scholarly journals Structural, Optical, Magnetic, Photocatalytic Activity and Related Biological Effects of CoFe2O4 Ferrite Nanoparticles

2021 ◽  
Author(s):  
B. Yalcin ◽  
S. Ozcelik ◽  
K. Icin ◽  
K. Senturk ◽  
B. Ozcelik ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Biological Effects ◽  
Spherical Shape ◽  
Biological Properties ◽  
Heme Iron ◽  
Morphological Properties ◽  
Precipitation Method ◽  
Sem Images ◽  
Potential Applications ◽  
Co Precipitation

Abstract The synthesis of magnetic nano-size spinel ferrites has become an important area of research, due to their several potential applications. In this work, CoFe2O4 nanoparticles were synthesized by the co-precipitation method. Structural, magnetic and photocatalytic properties of cobalt ferrites were analyzed based on their chemical composition considering their biological properties. Structural and morphological properties were investigated by X-ray diffraction analysis (XRD) and SEM respectively. Lattice parameters and cell volumes were calculated from XRD data. SEM images revealed uniform surface morphology and spherical shape of nanoparticles. Magnetization measurements were measured by using Lake Shore 7304 model Vibrating Sample Magnetometer. In hemolytic activity tests, formation of a precipitate with a characteristic black color provided an explicit evidence to the formation of heme-iron complexes. Undesirable hemolytic effect of CoFe2O4 nanoparticles on human erythrocytes at both concentrations was attributed to the comparatively high amount of reactive oxygen species formed by CoFe2O4 nanoparticles. The theoretical concentration Co (theory) obtained by second-order model (0.82 mg/L) fit with the experimental value of Co (experimental) (0.95 mg/L) well in photocatalytic activity tests.

scholarly journals BIODEGRADABLE GELATIN DECORATED Fe3O4 NANOPARTICLES FOR PACLITAXEL DELIVERY

2018 ◽  
Vol 55 (1B) ◽  
pp. 7 ◽  
Author(s):  
Dai Hai Nguyen
Keyword(s):  
Fe3o4 Nanoparticles ◽  
Drug Loading ◽  
Spherical Shape ◽  
Average Diameter ◽  
Precipitation Method ◽  
Loop Analysis ◽  
Transmission Electron ◽  
Potential Applications ◽  
Size And Morphology ◽  
Co Precipitation

The objective of this study is to prepare biodegradable iron oxide nanoparticles with gelatin (GEL) for paclitaxel (PTX) delivery. In detail, Fe3O4 nanoparticles were prepared and then coated them with GEL (Fe3O4@GEL) conjugate by co–precipitation method. Furthermore, the formation of Fe3O4@GEL was demonstrated by Fourier transform infrared (FT–IR) and powder X–ray diffraction (XRD). The superparamagnetic property of Fe3O4@GEL was also showed by hysteresis loop analysis, the saturation magnetization reached 20.36 emu.g–1. In addition, size and morphology of Fe3O4@GEL nanoparticles were determined by transmission electron microscopy (TEM). The results indicated that Fe3O4@GEL nanoparticles were spherical shape with average diameter of 10 nm. Especially, PTX was effectively loaded into the coated magnetic nanoparticles, 86.7 ± 3.2 % for drug loading efficiency and slowly released up to 5 days. These results suggest that the potential applications of Fe3O4@GEL nanoparticles in the development of stable drug delivery systems for cancer therapy.

scholarly journals Photocatalytic Performances and Antibacterial Activities of Nano-Zno Derived By Cetrimide-Based Co-Precipitation Method by Varying Solvents

2019 ◽  
Vol 9 (2) ◽  
pp. 930-938
Keyword(s):  
Dye Degradation ◽  
Uv Light ◽  
Cost Effective ◽  
Antibacterial Activities ◽  
Precipitation Method ◽  
Zno Nanostructures ◽  
Sem Images ◽  
Potential Applications ◽  
Powder Samples ◽  
Co Precipitation

In this work, zinc oxide nanoparticles have been synthesized by cost-effective and based on the efficient cetrimide and varying solvents are using the method of co-precipitation annealing at 350 C. The resultant powder samples were characterized well by means of XRD, SEM, FT-IR, PL and UV-visible DRS spectroscopy. Among them, XRD exhibits ZnO has the structure of hexagonal wurtzite with a preferred orientation of 101 planes. It is noted in ZnO represented in SEM images have different solvents and cetrimide has a strong influence on the morphology of ZnO nanostructures that are to be sized are 50nm, 70nm, 90nm 100nm. It confirms that the changes in the band-gap from UV-vis DRS data. The presence of Zn-O confirms various functional groups decomposed in the sample from FTIR data. The PL study states that the emission band available at approximately 410nm and checks the recombination level shows low, further, it correlates with good photocatalytic properties. The sunlight measured by Lux meter and dye degradation studies is done by a simple aeration photocatalytic technique represents 95% degradations and under UV light is 85%. Besides, the scavengers of the responsive species of during the degradation were additionally examined for photocatalytic mechanism. An antibacterial activity is enhanced significantly, which is based on the attribution of Nano features of ZnO nanostructures for p. aeruginosa bacteria. Thus, this study paved the way for potential applications of photocatalytic and antibacterial activities.

