JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Xiaojun Zhou,Lingshuai Kong,Zongyu Jing,Shuqing Wang,Yongchao Lai,Meng Xie,Long Ma,Zhenyu Feng,Jinhua Zhan
In this study, superparamagnetic β-CD-MnFe 2 O 4 with a large surface area was synthesized via a facile co-precipitation method, with β-cyclodextrin (β-CD) acting as a coating agent. The as-prepared β-CD-MnFe 2 O 4 exhibited better catalytic performance than bare MnFe 2 O 4 in terms of activating peroxymonosulfate (PMS) to degrade 2,4-dichlorophenol (2,4-DCP) over a broad pH range of 5–11. Electron spin resonance spectroscopy (ESR) and free radical quenching experiments indicate that various active species (SO 4 − / OH/O 2 − / 1 O 2 ) are generated in the β-CD-MnFe 2 O 4 /PMS system and that pollutants trapped in the cyclodextrin cavity are quickly degraded. Various reaction parameters of the β-CD-MnFe 2 O 4 /PMS system and the stability of β-CD-MnFe 2 O 4 were also investigated. The results indicate that β-CD-MnFe 2 O 4 is promising for use in water purification owing to its excellent magnetic separation and recovery properties and good resistance to humic acid (HA).
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
CELLULOSE
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2019
·Vol. 26
·期 8
·5051-5063
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IF 3.917
Wang Xue,Jiang Shengjun,Cui Sheng,Tang Yinhan,Pei Zifan,Duan Haoran
Abstract The pore structure of the regenerated cellulose hydrogel was used as a microreactor for generating magnetic MnFe 2 O 4 nanoparticles via in situ co-precipitation technology. Sodium periodate and sodium chlorite were used as oxidants, and the carboxyl modification of magnetic cellulose aerogels was achieved through a two-step oxidation reaction. The method used was convenient and environmental-friendly, and the raw materials were also green and non-toxic. The addition of magnetic nanoparticles promoted the adsorption and enabled the recycling of materials. The results showed that the adsorption equilibrium time was only 120 min and adsorption capacity could be increased by increasing the adsorption temperature. The maximum adsorption capacity of Cu(II) was 73.70 mg/g at 25 °C when the initial concentration of solution was150 mg/L. The adsorption behaviour towards Cu(II) followed the pseudo-secondary reaction kinetics and the Langmuir isotherm adsorption model. According to the results of XPS, carboxyl and hydroxyl groups were the main active adsorption sites for Cu(II). Moreover, all the composite aerogels exhibited good reusability and could be easily separated from the water after adsorption. Graphical abstract The pore structure of the regenerated cellulose hydrogel was used as a microreactor for generating magnetic MnFe 2 O 4 nanoparticles via in situ co-precipitation technology. Sodium periodate and sodium chlorite were used as oxidants, and the carboxyl modification of magnetic cellulose aerogels was achieved through a two-step oxidation reaction. According to the results of XPS, carboxyl and hydroxyl groups were the main adsorption sites for Cu(II). Moreover, all the composite aerogels exhibited good reusability and could be easily separated 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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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Zhiying Liu,Yue Teng,Yanhua Xu,YuQi Zheng,Yun Zhang,Mingxin Zhu,Yongjun Sun
In this study, spinel-type MnFe 2 O 4 magnetic nanoparticles were successfully synthesized employing the purified sol–gel method and used for the advanced treatment of biologically pretreated semi-coking wastewater (BPSCW) by the O 3 /H 2 O 2 catalytic system. Results showed that the MnFe 2 O 4 magnetic catalysts did not have a regular surface morphology, and their surface contained numerous fine particles that showed a particle accumulation state and formed a good nano-spinel structure. Their surface morphology, ratio, size, and X-ray photoelectron spectroscopy revealed two active metal elements in the catalyst, namely, Fe 3+ and Mn 2+ , which were consistent with the elemental composition and valence of MnFe 2 O 4 . Under optimal reaction conditions, the removal efficiency of O 3 /H 2 O 2 /MnFe 2 O 4 catalytic system for chemical oxygen demand (COD) and volatile phenol (VP) can reach 85.2% and 94.1%, respectively (catalyst dosage = 2.0 g∙L −1 , O 3 dosage = 1.2 mg∙min −1 , H 2 O 2 concentration = 0.15 mol∙L −1 , pH = 7.0, and treatment time = 70 min). The free radical quenching experiment and electron paramagnetic resonance (EPR) experiment verified that hydroxyl radicals (∙OH) played a role in the deep treatment of BPSCW in the O 3 /H 2 O 2 /MnFe 2 O 4 catalytic system. Phosphate experiments proved that lewis acid sites on the surface of the MnFe 2 O 4 magnetic catalysts were the catalytically active sites. The superparamagnetic properties of the MnFe 2 O 4 magnetic catalysts (67.8 emu∙g −1 ) facilitated magnetic separation from the treated wastewater. After 10 cycles, the activity of the MnFe 2 O 4 magnetic catalysts remained high, and the removal efficiencies of COD and VP only decreased by 13.6% and 11.9%, respectively. Considering excellent degradation performance, easy magnetic separation and high stability, this study provided important insights into the practical application of the O 3 /H 2 O 2 catalytic system for the advanced treatment of BPSCW.
