COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Hongtao Wei,Tianxiao Peng,Bingxing Wang,Yongcai Zhang
MnFe 2 O 4 is a potential magnetic visible-light photocatalyst , but its photocatalytic efficiency is badly restricted by the high recombination rate of its photogenerated electrons and holes. This work used conjugated polyvinyl chloride derivative (CPVC) to couple MnFe 2 O 4 to boost its photocatalytic efficiency. CPVC/MnFe 2 O 4 nanocomposites with an n-p heterojunction structure were prepared by an easily implementable three-step approach. When applied to the photocatalytic reduction of aqueous hexavalent chromium (Cr(VI)) with the help of visible-light (λ > 420 nm), the CPVC/MnFe 2 O 4 nanocomposite synthesized under the optimized conditions (CPVC/MnFe 2 O 4 -2) demonstrated not only superior photocatalytic activity than MnFe 2 O 4 nanoparticles and many other recently reported visible-light photocatalysts, but also remarkable durability. In addition, CPVC/MnFe 2 O 4 -2 also had strong magnetism and could be effectively separated from the solution by attraction with a magnet. According to the results of structure and photoelectrochemical characterization, the superior photocatalytic activity of CPVC/MnFe 2 O 4 -2 largely results from its bigger specific surface area and improved photogenerated charge separation and transfer capability. This work suggests that a new cost-effective, efficient and magnetically recoverable visible-light photocatalyst may be developed by coupling MnFe 2 O 4 with CPVC.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Ting Pan,Danni Wang,Yanyu Song,Yongdi Liu,Long D. Nghiem,Jun Duan,Chengdan Che,Xianbo Sun,Zhengqing Cai
This study synthesized MnFe 2 O 4 @S-ZnO with varying S-ZnO loading and investigated their catalytic activity towards Fenton degradation of norfloxacin (NOF). The MnFe 2 O 4 @S-ZnO/H 2 O 2 system achieved 98.3 % of NOF removal within 60 min, with the catalytic activity enhanced by 1.8 times compared to MnFe 2 O 4 . XPS results indicated that Mn and Fe are the active catalytic sites. The doping of S elements accelerated the reduction rates of Fe 3+ and Mn 3+ , thereby improving the utilization efficiency of H 2 O 2 and generating more •OH radicals. The Lewis acidic sites on the surface of MnFe 2 O 4 @S-ZnO coordinated with and reduced the concentration of OH − in the suspension, thereby increasing the acidity of theMnFe 2 O 4 catalyst surface, expanding the pH range of the Fenton reaction to alkaline conditions, allowing the composite material to maintain a NOF removal efficiency of over 90.0 % at even high pH (9.0–10.0). The presence of inorganic anions and humic acid (HA) played negative roles on the NOF degradation, but the MnFe 2 O 4 @S-ZnO/H 2 O 2 system can still achieve a minimum NOF degradation of 62.8 % within 60 min. Moreover, the MnFe 2 O 4 @S-ZnO catalyst exhibited relatively high stability and possessed easy recoverability. Furthermore, this catalyst overcomes the pH limitations of the traditional Fenton reaction, demonstrating significant advantages and promising application prospects.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 45
·28375-28380
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IF 3.361
Ke Liu,Jiaxing Su,Jiangong Liang,Yuan Wu
Mesoporous MnFe2O4 magnetic nanoparticles (mMnFe2O4 MNPs) were prepared with a one-step synthesis method and characterized to possess intrinsic peroxidase-like activity, and had obvious advantages over other peroxidase nanozymes in terms of high catalytic affinity, high stability, mono-dispersion, easy preparation, and quick separation. The mMnFe2O4 MNPs were used as a colorimetric sensor for indirect sensing of urine glucose based on the sensing principle that H2O2 can be produced from glucose oxidation catalyzed by glucose oxidase (GOx), and under the catalysis of the mMnFe2O4 MNPs nanozyme, H2O2 can oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) to produce a blue color in a few minutes. This sensor is simple, cheap, sensitive, and specific to glucose detection with a detection limit of 0.7 μM, suggesting its potential for on-site glucose detection.
