CHEMOSPHERE
·
2017
·
IF 4.208
Qingsong Hu,Yuling Liu,Xueyuan Gu,Yaping Zhao
Arsenic pollution poses severe threat to human health, therefore dealing with the problem of arsenic contamination in water bodies is extremely important. The adsorption behaviors of different arsenic species, such as arsenate (As(V)), p-arsanilic acid (p-ASA), roxarsone (ROX), dimethylarsenate (DMA) from water using mesoporous bimetal oxide magnetic manganese ferrite nanoparticles (MnFe 2 O 4 ) have been detailedly investigated. The adsorbent was synthesized via a facile co-precipitation approach and recovered conveniently owing to its strong magnetic properties. The obtained MnFe 2 O 4 with large surface area and abundant hydroxyly functional groups exhibited excellent adsorption performance for As(V) and p-ASA, in contrast to ROX and DMA with the maximum adsorption capacities of As(V), p-ASA, ROX and DMA of 68.25 mg g −1 , 59.45 mg g −1 , 51.49 mg g −1 , and 35.77 mg g −1 , respectively. The Langmuir model and the pseudo-second-order kinetic model correlated satisfactorily with the adsorption thermodynamics and kinetics, and thermodynamic parameters depicted the spontaneous endothermic nature for the adsorption of different arsenic species. The adsorption mechanism of different arsenic species onto MnFe 2 O 4 nanoparticles at various pH values could be explained by surface complexation and molecular structural variations. Attenuated Total internal Reflectance Fourier Transform Infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS) further proved that arsenic species were bonded to the surface of MnFe 2 O 4 through the formation of an inner-sphere complex between the arsenic acid moiety and surface metal centers. The results would help to know the interaction of arsenic species with iron-manganese minerals and the mobility of arsenic species in natural environments.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
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IF 3.299
Jing Deng,ShanFang Feng,Xiaoyan Ma,Chaoqun Tan,Hongyu Wang,Shiqing Zhou,Tuqiao Zhang,Jun Li
Highly ordered mesoporous MnFe 2 O 4 was fabricated via the nanocasting strategy and innovatively used to activate peroxymonosulfate for the degradation of Orange II in water. The effects of several key parameters including catalyst dosage, peroxymonosulfate concentration, temperature and initial pH on the degradation performance were investigated. Results showed that the catalytic activity of ordered mesoporous MnFe 2 O 4 was far superior than that of spinel MnFe 2 O 4 , which can be attributed to its unique structural characteristics. Data fitting showed that the Orange II degradation could be described by the pseudo-first-order kinetics under all conditions tested in this study. Ordered mesoporous MnFe 2 O 4 presented stable and excellent catalytic activity in wide pH range of 5–9. Both the increase of catalyst dosage and temperature favored the enhancement in catalytic efficiency. However, the Orange II degradation tended to have a decline trend after an initial ascent as the peroxymonosulfate concentration increased. Moreover, ordered mesoporous MnFe 2 O 4 was reusable over five consecutive cycles and negligible leaching of metal ions was observed during catalytic reaction. The balance among Mn 2+ /Mn 3+ , Fe 2+ /Fe 3+ and peroxymonosulfate decomposed in solution was considered as the proposed activation mechanism, and the generation of sulfate radicals played the dominant role in the Orange II degradation.
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
OPTICAL MATERIALS
·
2022
·
IF 3.754
Di Xie,Shuo Zhang,Tianyu Wu,Mei He,Yiyan Cai,Panpan Zhao,Fangchao Cheng
The MnFe 2 O 4 /g-C 3 N 4 composites with promising photocatalytic activity were successfully prepared in this study. The structure and morphology of the as-prepared composites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS), and the photocatalytic activity was evaluated through the degradation of rhodamine B (RhB). It was found that the composites with 30 wt% MnFe 2 O 4 possessed 2.64 times higher photocatalytic activity than that of pure g-C 3 N 4 , and the degradation rate of 30 mg/L RhB solution could reach 97.2% in 90 min under 1 sun irradiation. The promising photocatalytic activity of the composites was mainly attributed to excellent adsorption performance and light absorption capacity of the sample. Simultaneously, the recombination of photogenerated electron-hole pairs was delayed due to the formation of heterojunction between MnFe 2 O 4 and g-C 3 N 4 , and MnFe 2 O 4 /g-C 3 N 4 showed almost no decrease in photocatalytic activity after recycling for five times.