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
ACS Applied Nano Materials
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2021
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IF 5.097
Zhipeng Li,Yadan Ding,Xiaokun Wen,Jianbo Cao,Lin Liu,Huiying Zhao,Xiao-Juan Zhu,Xia Hong
Imaging-guided therapy is promising to improve glioma treatment in a personalized way. However, it is still challenging to develop appropriate multifunctional materials to overcome the limitations faced by the current all-in-one theranostic agents, such as the heterogeneous formulations, mutual interference of multifunctionality, and complex toxicity studies. Herein, MnFe2O4 nanoparticle clusters, showing satisfactory magnetic resonance/photoacoustic imaging (PAI)-guided photothermal theranostic performance, were developed as a one-for-all gliomas therapeutic agent. The construction of the cluster structure endowed the theranostic agent with high T2-relaxation rate and photothermal conversion efficiency. Low toxicity and stark contrast effects of magnetic resonance/PAI whose advantages are complementary were demonstrated in vivo and in vitro. Ectopic gliomas significantly shrank or disappeared in the mouse models after 16 days of photothermal therapy. This work proposes a feasible strategy to design and promote high-efficiency theranostic agents for practical application.
研究领域:
生物医学工程
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肿瘤学
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纳米医学
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DOI
高影响因子
MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Xijin Zhao,Xin Kou,Xin Li,Mingjia Li,Ding Xi,Amjad Farid,Hui Huang,Yongpeng Zhao
Herein, multi-layer composite electrodes of MnFe 2 O 4 @carbon nanotubes/carbon cloth (MFO@CNT/CC) are prepared by dip coating and the subsequent hydrothermal method. Flexible conductive carbon cloth (CC) substrate provides a 3D strong base support. The carbon nanotubes (CNT) connected by CC form a conductive network with a large specific area, which is also conducive to electron transfer. The modified MnFe 2 O 4 nanoparticles have abundant active sites, which can enhance the electrochemical activity. CNT and MnFe 2 O 4 nanoparticles form a tandem structure beneficial to increase the active site and promote the response to heavy metal ions. The MFO@CNT/CC electrode has good detection performance for Cd 2+ (0.25–12 ppm) and Pb 2+ (0.25–12 ppm) and a low detection limit of 0.25 ppm. In the presence of interfering ions, it exhibits a highly selective response to the target ion, with minimal current changes and a range of variations (−3.48–5.59 %). The actual detection recovery is in the range of 97.33–101.17 %, suggesting its practical reliability. Furthermore, we propose a detection and analysis method that combines electrochemistry with machine learning; the model attains a perfect classification accuracy of 100 % for both Pb 2+ and Cd 2+ , underscoring the robustness of the classification. Overall, this work provides innovative composites and performance explorations for advancing high-performance simultaneous detection of heavy metal ions.
