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1.
Novel carbon black (CB)/Ag 3PO 4 compound photocatalysts were synthesized from a hydrothermal method and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy and electrochemical methods. The photocatalytic oxidation ability of CB/Ag 3PO 4 was evaluated through methyl orange degradation experiments under visible light irradiation. The CB/Ag 3PO 4 showed higher photocatalytic activity than pure Ag 3PO 4. It was indicated the compound catalysts could absorb and utilize more optical energy to improve the photocatalytic activity, which was attributed to the ability of carbon black to accelerate the electron-hole separation. In particular, the methyl orange photocatalytic degradation rate over the 7?mg/L CB/Ag 3PO 4 was 1.6 times that of Ag 3PO 4. And the results of the cyclic experiment show that the photocatalyst has good stability. Moreover, the mechanism about the photocatalytic activity of CB/Ag 3PO 4 compounds was investigated. In this photocatalytic reaction, ?OH was the major active substrate responsible for the visible-light-driven degradation. 相似文献
2.
Leaf-like InVO 4/BiVO 4 nanoarchitectures with scale of 2 μm–5 μm were prepared by a facile hydrothermal method. Ag 3PO 4 quantum dots (QDs) were then deposited onto the surface of leaf-like InVO 4/BiVO 4 crystals via a simple deposition–precipitation technique. The photocatalytic tests displayed that the Ag 3PO 4/InVO 4/BiVO 4 nanocomposite possesses a much higher rate for degradation of rhodamine B (Rh B) than the sum of BiVO 4, InVO 4, Ag 3PO 4, Ag 3PO 4/InVO 4, Ag 3PO 4/BiVO 4 or InVO 4/BiVO 4 under visible light irradiation. The observed improvement in photocatalytic performance is associated with the extended absorption in the visible light region resulting from the Ag 3PO 4 QD loading, the high specific surface area, and the effective separation of photogenerated carriers at the Ag 3PO 4/InVO 4/BiVO 4 interfaces. 相似文献
3.
Heterogeneous Ag/Ag 3PO 4/BiPO 4 photocatalyst was synthesized by a one-step low temperature chemical bath method and exhibited better photocatalytic activity and better stability than those of individual Ag 3PO 4 or BiPO 4 nanoparticles for photodegradation of organic compounds (Rhodamine B) in the absence of electron accepters under visible light ( λ>420 nm). The enhanced photocatalytic performance is mainly ascribed to the strong visible-light absorption originating from high efficient separations of photogenerated electron–hole pairs through Ag 3PO 4/BiPO 4 and Ag/Ag 3PO 4 heterostructures. 相似文献
4.
The 1D Ag 3PO 4 sensitized SrTiO 3 nanowires are prepared by simple route of electrospinning-in situ deposition technique. The results of the thermogravimetry (TG), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive Spectrometer (EDS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and UV–Visible diffuse reflectance spectroscopy (UV–Vis) indicate that the Ag 3PO 4 nanoparticles has been deposited on the surface of the SrTiO 3 nanowires successfully. Experimental results showed that compared with pure SrTiO 3, the as-prepared 1D Ag 3PO 4 sensitized SrTiO 3 nanowires exhibit obvious enhancement of photocatalytic performance and stability. Especially, the Ag 3PO 4/SrTiO 3 (3AS sample) had a satisfactory photocatalytic activity for degrading methylene blue (MB) more than 98% under visible light irradiation. As to pure SrTiO 3 and Ag 3PO 4, only 9.8% and 49% of MB was decomposed after 35?min irradiation respectively. Furthermore, the mechanism of the enhancing photocatalytic activity could be ascribed to the nano-heterojunction of the Ag 3PO 4/SrTiO 3, the visible light response of the Ag 3PO 4, and the 1D structure of the nanowires. 相似文献
5.
Ag 3PO 4 nanoparticles with 50–100 nm in size distributed on the surface of ZnO nanorods with ca. 20 nm in diameter and 1–2 μm in length have been synthesized by a facile method. The Ag 3PO 4–ZnO nanorod composites had much higher photocatalytic activity toward degradation of Rhodamine B (RhB) under visible light irradiation than pure ZnO nanorods, and had better recyclability and stability than pure Ag 3PO 4 nanoparticles. The Ag 3PO 4–ZnO nanorod composite with the molar ratio of Ag 3PO 4:ZnO = 1:40 exhibited the highest photodegradation efficiency of RhB (93%), which was 1.5 times of pure ZnO nanorods. 相似文献
6.
