Antimicrobial, electrochemical and photo catalytic activities of Zn doped Fe 3 O 4 nanoparticles (original) (raw)
Related papers
Materials Science in Semiconductor Processing, 2018
Fe doped ZnO nanoparticles with varying Fe concentrations 1-17% were fabricated by sol-gel route. Fouriertransform infrared spectrometer (FTIR) study established Fe doping and incorporation of Fe in ZnO lattice. X-ray diffraction (XRD) results indicated that the synthesized nano-particles were poly-crystalline with the hexagonal wurtzite structure. No impurity or iron compound peak was foud. The band gap of the synthesized nano-particles was observed to increase with the increase of Fe percentage and hence displayed a blue shift but the band gap of Fe doped ZnO is lesser than the band gap of undoped ZnO. Magnetic study assured a ferromagnetic trend for all the synthesized nano-particles due to Fe doping in ZnO. The effects of Fe percentage on the antibacterial efficiency against two different bacteria Escherichia coli (E.coli) and Pseudomonas aeruginosa (P. aeruginosa) were probed. The antibacterial efficiency was best for 14 and 17 at% of the Fe doping level. Photocatalytic activity was determined by degradation of methylene blue (MB) dye in ethanol solution under sunlight. ZnO with 1% Fe showed the better photo-catalytic property.
Photocatalytic and Antibacterial Performance of α-Fe2 O3 Nanostructures
ChemistrySelect, 2017
Morphology engineered a-Fe 2 O 3 nanostructures with magnificent antibacterial property and excellent photocatalytic activity have been presented to address the long-standing environment issue. After tuning the morphology via solvothermal route the products were characterized by morphological, structural and elemental analysis. The visible-light photocatalytic activity of a-Fe 2 O 3 nanostructures was evaluated by using them to degrade methylene blue (MB) dye under visible light irradiation in the presence of H 2 O 2. Amidst the series, nano bead-like structure exhibited the greatest activity toward MB degradation with 90 % degradation efficiency. Unique bead-like structure having fluctuant diameter is thought to play a key role in the enhanced separation of electron-hole pairs of a-Fe 2 O 3 and results superior photocatalytic activity. On the other hand all the shape variants of a-Fe 2 O 3 nanostructures showed brilliant antibacterial effect against Gram negative (Escherichia coli) bacterium. Based on the current findings, the presented a-Fe 2 O 3 nanostructures with their superb photocatalysis and antibacterial activity can be a promising candidate for industry to abate the ever rising environmental threat.
Antimicrobial and Photocatalytic Properties of Doped and Undoped Zinc Oxide Nanoparticles
Contemporary Materials, 2020
In this paper, zinc oxide nanoparticles doped with copper (ZnO/CuNP) were synthesized by using black and green tea, vitamin C and trisodium citrate as a reduction agent. Antimicrobial and photocatalytic properties were tested. The antimicrobial activity of the doped synthesized ZnO NP against the clinical isolates of Acinetobacter baumannii and methicillin resistant Staphylococcus aureus (MRSA) was performed by the agar well diffusion method. ZnO NP with all four reduction agents showed good antimicrobial efficiency against both microorganisms, with similar inhibition zone. Photocatalytic activity was more pronounced in case of undoped, pure ZnO nanoparticles, while the best results for doped ZnO samples were obtained for ZnO/Cu NPs using black tea.
International Journal of Innovative Research in Science, Engineering and Technology, 2015
Pure and co-doped ZnO nanoparticles were synthesized by microwave combustion method using urea as a fuel. Structural, optical, morphological and magnetic property was studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectra. X-ray diffraction measurements of the nanoparticles showed the same wurtzite hexagonal structure and preferential orientation along the c-axis. The scanning electron microscope image of the nanoparticles revealed an average particle size of 47-23 nm. The calculated results from DRS spectroscopy indicated that the band gap of the synthesized samples decreased with the increment of the concentration of co-dopant, which resulted in the red-shift. The photoluminescence (PL) studies revealed that violet, blue and green emissions. The well diffusion method was used for antibacterial activities of two Gram negative and three Gram positive bacterial pathogens. The doping with Ce...
Green synthesis of ZnO nanoparticles and their photocatalyst degradation and antibacterial activity
Journal of Water and Environmental Nanotechnology, 2022
The current study aimed to synthesize nanoparticles of Zinc oxide (ZnO) using the extract of Acalypha indica leaves and their photocatalyst degradation and antibacterial properties were also measured. The biosynthesized nanoparticles were analyzed using XRD, UV-visible, FT-IR, and SEM with EDAX, DLS, PL, and Zeta potential analysis. The synthesized nanoparticles had a mean size of 16 nm measured by XRD which was highly pure, and their spherical shape was confirmed by SEM. The UV-visible confirmed that ZnO nanoparticles have a direct band gap energy is 3.34 eV. The measured zeta size and potential of synthesized nanoparticles were 46 nm and -27 mV, respectively, determined by the DLS technique can be considered moderately stable colloidal solutions. The FT-IR analysis confirmed the presence of functional groups in the leaf extract and the ZnO nanoparticles. The biosynthesized ZnO nanoparticles have a homogeneous spherical morphology and the average particle is 35 nm. The PL analyses performed on synthesized nanoparticles showed a sharp blue band at 362 nm, which was attributed to the defects of structure in ZnO crystals. During natural sunlight illumination, ZnO nanoparticles demonstrated notable degradation of the dye methyl blue (MB). At 90 min of illumination, the degradation efficiency achieved was 96 %. Antibacterial properties were observed for synthesized nanoparticles against four bacterial strains, including Bacillus subtilis, Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli. The highest zone of inhibition was observed against Escherichia coli (25.2 mm). Overall, these studies indicate that Acalypha indica is a good sell for planting, and has the greatest chance of being used to develop nanoparticles for protection against environmental pollution and human health.