研究领域:
生物化学
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医学诊断
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
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IF 8.355
Jing Wang,Min Yue,Yuze Han,Xing Xu,Qinyan Yue,Shiping Xu
The g-C 3 N 4 /MnFe 2 O 4 as recyclable catalyst was synthesized via auto-combustion sol-gel method. Peroxymonosulfate (PMS) activation by the catalyst for triclosan (TCS) degradation was investigated considering the activation performance, reaction parameters and activation mechanism. The catalyst prepared with 1:1 of g-C 3 N 4 and MnFe 2 O 4 molar ratio performed the best catalytic activity in the TCS degradation and with lest metal leaching. The concentration of Cl − showed a dual effect on the TCS degradation, while HCO 3 − and SO 4 2− performed inhibitory effect. Sulfate radicals, hydroxyl radicals, superoxide and non-radical single oxygen contributed to the degradation of TCS. Compared with MnFe 2 O 4 /PMS system, few heavy metals were leached from g-C 3 N 4 /MnFe 2 O 4 (1:1)-PMS after each reuse ( Fig. S6 b), suggesting that g-C 3 N 4 was conducive to the stability of g-C 3 N 4 /MnFe 2 O 4 (1:1) catalyst. Dichlorination, hydroxylation, cyclization and other bond breaking reaction were inferred as the TCS degradation pathways. These results demonstrated that g-C 3 N 4 /MnFe 2 O 4 (1:1) was a highly effective and stable catalyst for PMS activation to treat toxic organic pollutants in water.
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Mingming Zhang,Yan Gong,Ning Ma,Xu Zhao
The combination of photoelectrocatalytic (PEC) and sulfate radical (SO 4 − )-based advanced oxidation technology (SR-AOP) has been regarded as a promising technology for efficient removal of pollutants by in-situ generated reactive radicals in the field of environmental remediation. Herein, a novel PEC/SR-AOP system was constructed by employing a BiVO 4 as photoanode and a MnFe 2 O 4 modified carbon fiber paper (MnFe 2 O 4 /CFP) as cathode. The introduction of MnFe 2 O 4 greatly promotes the peroxymonosulfate (PMS) activation of CFP cathode, and the PEC process accelerates the PMS activation of MnFe 2 O 4 for the high-active SO 4 − production. As a result, the BiVO 4 -MnFe 2 O 4 /CFP system exhibited remarkably enhanced photoelectrocatalytic performances toward Bisphenol A (BPA) degradation. Nearly 100% of BPA can be degraded after 90 min irradiation under the optimal condition of 1.0 V applied bias and 1 mM PMS addition. The apparent rate constant of BPA degradation over the BiVO 4 -MnFe 2 O 4 /CFP PEC/PMS system is achieved to 0.0596 min −1 . Radical scavenger experiments and electron spin resonance confirmed that the generated OH and SO 4 − showed the responsible for BPA degradation during PEC reaction. The results of XPS and LSV tests indicated the favorable redox reaction between MnFe 2 O 4 /CFP and PMS, which results in the generation of high active SO 4 − . This work provided a promising way to synthesize other novel PEC systems with excellent photoelectrocatalytic performance for environmental pollutants removal.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Analysis and Testing
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2019
·Vol. 3
·期 3
·228-237
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IF 0
Niu Xiangheng,Ye Kun,Li Zhibo,Zhao Hongli,Wang Linjie,Pan Jianming,Song Hongwei,Lan Minbo
Developing reliable and facile approaches for alkaline phosphatase (ALP) sensing is important due to its role as a clinical biomarker for many diseases. In this study, we proposed a new and convenient colorimetric assay based on the pyrophosphate (PPi)-mediated oxidase-mimicking activity switching of nanosized MnFe 2 O 4 for the detection of ALP. The synthesized MnFe 2 O 4 exhibited high oxidase-like activity to catalyze the oxidation of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to its blue product TMBox in the presence of dissolved O 2 , leading to a color reaction rapidly and remarkably; PPi could significantly inhibit the activity of the MnFe 2 O 4 nanozyme via the strong interaction between PPi and the Fe(III) species in MnFe 2 O 4 , resulting in the suppression of the TMB color reaction; when ALP was added, it hydrolyzed the PPi substrate to phosphate (Pi) that had no obvious effect on the MnFe 2 O 4 activity, and such that the TMB color reaction catalyzed by the nanozyme could be observed again. With the above principle, linear colorimetric determination of ALP in the scope of 0.6–55 U L −1 was achieved, giving the limit of detection down to 0.27 U L −1 . Besides, the developed assay could provide selective response toward ALP against other co-existing biological species. Furthermore, reliable detection of ALP in human serum samples was verified by our assay, revealing its great promise as an effective and facile tool for ALP monitoring in clinical practice.
