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Magnetic Fe3O4/BiOBr for solar-light-responsive photodegradation of tetracycline antibiotic
(2026-07-01)
Detrat, Natthakitta
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Matsombat, Kanokwan
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Nonthing, Sattra
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Panchakeaw, Atchawadee
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Dulyasucharit, Ruethaithip
Magnetic Fe<inf>3</inf>O<inf>4</inf>/BiOBr photocatalyst was synthesized via an ultrasonic route. It was then applied for detoxification of tetracycline (TC) antibiotic. The prepared BiOBr exhibited E<inf>g</inf> of 2.71 eV while the binary Fe<inf>3</inf>O<inf>4</inf>/BiOBr showed E<inf>g</inf> of 2.04 eV. The Fe<inf>3</inf>O<inf>4</inf>/BiOBr photocatalyst displayed lower photoluminescence signal than BiOBr, suggesting the improvement of the electron-hole separation rate after creation of the magnetic Fe<inf>3</inf>O<inf>4</inf>/BiOBr photocatalyst. The promising photocatalytic efficiency of 100% was obtained. The corresponding enhanced rate constant of 0.0732 min<sup>−1</sup> was achieved. The synthesized Fe<inf>3</inf>O<inf>4</inf>/BiOBr exhibited the promising photocatalytic performance and the excellent structural stability after five cycles of use. The superoxide anion radicals are the main active species involved in the degradation of the pollutant. The present paper demonstrates a novel way to fabricate the sunlight-responsive photocatalyst, with magnetic separable property, for decontamination of TC drug in aqueous phase.
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Electric and magnetic properties of multiferroic CZFMO doped BNLTBKTBaT composite ceramics prepared via the solid-state combustion method
(2025-07-01)
Klinbanmor, Metarsit
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Thatawong, Bhoowadol
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Somsri, Widchaya
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Prasertpalichat, Sasiphon
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Vittayakorn, Naratip
The present research work describes in detail investigations of the multiferroic properties of (1-x) (0.85Bi<inf>0.5</inf>Na<inf>0.475</inf>Li<inf>0.025</inf>TiO<inf>3</inf>-0.11Bi<inf>0.5</inf>K<inf>0.5</inf>TiO<inf>3</inf>-0.04BaTiO<inf>3</inf>)-xCo<inf>0.6</inf>Zn<inf>0.4</inf>Fe<inf>1.7</inf>Mn<inf>0.3</inf>O<inf>4</inf> [(1-x)BNLTBKTBaT-xCZFMO]; x = 0, 0.05, 0.10, 0.15 and 0.20 composite ceramics, synthesized by the solid-state combustion technique. The effect of increasing x content on the phase structure, microstructure, electrical and magnetic properties of (1-x)BNLTBKTBaT-xCZFMO composite ceramics was investigated. X-ray diffraction patterns of the BNLTBKTBaT sample showed a pure perovskite phase (rhombohedral and tetragonal structures). When CZFMO was added, the XRD patterns showed a co-structure between perovskite and cubic spinel ferrite structures. The composite grains were composed of large and small sizes, which were composed of mainly the elements of BNLTBKTBaT and CZFMO, respectively. As x increased, the average grain size of the larger grains increased, and the smaller grains got smaller. The density decreased from 5.54 to 4.61 g/cm<sup>3</sup> as x increased. Increasing the amount of CZFMO in BNLTBKTBaT also resulted in a decrease in the dielectric constant (ε<inf>r</inf>) and the remnant polarization (P<inf>r</inf>), with the leakage current observed at x = 0.20. The saturation magnetization (M<inf>s</inf>) and the magnetoelectric coupling coefficient (α<inf>E</inf>) increased with increased x. It was found that x = 0.15 gave the optimal electric, magnetic, and magnetoelectric properties (ε<inf>r</inf> = 425, P<inf>r</inf> = 1.64 μC/cm, M<inf>s</inf> = 1.1948 emu/g and α<inf>E</inf> = 4.88 mV/cm-Oe), which makes the composite potentially more applicable for information technology and spintronics devices.
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A dual coil induction heating machine for jewelry factories developed by electromagnetic analysis
(2023-06-01)
Pattanapichai, Sorathorn
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Jansaengsuk, Thodsaphon
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Thongsri, Jatuporn
An induction heating machine (IHM) generates magnetic flux density (B) and high temperature for combining precious metals as products in a jewelry factory. Since factories require new generation IHMs for increased productivity and cost savings, a dual coil IHM development approach is presented here to replace conventional, single-coil IHM using electromagnetic analysis (EMA). First, the experiments and the EMA investigated B generated by a conventional one using the factory operating condition. Both agreed, confirming the methodology and reliability of the EMA, which was analyzed to determine B<inf>p</inf>. The B<inf>p</inf> represents a B property for the new dual coil IHM to be expected to generate a comparable signal to the single coil. Then, in development, two novel designs of dual coil IHM (series and parallel) were investigated based on current flow circuits. For these designs, B<inf>p</inf> was investigated using the EMA. As expected, the EMA results showed that both coils generated a different B<inf>p</inf>, which was unfortunately incompatible with the conventional IHM and thus was inappropriate in actual use. However, the series dual coil showed better applicability since it generated B higher than the parallel coil under the same operating conditions. Next, the EMA was applied to determine the B<inf>p</inf> of the series dual coil by varying the applied current (I), frequency (f), number of coil turns (N), and distance between coils (d). Finally, the EMA results revealed two options of the series dual coil with the optimum I, f, N, and d generating B<inf>p</inf> comparable to the conventional IHM, as intended, achieving the factory's need with two times the productivity.

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