In the current research, ZnFe2O4, Zn0.50Cu0.50Fe2O4, ZnFe1.90Bi0.10O4, ZnFe1.95Ce0.05O4, Zn0.50Cu0.50Fe1.90Bi0.10O4 and Zn0.50Cu0.50Fe1.95Ce0.05O4 magnetic nanoparticles were synthesized to remove the BPA (bisphenol A) from contaminated water through photocatalytic performance. The synthesized nanoparticles were characterized by powder XRD, UV-DRS, FT-IR, SEM-EDAX, VSM and XPS. From the XRD results it was observed that the particle size ranged from 38.26 to 30.18 nm. UV-DRS showed the band gap value ranging from 1.94 to 1.04 eV for the fabricated magnetic nanoparticles. Under 250 W UV-light irradiation, degradation of BPA using Zn0.50Cu0.50Fe1.90Bi0.10O4 and Zn0.50Cu0.50Fe1.95Ce0.05O4 nanoparticles were 90.09 and 91.25% in 180 min with the rate constant of (k) 0.02250 and 0.02365 min−1, respectively. The reactive species responsible for photocatalytic degradation were hydroxy radicals and superoxide radicals. 87.89% and 88.91% of degradation was observed after three cycles using Zn0.50Cu0.50Fe1.90Bi0.10O4 and Zn0.50Cu0.50Fe1.95Ce0.05O4 nanoparticles. The outcomes indicated that Zn0.50Cu0.50Fe1.90Bi0.10O4 and Zn0.50Cu0.50Fe1.95Ce0.05O4 nanoparticles show good stability for BPA degradation. © 2019 Taiwan Institute of Chemical Engineers

Sumathi S

Department of Chemistry

School of Advanced Sciences

Vellore Campus

Venkat Savunthari K

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

Journal of the Taiwan Institute of Chemical Engineers

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.

Journal of Materials Science: Materials in Electronics

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

Biocompatible magnetic semiconductor Zn1−xMgxFe2O4 (x = 0, 0.1, 0.3, 0.5 &amp; 0.7) nanoparticles of around 10 nm diameter were synthesized by solvothermal reflux method. The method produces well separated and narrow size distributed nanoparticles. Crystal structure, morphology, particles surface properties, surfactant quantity, colloidal stability, magnetic properties and photocatalytic properties of the synthesized nanoparticles were studied. Different characterizations confirmed that all compounds were single crystals and superparamagnetic at room temperature. Saturation mass magnetization (Ms = 57.5 emu/g) enhances with substituent Mg2+ concentration due to promotion of mixed spinel (normal and inverse) structure. Photocatalytic activity of all synthesized magnetic semiconductor nanoparticles were studied through methylene blue degradation. The degradation of 98% methylene blue was observed on 60 min irradiation of light. It is observed that photocatalytic activity slightly enhances with substituent Mg2+ concentration. The synthesized biocompatible magnetic semiconductor nanoparticles can be utilized as photocatalysts and could also be recycled and separated by applying an external magnetic field. © 2017 Elsevier B.V.

Journal of Photochemistry and Photobiology B: Biology

Magnetic and photocatalytic studies on Zn1−xMgxFe2O4 nanocolloids synthesized by solvothermal reflux method

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

Co1-xMgxFe2O4 (0≤x≤0.5) spinel nanoparticles were synthesized by a simple microwave combustion method. The characterization of the samples were performed using X-ray diffraction (XRD) analysis, scanning electron (SEM) microscopy, energy dispersive X-ray (EDX) analysis, UV–visible and diffuse reflectance (DRS) spectroscopy, photoluminescence (PL) spectroscopy, Fourier transformed infrared (FT-IR) spectroscopy and vibrating sample magnetometry (VSM) analysis. The XRD patterns indicate the formation of cubic inverse spinel structure. The calculated average crystallite size using Debye Scherrer's equation is found to be around 46–38 nm. The morphology of spinel nanoparticles was observed from SEM images and the elemental mapping of magnesium doped cobalt ferrite was obtained by using energy dispersive X-ray technique. Optical studies were carried out for the deeper understanding of the conduction band (CB) and valence band (VB) edges of the synthesized nanoparticles. The intrinsic stretching vibrations of Fe3+-O2- in tetrahedral sites leads to the appearance of IR band at around 573 cm−1. The magnetic properties such as remanence magnetization (Mr), coercivity (Hc) and saturation magnetization (Ms) were calculated from the hysteresis curves. The maximum photocatalytic degradation efficiency for Co0.6Mg0.4Fe2O4 is around (99.5%) when compared to that of CoFe2O4 whose efficiency is around (73.0%). The improvement in photocatalytic degradation efficiency is due to the effective separation and prevention of electron-hole pair recombination. The R2 values for the first order rate kinetics are found to be better than R2 values for the second order rate kinetics and this proves that photocatalytic degradation of RhB dye follows first order kinetics. The probable mechanism for the photocatalytic degradation of RhB dye is proposed. © 2017 Elsevier Ltd

Journal of Physics and Chemistry of Solids

Visible light driven photocatalytic degradation of rhodamine B using Mg doped cobalt ferrite spinel nanoparticles synthesized by microwave combustion method

Journal	Data powered by TypesetJournal of the Taiwan Institute of Chemical Engineers
Publisher	Data powered by TypesetElsevier BV
ISSN	1876-1070
Open Access	0