Ag 3PO 4/AgVO 3 heterojunctions with high photocatalytic activities were synthesized via a simple and practical low-temperature solution-phase route by using AgVO 3 nanowires as substrate materials. The as-prepared Ag 3PO 4/AgVO 3 heterojunctions included Ag 3PO 4 quantum dots assembling uniformly on the surface of AgVO 3 nanowires. Compared with pure AgVO 3 nanowires, Ag 3PO 4/AgVO 3 composite photocatalysts exhibited enhanced photocatalytic activities under visible light irradiation in the decomposition of 4-chlorophenol (4-CP) ethanol solution. The enhanced performance is believed to be induced by the high specific surface area, strong visible-light absorption originating from the quantum dot sensitization of Ag 3PO 4, and high efficient separation of photogenerated electron–hole pairs through Ag 3PO 4/AgVO 3 heterojunction. 相似文献
7.
The BiOCl/Ag 3PO 4 composites have been prepared via a facile and reproducible route. In the composite, Ag 3PO 4 particles are deposited on the surface of plates of BiOCl. Among the as‐prepared samples, the ultraviolet (UV) and visible light photocatalytic reaction rates of BiOCl/Ag 3PO 4 composite with the ratio of 1:0.1 are about 4.4 times and 4.5 times than that of pure BiOCl, respectively. Overall, the BiOCl/Ag 3PO 4 composites not only show highly enhanced visible light photocatalytic activity but also exhibit highly improved UV photocatalytic activity, which could find enormous potential application in addressing environmental protection issues utilizing solar energy effectively. 相似文献
8.
Saddle-like Ag 3PO 4 particles of tetrahedron structure were successfully synthesized using a co-precipitation method by mixing H 3PO 4 ethanol solution and AgNO 3 ethanol aqueous solution, where the percentage of ethanol in AgNO 3 ethanol aqueous solution was varied at 0, 50, 80, 90 and 100% (v/v). The photocatalytic performance of the synthesized samples was evaluated by photodegradation of Rhodamine B (RhB) under blue light irradiation (λ = 455 nm). The results showed that the morphology of the Ag 3PO 4 particles greatly changed depending on the ethanol content in the reaction solution. Excellent photocatalytic activity was observed at 80% (v/v) of ethanol, where the Ag 3PO 4 showed saddle-like morphology derived from the tetrahedron structure. 相似文献
9.
In an attempt to develop nanostructured photocatalysts with high performance, SrTiO 3/Ag 3PO 4 hetero-nanostructures were successfully fabricated. The formed binary heterojunctions were composed of SrTiO 3 nanotubes prepared using liquid-phase deposition, and Ag 3PO 4 nanoparticles prepared using a sol–gel method. Synthesis details, including morphology, structure, and optical properties of the prepared photocatalysts, were characterized and comparatively discussed. The results showed that at an optimal ratio of SrTiO 3 to Ag 3PO 4 (20–80), the photocatalytic degradation of Basic Blue 41 under 80-min visible light irradiation is the maximum amount of 99%, which is about 4.4 and 1.5 times higher than that of pristine SrTiO 3 nanorods and Ag 3PO 4 nanoparticles, respectively. It can be due to the synergistic effect of two materials that provide high light absorption and charge carriers’ separation. Finally, a detailed possible mechanism for enhancing the photocatalytic activity of the SrTiO 3/Ag 3PO 4 hetero-nanostructures was proposed. 相似文献
10.
The Ag 3PO 4 porous microtubes are, for the first time, prepared by a one-pot synthesis using polyethylene glycol 200 (PEG200) as the reaction medium. This study establishes that PEG 200 plays a vital role in the formation of the unique structures. Under visible light irradiation (≥ 420 nm), the porous sample exhibits a higher photocatalytic activity for the degradation of RhB than solid Ag 3PO 4 and Ag 3PO 4 tetrapods, which has been mainly ascribed to the novel hollow structure. 相似文献
11.
