scholarly journals Photodeposition of Silver on Zinc/Calcium Ferrite Nanoparticles: A Contribution to Efficient Effluent Remediation and Catalyst Reutilization

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 831
Author(s):  
Ricardo J. C. Fernandes ◽  
Carlos A. B. Magalhães ◽  
Ana Rita O. Rodrigues ◽  
Bernardo G. Almeida ◽  
Ana Pires ◽  
...  
Keyword(s):  
Azo Dyes ◽  
Magnetic Measurements ◽  
Sol Gel ◽  
Significant Loss ◽  
Ferrite Nanoparticles ◽  
Calcium Ferrite ◽  
Gel Method ◽  
Magnetic Recovery ◽  
Mixed Ferrite ◽  
Calcium Ferrites

The efficient photodegradation of textile dyes is still a challenge, especially considering resistant azo dyes. In this work, zinc/calcium mixed ferrite nanoparticles prepared by the sol–gel method were coupled with silver by a photodeposition method to enhance the photocatalytic potency. The obtained zinc/calcium ferrites are mainly cubic-shaped nanoparticles sized 15 ± 2 nm determined from TEM and XRD and an optical bandgap of 1.6 eV. Magnetic measurements indicate a superparamagnetic behavior with saturation magnetizations of 44.22 emu/g and 27.97 emu/g, respectively, for Zn/Ca ferrite and Zn/Ca ferrite with photodeposited silver. The zinc/calcium ferrite nanoparticles with photodeposited silver showed efficient photodegradation of the textile azo dyes C.I. Reactive Blue 250 and C.I. Reactive Yellow 145. Subsequent cycles of the use of the photocatalyst indicate the possibility of magnetic recovery and reutilization without a significant loss of efficiency.

scholarly journals Magnetic Nanoparticles of Zinc/Calcium Ferrite Decorated with Silver for Photodegradation of Dyes

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3582 ◽  
Author(s):  
Ricardo J. C. Fernandes ◽  
Carlos A. B. Magalhães ◽  
Carlos O. Amorim ◽  
Vítor S. Amaral ◽  
Bernardo G. Almeida ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Optical Band Gap ◽  
Magnetic Measurements ◽  
Ferrite Nanoparticles ◽  
Calcium Ferrite ◽  
Size Estimation ◽  
Visible Absorption ◽  
Uv Visible ◽  
Calcium Ferrites ◽  
Reactive Red 195

Magnetic nanoparticles of zinc/calcium ferrite and decorated with silver were prepared by coprecipitation method. The obtained nanoparticles were characterized by UV/Visible absorption, XRD, TEM and SQUID. The mixed zinc/calcium ferrites exhibit an optical band gap of 1.78 eV. HR-TEM imaging showed rectangular nanoplate shapes with sizes of 10 ± 3 nm and aspect ratio mainly between 1 and 1.5. Magnetic measurements indicated a superparamagnetic behavior. XRD diffractograms allowed a size estimation of 4 nm, which was associated with the nanoplate thickness. The silver-decorated zinc/calcium ferrite nanoparticles were successfully employed in the photodegradation of a model dye (Rhodamine B) and industrial textile dyes (CI Reactive Red 195, CI Reactive Blue 250 and CI Reactive Yellow 145). The nanosystems developed exhibited promising results for industrial application in effluent photoremediation using visible light, with the possibility of magnetic recovery.

scholarly journals Superparamagnetic calcium ferrite nanoparticles synthesized using a simple sol-gel method for targeted drug delivery

2015 ◽  
Vol 26 (s1) ◽  
pp. S103-S110 ◽  
Author(s):  
N.H. Sulaiman ◽  
M.J. Ghazali ◽  
B.Y. Majlis ◽  
J. Yunas ◽  
M. Razali
Keyword(s):  
Drug Delivery ◽  
Targeted Drug Delivery ◽  
Sol Gel ◽  
Ferrite Nanoparticles ◽  
Calcium Ferrite ◽  
Gel Method ◽  
Sol Gel Method ◽  
Targeted Drug

