INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Hang Li,Yi Zhai,Xubin Zhang,Guojun Lv,Yu Shen,Xuqing Wang,Tao Jiang,Yuzhou Wu
Hierarchical iron-containing TS-1 zeolites (FTS) were successfully synthesized via post-treatment desilication over microporous Fe-TS-1, which were prepared through a one-step hydrothermal synthesis. The prepared samples were characterized by X-ray diffraction, N2 adsorption–desorption, field-emission scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, ultraviolet visible spectroscopy, and X-ray fluorescence spectrometry. The experimental results illustrated that the MFI structure of all the FTS samples remained unchanged after NaOH desilication and acid treatment. The newly created mesopores can be controlled by changing the amount of framework Fe, as the extraction of Si could be affected because of the inhibitory effect of iron species during the desilication process. The catalytic performance of the prepared samples in phenol hydroxylation with H2O2 was investigated. Among all the samples, FTS-50-D showed a highest phenol conversion of 45.2% and a dihydroxybenzene selectivity of 95.2%. Besides, FTS-50-D also showed good reusability for five recycling tests.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
International Journal of Mining Science and Technology
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2024
·
IF 11.7
Lingyun Liu,Chuilei Kong,Hongyu Zhao,Fangqin Lu
This study delves into the intricate relationship between iron (Fe) content in kaolinite and its impact on the adsorption behavior of sodium oleate. The effects of different iron concentrations on adsorption energy, hydrogen bond kinetics and adsorption efficiency were studied through simulation and experimental verification. The results show that the presence of iron in the kaolinite structure significantly improves the adsorption capacity of sodium oleate. Kaolinite samples with high iron content have better adsorption properties, lower adsorption energy levels and shorter and stronger hydrogen bonds than pure kaolinite. The optimal concentration of oleic acid ions for achieving maximum adsorption efficiency was identified as 1.2 mmol/L across different kaolinite samples. At this concentration, the adsorption rates and capacities reach their peak, with Fe-enriched kaolinite samples exhibiting notably higher flotation recovery rates. This optimal concentration represents a balance between sufficient oleic acid ion availability for surface interactions and the prevention of self-aggregation phenomena that could hinder adsorption. This study offers promising avenues for optimizing the flotation process in mineral processing applications.
研究领域:
矿物加工工程
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理论化学
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产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2025
·
IF 6.2
Mingqiang Chen,Quan Wang,Defang Liang,Yishuang Wang,Chang Li,Xuemei Shen,Chunyue cheng,Jun Wang
Herein, a series of Fe-based biochar catalysts (xFe/WSBC) were synthesised via impregnation using wheat straw as a carbon precursor and applied to the Fischer–Tropsch synthesis of olefins (FTO) from syngas. Various characterisations of fresh catalysts demonstrated that Fe content significantly affected the dispersion of iron particles and the surface distribution of Fe 3 + /Fe 2+ . Among the samples, 5Fe/WSBC exhibited the highest surface Fe 3+ /Fe 2+ ratio and thus the lowest surface electron density, which enhanced the adsorption and activation of H 2 . In addition, an appropriate amount of the Fe additive (5 wt%) significantly decreased the Fe 3 O 4 particle size, which promoted the continuous reduction and carbonisation processes during FTO to generate iron carbide phases, which boosted CO activation and the subsequent C–C coupling. Therefore, 5Fe/WSBC exhibited the highest CO conversion (46.9 %) and iron time yield (348.9 μmol CO ·g Fe −1 ·s −1 ) as well as the major enhancement of selectivity to light olefins (C 2 = –C 4 = ). The results for the used catalysts demonstrated that 5 wt% Fe clearly inhibited the sintering of iron particle size and improved the catalytic stability of FTO.