The present study reports for the first time the performance of silver phosphate (Ag 3PO 4) microcrystals as photocatalyst (degradation of Rodamine B-RhB) and antifungal agent (against Candida albicans– C. albicans) under visible-light irradiation (455 nm). Ag 3PO 4 microcrystals were synthesized by a simple co-precipitation (CP) method at room temperature. The structural and electronic properties of the as-synthetized Ag 3PO 4 have been investigated before and after 4 cycles of RhB degradation under visible light using X-ray diffraction (XRD), micro-Raman spectroscopy, UV–Vis spectrophotometer and field emission scanning electron microscopy (FE-SEM) images. The antifungal activity was analyzed in planktonic cells and 48h-biofilm of C. albicans by colony forming units (CFU) counting, confocal laser and FE-SE microscopies. Statistical analysis was carried out using SPSS software. Morphological and structural modifications of Ag 3PO 4 were observed upon recycling. After 4 recycles, the material maintained its photodegradation property; an eightfold increase in the efficiency of Ag 3PO 4 was observed in planktonic cells and a two fold increase in biofilm when irradiated under visible light. Thus, higher antifungal effectiveness against C. albicans was obtained when associated with visible-light irradiation. 相似文献
12.
BACKGROUND: This work deals with the development of an active heterogeneous catalyst for selective organic synthesis under both visible light and UV irradiation to utilize efficiently solar light. Very few studies have been reported on the selective photooxidation performance of multimetal oxide materials under visible light irradiation. The photocatalytic degradation of azodyes was investigated systematically in aqueous NiO/Ag 3VO 4 dispersion under visible light irradiation. RESULTS: The catalyst NiO/Ag 3VO 4 showed high activity and selectivity for the photodegradation of the nonbiodegradable azodyes acid red B, reactive brilliant red X‐3B, and acid orange 7. From total organic carbon (TOC), Fourier transform infrared spectroscopy (FTIR), and gas chromatography/mass spectroscopy analyses, the tested azodyes were selectively oxidized into aromatic and aliphatic acids without any decrease of TOC. The high photooxidation selectivity also applied to UV light irradiation. Electron spin resonance and radical scavenger studies suggest that the anionic superoxide radical O 2?? was the predominant active species in the photocatalytic reaction. CONCLUSION: The selectivity of NiO/Ag 3VO 4 for the oxidation of azodyes was not affected by the energy of light (UV and visible light). This approach allows effective controlled oxidation but avoids undesirable mineralization into CO 2 and H 2O. Copyright © 2010 Society of Chemical Industry 相似文献
13.
A simple, environment-friendly and easily operating strategy, inositol hexaphosphoric sodium assisted soft template method, has been developed for synthesis of uniform Ag 3PO 4 nanocrystals (NCs) with controlled size in the range of 40 to 50 nm. The Ag 3PO 4 NCs exhibit superior photocatalytic activity compared with micron-sized Ag 3PO 4 particles under visible light. This approach is a general method and can be extended to the synthesis of a variety of other silver salts NCs. 相似文献
14.
A facile, one-step synthesis of graphene-oxide (GO)/Ag 3PO 4 was prepared. The as-prepared samples were characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS) and fourier transformed infrared (FT-IR) spectroscopy. The SEM image indicated that Ag 3PO 4 particles were mainly distributed on the surface of GO sheets uniformly. DRS analysis revealed that the samples had good visible light response. The photocatalytic activity of the composites was evaluated by the degradation of Rhodamine B (RhB) and Bisphenol A (BPA). The results indicated that the photocatalytic performance of GO/Ag 3PO 4 was greatly enhanced after introduction of GO. The photocatalytic degradation efficiency of colorless chemical pollutants (BPA) over GO/Ag 3PO 4 was higher than that of Ag 3PO 4, and the possible degradation path was proposed by liquid chromatography mass spectrometry (LC-MS) analysis. Moreover, the photocatalytic stability was discussed by XRD and FT-IR spectroscopy analysis. Based on the experimental results, a possible visible-light photocatalytic degradation mechanism was also discussed. 相似文献
15.
Recently, there has been a significant interest in developing high-performance photocatalysts for removing organic pollutants from water environment. Herein, a ternary graphitic C 3N 4 (g-C 3N 4)/Ag 3PO 4/AgBr composite photocatalyst is synthesized using an in-situ precipitation-anion-exchange process and characterized by several spectroscopic and microscopic techniques. During the photocatalytic reaction, X-ray photoelectron spectroscopy clearly illustrated the formation of metallic Ag on the g-C 3N 4/Ag 3PO 4/AgBr composite surface. The ternary composite photocatalyst demonstrated an increased photoactivity under visible light (>420 nm), achieving a complete decolorization of methyl orange (MO) in 5 min. The ternary g-C 3N 4/Ag 3PO 4/AgBr hybrid was also applied to the 2-chlorophenol degradation under visible light, further confirming its excellent photocatalytic activity. In addition, quenching experiments revealed that holes (h +) and O 2?– were the major attack species in the decolorization of MO. The enhanced photoactivity of g-C 3N 4/Ag 3PO 4/AgBr results from the efficient transfer/separation of photoinduced charges with the dual Z-scheme pathway and the charge recombination sites on the formed Ag particles. 相似文献
16.
