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Enhanced Visible Light Photocatalytic Performance of G-C3N4 Photocatalysts Co-Doped with Gold and Sulfur for Degradation of Persistent Pollutant (Rhodamine B)
摘要： In order to overcome the intrinsic drawback of pristine g-C3N4, a nano-composite photo-catalyst Au/S-C3N4 with controllable nanoscale gold (Au) particles was successfully synthesized by a facile liquid chemical preparation process. It was found that the content of chloroauric acid (AuCl3·HCl·4H2O) play crucial role in both the diameter and the density of the Au nanoparticles. The results showed that as-prepared Au/S-C3N4 nanosheets with 2 wt% Au loaded content exhibited excellent photocatalytic decomposition of RhB under visible light irradiation as compared with other Au loadings (i.e., 1 wt%, 2 wt%, 3 wt%, 4 wt% and 6 wt%). The photocatalytic activity of Au/S-C3N4 with 2 wt% Au loading was twice higher than that of bare S-C3N4 (0.00955 min?1). The enhanced performance could be attributed to the synergic effect of gold and sulfur on g-C3N4. A possible mechanism for elucidating the better performance of Au/S-C3N4 is also proposed and discussed in detail in this work.
关键词： Au Nanoparticles,Contact System,Photocatalytic Activity,g-C3N4,Rhodamine B
更新于2025-09-09 09:28:46
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Ni and Co Substituted Zinc Ferri-chromite: A Study of their Influence in Photocatalytic Performance
摘要： Enhanced photocatalytic activity was demonstrated in the present study for two systems i.e., Zn1-xNixFeCrO4 and Zn1-xCoxFeCrO4 (0.0 ≤ x ≤ 1.0) in photo degradation of methyl orange, methyl red and congo red dyes. The basic aim of this study is to find a suitable compound of doped zinc ferrichromite as photocatalyst for degradation of organic dyes. A sol-gel process used for synthesis of crystalline nanopowders gave better photocatalytic activity under the UV light radiations. The result showed that, dyes undergo fast degradation with UV light in presence of doped compounds. The rate of degradation of dyes was estimated spectro-photometrically from residual concentration in dyes.
关键词： Surface area,synthesis,Pore volume,Photocatalytic activity,Sol-gel
更新于2025-09-09 09:28:46
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Sol-gel synthesis of new ZnFe2O4/Na-bentonite composites for simultaneous oxidation of RhB and reduction of Cr(VI) under visible light irradiation
摘要： To improve the photogenerated charge carrier separation and stability of ZnFe2O4, we prepared new ZnFe2O4/Na-bentonite composites using Na-bentonite as the carrier via a sol-gel method. The composition, surface morphology and optical properties of samples were characterized by XRD, TEM, XPS, FTIR and UV–vis DRS analysis. The results of TEM and XPS show that the ZnFe2O4 nanoparticles spread on the thin layers of Na-bentonite due to intercalation with Na-bentonite. The simultaneous removal of the Cr(VI)-RhB mock wastewater system by ZnFe2O4/Na-bentonite composites, the results are 88.6% for Cr(VI) and 94.2% for RhB in 120 min, which is 1.3-fold higher of Cr(VI) reduction than that of the individual ones. Based on experimental results of PL and reactive species involved in the removal of RhB and Cr(VI), the enhanced photocatalytic activity of the new ZnFe2O4/Na-bentonite composite could be due to visible-light adsorption ability, larger interfacial area, as well as effective transfer and prolonged charge-hole separation.
关键词： Na-bentonite,photocatalytic activity,ZnFe2O4,stability,sol-gel
更新于2025-09-09 09:28:46
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Enhanced visible-light photocatalytic activity of ZnS/BiOBr/graphene oxide ternary composite
摘要： In this paper, a facile and highly efficient ternary composite ZnS/BiOBr/Graphene oxide (ZnS/BiOBr/GO) with zinc vacancies was successfully synthesized by solvothermal method. The photocatalysts showed an efficient photocatalytic performance for organic pollutant under visible light irradiation. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflectance spectrophotometer (DRS), and photoluminescence spectroscopy (PL). The experimental results indicated that the 100 mg ZnS and 6 mg GO co-doped BiOBr (100ZBG-6) shows the highest photocatalytic activity, achieving 86.6% degradation efficiency for Rhodamine B (RhB) under visible light irradiation, which was 28.7 and 6.1 times than that of pure ZnS and BiOBr. It is indicated that the ZnS/BiOBr/GO composite has the great potential application in the degradation organic pollutant. This article describes the enhancement of light absorption and photocatalytic activity by synthesizing zinc vacancies of ZnS and introducing GO modified BiOBr.