Photocatalytic Activity of Fe-Doped ZnO/Montmorillonite Nanocomposite for Degradation of Malachite Green

2015 ◽  
Vol 827 ◽  
pp. 19-24 ◽  
Author(s):  
Nur Afifah ◽  
Nadia Febiana Djaja ◽  
Rosari Saleh
Keyword(s):  
Photocatalytic Activity ◽  
Malachite Green ◽  
Organic Dyes ◽  
Uv Light ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spin Resonance ◽  
Doped Zno ◽  
Co Precipitation

In this study, the photocatalytic activity of pure Fe- doped ZnO and Fe- doped ZnO/Montmorillonite nanocomposite has been investigated for the degradation of malachite green under UV light irradiation. Both photocatalysts were synthesized using co-precipitation method and characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, Fourier-transform infrared absorption, and electron spin resonance. The results showed that the photocatalytic efficiency is better in the presence of montmorillonite compared to pure Fe- doped ZnO. To detect the possible reactive species involved in degradation of organic dyes control experiments with introducing scavengers into the solution of organic dyes were carried out. It is found that electron plays an important role in the degradation of malachite green.

Synthesis of Silica Modified Large-Sized Hydroxyapatite Whiskers by a Hydrothermal Co-Precipitation Method

2015 ◽  
Vol 645-646 ◽  
pp. 1339-1344 ◽  
Author(s):  
Yan Ting Yin ◽  
Qing Hua Chen ◽  
Ting Ting Yan ◽  
Qing Hua Chen
Keyword(s):  
Bone Repair ◽  
Ethanol Solution ◽  
Morphological Properties ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
New Type ◽  
Ft Ir ◽  
Co Precipitation ◽  
Surface Modified

The objective of this study was to develop a novel silica modified large-sized hydroxyapatite whiskers with improved properties for use in bone repair applications. Large-sized whiskers with a mean length of 250μm were obtained by a hydrothermal co-precipitation method at 150°C, 7.5Mpa in high-pressure reactor. Silica modified hydroxyapatite whiskers were prepared by dissolving TEOS in ethanol solution, then sintering with hydroxyapatite. The compositional and morphological properties of prepared whiskers were studied by means of x-ray diffraction (XRD), Fouier transform infrared (FT-IR), scanning electron microscopy (SEM). The results indicated the evidence of nanosilicon dioxide particles on the surface of HAP whiskers. The size of nanosilicon dioxide particles depends on dropping and stirring rate. Hence, this new type of silica modified large-sized hydroxyapatite whiskers is a valuable candidate for biomedical applications.Key words: hydroxyapatite, hydrothermal co-precipitation, surface modified, whiskers

Application of Optimised Nanocarbon Materials and Biofertilisers as a Potent Superfertiliser: Towards Sustainable Agriculture Production

2021 ◽  
Vol 13 (5) ◽  
pp. 812-819
Author(s):  
Mohamed Helmi Hadj Alouane ◽  
Faheem Ahmed ◽  
Nermin Adel Hussein El Semary ◽  
Munirah F. Aldayel ◽  
Fatimah H. Alhaweti ◽  
...  
Keyword(s):  
Environmental Sustainability ◽  
Carbon Nanomaterials ◽  
Growth Parameters ◽  
Precipitation Method ◽  
Great Promise ◽  
Sem Images ◽  
Nanocarbon Materials ◽  
Co Precipitation ◽  
Carbon Based Nanomaterials ◽  
Dose Dependent

In this work, carbon-based nanomaterials including; carbon nanotubes (CNT) and graphene were combined with biofertilisers and tested their impact on germination of Hordeum vulgare. The interaction between nanomaterials and biofertilisers was analysed. Scanning electron microscopy (SEM) images revealed that the surface of algal cells was covered with carbon nanomaterials including graphene and CNTs. Raman studies showed the characteristic band of graphene, CNTs and Algal cells. The combination of carbon nanomaterials with biofertilizers resulted in significantly better growth than with nanomaterials individually. To prepare a more effective superfertiliser, zinc ferrites (ZnFe2O4) nanoparticles were added to the nanomaterials-biofertilisers combination. These zinc ferrites nanofertilisers had a size ranging from 8–12 nm and were prepared by co-precipitation method and used at two different doses. The results showed that the growth parameters were increased most significantly with addition of 0.25 ml of ZnFe2O4 nanoparticles. Increasing the dose caused a less increase in growth parameters. These results indicated that increase in growth parameters was dose-dependent. These results demonstrated a great promise for novel formulation of superfertiliser that significantly enhanced plant growth without pollution or excessive use of harmful chemicals for better food security and environmental sustainability.