Introducing magnetic metal onto semiconductor materials has been proven to be an attractive strategy for enhancing the photocatalytic activity in the visible region. In this work, ternary heterostructure magnetic semiconductor photocatalyst RGO/ZnFe2O4/Ag2WO4 was successfully synthesized through a simple hydrothermal method and was evaluated by photodegradation of Rhodamine B (RhB) under visible light irradiation. The composition, structure, morphology, and optical absorption properties of the as-prepared photocatalyst were investigated by XRD, FT-IR, SEM, and UV–Vis DRS, respectively. It was found that the photocatalytic activity under visible light irradiation was in the order of RGO/ZnFe2O4/Ag2WO4?>?ZnFe2O4?>?Ag2WO4?>?RGO/ZnFe2O4 and RGO/ZnFe2O4/Ag2WO4. The enhancement of photocatalytic performance could be attributed to the reduced graphene oxide sheets can function as an electron collector and transporter to lengthen the lifetime of the charge carriers, improving the whole photocatalytic activity. The reaction kinetics, possible degradation pathway, and catalyst stability, as well as the roles of ZnFe2O4 and Ag2WO4 in photoreaction, were comprehensively studied. The obtained results indicate that the prepared magnetic and effective catalytic materials could be potentially applied in environmental organic pollutants purification. 相似文献
17.
The Ag 3PO 4/CeO 2 heterojunction photocatalyst prepared by an ultrasound-assisted method exhibits an enhanced photocatalytic activity compared to pure Ag 3PO 4, CeO 2, and Ag 3PO 4/CeO 2 obtained without ultrasound action. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and ultraviolet–visible absorption spectroscopy (UV–vis), and the effects of ultrasound on the physicochemical properties and photocatalytic activity of Ag 3PO 4/CeO 2 are discussed. Results show that the ultrasound-assisted synthesis method significantly improves the photocatalytic ability. The mechanism about the improvement was discussed in details. 相似文献
18.
Ag 3PO 4/TiO 2 nanosheet (TNS) heterojunction photocatalysts with almost 100% exposed (001) facets were fabricated via a facile in situ growth process. The Ag 3PO 4/TNS exhibited remarkable photocatalytic activity for the degradation of rhodamine B (RhB) and it was significantly more recyclable under sunlight compared with Ag 3PO 4. The RhB degradation efficiency was 99.11% after 50 min of sunlight irradiation, and was 85.8% after three cycles. The photocatalytic degradation mechanism of RhB over the Ag 3PO 4/TNS heterojunctions is driven by both photogenerated holes (h +) and ·O 2− radicals. This efficient and reusable Ag 3PO 4/TNS heterojunction photocatalyst is not only suitable for fundamental research but also has potential for practical applications in the energy and environmental fields. This study demonstrates that applying morphology engineering to heterojunctions is useful for developing composite photocatalysts with greatly improved properties. 相似文献
19.
Silver-modified TiO 2 nanorods (SMTN) have been synthesized via controlled hydrolysis of tetrabutyltitanate (TBOT) in ethanol and immersion method by using AgNO 3 as an Ag source. The physical and chemical properties of SMTN were studied by XRD, SEM, TEM, and UV–vis diffuse reflectance spectra (DRS). The photocatalytic activity of the as-prepared products was evaluated by photocatalytic decolorization of Rhodamine B (Rh B) aqueous solution at ambient temperature under visible light irradiation. The experimental results reveal that the TiO 2 nanorods, which are well dispersed and uniform, attached large numbers of silver nanoparticles on the surface, and the major crystalline phase of TiO 2 is anatase. The photocatalytic activity research shows that the SMTN exhibit an enhanced photocatalytic activity in visible light region compared with that of pure TiO 2 nanorods and commercial TiO 2 (P25). 相似文献
20.
Ag 3PO 4 catalysts exhibited excellent photocatalytic performance in the degradation and the mineralization of bisphenol A, displaying considerably higher photocatalytic activity than N–TiO 2 under visible light (λ > 420 nm). The trapping effects of different scavengers and spectrophotometric results proved that the oxidation of bisphenol A mainly occurred at photogenerated holes on the Ag 3PO 4 surface, along with a two-electron reduction of dissolved oxygen to H 2O 2. 相似文献
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