JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Yingjie Chen,Zhihao Shi,Shanshan Li,Jianguang Feng,Beili Pang,Liyan Yu,Wenwu Zhang,Lifeng Dong
Heterogeneous nanoparticles with synergistic effects between different composites are potential catalysts with bifunctional catalytic activity for oxygen reduction (ORR) and oxygen evolution reaction (OER). Herein, heteroatoms such as N and S are doped into graphene substrates to improve catalytic activity and structural stability of Ag-MnFe 2 O 4 nanoparticles. Interestingly, these particles keep a primarily heterogeneous structure for their assembly on N, S-codoped graphene (NSG), while Ag domains shrink on S-doped graphene (SG) or N-doped graphene (NG). Subsequently, Ag-MnFe 2 O 4 /NSG shows the best bifunctional catalytic activity due to the improved stability of Ag-MnFe 2 O 4 NPs on NSG and enhanced bonding energy between supports and particles. The Koutecky-Levich plots confirm a major four-electron reaction pathway for the ORRs on Ag-MnFe 2 O 4 /NSG. Meanwhile, Ag-MnFe 2 O 4 /NSG exhibits higher stability and better methanol tolerance than commercial Pt/C. Therefore, Ag-MnFe 2 O 4 /NSG with bi-functional catalytic activity for ORR and OER is a promising non-Pt catalyst candidate.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Yijing Luo,Yubin Su,Yao Lin,Liangbo He,Li Wu,Xiandeng Hou,Chengbin Zheng
Despite the increased interest and great progress obtained on arsenic test, it is still a challenge to accomplish the on-site determination of arsenic in rice due to the expensive instrumentation and harsh digestion process. In this work, MnFe 2 O 4 micromotors were found to retain high catalytic activity to simultaneously produce large amounts of hydroxyl radicals and O 2 bubbles in the presence of H 2 O 2 . Interestingly, the generated bubbles autonomously propel the micromotors and prevent them from depositing, thus keeping their high catalytic activity. As a result, a MnFe 2 O 4 micromotors enhanced digestion method was developed for the field digestion of rice samples within 100 min only using H 2 O 2 , which was further utilized to realize the on-site detection of arsenic in rice by coupling with the Gutzeit method followed headspace solid phase extraction . A quantification limit of 40 μg kg −1 was obtained for the determination of arsenic in rice. Owing to their capabilities of the efficient and rapid adsorption of arsenic and continuous movement, a MnFe 2 O 4 micromotors enhanced solid phase extraction was also established for the sensitive determination of arsenic in water with a 1 μg L −1 of quantification limit. The accuracy of the developed method was validated via analysis of a Certified Reference Material of rice (GBW10043) and a series of rice and water samples with satisfactory results, showing promising potential in the sensitive on-site detection of arsenic in rice and water samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 31
·14654-14667
·
IF 6.97
Binbin Ding,Shuai Shao,Haihua Xiao,Chunqiang Sun,Xuechao Cai,Fan Jiang,Xueyan Zhao,Ping'an Ma,Jun Lin
The limited light penetration depth and tumor hypoxia are two natural shortcomings of photodynamic therapy (PDT). Overcoming these two issues within a single system is still a great challenge. Herein, photosensitizer (PS)-loaded and PEG-modified MnFe2O4-decorated large-pore mesoporous silica-coated β-NaYF4:20%Yb,2%Er@β-NaYF4 upconversion nanoparticles (UCMnFe-PS-PEG) as excellent PDT agents are successfully prepared for NIR light-mediated and O2 self-sufficient PDT. The large mesoporous structure observably increases PS loading efficiency (11.33 wt%) and the green luminescence from upconversion nanoparticles activated by NIR is able to activate PSs to generate ROS effectively. In addition, sub-10 nm MnFe2O4 nanoparticles work as a Fenton catalyst to generate O2in situ. In vivo experiments further prove that UCMnFe-PS-PEG not only provides magnetic guidance to the tumor, but also overcomes tumor hypoxia and dramatically enhances PDT efficiency. Furthermore, in vivo MR and UCL imaging are performed for accurate cancer therapy. We believe that the successful construction of the multifunctional UCMnFe-PS-PEG provides more revelations for developing advanced nano-drug systems for cancer therapy.