关键词： Zinc vacancies,ZnS/BiOBr/Graphene oxide,Organic pollutant,Photocatalytic activity,Visible light
更新于2025-09-09 09:28:46
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Microstructure and photocatalytic performance of BiVO4 prepared by hydrothermal method
摘要： Monoclinic BiVO4 photocatalyst was hydrothermally synthesized at different pH conditions without surfactant. The microstructure and photocatalytic behavior of as?prepared samples were characterized by X?ray diffraction, scanning electron microscope, transmission electron microscopy, UV?vis diffuse reflectance spectra, electrochemical workstation and dye degradation experiment. The results show that the pH value had a significant influence on the microstructure and photocatalytic performance of BiVO4. In acid environment, heavy precipitation of tetragonal BiVO4 took place in a short time at room temperature, whereas only amorphous powders formed as the pH value was equal or higher than 7. The monoclinic BiVO4 gradually nucleated and grew at the early stage of synthesis procedure at 180°C, and finally became the unique crystalline phase. The relationship between microstructure and photocatalytic activity the photocatalyst was well discussed. It is observed that the BiVO4 prepared in the neutral condition (pH 7) exhibited desirable photocatalytic degradation efficiency toward Rhodamine B solution, mainly due to the efficient separation of photogenerated electron?hole pairs and enhanced visual light absorption during degradation process, which were ascribed to the comprehensive function of high exposed {010} crystal facets, close packed structure, small particle size, and special floating characteristic.
关键词： BiVO4,microstructure,photogenerated electron?hole pairs,photocatalyst,photocatalytic activity
更新于2025-09-09 09:28:46
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Composition, Morphology, Structure and Photocatalytic Performances of Photocatalysts Prepared from Titanium Potassium Oxalate
摘要： In this work, different products were synthesized using potassium titanium oxalate as the precursor when the reaction conditions varied. The influences of reaction system conditions on the formation features, particle size, phase composition, morphology and properties of the products were investigated and discussed. The XRD and SEM results indicated that TiO2 with different morphology and particle size were prepared by a hydrothermal treatment of the reaction system including HCl and H2O2 solution, and its degradation rate reached 100% after 100 min under UV irradiation. However, under the conditions without H2O2, a new product C2O7Ti2·3H2O with a large crystal of hexagonal prism was synthesized. Photocatalytic degradation of methyl orange (MO) indicated that C2O7Ti2·3H2O exhibited high photocatalytic activity. And the results of the active species detection show that ?O2? was the main reactive species for MO degradation. The formation mechanism of the product prepared by different reaction system was also discussed.
关键词： Titanium potassium oxalate,Morphology control,Photocatalytic activity,C2O7Ti2·3H2O,TiO2
更新于2025-09-09 09:28:46
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Synthesis and photocatalytic activity of composite magnetic photocatalyst Mn <sub/>x</sub> Zn <sub/>1-x</sub> Fe <sub/>2</sub> O <sub/>4</sub> /α-Bi <sub/>2</sub> O <sub/>3</sub>
摘要： In this paper, a new magnetic photocatalyst MnxZn1-xFe2O4/α-Bi2O3 is synthesized by the dip-calcination technology, using manganese zinc ferrite as a magnetic substrate. It is beneficial to separate the composite from liquid solution under an extra magnetic field. This heterojunction of composite MnxZn1-xFe2O4/α-Bi2O3 presents remarkable photocatalytic activity and prominent photocatalysis for degradation of Rhodamine B (RhB), far exceeding the pure α-Bi2O3. Especially, the introduction of MnxZn1-xFe2O4 not only reduces the bandgap of photocatalyst α-Bi2O3, but also improves its response in the visible region. Importantly, the magnetic photocatalyst is capable of being used repeatedly, and the photocatalytic activity would remain above 90% after 3 cycles. Such an outstanding stability and retrievability of composite are mainly ascribed to the soft-magnetic material MnxZn1-xFe2O4, enhancing separation of photoinduced electron hole pairs. This work will replace the traditional semiconductor photocatalyst for a convenient recycling and removal of contaminants from wastewater in the future.