研究领域:
分析化学
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生物化学
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纳米技术
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医学诊断
✓ 已验证
DOI
Journal of Water Process Engineering
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2025
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IF 6.7
Lu Wang,Gang Wang,Zhuoting Zhang,Kuang Wang,Qingxia Qiao,Jiayi Jiang,Guan Wang,Tao Liu
Peracetic acid (PAA), an emerging oxidant in advanced oxidation processes, has attracted widespread attention in water treatment. However, there is still a lack of an efficient and environmentally friendly method for activating PAA to remove alkyl imidazolium based ionic liquids ([Bmim] + ) in water. This study introduces MnFe 2 O 4 /PAA system as an effective approach for the degradation of [Bmim] + , which have garnered significant attention due to their wide-ranging industry applications and potential biotoxicity. The degradation kinetics, mechanisms, pathways, and ecotoxicity (acute toxicity test and ecological structure-activity relationship program) of [Bmim] + were comprehensively investigated. The results showed that the highest removal efficiency of 1-Butyl-3-methylimidazolium chloride ([Bmim]Cl) reached 93.9 %. Electron paramagnetic resonance and quenching experiments confirmed that the reactive oxygen species (such as •OH and R-O•) participated in the degradation of [Bmim]Cl. Density functional theory calculations identified the imidazole ring of [Bmim] + as the primary active site for free radical attack. Thirteen oxidation products and two major reaction pathways were identified through ultra performance liquid chromatography/tandem mass spectrometry analysis, showing hydroxylation and carbonylation as the key reactions. Furthermore, ecotoxicity evaluations demonstrated that the degradation intermediates were harmless. This study demonstrates that the MnFe 2 O 4 /PAA system is an efficient and environmentally friendly technology for removing [Bmim]Cl, addressing a critical gap in advanced oxidation processes. Mechanism studies and theoretical calculation of MnFe 2 O 4 -activated PAA provide theoretical references for the PAA-based studies, which may further the commercial application of PAA in removing recalcitrant organic pollutants.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
Journal of Environmental Sciences
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2022
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IF 6.796
Le Thi Thao,To Van Nguyen,Van Quy Nguyen,Ngoc Man Phan,Ki Jae Kim,Nguyen Nhat Huy,Nguyen Trung Dung