研究领域:
生物医学工程
·
纳米医学
·
肿瘤治疗
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Wei Ding,Huaili Zheng,Yongjun Sun,Zhiwei Zhao,Xinyu Zheng,Yuyang Wu,Weilong Xiao
As(III) oxidation to As(V) is deemed necessary for better arsenic removal, and separation is still the optimal approach for water remediation from As(III). Herein, sulfite (SIV) was adopted to activate MnFe 2 O 4 for simultaneous oxidation and adsorption of As(III) in neutral water. The As(III) removal was more efficient than a peroxidation of As(III) followed by adsorption. The adsorption capacity of MnFe 2 O 4 /S(IV) for As(III) (26.257 mg g −1 ) was much higher than those of MnFe 2 O 4 alone for As(III) (9.491 mg g −1 ) and As(V) (9.142 mg g −1 ). The mechanistic study corroborated that intermediate Mn(III) was the dominant oxidant responsible for rapid oxidation of As(III), and the dual roles of S(IV) as a complexing ligand and a precursor of oxysulfur radicals accelerated the redox cycle of Mn(II)/Mn(III). Moreover, S(IV) enhanced arsenic adsorption by driving more production of monodentate complexes. As(III) can be effectively removed over a wide range of temperatures (283.15–313.15 K) and pH (3–10) with the optimal pH of 7. The effect of coexisting ions and reusability of MnFe 2 O 4 were also investigated. Especially, the superior performance of MnFe 2 O 4 /S(IV) for As(III) removal in various water matrixes may help develop new removal technologies based on active Mn(III) for the water decontamination from As(III).
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Huan He,Jingxian Mei,Feng Liu,Yu Yan,Muhammad Nauman Tahir,Gui Yang,Ziwei Guo,Guoli Dong,Juhong Zhan,Bin Huang,Xuejun Pan
Diversified emerging contaminants pose significant threats to human health and the environment, greatly impeding the reuse of reclaimed water. Currently, photoelectrocatalytic (PEC) technology has been proven as an effective and feasible method for removing contaminants, but its application is limited by complex preparation process of PEC anode. Herein, a novel magnetic attraction synthesis approach was proposed to develop a PEC anode named MnFe 2 O 4 -TiO 2 nanotube arrays. The Magnet-MnFe 2 O 4 -TiO 2 (MMT) anode presented several advantages, including a narrower band gap, decreased charge recombination rates, and minimal electron transfer resistance. The PEC system equipped with MMT anode achieved high degradation efficiencies, removing 76.4 % of 17α-ethinylestradiol (EE2) in 60 min and completely degrading tetracycline (TC) in 10 min. Various pathways for the generation of reactive radicals were clarified in the PEC system, including photocatalysis, electrocatalysis and Fenton reaction. The contributions of each reactive radical were examined, wherein ·OH and ·O 2 − were primary contributors to the degradation of EE2 and TC, respectively. The identification of degradation products also verified the vital roles of reactive radicals in the degradation of two pollutants. This study explored the feasibility of a magnetic attraction synthesis strategy in enhancing the PEC performance to remove trace pollutants in reclaimed water.
研究领域:
环境科学
·
污染控制
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materiomics
·
2025
·
IF 9.6
Jia Wang,Yuanbo Zhang,Zijian Su,Tao Jiang
Silicon (Si) has been proven to significantly enhance CO 2 reduction efficiency of numerous catalysts. However, the lack of research on Si's effect on manganese ferrite catalytic performance presents a challenge in using high-silica manganese ore to prepare cost-effective, efficient manganese-based ferrite decarbonization catalysts. This work prepared Nano-MnFe 2 O 4 materials containing 0.0%–9.3%Si (2.3% increments, in mass fraction) by solid-phase synthesis (1300 °C, air) and nano-grinding. The effect, mechanism, and enhancement strategy of Si on the low-temperature catalytic reduction of CO 2 to carbon (C) performance of Nano-MnFe 2 O 4 were systematically investigated. Results showed that introducing Si transformed Nano-MnFe 2 O 4 into Nano-Mn X Fe 3– X O 4 (0.75 < X < 1.00) with degraded catalysis and Nano-Fe Y Mn Z SiO 4 with almost no activity, lowering CO 2 reduction to C from 5.55 mmol/g to 2.81 mmol/g. Increasing Si concentration simultaneously decreased the content and X -value of Nano-Mn X Fe 3- X O 4 , causing fewer oxygen vacancies and declined CO 2 reduction. A phase reconstruction strategy to eliminate Si impact and enhance catalysis was proposed, i.e. , adding MgO, increasing Mn/Fe ratio, and nano-grinding followed by magnetic separation. Nano-Mg 0.19 Mn 1.70 Fe 1.11 O 4 reconstructed from Nano-MnFe 2 O 4 with 2.3% Si exhibited 8.82 mmol/g CO 2 reduction and 100% carbon conversion at 350 °C. Mg 2+ doping strengthened the conversion of Mn 2+ to highly catalytically active Mn 3+ and Mn 4+ ions, increasing oxygen vacancies and electron transport for C=O rupture.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nano Today
