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Construction of novel Z-scheme Ag/ZnFe2O4/Ag/BiTa1-xVxO4 system with enhanced electron transfer capacity for visible light photocatalytic degradation of sulfanilamide
摘要： A novel Z-scheme system, Ag/ZnFe2O4/Ag/BiTa1-xVxO4 with enhanced electron transfer capacity was constructed for degrading sulfanilamide (SAM) using solar light. The photocatalytic activity of Ag/ZnFe2O4/Ag/BiTa1-xVxO4 was investigated. The effects of the mass ratio (ZnFe2O4:BiTaO4), doped V dose, Ag wt.% content, and irradiation time on the catalytic performance were evaluated. The reasonable mechanism of Ag/ZnFe2O4/Ag/BiTa1-xVxO4 solar photocatalytic degradation was also presented. These results reveal Ag/ZnFe2O4/Ag/BiTa1-xVxO4 possesses enhanced photocatalytic performance. The loaded Ag as electron mediator increases the electron transfer rate. Particularly, the doped V and the Fe ions from ZnFe2O4 form a powerful electron driving force, which enhances the electron transfer capacity. Ag/ZnFe2O4/Ag/BiTa1-xVxO4 shows optimal photocatalytic performance at 2.0 wt.% Ag and 0.5% doped V dose (ZnFe2O4:BiTaO4=1.0:0.5). Also, Ag/ZnFe2O4/Ag/BiTa1-xVxO4 exhibits high stability and repeatability in photocatalytic degradation. Several active species (?OH, ?O2?, and h+) are produced in the Z-scheme photodegradation of SAM. These results on the enhanced photocatalytic activity of Ag/ZnFe2O4/Ag/BiTa1-xVxO4 are ascribed to synergistic photocatalytic effects of ZnFe2O4 and BiTa1-xVxO4 mediated through Ag and driven by doped V and Fe ions. Therefore, the Z-scheme Ag/ZnFe2O4/Ag/BiTa1-xVxO4 photocatalytic technology proves to be promising for the solar photocatalytic treatment of antibiotics under solar light.
关键词： visible light,Electron transfer capacity,Ag/ZnFe2O4/Ag/BiTa1-xVxO4,photocatalytic,sulfanilamide
更新于2025-11-21 10:59:37
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Enhanced Selectivity for Oriented Catalyzing Tetracycline by the Functional Inorganic Imprinted ZnFe <sub/>2</sub> O <sub/>4</sub> @Ag <sub/>3</sub> PO <sub/>4</sub> /SiO <sub/>2</sub> Photocatalyst with Excellent Stability
摘要： A novel functional inorganic imprinted ZnFe2O4@Ag3PO4/SiO2 photocatalyst was synthesized by a facile sol-gel method combined with the surface imprinting technique, which possessed excellent stability. By optimizing the amount of materials to determine the preferable addition amounts of tetraethoxysilane (TEOS) and tetracycline are 0.06 mL and 0.06 g, respectively. This as-prepared functional inorganic imprinted ZnFe2O4@Ag3PO4/SiO2 photocatalyst was proved to not only exhibit high photocatalytic activity (the photodegradation rate was 61.52% under the simulated sunlight irradiation of 60 min), but also possess a strong oriented ability to selectively recognize and photocatalyze tetracycline (the coe?cient of selectivity (kselectivity) was 5.14 for ciprofloxacin and 3.63 for gatifloxacin). Moreover, the functional inorganic imprinted ZnFe2O4@Ag3PO4/SiO2 photocatalyst prepared with SiO2 as the inorganic imprinted layer have good stability and can be recycled many times. This work not only puts forward a novel design idea of functional semiconductor materials but also is expected to be widely applied to the oriented catalysis for a target substance according to the practical requirement.
关键词： selectivity,stability,ZnFe2O4@Ag3PO4/SiO2,Inorganic imprinted photocatalyst,tetracycline oriented catalysis
更新于2025-09-23 15:23:52
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Insights into unidirectional migration of photo-excited electrons at ZnFe2O4/graphene van der Waals interface
摘要： Constructing heterojunction based on the energy band step method takes on an effective solution to the high recombination rate of photo-generated carriers in single photocatalysts. Beyond binary/graphene (GR) systems, there is a rising trend of demand in multicomponent/graphene (MMO/GR) photocatalysts due to the unique opportunities offered by these composites. Towards rational design of MMO/GR-based photocatalysts, the evolution of electronic structure at ZnFe2O4/graphene (ZFO/GR) interface is carefully investigated by first-principles calculations within the framework of the density functional theory (DFT). We reveal that the bloom in photocatalytic activity of ZFO/GR mainly be attributed to the unidirectional flow of photo-excited electrons from ZFO to GR but affected by synergetic effects of surface states of ZFO and high electro-conductibility of GR. The general insights in this work not only clarify the nature of enhanced photocatalytic activity of ZFO/GR photocatalyst, but also expand and deepen the knowledge of MMO/GR composites, thus are allowed for the future rational design of MMO/GR-based energy conversion materials.
