Journal of Water Process Engineering
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2023
·
IF 7
Juntong Liu,Ruoyu Sun,Yinsu Wu,Shengtao Xing
The regeneration of spent adsorbent is crucial in terms of environmental and economic aspects. In this study, MnO 2 /MnFe 2 O 4 was synthesized by an impregnation-precipitation method and investigated as a peroxymonosulfate (PMS) catalyst for the regeneration of granular activated carbon (GAC) after adsorption of ofloxacin (OFL). MnO 2 /MnFe 2 O 4 exhibited high catalytic activity for the regeneration of GAC with PMS, and the adsorbed OFL was effectively removed from GAC surface. Singlet oxygen was found to be the dominant reactive species in this process, while O 2 •− and SO 4 •− participated in the degradation of intermediates. At neural pH, the regeneration efficiency of the spent GAC after the adsorption of OFL, tetracycline hydrochloride, ciprofloxacin and methylene blue reached 100 %, 100 %, 87.2 % and 84.2 %, respectively. MnO 2 /MnFe 2 O 4 and GAC exhibited good stability and reusability in this process, and the regeneration efficiency was still above 90 % in the fifth cycle. The results suggest the potential application of PMS activation with magnetic catalyst in the regeneration of GAC after adsorption of organic pollutants .
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高影响因子
Biomedical Materials
·
2023
·Vol. 18
·期 5
·055024
·
IF 4
Lihong Qiao,Xiaoxia Li,Chuanqi Wei,Zhongjun Li,Shisong Han,Du Cheng
Chemodynamic therapy (CDT) is a rising technology for cancer therapy by converting intracellular hydrogen peroxide (H2O2) into hydroxyl radical (•OH) via transition-metal-containing nanoparticles (NPs) catalysis reaction (i.e. Fenton reaction) to kill tumor cells. Highly efficient Fenton reaction and favorable delivery of the catalytic NPs 'nanoenzyme' are the key for successful treatment of cancer. In this work, we developed a novel nanoenzyme MnFe2O4@GFP for in vitro and in vivo antitumor therapy. A new MnFe2O4 nanoparticle containing two transition-metal-element Fe and Mn was synthesized for enhanced Fenton reaction and used to co-deliver protein with high biocompatibility through post-modification with dopamine polymerization, green fluorescent protein adsorption, and PEG coating. The enrichment of H2O2 and glutathione (GSH) in tumor tissue provided a favorable microenvironment for in situ generation of toxic free radicals. Fe3+ and GSH triggered a redox reaction to produce Fe2+, which in turn catalyzed H2O2 into •OH, with the consumption of antioxidant GSH. By combining Fe3+ with another catalyzer, the catalytic efficiency of the nanoenzyme were greatly improved. Consequently, the nanoenzyme showed efficient antitumor ability both in vitro and in vivo. Thus, the multifunctional CDT nanoenzyme platform shows great promising for antitumor therapy through the combination of catalyzers Fe3+ and Mn2+ and codelivery of protein cargo.
研究领域:
生物医学工程
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癌症治疗
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纳米医学
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Tao Peng,Yinsong Si,Junnan Qian,Zhaofa Zhang,Xiaofei Yan,Chengyan Zhu,Xinghua Hong
Reduced graphene oxide (RGO) and magnetic metal oxide composite papers are high needed in microwave absorption , shielding and rapid electrical heating. Herein, a self-assembled multifunctional RGO/MnFe 2 O 4 paper is effectively prepared by a simple method of solution casting and thermal reduction for electromagnetic shielding , microwave absorption, temperature-sensing, electrothermal de-icing. A fast electrical heating is achieved, a saturation temperature of 100.2 °C can be provided within 15 s at a constant current of 0.35 A. In addition, the composite paper under a thermal reduction temperature of 800 °C gives an electromagnetic shielding efficiency (SE) value of 29 dB at X-band and a reflection loss (RL) of 43.2 dB at 14.1 GHz with a thickness of 3 mm and an effective bandwidth (RL < −10 dB) from 10.5 to 16.2 GHz. More, the contact resistance between the graphene-based paper and electrode is decoupled based on the equivalent circuit model, which is greatly contribute to its higher electrothermal and other electrical performance. And the contact resistance is 19.18 Ω, which accounts for 15% of the total resistance of the RGO/MnFe 2 O 4 composite. This RGO/MnFe 2 O 4 paper can offer great potential for fast electrical heater, high performance microwave absorbing and shielding materials.