Structural , Photocatalytic and Antibacterial Activity of ZnO and ZrO 2 Doped ZnO Nanoparticles
2014
A series of ZnO and ZrO2 doped ZnO catalysts were prepared by sol-gel method. X-ray diffraction analysis of these catalysts showed the formation of phase pure nanoparticles with wurtzite ZnO structure. Scanning electron microscope (SEM) images emphasized the formation of spherical shaped ZnO and ZrO2 doped ZnO nanoparticles. Transmission electron microscope (TEM) images emphasized that all prepared catalysts are in nanoscale and are spherically shaped. The Methylene Blue (MB) decomposition rate of the synthesized pure ZnO and ZrO2 doped ZnO nanoparticles were studied under the UV–Vis region. In the UV–Vis region, synthesized pure ZnO and ZrO2 doped ZnO decomposed Methylene Blue (MB). However, the MB decomposition rate obtained using pure ZnO was much higher than that by doped ZnO. The antibacterial property test was carried out via disk diffusion method, and the result indicated antibacterial activity of the prepared catalysts.
Photocatalytic activity of Fe doped ZnS nanoparticles and carrier mediated ferromagnetism
Journal of Environmental Chemical Engineering, 2015
ZnS nanoparticles (ZnS NPs) with different amount of Fe as dopant ions had been synthesized. X-ray diffraction (XRD) and energy dispersive X-ray (EDX) analysis were carried out for particle size, phase and elemental analyses. Transmission electron microscopy (TEM) was employed for morphological studies. Defect chemistry and the photo-processes occurring in the material were understood by using UV-vis absorption and photoluminescence (PL) spectroscopy. The synthesized nanoparticles were evaluated as photocatalyst for the degradation of rhodamine B (RhB) dye in an aqueous solution illuminated by high pressure mercury vapour (HPMV) lamp at RT. In this study, we have shown that architecture of the photocatalyst is important to achieve optimum performance. By Mössbauer spectroscopy and vibrating sample magnetometry (VSM), it has been established that not only the locations of the dopant but also their oxidation states are critical for charge carrier dynamics. Charge carriers can be trapped and directed towards the adsorbed dye molecules by changing the oxidation state of the dopant Fe ions. On the basis of electrochemical analyses (cyclic voltammetry, Mott-Schottky plots and electrochemical impedance spectroscopy) it has been shown that dopant increases the level of charge carriers (electrons) in the material responsible for ferromagnetism at RT. Efficient catalytic recovery can be achieved if the photocatalytic material possesses ferromagnetic property.
ZnFe2O4 nanoparticle: Synthesis and photocatalytic activity under UV-Vis and visible lightI
In the present work, the ZnFe 2 O 4 nanoparticle has been successfully synthesized. The obtained sample was characterized by X-ray diffraction (XRD) and emission scanning electron microscopy (FE-SEM) and its optical property were examined by UV-Vis spectrophotometer. FE-SEM revealed that the particle size of the ZnFe 2 O 4 of about 47 nm was synthesized. The photocatalytic performance under UV-Vis and visible light was evaluated by decolorization of congo red (CR) anionic dye solution. The UV-Vis and visible light irradiation source consist of a high pressure mercury lamp 400 W and filament tungsten lamp 100 W respectively. The photocatalytic results show that the ZnFe 2 O 4 sample can degrade (CR) dye solution up to 100% after 30 and 120 min under UV-Vis and visible irradiation respectively.
Materials Science and Applied Chemistry
Spinel ZnFe2O4 was developed successfully as a heterogeneous-Fenton catalyst for the degradation of Reactive Yellow 86 (RY 86) under UV light. The ZnFe2O4 was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM) and UV-diffuse reflectance spectroscopy (UV-DRS). FE-SEM reveals that the some of the particles sizes are in the range from 10 nm to 50 nm. The photocatalytic performance of ZnFe2O4 was evaluated by degradation of RY 86 dye solution under UV light. The degradation rate was highly influenced by pH, initial concentrations of H2O2 and catalyst concentration. The results indicated that ZnFe2O4 could be used as a photocatalyst for treatment of industrial coloured wastewater. The catalyst was reused for five consecutive runs without significant change in its activity. Moreover, the antibacterial effects were investigated.
Egyptian Journal of Physics, 2022
The present work employs Ocimum Basilicum extract as a bio-reducing and a capping agent to synthesize zinc oxide nanoparticles (ZnO NPs) at different temperatures (30 o C, 6 0 o C, and 90 o C) in an efficient, simple, and environmentally friendly method (green synthesis), as well as their use in treating wastewater and antibacterial activity. The samples have a hexagonal structure confirmed by the X-ray Diffraction (XRD), and by using the Scherrer equation, the particle size was calculated. UV-Visible diffuse reflectance spectroscopy reveals the characteristic absorbance peak at 373 nm and gives the band gap nearly 3.23 eV for synthesized (ZnO NPs) due to the quantum confinement effect. Transmission electron microscopy (TEM) shows spherical-shaped particles. The products (ZnO-NPs) have a good effect on antibacterial activity against different types of bacteria. After 7 hours, the degradation rate of methylene blue (MB) dye by synthesized ZnO-NPs as a photocatalyst is 92.28 % from ZnO NPs synthesized at 30 oC.