研究领域:
材料科学
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环境科学
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电化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2018
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IF 4.439
Yixiong Pang,Lingjun Kong,Diyun Chen,Gutha Yuvaraja
Microwave-induced catalytic system has been widely used in oxidation of organic pollutants, but no report focuses on heavy metal reduction. To expand the application field of microwave-induced catalytic system, MoS 2 decorated MnFe 2 O 4 was synthesized by hydrothermal method and employed for the reduction of Cr(VI) in microwave-induced catalytic system. The morphologies, chemical compositions, and optical properties of the synthesized catalysts were investigated using SEM, XRD, FT-IR and XPS. The MoS 2 -MnFe 2 O 4 samples exhibited significantly enhanced microwave-catalytic performance for Cr(VI) reduction compared to pristine MoS 2 and MnFe 2 O 4 , among which, the MoS 2 -MnFe 2 O 4 (10 wt%) sample was most suitable for Cr(VI) reduction in aqueous solution. 85.8% of Cr(VI) removal was obtained in 16 min in the present of MoS 2 -MnFe 2 O 4 . The effect of catalyst dosage, initial pH and microwave output on Cr(VI) reduction were investigated. Mechanism of Cr(VI) removal was investigated by radical quenching experiments. The enhanced microwave-catalytic activity of MoS 2 -MnFe 2 O 4 may be owing to the fact that MoS 2 can act as an electron acceptor to suppress the recombination of microwave-excited electron-holes. These results showed that microwave-induced catalytic reduction system is promising in Cr(VI) decontamination in aqueous solution.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Quan Chen,Zhenya Tang,Hao Li,Min Wu,Qing Zhao,Bo Pan
Heavy metal is a serious environmental issue mostly because of their toxicity and bioaccumulation. The recovering and recycling of the adsorbents became a bottleneck in heavy metal removal through adsorption. A hybrid adsorbent MnFe 2 O 4 @CAC showed great application potential because of its easy regeneration. However, as for other commonly used adsorbents, the removal performance of different types of heavy metals are distinctively different, but the mechanism is still unclear. To address this knowledge gap, the electron-scale behavior and adsorption mechanism of six divalent cations (Cu(II), Cd(II), Pb(II), Co(II), Ni(II), Hg(II)) on MnFe 2 O 4 @CAC were investigated in-depth combining experimental analysis and density functional theory (DFT) calculations. The experimental results showed the order of adsorption: Ni(II) > Cu(II) > Co(II) > Pb(II) > Cd(II) > Hg(II). The reaction from transition state to the final product was the rate-determining step for the Cu(II), Pb(II), Co(II) and Ni(II) adsorption, while the reaction from reactant to intermediate controlled the adsorption rate of Cd(II) and Hg(II). The main adsorption mechanisms were surface complexation and ionic exchange, which were further confirmed by the spectroscopic (Fourier Transform infrared spectroscopy, FT-IR and X-ray photoelectron spectroscopy, XPS) characterizations and DFT calculations. In addition, the electron density of state (DOS) results indicated the 4s orbit of the cations most easily to be occupied by the d electrons of MnFe 2 O 4 . The order of adsorption affinity agreed well with the apparent adsorption, and was decided by the electronic empty orbit and ionic electron cloud size of the cations. The results of the current study provide an in-depth understanding on the adsorption mechanism of heavy metals and offer a theoretical guidance for improving their removal efficiency.
研究领域:
环境科学
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材料科学
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理论化学
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Yanling Liu,Yuying Chen,Xiaping Zhu,Ping Zhao,Wei Ren
The magnetic solid phase extraction material (MnFe 2 O 4 @TiO 2 ) was prepared by coating TiO 2 on MnFe 2 O 4 through an in-situ formation method. The structure and properties of MnFe 2 O 4 @TiO 2 were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), nitrogen adsorption–desorption experiment, and vibrating sample magnetometer (VSM). The conditions for magnetic solid phase extraction (MSPE) of quinolone antibiotics were optimized, and an MSPE-HPLC method was established to determine quinolone antibiotics in water samples. The optimal conditions for MSPE are MnFe 2 O 4 @TiO 2 amount of 15 mg, extraction time of 15 min, 5 mL of methanol solution with 20 % ammonia as eluent, and elution time of 1 min. Under the optimal conditions, 50 mL 0.1 mg/L mixed standard solutions of fleroxacin, ofloxacin, norfloxacin, ciprofloxacin, and enrofloxacin have achieved enrichment multiples of 67.8, 72.1, 59.6, 55.8, and 60.7, respectively. The linear range of five antibiotics determined by MSPE-HPLC is 0.004–1 mg/L with the relative standard deviations (RSDs) of 2.1 %–4.9 % and the limits of detection (LODs) of 0.0006–0.0020 mg/L. The method is applied to the determination of the five antibiotics in rice paddy water and fish pond water; the recoveries range from 78.9 to 105.8 %, and the RSDs (n = 5) are 3.6 %–8.7 %.
