractory pollutant
“…This result demonstrates the strong interfacial coupling effect in the AgSiO/Ag 2 CO 3 composites. Compared with the aggregated or large-size nanoparticles, the nature of AgSiO nanoparticles on Ag 2 CO 3 acted as nano-islands can facilitate the formation of the heterojunction interfaces and guarantee the higher contact areas 13,14 . Both characters are essentials to promote photocatalytic activity and to enhance the separation efficiency of photogenerated charges.Figure 3( A ) FT-IR spectras of pure Ag 2 CO 3 , AgSiO and AgSiO/Ag 2 CO 3 composites; ( B ) UV-vis diffuses reflectance spectra of Ag 2 CO 3 , AgSiO and AgSiO/Ag 2 CO 3 composites.
…”
Section: Resultsmentioning
confidence: 99%
“…According to Figure S3, all the materials except for Ag 2 CO 3 show a narrow pore size distribution with the average diameter of d > 2 nm 13,34 . With further increase of the AgSiO content, the adsorbed volume drops obviously indicating that the enhancement in adsorption volume is not driven solely by the small particles 6,13,35 . The surface areas of the different AgSiO/Ag 2 CO 3 composites and pure AgSiO and Ag 2 CO 3 are also calculated as shown in Fig.…”
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.
“…This result demonstrates the strong interfacial coupling effect in the AgSiO/Ag 2 CO 3 composites. Compared with the aggregated or large-size nanoparticles, the nature of AgSiO nanoparticles on Ag 2 CO 3 acted as nano-islands can facilitate the formation of the heterojunction interfaces and guarantee the higher contact areas 13,14 . Both characters are essentials to promote photocatalytic activity and to enhance the separation efficiency of photogenerated charges.Figure 3( A ) FT-IR spectras of pure Ag 2 CO 3 , AgSiO and AgSiO/Ag 2 CO 3 composites; ( B ) UV-vis diffuses reflectance spectra of Ag 2 CO 3 , AgSiO and AgSiO/Ag 2 CO 3 composites.
…”
Section: Resultsmentioning
confidence: 99%
“…According to Figure S3, all the materials except for Ag 2 CO 3 show a narrow pore size distribution with the average diameter of d > 2 nm 13,34 . With further increase of the AgSiO content, the adsorbed volume drops obviously indicating that the enhancement in adsorption volume is not driven solely by the small particles 6,13,35 . The surface areas of the different AgSiO/Ag 2 CO 3 composites and pure AgSiO and Ag 2 CO 3 are also calculated as shown in Fig.…”
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.
“…E g values of BiVO 4 and BiVO 4 /Mn 1−x Zn x Fe 2 O 4 in Figure 4b were about 2.36 eV. The incorporation of Mn 1−x Zn x Fe 2 O 4 did not change the optical properties of BiVO 4 [18]. The relatively low E g of Ag/BiVO 4 /Mn 1−x Zn x Fe 2 O 4 appeared to strengthen the absorption and sensitivity response for visible light.…”
Section: Resultsmentioning
confidence: 99%
“…Ag is the most promising noble metal because of the low cost and strong electron trapping ability. Ag-doped catalyst could induce surface plasmon resonance, involving in a better absorption of visible light [18]. …”
Ag/BiVO4/Mn1−xZnxFe2O4 was synthesized with a dip-calcination in situ synthesis method. This work was hoped to provide a simple method to synthesis three-phase composite. The phase structure, optical properties and magnetic feature were confirmed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectrometer (XPS), transmission electron microscopy (TEM), ultraviolet-visible diffuse reflectance spectrophotometer (UV-vis DRS), and vibrating sample magnetometer (VSM). The photocatalytic activity was investigated by Rhodamine B (RhB) photo-degradation under visible light irradiation. The photo-degradation rate of RhB was 94.0~96.0% after only 60 min photocatalytic reaction under visible light irradiation, revealing that it had an excellent visible-light-induced photocatalytic activity. In the fifth recycle, the degradation rate of Ag/BiVO4/Mn1−xZnxFe2O4 still reached to 94.0%. Free radical tunnel experiments confirmed the dominant role of •O2− in the photocatalytic process for Ag/BiVO4/Mn1−xZnxFe2O4. Most importantly, the mechanism that multifunction Ag could enhance photocatalytic activity was explained in detail.
“…Due to its visible photocatalytic activity, wide bandgap of 2.42 eV, high stability, and non-toxicity, bismuth vanadate (BiVO 4 ) is a promising n-type semiconductor photocatalyst [19][20][21]. However, its resulting carrier transfer efficiency is relatively poor, leading to the recombination of photogenerated electrons and holes, which severely limits the photocatalytic performance of BiVO 4 .…”
In recent years, BiVO 4 has drawn much attention as a novel photocatalyst given its excellent ability to absorb visible light. This work reports the development of Ag-modified BiV 1-x Mo x O 4 composites through a facile hydrothermal synthesis with the subsequent photoinduced reduction of Ag + at almost neutral pH conditions. Metallic Ag nanoparticles were deposited on the (040) facet of Mo-doped BiVO 4 powders. The crystal structure and morphology of the as-prepared samples were studied by XRD and SEM analyses. Moreover, the photocatalytic performance of BiVO 4 , Ag/BiVO 4 , and Ag-modified BiV 1-x Mo x O 4 were evaluated by the degradation of rhodamine B (RhB). The Ag/BiV 0.9925 Mo 0.0075 O 4 composite exhibited the most efficient photocatalytic performance. The present work provides greater insight into the application of BiVO 4 in the field of photocatalysis.
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