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.

Krishnamoorthi C

Department of Physics

School of Advanced Sciences

Vellore Campus

Manohar a

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 Photochemistry and Photobiology B: Biology

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

Journal of the Taiwan Institute of Chemical Engineers

Effect of co-doping of bismuth, copper and cerium in zinc ferrite on the photocatalytic degradation of bisphenol A

Spinel ferrites at nanoscale showed quite different properties rather than the bulk counterpart. Among all the ferrites, ZnFe2O4 compound is chemically stable and showed very good properties at room temperature. In this investigation, we reported the synthesis and characterization of ZnFe2O4 single-phase crystals of diameter 11 nm by solvothermal reflux method. Temperature-dependent dielectric constant, dielectric loss, and ac-electrical conductivity of the pellet were measured up to 450 °C under different alternating electric field frequencies from 1 kHz to 1 MHz. The obtained data revealed interfacial or space charge polarization mechanism. Furthermore, the sample showed superparamagnetic nature at room temperature. In addition, the magnetic hyperthermia value and specific heat generation rate (SHGR) of 128.76 J s−1 g−1 for ZnFe2O4 compound at 1 mg mL−1 concentration were evaluated. The data were interpreted by spin-relaxation mechanism. ZnFe2O4 nanoparticles showed good photocatalytic activity under UV light irradiation. The data were interpreted by electron–hole pair and radical formation and degradation of Rhodamine B dye. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.

Applied Physics A

Dielectric, magnetic hyperthermia, and photocatalytic properties of ZnFe2O4 nanoparticles synthesized by solvothermal reflux method

Transition metal cations distribution among tetrahedral and octahedral sites in Fe3O4 has profound influence on it properties. The cations distribution among these sites were influenced by crystal field stabilization energy (CFSE) of a substituent ion. It was reported that Cu2+ substitutes both Fe3+ in tetrahedral and Fe2+ in octahedral sites of magnetite though it has high CFSE for octahedral sites. Thus it promotes mixed (normal &amp; inverse) spinel structure and hence the properties deviate from the prediction. Here we show that selective octahedral site substitution of Fe2+ by Cu2+ in single crystal Fe3O4 nanoparticles was possible by solvothermal reflux method at moderate temperatures (≈300 °C). It was attributed to reduced energy barrier for crystallization and high diffusion coefficient of the metal cations at moderate temperature in low viscous organic solvents mixture, at ambient pressure, compared to coprecipitation and solid state reaction protocols. In addition, effective removal of exothermic crystal lattice energy, released during nucleation and growth process, by natural gas bubbles formed in the reflux organic solvent mixture. This promotes effective diffusion of cations during the growth process and easy octahedral occupation by Cu2+ in Fe1−xCuxFe2O4 (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5 &amp; 0.6) single crystal nanospheres. The octahedral substitution was confirmed by reduction of crystal lattice parameter as well as ferromagnetic strength of octahedral sublattice with enhanced Cu2+ concentration. In addition, morphology, lattice vibrational frequency and electron excitation spectra of the nanospheres were studied. The Langevin function fit analysis reveals that superparamagnetic domain diameter were slightly less than the particle diameter obtained from TEM micrograph. © 2017 Elsevier B.V.

Journal of Crystal Growth

Site selective Cu 2+ substitution in single crystal Fe 3 O 4 biocompatible nanospheres by solvothermal reflux method

Inorganic Chemistry

Appendix: Ionic Radii

Optik

Synthesis and properties of spinel ZnFe2O4 nanoparticles by facile co-precipitation route

Journal of Photochemistry and Photobiology A: Chemistry

Synthesis of ZnFe2O4 nanoparticles for photocatalytic removal of toluene from gas phase in the annular reactor

Langmuir

Quantitative Measurement of Ligand Exchange with Small-Molecule Ligands on Iron Oxide Nanoparticles via Radioanalytical Techniques

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

Journal	Data powered by TypesetJournal of Photochemistry and Photobiology B: Biology
Publisher	Data powered by TypesetElsevier BV
ISSN	1011-1344
Open Access	0