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
Journal of Industrial Textiles
·
2022
·
IF 2.926
Xinghua Hong,Wei Sun,Tao Peng,Junnan Qian,Zhaofa Zhang,Chengyan Zhu,Guangmin Cai
Herein, a MnFe2O4/RGO knitted fabric derived from manganese waste was constructed by a simple in-situ assembled coating method, involving the incorporation of Graphene Oxide (GO) and manganese ferrite nanoparticles on polyester fabric, followed reducing by hydrazine hydrate. The reuse of manganese waste from the preparation of GO can reduce chemical waste emissions and endow the absorption performance. The coated particles possess certain magnetism can be attracted and securely collected in seconds, which is convenient for recycling. This fabric gives well microwave absorption with the maximum reflection loss (RL) of −58.6 dB at 9.1 GHz by a thickness of 1.9 mm. In addition, this fabric presents high stable strain sensing under 1000 stretching and bending cycles. Meanwhile, the resistance-deformation-velocity relationship is provided based on the structure, for the analysis of electromechanical behaviors. Moreover, the fabric has the capability for temperature sensing (TCR=−0.738%/°C), and fire alarm. As such, this fabric can be promising alternatives for a wide application on motion and temperature sensing, microwave blocking.
研究领域:
材料科学
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环境科学
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电子工程
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 33
·45588-45601
·
IF 0
Wu Haixia,Han Xiao,Guo Xinrui,Wen Yiyun,Zheng Bin,Liu Biming
The performance of catalytic ability of MFe 2 O 4 /MoS 2 in the ozonation process was investigated in this work. The synthesized MnFe 2 O 4 /MoS 2 was optimize prepared and then characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photo-electron spectroscopy, and magnetic saturation strength. The results showed that when C phenol = 200 mg/L, initial pH = 9.0, Q = 0.10 L/min, and C MnFe2O4/MoS2 = 0.10 g/L, MnFe 2 O 4 /MoS 2 addition improved the degradation efficiency of phenol by 20.0%. The effects of pH, catalyst dosage, and inorganic ions on the phenol removal by the MnFe 2 O 4 /MoS 2 catalytic ozonation were investigated. Five cycle experiments proved that MnFe 2 O 4 /MoS 2 had good recyclability and stability. MnFe 2 O 4 /MoS 2 also showed good catalytic performance in the treatment of coal chemical wastewater pesticide wastewater. The MnFe 2 O 4 doped with MoS 2 could provide abundant surface active sites for ozone and promote the stable cycle of Mn 2+ /Mn 3+ and Fe 2+ /Fe 3+ , thus generating large amounts of •OH and improving the degradation of phenol by ozonation. The MnFe 2 O 4 /MoS 2 /ozonation treatment system provides a technical reference and theoretical basis for industrial wastewater treatment.
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
TALANTA
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2017
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IF 4.162
Xing-Yu Long,Jia-Yuan Li,Dong Sheng,Hong-Zhen Lian
The spinel-type magnetic manganese ferrite (MnFe 2 O 4 ) microspheres synthesized by simple solvothermal method were used as a novel adsorbent for selective enrichment and effective isolation of phosphopeptides. The uniform MnFe 2 O 4 magnetic affinity microspheres (MAMSs) had a narrow particle size distribution between 250 and 260 nm, and displayed superparamagnetism with a saturation magnetization value of 67.0 emu/g. Comprehensively, the possible formation mechanism of MnFe 2 O 4 microspheres with ferric and manganous sources as dual precursors was elucidated by comparison with those of Fe 3 O 4 nanoparticles and MnOOH nanosheets respectively with either ferric or manganous source as single precursor. It was suggested that the spherical or sheet nanostructures could be achieved via secondary recrystallization or Ostwald ripening . The MnFe 2 O 4 MAMSs probe exhibited excellent dispersibility in aqueous solution, and rapid magnetic separation within 15 s, as well as good reusability. More importantly, MnFe 2 O 4 was highly selective for phosphopeptides because of the strong coordination interaction between metal ions (Fe 3+ and Mn 2+ ) and phosphate groups of phosphopeptdies. This high specificity was demonstrated by effectively enriching phosphopeptides from digest mixture of β -casein and bovine serum albumin (BSA) with high content of non-phosphopeptides, and embodied further in phosphopeptides enrichment from non-fat milk digests and human serum. Consequently, the prepared MnFe 2 O 4 affinity materials are expected to possess great potential in phosphoproteome research.