·
2025
·
IF 10.9
Majid Sharifi,Majid Salehi,Somayeh Ebrahimi-Barough,Mohammad Kamalabadi-Farahani
Neuroma formation following the repair of nerve injuries exceeding 0.9 cm in length severely impedes functional recovery. To overcome this challenge, we engineered magnetically responsive core-shell nanoparticles (MnFe 2 O 4 @ZIF-8@Retinoic acid, MFZR; 90–360 nm) to guide regeneration within a decellularized umbilical cord artery (DUCA) conduit. We investigated the synergistic effect of MFZR under an external magnetic field (MF) on Schwann cell behavior in vitro and on sciatic nerve repair in a rat model. Under MF exposure, MFZR significantly enhanced Schwann cell migration, alignment, and elongation on DUCA conduits. In-vivo , the MFZR+MF combination potently promoted functional recovery, as measured by the sciatic functional index, muscle compound action potential, and nerve conduction velocity, without inducing DUCA-related inflammation. Histological analysis demonstrated robust regeneration, characterized by increased axon diameter, an improved G-ratio, and elevated expression of S100 and NF-200. This regeneration was facilitated by a healing-promoting M2 macrophage polarization at the injury site. Critically, the strategy exhibited no systemic toxicity. These findings establish that magnetically guided MFZR effectively prevents neuroma in the DUCA conduits, orchestrates a pro-regenerative microenvironment, and achieves significant functional recovery, offering a promising translatable strategy for nerve repair.
研究领域:
生物医学工程
·
神经生物学
·
组织工程
·
纳米医学
·
再生医学
·
免疫调节
·
转化医学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Xinde Jiang,Zhuoru Tan,Guixian Jiang,Chang Liu,Guiqing Gao,Zhanmeng Liu
A magnetic MnFe2O4-modified graphite-like porous biochar composite (MnFe2O4/KFS800) was synthesized by the hydrothermal method, and its catalytic activity was evaluated in the activation of peroxydisulfate toward degradation of Rhodamine B. After characterization by SEM, XRD, and the BET method, the specific surface area and total pore volume of the MnFe2O4/KFS800 catalyst reached 121 m2/g and 0.263 m3/g, and exhibited plate-like morphology with good crystallinity. The degradation rate of Rhodamine B by the obtained composite was more than 91.1% when the initial concentration of RhB was 10 mg/L, the dosage of MnFe2O4/KFS800 was 0.2 g/L, and the initial pH was 6.7. Then the anti-interference ability of the obtained composite was studied, and it was found that there was a little effect on the degradation of Rhodamine B with the presence of humic acid. Finally, quenching test, EPR research, and XPS analysis were conducted to reveal the catalytic mechanism, and possible mechanism was a synergistic behavior of free radicals (SO4•–, •OH, O2•–) and nonfree radicals (1O2), and trace amounts of uncarbonized bagasse was also involved in the formation of free radicals.
研究领域:
环境科学
·
催化材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2026
·
IF 6.6
Xian Li,Yuqing Yang,Qitao Guo,Daoyuan Xue,Shuai Tian,Guiqing Gao,Xinde Jiang,Zhanmeng Liu
The MnFe₂O₄@CeO₂/PAA system could achieve 97.3% TC within 30 min. • The ROS of CH₃C( O )OO• was dominated in TC degradation. • The doping of CeO 2 could improve the ion leaching rate and enhance catalytic performance. • Relatively better anti-interference capability of this system To addresses the problem of agglomeration and enhance the catalytic performance of MnFe 2 O 4 , the catalyst with MnFe 2 O 4 nanoparticles comparatively evenly dispersed and embedded on the CeO 2 nanosheets (MnFe 2 O 4 @CeO 2 ) was synthesized via a one-step low-temperature co-precipitation route. Then the prepared MnFe 2 O 4 @CeO 2 was employed to constitute PAA activation (MnFe 2 O 4 @CeO 2 /PAA) system for the TC degradation. The morphology, structure, and properties of MnFe 2 O 4 @CeO 2 have been explored and TC degradation experiments have been conducted. Under the optimized conditions, TC could achieve 97.3% degradation efficiency (reaction rate constant k = 0.1238 min −1 ) and 66.4% TOC removal within 30 min. Reactive oxygen species (ROS), including hydroxyl radical (•OH), singlet oxygen ( 1 O 2 ), and acetylperoxyl radical (CH 3 C( O )OO•), were identified and involved in the TC degradation, while CH 3 C( O )OO• was verified to play the most important role. The introduction of CeO 2 could accelerate electron transfer and decrease the leaching concentration of Fe and Mn. In addition, few intermediates toxicity, relative strong anti-interference ability among various anions and multitudinous water matrixes, low leaching ions, great reusability, excellent degradation performance towards other organic pollutants exhibited the prospect potential application of this MnFe 2 O 4 @CeO 2 /PAA system. Overall, this study provides a referential significance of PAA activation system involved in the remediation of organic pollutants. Download: Download high-res image (225KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