研究领域:
材料科学
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电磁工程
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纳米技术
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复合材料
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2023
·
IF 5.7
Jun Tao,Yanyan Liu,Yaru Li,Xiaoxiao Xie,Li Feng,Shuao Yang,Yuxue Shan
Background Sulfamethoxazole (SMX), as a widely used antibiotic, has been frequently detected in various environments. The accumulation of SMX in water has posed potential risk to the biology and human health. Advanced oxidation technology (AOPs) is an effective method to remove refractory organic pollutants, which has drawn great attention in recent years. Methods Magnetic MnFe 2 O 4 /MoS 2 nanocomposites were synthesized by a two-step hydrothermal method, and characterized with different physicochemical methods. The catalytic performance and mechanism of MnFe 2 O 4 /MoS 2 were studied by the degradation of SMX under peroxisate (PMS) condition. Significant findings The catalytic performance of MnFe 2 O 4 /MoS 2 nanocomposites was superior to that of individual MnFe 2 O 4 or MoS 2 due to the cyclic effect of Fe(II)/Fe(III) and Mn(II)/Mn(III) occurred in the interfaces of MnFe 2 O 4 /MoS 2 . The degradation efficiency of SMX reached 99.1% within 15 min at room temperature, and the catalytic system can maintain a high degradation efficiency in a wide pH range of 3.0 ∼ 9.0. EPR and radical burst experiments showed the main active species of the MnFe 2 O 4 /MoS 2 –3/PMS reaction system were SO 4 •- and • OH radicals. Furthermore, the catalyst exhibits superparamagnetic properties and good stability to enable its recycle and reuse.
研究领域:
环境科学
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材料科学
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高影响因子
MINERALS ENGINEERING
·
2025
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IF 5
Xiaoyu Jiang,Sikai Zhao,Jie Wang,Haiyi Lv,Weizhen Bai,Wenbao Liu,Qiang Zhao,Yanbai Shen
Tetracycline (TC) persistence in aquatic systems poses significant ecological and human health risks, due to its toxicity and resistance to conventional biodegradation. In this study, sulfur and nitrogen modification strategies were employed to enhance the catalytic performance of spinel ferrite MnFe 2 O 4 for TC degradation via H 2 O 2 and peroxymonosulfate (PMS) activation. The catalysts were characterized using SEM, XRD, VSM, CV, and ICP-OES to elucidate the effects of heteroatom modification on morphology, crystal structure, magnetic separability, and metal leaching behavior. S modification markedly enhanced both H 2 O 2 and PMS activation capabilities. The optimized S/MnFe 2 O 4 -5/H 2 O 2 system removed 82 % TC (50 mg/L) within 20 min, an eightfold increase in the reaction rate compared to the unmodified MnFe 2 O 4 /H 2 O 2 . This system maintained high efficiency across a broad pH range (3–11). In contrast, nitrogen modification selectively improved PMS activation, with the optimal N/MnFe 2 O 4 -3/PMS system degrading 74 % TC in 30 min, twice the degradation rate of MnFe 2 O 4 /PMS, and exhibiting minimal metal leaching with excellent recyclability. Scavenger studies confirmed that ·OH constitutes the dominant reactive oxygen species (ROS) in S/MnFe 2 O 4 -5/H 2 O 2 systems, while both ·OH and ·SO 4 - contribute significantly in N/MnFe 2 O 4 -3/PMS systems. Sulfur species act as electron mediators, facilitating the Fe/Mn redox cycle and enhancing ROS generation, whereas zero valence iron (Fe 0 ) formed during nitrogen modification serves as an efficient electron donor to activate PMS. Degradation pathway analysis and toxicity predictions confirmed a substantial reduction of TC environmental hazards. This work provides fundamental insights into the structure–activity relationships of heteroatom-modified MnFe 2 O 4 catalysts, and establishes practical design principles for robust advanced oxidation process catalysts in antibiotic remediation.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 29
·30498-30507
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IF 2.914
Li Na,Li Weibin,Fu Fenglian