关键词： ZnFe2O4,Graphene,vdW heterostructure,Photocatalysis
更新于2025-09-23 15:21:01
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Synergetic adsorption and photo-Fenton degradation of methylene blue by ZnFe <sub/>2</sub> O <sub/>4</sub> /SiO <sub/>2</sub> magnetic double-mesoporous-shelled hollow spheres
摘要： Adsorption and Fenton technologies have been widely employed to deal with wastewater. ZnFe2O4/SiO2 magnetic double-mesoporous-shelled hollow spheres (MDSHSs) were feasibly synthesized by a solvothermal method. The as-synthesized MDSHSs show excellent adsorption and selectivity for methylene blue (MB), which it took about only 1 min to reach the adsorption equilibrium. About 50% MB was removed by adsorption, and other 50% MB was degraded under further photo-Fenton process. Effects of experimental conditions on the adsorption and photo-Fenton process were investigated. The mechanisms of MDSHSs formation and photo-Fenton process were proposed. Total organic carbon (TOC) reduction reached as high as 90% with 60 mg/L of MB for 90 min. The experimental results indicated that MDSHSs exhibit a remarkable adsorption and catalytic activity for photo-Fenton process in a wide pH range of 3.3–11.0. Simultaneously, the composite shows an excellent stability and reusability.
关键词： photo-Fenton,magnetic property,porous materials,ZnFe2O4/SiO2,adsorption
更新于2025-09-23 15:19:57
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Sonochemical synthesis of novel ZnFe2O4/CeO2 heterojunction with highly enhanced visible light photocatalytic activity
摘要： An eco-friendly ZnFe2O4/CeO2 nanocomposites as visible light photocatalysts with different mole ratios were successfully fabricated by sonochemical method. The nanocomposites material was characterized various analytical techniques such as X-ray diffraction (XRD), UV–vis diffuse reflectance spectroscopy (DRS), fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller surface area analysis (BET). The synthesized ZnFe2O4/CeO2 nanocomposites were used to remove malachite green (MG) as a model organic pollution under visible light irradiation. The enhanced photocatalytic activity was described with the term was increased a light absorption intensity enable too appeared a bandgap present in the electron transfer, scavengers of the reactive species and charge prolonged photogenerated carriers. Results showed that the ZnFe2O4/CeO2 nanocomposite in a 0.5:0.5 mol ratio exhibited the superior photocatalytic activity towards wastewater treatment. The synthesized catalyst having capability for enhance photoactive nanocomposites open up a new opportunities in various areas in photocatalysis.
关键词： Photocatalytic degradation,Visible light,ZnFe2O4/CeO2 nanocomposites
更新于2025-09-19 17:15:36
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Electrostatic self-assembly synthesis of ZnFe2O4 quantum dots (ZnFe2O4@C) and electromagnetic microwave absorption
摘要： Making effective usage of quantum size effect is a foregrounded strategy to design and fabricate excellent electromagnetic microwave absorption materials. In this research, ZnFe2O4 quantum dots were coated by hybrid amorphous carbon to form a sea islands structure by a facile electrostatic self-assembly synthetic technology. Simultaneously, the rejection of heterogeneous charges leads to the formation of quantum dots, by which the quantum size effects on dielectric and magnetic characteristic were investigated. Consequently, multiple hetero-interface and interfacial polarization was originated from polycrystalline feature of ZnFe2O4 with spinel and inverse spinel structures. In particular, the electromagnetic microwave absorption properties of ZnFe2O4 were greatly optimized, as the minimized reflection loss reached -40.68 dB at the frequency 11.44 GHz and thickness 2.5 mm, while the effective bandwidth corresponding was 3.66 GHz (from 9.87 to 13.52 GHz). The largest effective bandwidth was 4.16 GHz (from 8.08 to 12.24GHz) with a thickness of 3 mm. It is suggested that high performance of microwave absorption of ZnFe2O4 quantum dots was well guided by the optimized impedance matching and attenuation constants.