Wastewater containing an azo dye Orange G (OG) causes massive environmental pollution , thus it is critical to develop a highly effective, environmental-friendly, and reusable catalyst in peroxymonosulfate (PMS) activation for OG degradation. In this work, we successfully applied a magnetic MnFe 2 O 4 /α-MnO 2 hybrid fabricated by a simple hydrothermal method for OG removal in water. The characteristics of the hybrid were investigated by X-ray diffraction, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, Fourier transform infrared spectroscopy , Brunauer–Emmett–Teller method, vibrating sample magnetometry, electron paramagnetic resonance, thermogravimetric analysis , and X-ray photoelectron spectroscopy. The effects of operational parameters (i.e., catalytic system, catalytic dose, solution pH, and temperature) were investigated. The results exhibited that 96.8% of OG degradation was obtained with MnFe 2 O 4 /α-MnO 2 (1:9)/PMS system in 30 min regardless of solution pH changes. Furthermore, the possible reaction mechanism of the coupling system was proposed, and the degradation intermediates of OG were identified by mass spectroscopy . The radical quenching experiments and EPR tests demonstrated that SO 4 • ̶ , O 2 • ̶ , and 1 O 2 were the primary reactive oxygen species responsible for the OG degradation. The hybrid also displayed unusual stability with less than 30% loss in the OG removal after four sequential cycles. Overall, magnetic MnFe 2 O 4 /α-MnO 2 hybrid could be used as a high potential activator of PMS to remove orange G and maybe other dyes from wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
APPLIED ENERGY
·
2024
·
IF 10.1
Caili Li,Yingjie Li,Yi Fang,Chunxiao Zhang,Yu Ren
CaO-CaCO 3 thermochemical energy storage is a promising technology for solar energy utilization and storage. Alkaline papermaking waste (APW) from paper mills, which is mainly composed of CaCO 3 . Herein, TiO 2 /MnFe 2 O 4 co-modified APW was synthesized. The energy storage capacity of TiO 2 /MnFe 2 O 4 co-modified APW was studied during CaO-CaCO 3 thermochemical energy storage cycles in a duel fixed bed reactor. TiO 2 /MnFe 2 O 4 co-modified APW mainly consists of CaO, MgO, CaTiO 3 , CaMnO 3 , and Ca 2 Fe 2 O 5 . The introductions of TiO 2 and MnFe 2 O 4 significantly improve the cyclic stability and optical absorption property of APW in 30 cycles. The co-modified APW (the mass ratio for CaO:TiO 2 :MnFe 2 O 4 = 100:5:5) possesses high sintering resistance, energy storage, and optical absorption capacities in 30 cycles. The energy storage conversion and capacity of the co-modified APW are 0.72 and 2288.57 kJ/kg after 30 cycles, respectively. The optical absorptance of the co-modified APW reaches 49%, which is 9.25 times as high as that of APW. CaTiO 3 and CaMnO 3 effectively mitigate the sintering of CaO grains. CaMnO 3 and Ca 2 Fe 2 O 5 significantly increase the optical absorptance of APW. The co-modified APW possesses stronger basicity and more oxygen vacancies, which is favourable for the carbonation reaction. Thus, TiO 2 /MnFe 2 O 4 co-modified APW is a good energy storage material.