MnFe 2 O 4 was a magnetic material that can be used to adsorb contaminants in the wastewater. Fe(II) could act as a reductant to transfer Cr(VI) into Cr(III). In this paper, mesoporous MnFe 2 O 4 prepared by the coprecipitation method was incorporated with Fe(II) to remove Cr(VI). The samples before and after reaction were characterized by means of X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. A total of 98~100% of Cr(VI) in solution was removed by MnFe 2 O 4 /Fe(II) hybrid system within a wide pH range (pH 3.0–9.0), which is due to the synergetic effects of adsorption from MnFe 2 O 4 and reduction from Fe(II). Cr(VI) was reduced to Cr(III) by ≡Mn(II) on MnFe 2 O 4 and Fe(II). Cr(III) and Fe(III) produced during reaction formed Cr(III)–Fe(III) hydroxides/oxyhydroxides and deposited on MnFe 2 O 4 . The inhibiting action of phosphate on the removal of Cr(VI) was greater than that of sulfate. Cr(VI) removal rate retained 94.5% at the fourth recycle test, which showed excellent re-usability of MnFe 2 O 4 .
研究领域:
环境科学
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材料科学
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PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Yancui Yan,Guannan Guo,Tongtao Li,Dandan Han,Jiahui Zheng,Jianhua Hu,Dong Yang,Angang Dong
In this work, carbon-coated MnFe 2 O 4 nanoparticle (NP) hollow microspheres are fabricated by a facile emulsion-based assembly method followed by in situ ligand carbonization . Specifically, MnFe 2 O 4 NPs stabilized by oleic acid (OA) are the primary building blocks to assemble hollow microspheres , while the subsequent carbonization of OA ligands leads to the formation of uniform carbon coatings without degrading the ordering of NPs. As anode materials for lithium-ion batteries, such MnFe 2 O 4 NP hollow composite microspheres exhibit significantly improved electrochemical performance in comparison with their solid counterparts and most MnFe 2 O 4 -based anodes reported to date, retaining a high reversible capacity of 730 mAh g −1 after 300 cycles at a current density of 2 A g −1 . Furthermore, even when tested at an ultrahigh rate of 10 A g −1 , MnFe 2 O 4 NP hollow microspheres can still deliver a high specific capacity of 433 mAh g −1 . The superior performance of MnFe 2 O 4 NP hollow microspheres is attributable to their hollow superstructure , close-packed configuration of the constituent NPs, and uniform carbon coatings, which facilitate lithium-ion and electron transport while simultaneously alleviating the drastic volumetric change during cycling. Our work establishes that the optimized MnFe 2 O 4 anode material offers great promise for high-performance lithium-ion batteries.
研究领域:
材料科学
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能源科学
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高影响因子
APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Lihua Gao,Zhenggen Liu,Zichao Yang,Laigeng Cao,Cong Feng,Mansheng Chu,Jue Tang
A selective reduction followed by an oxidization roasting process has been reported as an effective route to synthetize spinel manganese ferrite (MnFe 2 O 4 ). In the current work, during the selective reduction process, the Fe y Mn 1−y O (0 ≤ y ≤ 1) samples that acted as intermediates for synthesizing MnFe 2 O 4 were successfully synthesized from Fe 2 O 3 and Mn 2 O 3 systems. The y-value in the synthetic Fe y Mn 1−y O sample was in the range of 0–1 at 800 °C after 30 min. Next, during the oxidization roasting process, the synthetic MnFe 2 O 4 micro-particles with saturation magnetization of 73.7 emu/g were successfully prepared from the Fe y Mn 1−y O samples by an oxidization roasting process for 30 min at 1000 °C in air atmosphere. The formation mechanism and interfacial reaction of manganese ferrite spinel MnFe 2 O 4 samples were systematically investigated by SEM/EDS, XRD, XPS and VSM. Under low temperature (<950 °C), the main reactions were the oxidization of Fe y Mn 1−y O to Mn x Fe 3−x O 4 (1 < x ≤ 3), Mn x Fe 3−x O 4 (0 < x < 1) and Fe 2 O 3 . Under high temperature (>1000 °C), the Mn y Fe 1−y O sample was oxidized to the MnFe 2 O 4 sample, and the normal and inverse spinel structures of MnFe 2 O 4 samples inevitably coexisted and were co-transformed at the same time. This study reported a simple synthetic route that combined selective reduction with an oxidization roasting method to successfully synthesize MnFe 2 O 4 micro-particles. Furthermore, this method could be extended to fabricate other spinel ferrite particles of interest.