关键词： MnxZn1-xFe2O4,α-Bi2O3,photocatalytic activity,magnetic photocatalyst
更新于2025-09-09 09:28:46
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Synthesis and characterization of SiO2 doped Fe2O3 nanoparticles: Photocatalytic and antimicrobial activity evaluation
摘要： Silica doped iron oxide (SiO2 doped Fe2O3) nanoparticles (NPs) were successfully synthesized by co-precipitation method at 70 °C using different solvents (acetonitrile, n-hexane and isoamyl alcohol). The synthesized NPs were characterized by FT-IR, X-Ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), thermal gravimetric analysis-differential scanning calorimetry (TGA-DSC) and dynamic light scattering (DLS) techniques. The size of SiO2 doped Fe2O3 NPs was in the range of 5.89 nm–19.89 nm and ellipsoidal morphology with tendency of aggregate formation due to dipole-dipole interactions. The solvents showed variable effect on physico-chemical properties of the NPs. As-synthesized NPs were also evaluated for the antimicrobial activity against set of bacterial and fungal strains i.e., Candida parapsilosis, Aspergilus niger, Bacillus subtilis and Escherichia coli. It was observed that solvents also affected the NPs antimicrobial activity. The SiO2 doped Fe2O3 NPs prepared in acetonitrile showed highest antibacterial as well as antifungal activity. The MIC values were recorded to be 0.31 mg/L and 0.21 mg/L (acetonitrile) and 0.24 mg/L and 0.18 mg/L (isoamyl alcohol) for C. parapsilosis and A. niger, respectively. NPs prepared in n-hexane showed the MIC value of 0.09 mg/L. The photo-caalytic activity (PCA) was evaluated by degrading Rhodamine B (RhB) dye. The RhB degradation was 83% for Fe2O3 NPs, which was enhanced considerably in case of doping, solvents also showed variable effect on the PCA for RhB dye degradation. Results revealed that the SiO2 doped Fe2O3 NPs are ef?cient anti-microbial agent as well as highly active photocatalysts and could possibly be used for the degradation of dyes in textile wastewater.
关键词： Antibacterial activity,Physico-chemical properties,Photocatalytic activity,Doping,Nanoparticle,Solvents effect
更新于2025-09-04 15:30:14
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Light-Induced Assembly of Metal Nanoparticles on ZnO Enhances the Generation of Charge Carriers, Reactive Oxygen Species and Antibacterial Activity
摘要： Increasing the photocatalytic activity of semiconductors by forming heterojunctions with metal improves their energy transfer efficiency and environmental remediation capabilities. However, our knowledge regarding the structure-activity relationship of semiconductor/metal hybrid nanostructures is lacking due to poor control over their physicochemical properties. Here, we report a facile way to make ZnO/metal heteronanoparticles by mixing/irradiation process of ZnO and metal nanoparticles. The resultant products provide an expedient model to explore the effects of various metal NPs on light-induced electron/hole separation, reactive oxygen species (ROS) production and antibacterial activities of ZnO NPs. Electron spin resonance spectroscopy was used to compare the effect of mixing Pt, Au, or Ag NPs at different size and concentration with ZnO NPs on light-induced electron-hole separation and ROS production. The enhancing effect of metal NPs depends on particle size, composition, and mass ratio of the metal NPs to the ZnO NPs. Smaller-sized Pt NPs are more efficient in promoting charge carrier generation and ROS production. At 5 nm, Ag NPs promoted charge carrier generation more efficiently than Pt and Au NPs, but Pt NPs promoted ROS generation more efficiently than Au and Ag NPs. These results provide valuable strategy to design the synthesis of semiconductor/metal hybrid nanostructures and easy tailoring of ROS and charge carrier production.
关键词： reactive oxygen species,photocatalytic activity,metal nanoparticles,antibacterial activity,ZnO
更新于2025-09-04 15:30:14
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Antibacterial and photocatalytic activity of hydrothermally synthesized SnO2 doped GO and CNT under visible light irradiation
摘要： Bacterial and dye pollution are major problems with wastewater treatment. An increasing number of photocatalysts are being used in industry to kill bacterial and reduce pollution. In the present study, highly stable SnO2-doped nanocomposites have been prepared successively by a hydrothermal method. The synthesized nanocomposite was characterized using a range of techniques, such as X-ray diffraction, field emission scanning electron microscopy with energy dispersive X-ray spectroscopy and electron probe micro analysis, ultraviolet–visible spectroscopy, Fourier transform infrared spectroscopy, and high resolution transmission electron microscopy (HR-TEM). The nanocomposites showed significant dose-dependent bactericidal activity in the disc diffusion assay and cell viability test. The S-GO-SnO2 200 μg/mL produced a cell viability of 184.3 ± 11.71 and 172.3 ± 3.05 × 106 CFU/mL for E. coli and P. graminis, respectively. The S-GO-SnO2 showed significant photocatalytic degradation against MB in 120 min. The photocatalyst S-GO-SnO2 showed 159 and 161 × 106 CFU/mL at 150 min in E. coli and P. graminis, respectively. The cells treated with photocatalytic SnO2-doped nanocomposites showed 50% cell death. HR-TEM revealed 50% cell growth inhibition by bacterial damage. This photocatalytic SnO2-doped nanocomposite is a good candidate for treating industrial wastewater treatment contaminated with dyes and bacteria.
关键词： Antibacterial activity,Photocatalytic activity,Hydrothermal syntheses,Visible light irradiation,SGO-SnO2,SCNT-SnO2
更新于2025-09-04 15:30:14