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Magnetochemistry
Volume 10
Issue 9
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Magnetochemistry, Volume 10, Issue 9 (September 2024) – 5 articles

Cover Story (view full-size image): We developed an IO-TiO2 nanocomposite by combining positively charged iron oxide nanoparticles (IO-bPEI) with negatively charged TiO2@CA by means of heteroagglomeration. This novel nanocomposite was used for the photocatalytic degradation of ciprofloxacin under UV-B irradiation. The IO-TiO2 nanocomposite showed satisfactory performance with a remarkable magnetic response and good reusability, maintaining its stability and photocatalytic behavior over three cycles. Our study shows that iron oxide not only acts as a carrier for TiO2@CA NPs but also delays electron–hole recombination, which enhances the photocatalytic efficiency. The IO-TiO2 nanocomposites highlight their significant potential as magnetic photocatalytic materials to reduce antibiotic residues in wastewater. View this paper
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12 pages, 1820 KiB  
Article
Energy Conversion Associated with Intermittent Currents in the Magnetosheath Downstream of the Quasi-Parallel Shock
by Xinmin Li, Rongsheng Wang, San Lu, Ao Guo and Zhijian Zhang
Magnetochemistry 2024, 10(9), 67; https://doi.org/10.3390/magnetochemistry10090067 - 21 Sep 2024
Viewed by 426
Abstract
Using the data from the Magnetospheric Multiscale (MMS) mission, we studied the energy conversion between electromagnetic fields and particles (ions and electrons) in a spacecraft rest frame inside a turbulent magnetosheath downstream of the quasi-parallel shock. The results show that the energy conversion [...] Read more.
Using the data from the Magnetospheric Multiscale (MMS) mission, we studied the energy conversion between electromagnetic fields and particles (ions and electrons) in a spacecraft rest frame inside a turbulent magnetosheath downstream of the quasi-parallel shock. The results show that the energy conversion was highly intermittent in the turbulent magnetosheath, and the perpendicular electric fields dominated the energy conversion process. The energy conversion among the electromagnetic fields, ions, and electrons was related to the current intensity. In the region with weak current, the ions gained energy from electromagnetic fields, while the electron energy was released and transferred into electromagnetic fields. In contrast, in the intense current region, the energy of ions was transferred into the electromagnetic fields, but the electrons gained energy from electromagnetic fields. The results quantitatively established the relationship between energy conversion rate and current density and revealed that the energy conversion among the electromagnetic fields, ions, and electrons was related to the local current intensity inside the shocked turbulence. Full article
(This article belongs to the Special Issue New Insight into the Magnetosheath)
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29 pages, 14782 KiB  
Article
First Utilization of Magnetically-Assisted Photocatalytic Iron Oxide-TiO2 Nanocomposites for the Degradation of the Problematic Antibiotic Ciprofloxacin in an Aqueous Environment
by Josip Radić, Gregor Žerjav, Lucija Jurko, Perica Bošković, Lidija Fras Zemljič, Alenka Vesel, Andraž Mavrič, Martina Gudelj and Olivija Plohl
Magnetochemistry 2024, 10(9), 66; https://doi.org/10.3390/magnetochemistry10090066 - 6 Sep 2024
Viewed by 602
Abstract
The emergence of antimicrobial resistance due to antibiotics in the environment presents significant public health, economic, and societal risks. This study addresses the need for effective strategies to reduce antibiotic residues, focusing on ciprofloxacin degradation. Magnetic iron oxide nanoparticles (IO NPs), approximately 13 [...] Read more.