Consequence of pH variation on the dielectric properties of Cr-doped lithium ferrite nanoparticles synthesized by the sol–gel method

2015 ◽  
Vol 645 ◽  
pp. 171-177 ◽  
Author(s):  
Manish Srivastava ◽  
R.K. Mishra ◽  
Jay Singh ◽  
Neha Srivastava ◽  
Nam Hoon Kim ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Sol Gel ◽  
Ferrite Nanoparticles ◽  
Lithium Ferrite ◽  
Ph Variation ◽  
Gel Method ◽  
Sol Gel Method

Enhanced Magnetic and DC Electrical Properties of Sm-Doped Bi2Fe4O9 Nanoplates Synthesized by Sol–Gel Method

NANO ◽  
2020 ◽  
Vol 15 (02) ◽  
pp. 2050020 ◽  
Author(s):  
E. M. M. Ibrahim ◽  
G. Farghal ◽  
Mai M. Khalaf ◽  
Hany M. Abd El-Lateef
Keyword(s):  
Magnetic Measurements ◽  
Small Polaron ◽  
Sol Gel ◽  
Electric Transport ◽  
X Ray Diffraction ◽  
Polaron Hopping ◽  
Gel Method ◽  
Sol Gel Method ◽  
High Temperature Measurement ◽  
Ferromagnetic Ordering

In this work, Bi[Formula: see text]SmxFe4O9 ([Formula: see text], 0.02, 0.06, 0.08, 0.1) nanoplates with an average thickness of 62–125[Formula: see text]nm were synthesized using a sol–gel method. The samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. The magnetic measurements show that the nanoplates have weak ferromagnetic ordering. The saturation magnetization of the nanoplates increases as the Sm content increases. The DC electric transport properties were studied by measuring the temperature dependence of the resistivity in the temperature range 300–680[Formula: see text]K. The materials show typical semiconductor features, and the conduction mechanisms are governed by electron and small polaron hopping in the low and high temperature measurement ranges, respectively. The Sm doping results in a significant enhancement in the electrical conductivity of the Bi2Fe4O9 nanoplates.

scholarly journals Optimization of the Synthesis of Copper Ferrite Nanoparticles by a Polymer-Assisted Sol–Gel Method

ACS Omega ◽  
2019 ◽  
Vol 4 (19) ◽  
pp. 18289-18298 ◽  
Author(s):  
Jaume Calvo-de la Rosa ◽  
Mercè Segarra
Keyword(s):  
Sol Gel ◽  
Ferrite Nanoparticles ◽  
Copper Ferrite ◽  
Gel Method ◽  
Sol Gel Method

scholarly journals Size Effects on Magnetic Properties ofNi0.5Zn0.5Fe2O4Prepared by Sol-Gel Method

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Min Zhang ◽  
Zhenfa Zi ◽  
Qiangchun Liu ◽  
Peng Zhang ◽  
Xianwu Tang ◽  
...  
Keyword(s):  
Particle Size ◽  
Magnetic Measurements ◽  
Sol Gel ◽  
Domain Wall Motion ◽  
Blocking Temperature ◽  
Particle Sizes ◽  
X Ray Diffraction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Cation Redistribution

Ni0.5Zn0.5Fe2O4particles with different particle sizes have been synthesized by sol-gel method. X-ray diffraction results show that all the samples are pure cubic spinel structure with their sizes ranging from 9 to 96 nm. The lattice constant significantly decreases with further increasing annealing temperature. The magnetic measurements show superparamagnetic nature below the particle size of 30 nm, while others show ferrimagnetic nature above the corresponding blocking temperature. The blocking temperature increases with the increase in particle size, which can be explained by Stoner-Wohlfarth theory. The saturation magnetization increases as the particle size increases, which can be explained by the cation redistribution on tetrahedral A and octahedral B sites and the domain wall motion. The variation of coercivity as a function of particle size is based on the domain structure.

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