研究领域:
环境科学
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分析化学
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产品关联
DOI
高影响因子
WATER ENVIRONMENT RESEARCH
·
2024
·Vol. 96
·期 4
·e11027
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IF 2.5
Yifan Ru,Xianghong Gong,Wangyang Lu,Lu Chen,Lanlan Wei,Qizhou Dai
In this study, we synthesized magnetic MnFe 2 O 4 /ZIF-67 composite catalysts using a straightforward method, yielding catalysts that exhibited outstanding performance in catalyzing the ozonation of vanillin. This exceptional catalytic efficiency arose from the synergistic interplay between MnFe 2 O 4 and ZIF-67. Comprehensive characterization via x-ray photoelectron spectroscopy (XPS), x-ray diffraction (XRD), Fourier transform infrared spectrometer (FT-IR), Brunauer–Emmett–Teller (BET), field emission scanning electron microscopy (FE-SEM), and energy dispersive spectroscopy (EDS) confirmed that the incorporation of MnFe 2 O 4 promoted the creation of oxygen vacancies, resulting in an increased presence of l adsorbed oxygen (O ads ) and the generation of additional ·OH groups on the catalyst surface. Utilizing ZIF-67 as the carrier markedly enhanced the specific surface area of the catalyst, augmenting the exposure of active sites, thus improving the degradation efficiency and reducing the energy consumption. The effects of different experimental parameters (catalyst type, initial vanillin concentration, ozone dosage, initial pH value, and catalyst dosage) were also investigated, and the optimal experimental parameters (300 mg/L1.0-MnFe 2 O 4 /ZIF-67, vanillin concentration = 250 mg/L, O 3 concentration = 12 mg/min, pH = 7) were obtained. The vanillin removal efficiency of MnFe 2 O 4 /ZIF-67 was increased from 74.95% to 99.54% after 30 min of reaction, and the magnetic separation of MnFe 2 O 4 /ZIF-67 was easy to be recycled and stable, and the vanillin removal efficiency of MnFe 2 O 4 /ZIF-67 was only decreased by about 8.92% after 5 cycles. Additionally, we delved into the synergistic effects and catalytic mechanism of the catalysts through kinetic fitting, reactive oxygen quenching experiments, and electron transfer analysis. This multifaceted approach provides a comprehensive understanding of the enhanced ozonation process catalyzed by MnFe 2 O 4 /ZIF-67 composite catalysts, shedding light on their potential applications in advanced oxidation processes. Practitioner Points A stable and recyclable magnetic composite MnFe 2 O 4 /ZIF-67 catalyst was synthesized through a simple method. The synergistic effect and catalytic mechanism of the MnFe 2 O 4 /ZIF-67 catalyst were comprehensively analyzed and discussed. A kinetic model for the catalytic ozone oxidation of vanillin was introduced, providing valuable insights into the reaction dynamics.
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
PubMed
高影响因子
Journal of Water Process Engineering
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2025
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IF 6.7
Siyu Yang,Lei Wang,Jianping Qiu,Mingmin Jia,Zhigang Zhou,Zipeng Zou,Zhongbo Lv,Yuhai Yang,Haonan Zhu,Fangyuan Wang
Addressing the challenge of developing stable and highly efficient catalysts for peroxodisulfate (PDS) activation is crucial for advancing water pollution control technologies. This study introduced a novel magnetic MnFe 2 O 4 /pumice nanocomposite, synthesized through a simple method, aimed at the sustainable activation of PDS for the degradation of Levofloxacin (LEV). Leveraging pumice as a substrate not only enhanced the catalyst's stability and dispersibility but also increased MnFe 2 O 4 's activation sites. Employing a 2:1 mass ratio of MnFe 2 O 4 to pumice, the catalyst achieved a remarkable LEV removal efficiency of 96.69 % and a mineralization efficiency of 55.83 % within 30 min. This performance significantly surpasses that of pumice or MnFe 2 O 4 alone, with the MnFe 2 O 4 /pumice catalyst being 2.81 and 2.18 times more efficient, respectively. Additionally, the MnFe 2 O 4 /pumice + PDS system demonstrated outstanding stability and reusability, maintaining a LEV removal efficiency of 93.5 % after 120 min over ten cycles. Quenching experiments and Electron Paramagnetic Resonance (EPR) studies pinpointed singlet oxygen ( 1 O 2 ) as the primary reactive species, with notable contributions from sulfate and hydroxyl radicals. X-ray photoelectron spectroscopy (XPS) analyses attributed this enhanced activity to the Fe (III)/Fe (II) and Mn (II)/Mn (III) redox couples. The degradation pathways for LEV were further explored using density functional theory and high-resolution liquid chromatography-mass spectrometry (LC-MS), while the ecological toxicity of the degradation intermediates was assessed through quantitative structure–activity relationship (QSAR) analysis. These insights proposed a plausible mechanism for LEV degradation in the MnFe 2 O 4 /pumice activated PDS system, highlighting its potential for wastewater treatment applications.