The emergence of antimicrobial resistance due to antibiotics in the environment presents significant public health, economic, and societal risks. This study addresses the need for effective strategies to reduce antibiotic residues, focusing on ciprofloxacin degradation. Magnetic iron oxide nanoparticles (IO NPs), approximately 13 nm in size, were synthesized and functionalized with branched polyethyleneimine (bPEI) to obtain a positive charge. These IO-bPEI NPs were combined with negatively charged titanium dioxide NPs (TiO2@CA) to form magnetically photocatalytic IO-TiO2 nanocomposites. Characterization techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), infrared spectroscopy (IR), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), electrokinetic measurements, and a vibrating sample magnetometer (VSM), confirmed the successful formation and properties of the nanocomposites. The nanocomposites exhibited a high specific surface area, reduced mobility of photogenerated charge carriers, and enhanced photocatalytic properties. Testing the photocatalytic potential of IO-TiO2 with ciprofloxacin in water under UV-B light achieved up to 70% degradation in 150 min, with a degradation rate of 0.0063 min−1. The nanocomposite was magnetically removed after photocatalysis and successfully regenerated for reuse. These findings highlight the potential of IO-TiO2 nanocomposites for reducing ciprofloxacin levels in wastewater, helping curb antibiotic resistance. Full article
(This article belongs to the Special Issue Magnetic Materials, Thin Films and Nanostructures (Volume II))
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3 pages, 604 KiB  
Correction
Correction: Grewal et al. Structural and Photocatalytic Studies on Oxygen Hyperstoichiometric Titanium-Substituted Strontium Ferrite Nanoparticles. Magnetochemistry 2022, 8, 120
by Jaspreet Kaur Grewal, Manpreet Kaur, Rajeev K. Sharma, Aderbal C. Oliveira, Vijayendra Kumar Garg and Virender K. Sharma
Magnetochemistry 2024, 10(9), 65; https://doi.org/10.3390/magnetochemistry10090065 - 5 Sep 2024
Viewed by 291
Abstract
The authors wish to make a change to the published paper [...] Full article
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14 pages, 4615 KiB  
Article
Controllable Synthesis of Magnetic Composite Derived from MIL-88D and Study on Adsorption Properties of Cu2+
by Zhongyuan Zheng, Jinshan Yu, Ling Jiang, Jiacheng Zhang and Min Lu
Magnetochemistry 2024, 10(9), 64; https://doi.org/10.3390/magnetochemistry10090064 - 31 Aug 2024
Viewed by 710
Abstract
In this paper, MIL-88D (Fe) with spindle shape was prepared by the hydrothermal synthesis method, a metal oxide with a new structure was obtained by calcination at different temperatures as a precursor, and a magnetic iron oxide composite was prepared successfully. At the [...] Read more.
In this paper, MIL-88D (Fe) with spindle shape was prepared by the hydrothermal synthesis method, a metal oxide with a new structure was obtained by calcination at different temperatures as a precursor, and a magnetic iron oxide composite was prepared successfully. At the same time, it was used as an adsorption material for the adsorption of heavy metal ions Cu2+. The influence of the initial pH value and adsorption time on the adsorption effect was investigated, the adsorption kinetics and adsorption isotherm were further fitted, and the adsorption mechanism was preliminarily analyzed. The results show that the magnetic iron oxide composites have a good adsorption capacity for Cu2+. The pH value is an important parameter that affects the adsorption effect. The adsorption of Cu2+ by magnetic iron oxide composites reached adsorption equilibrium in 30 min. The adsorption of Cu2+ by magnetic iron oxide composites conforms to the second-order reaction kinetics and Langmuir adsorption isotherm equation, which indicates that the adsorption process mainly occurs through chemisorption and typical single-molecular-layer adsorption. Full article
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9 pages, 2613 KiB  
Communication
Microwave-Assisted Combustion Synthesized Sm2Co17 Magnetic Particles for Permanent Magnetic Application
by Yatao Wang, Xiangyu Ma, Yani Lu, Hui Wen, Guozhe Guo, Yingying Li, Pengming Zhang, Yan Wang and Zhi Yang
Magnetochemistry 2024, 10(9), 63; https://doi.org/10.3390/magnetochemistry10090063 - 29 Aug 2024
Viewed by 636
Abstract
We reported the new synthesis of Sm2Co17 particles by a microwave-assisted combustion (MACS) method. This process enables the controlled decomposition of Sm(NO3)3 and Co(NO3)2 into SmCo-O particles, followed by calcium reduction-diffusion. This SmCo-O particle [...] Read more.
We reported the new synthesis of Sm2Co17 particles by a microwave-assisted combustion (MACS) method. This process enables the controlled decomposition of Sm(NO3)3 and Co(NO3)2 into SmCo-O particles, followed by calcium reduction-diffusion. This SmCo-O particle provides an approach for achieving high magnetic properties in Sm2Co17 magnetic materials. The rhombohedral Sm2Co17 particles can be incorporated into epoxy resin and oriented, displaying a square-like hysteresis loop. The particles display magnetic properties at room temperature, with a saturation magnetization of 112.3 emu/g, coercivity of 5.6 kOe, and a maximum energy product of 9.4 MGOe. This method improves the synthesis efficiency of rare earth cobalt-based nano-materials, expands the synthesis scope, and provides ideas for the synthesis and applications of other rare earth nano-materials. Full article
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