A rapid synthetic technique is investigated for magnetic nanoparticles (Co1−yCuyFe2−xCexO4 (x = 0, y = 0), (x = 0.05, y = 0), (x = 0, y = 0.5), and (x = 0.05, y = 0.5)). The structure, morphology, optical and magnetic performance of prepared nanoparticles are analyzed by powder XRD, XPS, FT-IR, SEM-EDAX, TEM, DRS, and VSM. The photocatalytic activity of the synthesized nanoparticles for the removal of the Congo red (CR) dye and bisphenol A (BPA) from aqueous solution is examined by UV–visible spectrometer. Research indicates that the co-doping of Cu2+ and Ce3+ showed marked effect on the structural, optical, magnetic, and photocatalytic properties of the CoFe2O4 nanoparticles. DRS showed that the Co0.5Cu0.5Fe1.95Ce0.05O4 nanoparticles have lower band gap energy (0.78 eV) than other synthesized compounds. High removal percentage of CR and BPA (99.09% and 99.33%) was observed within 30 min and 180 min under visible and UV–light illumination respectively using Co0.5Cu0.5Fe1.95Ce0.05O4. The corresponding photocatalytic degradation kinetics and mechanism are analyzed. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.

Sumathi S

Department of Chemistry

School of Advanced Sciences

Vellore Campus

Kirankumar V.S

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Environmental Science and Pollution Research

In this study, yttrium doped zinc ferrite (ZnFe2−xYxO4x = 0.01–0.1) and yttrium and copper co-doped zinc ferrite (CuyZn1−yFe2−xYxO4x = 0.1 and y = 0.5) were synthesized by solution combustion method. The synthesized nanoparticles were authenticated by various techniques such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy–energy dispersive X-ray analysis (SEM-EDAX) and UV–visible spectroscopy. The photocatalytic activity of synthesized nanoparticles was studied by performing the degradation of methylene blue (MB) under visible light. 95% of MB was degraded in 180 min using yttrium-doped zinc ferrite. 89% of MB was degraded in 30 min using copper and yttrium co-doped zinc ferrite under visible light using 10 mg of the catalyst and 50 µl of hydrogen peroxide. Photocatalytic degradation of colorless pollutant bisphenol A also carried out using the doped zinc ferrite. © 2019, Springer Science+Business Media, LLC, part of Springer Nature.

Journal of Materials Science: Materials in Electronics

Synthesis, characterization, optical and photocatalytic activity of yttrium and copper co-doped zinc ferrite under visible light

Herein we reported the photocatalytic and antibacterial activity of CoFe2O4, CoFe1.9Bi0.1O4 and Cu0.5Co0.5Fe1.9Bi0.1O4 nanoparticles obtained by solution combustion technique using glycine as a fuel. The obtained nanoparticles were analyzed by various techniques such as powder XRD, FTIR, UV-DRS and SEM-EDAX. The band gap value of CoFe2O4 nanoparticle is decreases gradually from 1.46 to 1.00 eV (CoFe1.9Bi0.1O4) and 0.85 eV (Cu0.5Co0.5Fe1.9Bi0.1O4) due to the doping of copper and bismuth. The photocatalytic activity of synthesized nanoparticles was evaluated for the degradation of congo red dye. 89 and 87% removal efficiency of congo red dye was achieved in 90 min under different light (UV and visible light) illumination utilizing 10 mg of Cu0.5Co0.5Fe1.9Bi0.1O4 catalyst. Antibacterial activity of the compounds was tested against two organisms Staphylococcus aureus and Escherichia coli by well diffusion method. Co-doping of copper and bismuth improved the antibacterial activity against the organisms S. aureus (29 mm) and E. coli (34 mm) when compared to cobalt ferrite. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.

Photocatalytic and antibacterial activity of bismuth and copper co-doped cobalt ferrite nanoparticles

Co1-xCuxFe2O4 nanoparticles with x = 0 and 0.5 were synthesized through the combustion method. The as-made materials are face centered-cubic close-packed spinel structures. The characterization techniques such as powder XRD, FTIR, UV-DRS and SEM studies collectively verified that the formed products are cobalt ferrite and copper substituted cobalt ferrite nanoparticles. In addition, the mean crystalline size, lattice parameter and band gap energy of nanoparticles are calculated. The photocatalytic activity of the obtained Co1-xCuxFe2O4 spinel nanoparticles is evaluated by monitoring the degradation of congo red under visible light irradiation. © Published under licence by IOP Publishing Ltd.