Anatomy of a Natural Sunlight Driven CdS/CoTiO3/ZnO Ternary Photocatalyst for Efficient Optical Properties and Removal of Reactive Orange 30

2021 ◽  
Vol 25 (8) ◽  
pp. 100-109
Author(s):  
G. Divya ◽  
D. Sakthi ◽  
A. Priyadharsan ◽  
S. Boobas ◽  
S. Sivakumar
Keyword(s):  
Electron Transfer ◽  
Photocatalytic Activity ◽  
Potential Gradient ◽  
Spatial Separation ◽  
Morphological Properties ◽  
Photoexcited Electron ◽  
Visible Absorption ◽  
Potential Applications ◽  
The Difference ◽  
Reactive Orange

ZnO as a promising photocatalyst has gained much attention for the removal of organic pollutants from water. However, the main drawbacks of the relatively low photocatalytic activity and high recombination rate of photoexcited electron-hole pairs restrict its potential applications. Promoting the spatial separation of photoexcited charge carriers is of paramount significance for photocatalysis because the difference in the band positions makes the potential gradient at the composite boundary. In this work, binary CdS/ZnO and CoTiO3/ZnO are first prepared by dispersion method and then decorated with ZnO particles to construct CdS/CoTiO3/ZnO ternary composites. For this reason, the CdS/CoTiO3/ZnO ternary composites was effectively designed and analyzed for the crystalline structure, light absorption, photoexcitation behavior and surface morphological properties by X-ray diffraction, diffuse reflectance UV/visible absorption spectroscopy, photoluminescence spectroscopy and scanning electron micrograph respectively. The photocatalytic activity was examined by degradation of the dye solution spectrophotometrically. The results of photocatalytic degradation indicated that the CdS/CoTiO3/ZnO ternary composites are much higher than those of bare CdS, CoTiO3, ZnO and any binary composites such as CoTiO3/ZnO and ZnO/CdS. The enhanced activity could be attributed to the drop electron transfer from CdS to ZnO to CoTiO3 through the interfacial potential gradient in the ternary hybrid conduction bands. The enhanced electron transfer of CdS/CoTiO3/ZnO ternary composites was also applicable to degrade other reactive dyes.

Calcium Carbonate and Cellulose/Calcium Carbonate Composites: Synthesis, Characterization, and Biomedical Applications

2016 ◽  
Vol 875 ◽  
pp. 24-44
Author(s):  
Ming Guo Ma ◽  
Shan Liu ◽  
Lian Hua Fu
Keyword(s):  
Calcium Carbonate ◽  
Biomedical Applications ◽  
Value Added ◽  
Functional Materials ◽  
Industrial Applications ◽  
Precipitation Method ◽  
Synthesis Methods ◽  
Water Pretreatment ◽  
Potential Applications ◽  
Co Precipitation

CaCO3 has six polymorphs such as vaterite, aragonite, calcite, amorphous, crystalline monohydrate, and hexahydrate CaCO3. CaCO3 is a typical biomineral that is abundant in both organisms and nature and has important industrial applications. Cellulose could be used as feedstocks for producing biofuels, bio-based chemicals, and high value-added bio-based materials. In the past, more attentions have been paid to the synthesis and applications of CaCO3 and cellulose/CaCO3 nanocomposites due to its relating properties such as mechanical strength, biocompatibility, and biodegradation, and bioactivity, and potential applications including biomedical, antibacterial, and water pretreatment fields as functional materials. A variety of synthesis methods such as the hydrothermal/solvothermal method, biomimetic mineralization method, microwave-assisted method, (co-) precipitation method, and sonochemistry method, were employed to the preparation of CaCO3 and cellulose/CaCO3 nanocomposites. In this chapter, the recent development of CaCO3 and cellulose/CaCO3 nanocomposites has been reviewed. The synthesis, characterization, and biomedical applications of CaCO3 and cellulose/CaCO3 nanocomposites are summarized. The future developments of CaCO3 and cellulose/CaCO3 nanocomposites are also suggested.

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