Sustainable Materials and Technologies
·
2025
·
IF 9.2
Xianjin Qi,Guizhi Yan,Boyu Du,Mengmeng Wang,Yongkui Li
Arsenic (As) contamination is a global problem that requires innovative remediation, this study successfully synthesized a novel MnFe 2 O 4 -Zn/Co ZIFs@MIL-53(Fe) (MFZM) using a solvent method to remove As(V) from contaminated water. The MFZM exhibited a rhomboidal dodecahedron structure with a high specific surface area of 158.93 m 2 /g, which contributed to its exceptional adsorption performance under both acidic and neutral pH conditions. Notably, the adsorption capacity for As(V) reached approximately 599.90 mg/g at an equilibrium concentration of 500 mg/L, surpassing the performance of several previously reported adsorbents. The kinetic modelling results indicated that the adsorption process followed a pseudo-second-order mechanism, suggesting chemisorption as the dominant process. However, the isotherm studies demonstrate favorable single-layer adsorption, with the Langmuir model providing the best fit for the experimental data. The X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS) analysis revealed that the Fe/Mn/Co on the MFZM surface can hydrolyze and generate Fe/Mn/Co-OH groups under pH conditions ranging from 3 to 7, facilitating the formation of stable coordination complexes with As(V). Furthermore, the MFZM provided abundant positively charged adsorption sites that effectively attracted HAsO 4 2− via electrostatic interactions, leading to efficient As(V) removal. These findings underscore the potential of the MFZM as a promising adsorbent for the effective remediation of As-contaminated wastewater, supporting sustainable environmental management.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2018
·Vol. 124
·期 10
·675
·
IF 1.604
Thu Tran V.,Thao Vu D.
Combination of co-precipitation and hydrothermal methods is a promising route to synthesize various materials. Herein, we synthesized reduced graphene oxide/manganese ferrite (rGO/MnFe 2 O 4 ) nanocomposites through combining a co-precipitation reaction of Mn 2+ and Fe 3+ ions in GO solution with subsequent hydrothermal treatment at different temperatures (80, 130, and 180 °C). The resulting rGO/MnFe 2 O 4 nanocomposites were characterized using X-ray diffractometry, Fourier-transform infrared spectroscopy, scanning and transmission electron microscopy, and magnetic measurements at room temperature. The influence of hydrothermal temperature on structural, morphological, magnetic and As(III) adsorption properties of rGO/MnFe 2 O 4 nanocomposites was studied. Increasing hydrothermal temperature leads to better crystallinity, magnetic properties, and As(III) adsorption capacity. At the hydrothermal temperature of 180 °C, the resulting rGO/MnFe 2 O 4 nanocomposites exhibited a crystalline size of 37.2 nm, saturated magnetization of 22.7 emu/g, and As(III) removal efficiency of 83% at neutral pH (pH ≈ 7).
研究领域:
材料科学
·
纳米科技
·
环境功能材料
·
磁性材料
·
无机非金属材料
✓ 已验证
DOI
高影响因子
ACS Nano
·
2020
·
IF 14.588
Jiong Pan,Ping Hu,Yuedong Guo,Junnian Hao,Dalong Ni,Yingying Xu,Qunqun Bao,Heliang Yao,Chenyang Wei,Qingsheng Wu,Jianlin Shi
Cancer immunotherapy shows promising potential in future cancer treatment but unfortunately is clinically unsatisfactory due to the low therapeutic efficacy and the possible severe immunotoxicity. Here we show a combined magnetic hyperthermia therapy (MHT) and checkpoint blockade immunotherapy for both primary tumor ablation and mimetic metastatic tumor inhibition. Monodispersed, high-performance superparamagnetic CoFe2O4@MnFe2O4 nanoparticles were synthesized and used for effective MHT-induced thermal ablation of primary tumors. Simultaneously, numerous tumor-associated antigens were produced to promote the maturation and activation of dendritic cells (DCs) and cytotoxic T cells for effective immunotherapy of distant mimetic metastatic tumors in a tumor-bearing mice model. The combined MHT and checkpoint blockade immunotherapy demonstrate the great potentials in the fight against both primary and metastatic tumors.
研究领域:
肿瘤学
·
纳米技术
·
免疫学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）