研究领域:
材料科学
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能源存储
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Weike Zhao,Bo Yang
Novel magnetic MnFe 2 O 4 @honey locust-derived carbon (MnFe 2 O 4 @HL) composites were synthesized via an in-situ hydrothermal precipitation method, and were characterized as an excellent Fenton-like catalyst for tetracycline (TC) degradation. Results showed that the vast majority of TC was mineralized in hydrogen peroxide (H 2 O 2 )/MnFe 2 O 4 @HL system after 120 min of reaction time with 92.3% of removal efficiency and the removal of 71.3% of total organic carbon (TOC). Systematic characterization approaches including scanning electron microscope (SEM), energy-dispersive X-ray spectrometry (EDS), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and vibrating sample magnetometry (VSM) were introduced to reveal the microstructure and properties of magnetic MnFe 2 O 4 @HL composites. Hydroxyl radicals ( • OH) were identified as the major reactive oxygen species (ROS) via the quenching experiments and electron spin resonance (ESR) analysis, while superoxide radicals (·O 2 − ) played a negligible role. The dual cycles of both Fe 3+ /Fe 2+ and Mn 3+ /Mn 2+ were significant enhanced through the bimetallic redox effect and the electron transfer effect of the carbon-based functional group, accelerating the generation of • OH. The removal of TC was still up to 79.3% after five reuses of magnetic composites, demonstrating the MnFe 2 O 4 @HL with excellent stability and reuse performance. The influence of various experimental control conditions involving initial pH, catalyst and H 2 O 2 dosage, temperature, as well as common anions (Cl − , NO 3 − , and HCO 3 − ) on the degradation of TC were finally evaluated. This study provides an efficient in-situ generation method of emerging magnetic materials, and systematically reveals its mechanism of homogeneous Fenton-like catalysis, which shows promising applications for the degradation of environmental contaminants.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 5
·期 10
·7349-7355
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IF 3.708
Jun Wang,Zhiguo Zhou,Li Wang,Jie Wei,Hong Yang,Shiping Yang,Jiangmin Zhao
CoFe2O4@MnFe2O4/polypyrrole nanocomposites, in which CoFe2O4@MnFe2O4 core/shell nanoparticles (NPs) were well-distributed in/on polypyrrole (PPy) nanoparticles, have been prepared by the polymerization of pyrrole by Fe3+ in the presence of polyvinyl alcohol (PVA) and CoFe2O4@MnFe2O4 NPs. In CoFe2O4@MnFe2O4/polypyrrole nanocomposites, the PPy with strong near-infrared absorption can convert 808 nm laser irradiation to heat with a photothermal conversion efficiency of ∼38%, and the CoFe2O4@MnFe2O4 NPs can convert the electromagnetic energy to heat simultaneously in an alternating magnetic field (200 kHz, 60.6 kA m−1) with a specific loss power of 930 W g−1. In vitro experiments showed that the cell viability of 4T1 cells incubated with 200 μg mL−1 of nanocomposites was ∼58% when irradiated by an 808 nm laser (0.2 W cm−2) for 10 min, and ∼68% in an alternating magnetic field (200 kHz, 60.6 kA m−1) for 0.5 h. A combination of 808 nm laser irradiation and alternating magnetic field can ablate nearly all the cells, which suggests the synergistic effect of photothermal and magnetothermal combined therapy.
研究领域:
纳米医学
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癌症治疗
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材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Tanxia Xiang,Dengjie Zhong,Yongxian Zhou,Yunlan Xu,Danli Tang,Wantao Li,Yuanfang Yang,Chunmiao Fan,Jisai Chen
In this study, the MnFe2O4@Co3S4 magnetic nanocomposite was prepared by a two-step hydrothermal method and used to catalyze the ozone oxidation degradation of methylene blue. It was characterized by XRD, EDS, SEM, FT-IR, and XPS. The results showed that the introduction of Co3S4 made MnFe2O4 grow uniformly on Co3S4 nanosheets, which effectively prevented the agglomeration of MnFe2O4. Moreover, MnFe2O4 provided active sites and Mn3+/Mn2+ and Fe3+/Fe2+ cycles for the ozone oxidation process. Not only did Co3S4 provide the active site (Co2+/Co3+) for the ozone oxidation process but also its derived S2–/S22– accelerated the electron transfer rate on the surface of the material, thus improving the efficiency of catalytic ozone oxidation degradation of methylene blue. When the molar ratio of MnFe2O4 to Co3S4 was 6:3 (MnFe2O4@Co3S4-3), the catalytic ozone degradation efficiency of methylene blue was the best, which reached 93.55% in 12 min. The reactive oxygen species in catalytic ozonation degradation of MB were 1O2, O2.–, and ·OH. The MnFe2O4@Co3S4 magnetic nanocomposite is an efficient and stable O3 activator, which maintains high catalytic activity and low metal ion leaching after five cycles, indicating that it has a good application prospect in catalyzing ozone oxidation to degrade organic pollutants.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）