关键词： Electromagnetic microwave absorption,interfacial polarization,ZnFe2O4 quantum dots,polycrystalline,Electrostatic self-assembly
更新于2025-09-16 10:30:52
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Nanoparticles-assembled ZnFe2O4 mesoporous nanorods for physicochemical and magnetic properties
摘要： Hierarchically one dimensional (1-D) mesoporous ZnFe2O4 rods with nanoparticles as their building blocks have been synthesized by the solvothermal approach. The influence of annealing temperature on structural, morphological, optical and magnetic properties was intensively investigated. X-ray diffraction was used to ascertain the phase purity of synthesized samples. To perceive the information on morphological and structural features, field emission scanning electron microscopy and high resolution transmission electron microscopy with energy dispersive spectroscopy was probed. It was observed that nanorods with high aspect ratio were obtained when treated at 600 °C (ZF600) annealing temperature as compared to 400 °C (ZF400). Fourier transform infra-red spectroscopy was resorted to gain the insight of bonding mechanism associated with ZF400 and ZF600. To enrich the study on material chemistry and defects, Raman spectroscopy and X-ray photoelectron spectroscopy was performed. Brunauer–Emmett–Teller envisioned the surface area of ZF400 and ZF600. It was found that surface area decreases with increase in annealing temperature. UV–Vis spectroscopy expounds that the optical band gap increases with annealing temperature from 3.0 to 3.3 eV for ZF400 to ZF600 respectively. Magnetic measurements were performed on vibrating sample magnetometer at room temperature and the results decipher the superparamagnetic nature of the synthesized material. Additionally, saturation magnetization was found to increase with annealing temperature.
关键词： optical properties,nanorods,ZnFe2O4,solvothermal,magnetic properties,annealing
更新于2025-09-11 14:15:04
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Hybrid microwave annealing for fabrication of more efficient semiconductor photoanodes for solar water splitting
摘要： Hybrid microwave annealing (HMA) is proposed as an alternative to conventional thermal annealing (CTA) in a furnace to fabricate efficient semiconductor photoelectrodes for solar water splitting. Thus the effects of HMA are investigated in comparison with CTA using spinel zinc ferrite as an example. The ZnFe2O4 photoanodes fabricated by HMA with a graphite susceptor provide less defective surface, better structural ordering and smaller feature size than photoanodes prepared by CTA. Besides, HMA does not impair conductivity of the F:SnO2 glass substrate. All these positive factors of HMA leads to ~4 times higher photocurrents at 1.23 VRHE and lowered onset potential by ~100 mV under 1-sun irradiation of an optimized ZnFe2O4 photoanode relative to that fabricated by CTA. The HMA could be an effective generic method to fabricate efficient photoelectrodes based on refractory semiconductors replacing incumbent CTA.
关键词： Conventional thermal annealing,ZnFe2O4,Hybrid microwave annealing,Photoelectrochemical water splitting
更新于2025-09-10 09:29:36
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Full-Spectrum Photocatalytic Activity of ZnO/CuO/ZnFe2O4 Nanocomposite as a PhotoFenton-Like Catalyst
摘要： Deriving photocatalysts by the calcination of hydrotalcite-like compounds has attracted growing interest for extending their photocatalytic activity to the visible and even near-infrared (NIR) light regions. Herein, we describe the acquisition of a ZnO/CuO/ZnFe2O4 nanocomposite with good photoFenton-like catalytic activity under UV, visible and near-infrared (NIR) light irradiation by optimizing the calcination temperature of the coprecipitation product of Zn2+, Cu2+ and Fe3+. The ZnO/CuO/ZnFe2O4 nanocomposite is composed of symbiotic crystals of ZnO, CuO and ZnFe2O4, which enable the nanocomposite to show absorption in the UV, visible and NIR light regions and to produce a transient photocurrent in the presence of H2O2 under NIR irradiation. The full-spectrum photoFenton-like catalyst shows improved performance for the degradation of methyl orange with an increasing amount of H2O2 and is very stable in the recycling process. We believe that the ZnO/CuO/ZnFe2O4 nanocomposite is a promising full-spectrum photoFenton-like catalyst for the degradation of organic pollutants.
关键词： ZnO/CuO/ZnFe2O4,photodegradation,Full-spectrum,nanocomposite,photoFenton-like catalyst,near-infrared light,photocatalysis
更新于2025-09-10 09:29:36
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Effect of the solvents on the photocatalytic properties of ZnFe2O4 fabricated by solvothermal method
摘要： The photocatalyst ZnFe2O4 (ZFO) nanoparticles with different diameters were synthesized by a solvothermal method using water, ethylene glycol (EG) and methylgiycol (EM) as the solvents. The results showed that the polarity of the solvents have an important influence on morphology and photocatalytic performance of the ZnFe2O4. The higher polarity of the solvent (H2O) was benefited to form smaller diameter nanoparticles, which showed higher photocatalytic efficiency. The removal efficiencies of the ZFO/H2O, ZFO/EG and ZFO/EM for MB were 85.42%, 61.11% and 51.19%, which accorded with the order of the polarity of solvents.
关键词： ZnFe2O4,Nanoparticles,Solvothermal,Photocatalytic,Polarity
更新于2025-09-09 09:28:46