研究领域:
生物化学
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材料科学
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蛋白质组学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 11
·9378
·
IF 5.6
Xiaoyu Jiang,Qin Zhou,Yongfu Lian
In this work, the MnFe2O4/BGA (boron-doped graphene aerogel) composite prepared via the solvothermal method is applied as a photocatalyst to the degradation of tetracycline in the presence of peroxymonosulfate. The composite’s phase composition, morphology, valence state of elements, defect and pore structure were analyzed by XRD, SEM/TEM, XPS, Raman scattering and N2adsorption–desorption isotherms, respectively. Under the radiation of visible light, the experimental parameters, including the ratio of BGA to MnFe2O4, the dosages of MnFe2O4/BGA and PMS, and the initial pH and tetracycline concentration were optimized in line with the degradation of tetracycline. Under the optimized conditions, the degradation rate of tetracycline reached 92.15% within 60 min, whereas the degradation rate constant on MnFe2O4/BGA remained 4.1 × 10−2min−1, which was 1.93 and 1.56 times of those on BGA and MnFe2O4, respectively. The largely enhanced photocatalytic activity of the MnFe2O4/BGA composite over MnFe2O4and BGA could be ascribed to the formation of type I heterojunction on the interfaces of BGA and MnFe2O4, which leads to the efficient transfer and separation of photogenerated charge carriers. Transient photocurrent response and electrochemical impedance spectroscopy tests offered solid support to this assumption. In line with the active species trapping experiments, SO4•−and O2•−radicals are confirmed to play crucial roles in the rapid and efficient degradation of tetracycline, and accordingly, a photodegradation mechanism for the degradation of tetracycline on MnFe2O4/BGA is proposed.
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
Materials
·
2023
·Vol. 16
·期 24
·7636
·
IF 3.4
Binxian Gu,Haijie Zhang,Meng Ye,Ting Zhou,Jianjian Yi,Qingsong Hu
As a kind of emerging contaminant, organoarsenic compounds have drawn wide concern because of their considerable solubilities in water, and the highly toxic inorganic arsenic species formed during their biotic and abiotic degradation in the natural environment. Thus, the effective removal and studying of the adsorption mechanism of organoarsenic compounds are of significant urgency. In this work, MnFe2O4and MnFe2O4/graphene were prepared through a facile solvothermal method. From the results of the Transmission Electron Microscope (TEM) characterization, it can be found that MnFe2O4nanoparticles were uniformly distributed on the surface of the graphene. And the specific surface area of the MnFe2O4/graphene was about 146.39 m2g−1, much higher than that of the MnFe2O4(86.15 m2g−1). The interactions between organoarsenic compounds and adsorbents were conducted to study their adsorption behavior and mechanism. The maximum adsorption capacities of MnFe2O4/graphene towards p-arsanilic acid (p-ASA) and roxarsone (ROX) were calculated to be 22.75 and 30.59 mg g−1. Additionally, the ionic strength, negative ions, and humus were introduced to investigate the adsorption performance of organoarsenic compounds. Electrostatic adsorption and surface complexation are the primary adsorption mechanisms on account of X-ray photoelectron spectroscopy (XPS) and the Fourier-transform infrared spectroscopy (FT-IR) analysis. This research extends the knowledge into studying the interaction between organoarsenic species and hybrid nanomaterials in the natural environment.Keywords:MnFe2O4;graphene;adsorption;p-arsanilic acid;roxarsone
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Lei Yao,Chao Hong,Yangxu Qi,Lie Wu
In this study, we developed a novel magnetic composite of walnut shell biochar (WSB) and modified it with ZIF-7 for the purpose of removing Co 2+ ions. We conducted a comprehensive evaluation of its performance in Co 2+ removal, considering various factors such as contact time, temperature, adsorbent dose, pH, and initial Co 2+ concentration. Utilizing response surface methodology-central composite design (RSM-CCD), we examined the interactions between these variables. The specific surface area and magnetic saturation value of the WSB/MnFe 2 O 4 /ZIF-7 composite were determined as 170.560 m 2 .g −1 and 23.469 emu.g −1 , respectively. ANOVA analysis indicated that our model effectively captures the interactions between variables, with a high R 2 value of 0.9982, explaining 99.82 % of the experimental data. Optimal conditions for maximum Co 2+ adsorption efficiency (99.05 %) were identified as follows: a contact time of 44.82 min, pH of 6.04, adsorbent dose of 0.947 mg.L -1 , temperature of 25.55 °C, and Co 2+ concentration of 11.13 mg.g −1 . Kinetic studies revealed that the Pseudo 2nd order kinetic model provided the best fit to the experimental data. The negative entropy parameter indicated a decrease in disorderliness during the adsorption process, while the exothermic nature of adsorption was confirmed by enthalpy values of −92.751 and −40.511 kJ.mol −1 for WSB/MnFe 2 O 4 /ZIF-7 and WSB, respectively. Furthermore, the Langmuir isotherm model demonstrated excellent fitting to the isotherm results, suggesting the dominance of homogeneous surfaces in adsorption. The maximum adsorption capacities for Co 2+ using WSB/MnFe 2 O 4 /ZIF-7 and WSB were determined to be 29.26 and 22.39 mg.g −1 , respectively. The WSB/MnFe 2 O 4 /ZIF-7 magnetic composite demonstrates promising potential for efficiently removing Co 2+ from both natural water sources and industrial wastewater, highlighting its versatility and effectiveness in environmental remediation applications.