研究领域:
材料科学
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无机化学
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功能材料
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磁性材料
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冶金工程
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高影响因子
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
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2026
·Vol. 103
·期 8
·102789
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IF 3.4
Wantong Li,Shuhua Yao,Shifeng Li,Bo Wang,Zhongliang Shi
Resource recovery of waste molecular sieves was achieved through the synthesis of a WMS-MnFe 2 O 4 composite via combined co-precipitation and hydrothermal processes. • Under optimized parameters, approximately 95% degradation of 10 mg/L CIP was accomplished within 30 min by the WMS-MnFe 2 O 4 /UV/PDS system. • WMS-MnFe 2 O 4 /PDS/UV system has a wide range of pH applications. • Analysis of 13 intermediates led to the proposal of three primary degradation pathways: hydroxylation, ring cleavage, and defluorination. • Excellent catalytic stability and reusability were evidenced by a consistent degradation efficiency exceeding 80% over five cycles. To investigate the degradation of ciprofloxacin, a waste molecular sieve-supported manganese ferrite (WMS-MnFe 2 O 4 ) catalyst was fabricated via a combined co-precipitation and hydrothermal method and subsequently evaluated within a peroxydisulfate/UV activation system. The materials were examined by X-ray Diffraction, scanning electron microscope, energy-dispersive, UV-Vis diffuse reflectance spectroscopy, Brunauer-Emmett-Teller analysis via N 2 physisorption, and Vibrating Sample Magnetometer. Under the established optimal conditions (0.25 g/L WMS- MnFe 2 O 4 , 1.00 mM PDS, initial pH 6.3, and 28 W UV light), a degradation efficiency of approximately 95% was observed for 10.00 mg/L CIP, 300 mL solution after a 30-min reaction period. The radical quenching experiments show that ‐ O 2 · ‐ , · OH, ‐ SO 4 · ‐ , and h + generated in the WMS-MnFe 2 O 4 /PDS/UV system, and all played a major role. Liquid chromatography-mass spectrometry analysis identified 13 possible intermediates and suggested three degradation pathways, including hydroxylation, ring cleavage, and defluorination reaction. WMS- MnFe 2 O 4 exhibited excellent stability and recoverability, maintaining a degradation efficiency above 80% over five consecutive cycles. The minimal changes observed in the XRD patterns and SEM images of the spent catalyst further confirm its structural integrity and reusability. This work demonstrates a synergistic approach that enables both the resource recovery of waste molecular sieves and the remediation of organic wastewater. Download: Download high-res image (390KB) Download: Download full-size image
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高影响因子
CELLULOSE
·
2017
·Vol. 25
·期 1
·735-751
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IF 3.417
Cui Sheng,Wang Xue,Zhang Xin,Xia Wei,Tang Xianglong,Lin Benlan,Wu Qi,Zhang Xin,Shen Xiaodong
In this paper, a MnFe 2 O 4 -Cellulose magnetic composite aerogel (MnCA) with high adsorption capacity was fabricated by in situ incorporating MnFe 2 O 4 to regenerated cellulose hydrogel matrix, followed by CO 2 supercritical drying. A green synthetic strategy was performed by using renewable cellulose materials, environmentally benign cellulose solvents and facile synthetic conditions. The results showed that the obtained magnetic cellulose aerogel had a continuous and tiered three dimensional network with interconnected fibrils of about 30 nm in width, which was similar to those of cellulose aerogel prepared from NaOH/urea solution via CO 2 supercritical drying. Meanwhile, they had high specific surface areas of 236–288 m 2 /g and total pore volume of 0.55–0.88 cm 3 /g. In addition, the hybrid aerogel showed superparamagnetism with maximum saturation magnetization reaching up to 18.53 emu/g. The magnetic nanocomposite aerogel could be used for biological and environmental applications. The adsorption test showed that MnCA had rapid adsorption rate and excellent adsorption ability of removing heavy metal ions in aqueous solution which could attain to 63.3 mg/g within 100 min. Moreover, all the composite aerogels exhibited good reusability and could be easily reused from the water after adsorption.