研究领域:
环境科学
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水处理技术
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产品关联
DOI
高影响因子
Nanomaterials
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2025
·Vol. 15
·期 17
·1382
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IF 4.3
Mengyu Wang,Ming Zhang,Zhihan Liang,Min Su
MnFe2O4magnetic nanoparticles have shown broad application prospects in the field of tumor diagnosis and treatment; however, precise particle size regulation within the 100–200 nm range, as well as the synergistic integration of physical and medical functionalities, remains challenging. As a commonly used method for synthesizing MnFe2O4nanoparticles, the solvothermal method has been proven to enable the regulation of the particle size of products, particularly its ability to utilize the viscosity of solvents as a method for particle size regulation. Therefore, this work investigates the influence of the diethylene glycol (DEG) to ethylene glycol (EG) ratio on particle size regulation in solvothermal synthesis of MnFe2O4nanoparticles, and constructs MnFe2O4@PB nanocomposite materials. The results demonstrate that with the DEG ratio increasing from 0 to 80% in a DEG:EG mixed solvent system, the average particle size of MnFe2O4nanoparticles can be reduced from 266 nm to 105 nm. The MPB4.5 sample (MnFe2O4:PB molar ratio = 5:4.5 in the MnFe2O4@PB nanostructure) exhibits an optimal photothermal heating effect and good photothermal stability, demonstrating potential as a photothermal therapeutic agent. The resultant MnFe2O4@PB system provides a strategy for precise particle size regulation and functional integration for photothermal therapy of tumors with magnetic targeting potential.
研究领域:
纳米材料
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生物医学工程
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癌症治疗
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材料科学
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光热治疗
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产品关联
DOI
PubMed
高影响因子
NANO
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2021
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IF 1.556
Zongli Ren,Zhongwei Zhao,Zhao Yang,Bin Cheng,Xuan Yang
Constructing heterojunction photocatalyst is an effective method to enhance the separation of photogenerated electron and hole, which significantly improves ability of visible light response. In this study, calcination methods have been proposed to prepare highly efficient magnetic ternary photocatalyst g-C 3 N 4 /TiO 2 -MnFe 2 O 4 halloysite. It showed an enhanced photocatalytic degradation for dyes (crystal violet) and nonsteroidal anti-inflammatory drugs (acetaminophen) under vision light irradiation. Compared to pure g-C 3 N 4 , TiO 2 , MnFe 2 O 4 halloysite and binary g-C 3 N 4 -MnFe 2 O 4 halloysite, the optimized ternary g-C 3 N 4 /TiO 2 -MnFe 2 O 4 halloysite displayed enhanced photodegradation efficiency with 91.1% removal of crystal violet (10 ppm) in 90 min under visible light irradiation, the optimized ternary g-C 3 N 4 /TiO 2 -MnFe 2 O 4 halloysite composite showed significantly enhanced photocatalytic activity with more than 79.1% removal of acetaminophen (10 ppm) within 90 min under visible light. The photocatalytic mechanism was identified through the free radical quenching experiment. The heterojunction photocatalyst could be easily recovered by an extra magnetic field and reused several times without any obvious deterioration in catalytic activity. Besides, the ternary heterojunction also exhibited antibacterial ability against Escherichia coli . The superior photocatalytic performance of composite should be mainly attributed to both the improvement of light harvesting as well as the enhanced separation and transfer efficiency. It is expected that this novel ternary visible-light responding composite would be a promising candidate material for organic pollutants degradation and bacteria inactivation.
研究领域:
环境科学
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材料科学
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光催化技术
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微生物学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）