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 MAGNETISM AND MAGNETIC MATERIALS
·
2019
·
IF 2.683
Guangshuo Wang,Fei Zhou,Tianxiang Du,Ziwei Lu,Yingying Ma,Jingbo Mu,Yanming Wang,Zhixiao Zhang,Hongwei Che,Xiaoliang Zhang,Ruitao Yu
This study established a facile one-step strategy to anchor MnFe 2 O 4 nanoparticles on the surface of MoS 2 nanosheets in a controlled manner. The as-prepared MnFe 2 O 4 /MoS 2 nanocomposites were investigated by TEM, XRD, XPS, Raman, BET and VSM in detail. The MnFe 2 O 4 nanoparticles with an average particle size of 26 nm were densely and uniformly decorated on MoS 2 nanosheets, and consequently, both the aggregation of MnFe 2 O 4 nanoparticles and restacking of MoS 2 nanosheets were effectively prevented. More importantly, the MnFe 2 O 4 /MoS 2 nanocomposites exhibited high specific surface area, typical superparamagnetic behavior and excellent solution dispersion, showing a great potential for biomedical applications in the fields of magnetic resonance imaging, targeted drug delivery and tumor hyperthermia.
研究领域:
材料科学
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纳米技术
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生物医学工程
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产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
IF 4.217
Fu He,Yong Ji,Yang Wang,Yun Zhang
Nanoscale zerovalent iron (nZVI) loaded magnetic hollow mesoporous bimetallic Fenton-like catalyst, Fe 0 @C@MnFe 2 O 4 , was prepared by a one-pot solvothermal method. Carbon shell of polydopamine (PDA) was formed through self-oxidation of dopamine by adding MnFe 2 O 4 hollow spheres into dopamine solutions. Then Fe 2+ ions were adsorbed on the surface of PDA@MnFe 2 O 4 to obtain active nZVI in-situ through subsequent calcinations. Thus, the mesoporous carbon shell of Fe 0 @C@MnFe 2 O 4 had a great contribution to high adsorption capacity for concentrating TBBPA around the catalyst. The high concentration of TBBPA outside would further facilitate the transportation to the inside of the hollow catalyst to achieve a high catalytic efficiency. Fe 0 @C@MnFe 2 O 4 , as an integrated adsorbent-catalyst, was used to remove Tetrabromobisphenol A (TBBPA) in aqueous solution with the presence of H 2 O 2 and NH 2 OH. Over 90% of TBBPA can be removed within 120 min. According to the result of ESI–MS, β -scission and debromination were involved in the degradation of TBBPA. The reused catalyst could be easily separated by using an external magnetic field in seconds. After ten cycles, the catalyst was still of good activity. The excellent removal efficiency of TBBPA might be attributed to the synergistic effect from high adsorption capacity and efficient Fenton-like catalytic reaction of Fe 0 @C@MnFe 2 O 4 .
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2016
·
IF 4.839
Na Li,Fenglian Fu,Jianwei Lu,Zecong Ding,Bing Tang,Jiabin Pang
Chromium-contaminated water is regarded as one of the biggest threats to human health. In this study, a novel magnetic mesoporous MnFe 2 O 4 @SiO 2 −CTAB composite was prepared by a facile one-step modification method and applied to remove Cr(VI). X-ray diffraction, scanning electron microscopy, transmission electron microscopy , specific surface area, and vibrating sample magnetometer were used to characterize MnFe 2 O 4 @SiO 2 −CTAB composites. The morphology analysis showed that the composites displayed a core-shell structure. The outer shell was mesoporous silica with CTAB and the core was MnFe 2 O 4 nanoparticles , which ensured the easy separation by an external magnetic field. The performance of MnFe 2 O 4 @SiO 2 −CTAB composites in Cr(VI) removal was far better than that of bare MnFe 2 O 4 nanoparticles. There were two reasons for the effective removal of Cr(VI) by MnFe 2 O 4 @SiO 2 −CTAB composites: (1) mesoporous silica shell with abundant CTA + significantly enhanced the Cr(VI) adsorption capacity of the composites; (2) a portion of Cr(VI) was reduced to less toxic Cr(III) by MnFe 2 O 4 , followed by Cr(III) immobilized on MnFe 2 O 4 @SiO 2 −CTAB composites, which had been demonstrated by X-ray photoelectron spectroscopy results. The adsorption of Cr(VI) onto MnFe 2 O 4 @SiO 2 −CTAB followed the Freundlich isotherm model and pseudo-second-order model. Tests on the regeneration and reuse of the composites were performed. The removal efficiency of Cr(VI) still retained 92.4% in the sixth cycle. MnFe 2 O 4 @SiO 2 −CTAB composites exhibited a great potential for the removal of Cr(VI) from water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）