研究领域:
环境科学
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材料科学
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纳米技术
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吸附技术
·
化学工程
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高影响因子
WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 236
·期 1
·1-16
·
IF 3.8
Zheng Lijia,Cao Shoutao,Tang Meng,Ge Ming
A solvothermal route was used to synthesize manganese ferrite/multi-wall carbon nanotubes (MnFe 2 O 4 /MWCNT) composite catalyst, which was firstly employed to activate peroxymonosulfate (PMS) to eliminate rhodamine B (RhB) from water. The catalytic activity of the as-obtained MnFe 2 O 4 /MWCNT for PMS activation and RhB degradation was higher than that of MnFe 2 O 4 and MWCNT. The optimal MnFe 2 O 4 /MWCNT-10 catalyst (0.3 g/L) can remove 98.1% of RhB (20 mg/L) from water by activating PMS (1.0 g/L) after 100 min of reaction, and this catalyst remained stable in the oxidation process. Quenching experiments, X-ray photoelectron spectroscopy (XPS) and electrochemical analysis demonstrated that RhB elimination in the MnFe 2 O 4 /MWCNT-PMS system was accomplished by the non-radical ( 1 O 2 and electron transfer) and free radical (O 2 •− , SO 4 •‒ and •OH) oxidation pathways, and 1 O 2 played a leading role. The influence of operational factors (PMS dosage, initial solution pH, catalyst dosage, reaction temperature, common inorganic anions and water matrix) on RhB removal by MnFe 2 O 4 /MWCNT-10 activated PMS was investigated in detail. The presence of Cl ‒ ions significantly boosted RhB degradation due to the production of more 1 O 2 .
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Yang Wang,Xiaodong Guo,Changtao Chen,Yasai Wang,Qian Li,Zhenguo Wu,Benhe Zhong,Yanxiao Chen
Lithium sulfur battery has been regarded as a promising candidate for the next generation advanced energy storage system with the merits of remarkably high energy density, low cost and natural abundance of elemental sulfur. However, the commercialization application of Li-S battery is severely restricted by the intrinsic poor conductivity of sulfur, dissolution of polysulfide as well as the well-known shuttle effect. Herein, binary transition metal oxide manganese ferrite (MnFe 2 O 4 ) prepared by coprecipitation was successfully used to modify the polypropylene (PP) separator for the first time. The bifunctional modified separator decorated with MnFe 2 O 4 and conductive acetylene black (AB) can efficiently hinder the diffusion of polysulfides due to synergistic effect of effective chemical adsorption and auxiliary physical blocking. Consequently, the cells with modified separator exhibit outstanding rate capacities of 920mAh/g at 1C, 845mAh/g at 2C and superior cycling performance of 625mAh/g after 500 cycles at 1C with a low capacity decaying of 0.074% per cycle. To the best of our knowledge, this work not only firstly testifies that MnFe 2 O 4 could entrap the polysulfide and alleviate the shuttle effect, but also presents a novel strategy by modifying separator with binary metal oxide to enhance the rate capacity and cycle performance of Li-S battery.
研究领域:
材料科学
·
能源存储
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高影响因子
危险品化学品经营许可证（带存储）