Fulltext

IOP Conference Series: Materials Science and Engineering

Photocatalytic degradation of congo red using copper substituted cobalt ferrite

Co1-xCuxFe2O4 (0 ≤ x ≤ 0.5) nanoparticles were prepared by the microwave combustion technique. The obtained samples were characterized using X-ray diffraction (XRD) analysis, X-ray photoelectron spectroscopy (XPS), high resolution scanning electron microscopy (HR-SEM), energy dispersive X-ray (EDX) analysis, UV-visible diffuse reflectance spectroscopy, photoluminescence (PL) spectroscopy, Fourier transformed infrared (FT-IR) spectroscopy and vibrating sample magnetometry. The XRD result confirms the formation of cubic spinel structure and the average crystallite size was observed to be in the range of 46-31 nm calculated by Debye Scherrer's equation. XPS analysis was carried out to study the chemical elements and oxidation states of the synthesized Co1-xCuxFe2O4 (0 ≤ x ≤ 0.5) nanoparticles. The HR-SEM image showed agglomerated spherical nanoparticles and the elemental composition of copper doped cobalt ferrite was attained from energy dispersive X-ray analysis. The band gap energy was calculated by diffuse reflectance spectroscopy. Photoluminescence spectra showed the rate of recombination of electron-hole pairs and presence of defects. The band at 661 and 569 cm-1 is due to the intrinsic stretching vibrations of octahedral group complex of Co2+-O2- and Fe3+-O2- at tetrahedral sites. Remanence magnetization (Mr), coercivity (Hc) and saturation magnetization (Ms) were deduced from the hysteresis curves. The obtained Co1-xCuxFe2O4 (0 ≤ x ≤ 0.5) nanoparticles were assessed for the photocatalytic degradation of RhB under visible light. A possible mechanism responsible for photocatalytic degradation process is discussed. © 2017 Elsevier Ltd. All rights reserved.

Journal of Environmental Chemical Engineering

Photocatalytic removal of rhodamine B under irradiation of visible light using Co1Cu Fe2O4 (0 ≤x≤ 0.5) nanoparticles

Cobalt ferrite, copper and bismuth co-substituted cobalt ferrite nanoparticles are prepared by solution combustion method. The synthesized compounds are authenticated by powder X-ray diffraction, Fourier transform infrared spectroscopy, Scanning electron microscopy-Energy dispersive X-ray analyser and Vibrating sample magnetometer. Particle size, lattice parameter, saturation magnetization and coercivity as a function of bismuth and copper substitution in cobalt ferrite nano particles are studied. Lattice parameter and dielectric constant are increased due to the substitution of bismuth in cobalt ferrite. Catalytic activity of the synthesized compounds are tested for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). The conversion of nitrophenol to amino phenol is achieved in seconds using the substituted cobalt ferrite compounds. © 2016, Springer Science+Business Media New York.

Structural, magnetic, electrical and catalytic activity of copper and bismuth co-substituted cobalt ferrite nanoparticles

In this study, cobalt ferrite and bismuth substituted cobalt ferrite (CoFe2−xBixO4 x=0, 0.1) nanoparticles were synthesized by two different methods viz combustion and co-precipitation. The nanoparticles were characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), diffuse reflectance spectroscopy (DRS), scanning electron microscopy-energy dispersive X-ray analyzer (SEM-EDX) and vibrating sample magnetometer (VSM). The results of powder XRD pattern showed an increase in lattice parameter and decrease in particle size of cobalt ferrite by the substitution of bismuth. Catalytic activity of cobalt ferrite and bismuth substituted cobalt ferrite nanoparticles synthesized by two different methods were compared for the reduction of 4-nitrophenol to 4-aminophenol using NaBH4 as a reducing agent. © 2016 Elsevier B.V.

Journal	Data powered by TypesetEnvironmental Science and Pollution Research
Publisher	Data powered by TypesetSpringer Science and Business Media LLC
ISSN	0944-1344
Open Access	0