研究领域:
催化化学
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能源科学
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环境工程
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产品关联
DOI
高影响因子
Analytical Methods
·
2015
·Vol. 8
·期 6
·1239-1248
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IF 1.821
Shaolin Li,Yangyang Ding,Wei Wang,Hong Lei
Zero valent iron (ZVI) is increasingly used in large quantities for water treatment. In large-scale application of ZVI, a common question that engineers encounter is ZVI selection or its quality assurance and quality control (QA/QC). A facile method for assessing ZVI quality is proposed and studied in this work. The method is based on the Fe(III)–Fe(0) reaction that has a fast reaction rate, a known and simple stoichiometry, and an easy-to-assay product. The method is conducted by mixing the sample (e.g., testing ZVI) with concentrated Fe(III) solution (up to 3.0 g L−1) for 3–4 hours. The metallic iron (Fe(0)) content of the sample is obtained by assaying the final increase of the total dissolved iron, and its reactivity is quantified using the observed dissolution rate constants. The method is experimentally validated using 23 iron-based materials. Studies with reference iron powder and iron oxide demonstrate that the Fe(III) solution has satisfactory specificity in selecting Fe(0). Replicate experiments and t-test evaluation show the complete dissolution of the Fe(0) content in micron-scale ZVI and the high reproducibility of the method for measuring Fe(0). The accuracy and reliability of the method are studied using 15 commercial ZVIs of known Fe(0) purity, in a series of experiments using Fe(III), Cu(II) or trichloroethylene. The experiments show that the results from the proposed method are accurate and reliable, and that the method is a strong tool more effective than conventional techniques such as X-ray diffraction and BET-N2 adsorption. This work provides an easy and facile way for the quantitative assessment of the quality of metallic iron used for environmental clean-up, especially for the quick survey of a large number of iron samples on site. The method may also serve as a QA/QC procedure for ZVI in industrial-scale production.
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
Desalination and Water Treatment
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2024
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IF 1
Liang Zhou,Hongjian Li,Jinqu Wang,Runlin Han
FeAlPO-34 molecular sieves with tunable iron contents were synthesized in a 1-butyl-3-methylimidazolium bromide [BMIm] Br ionic liquid. The added Fe 3+ was successfully incorporated into the AlPO-34 framework, which mainly presents in tetrahedral and octahedral sites in the framework, with up to 10.28 wt.% of isolated iron contents. The iron contents directly influenced the crystal size and morphology, mesoporous properties. A sample with relatively high iron contents and a hierarchical structure shows excellent catalytic performances when utilized as the catalyst of phenol hydroxylation reaction. The sample with 6.09 wt.% Fe showed a 41.55% of phenol conversion with the selectivity of 92.72 to hydroquinone and catechol.
研究领域:
材料科学
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催化化学
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无机合成
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
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2018
·Vol. 51
·期 29
·295107
·
IF 2.373
Jun Zhang,Jun Liao,Lexi Shao,Shuwen Xue,Zhiguo Wang
High quality micron-sized Cu2FexZn1−xSnS4 single crystals have been successfully fabricated by flux growth method using CuS, FeS, ZnS and SnS as the raw materials and CsCl as the fluxing agent. The effects of Fe contents on the morphology, structure and optical properties of Cu2FexZn1−xSnS4 single crystals were investigated. X-ray diffraction and Raman analyses reveal that the kesterite and stannite phases coexist in the Cu2FexZn1−xSnS4 crystals, and peak splittings of (2 0 4) and (3 1 2) are observed for the sample with x = 0.2. The optical absorption spectra reveal that the optical bandgap of the single crystal samples has little dependence on the Fe content due to the coexistence of the kesterite and stannite phases. The bandgap of the Cu2FexZn1−xSnS4 single crystal generally locates between 1.672 and 1.716 eV. Though the bandgap is not ideal as the absorber for single-junction solar cells according to the S–Q limit, it is an ideal material for the top cell in tandem solar cells and solar-driven water splitting.
研究领域:
材料科学
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物理化学
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产品关联
DOI
高影响因子
RARE METALS
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2025
·
IF 11
Liu Wen-Jiao,Li Yu-Jia,Ding Rui-Fang,Zhang Hui,Hao Yan-Qing,Liu Yang,Wang Lan-Fang,Xu Xiao-Hong
The fundamental research and potential applications of magnetic two-dimensional (2D) ternary chalcogenides in spintronics have garnered considerable interest. Lessening the thickness of non-van der Waals (nvdWs) ternary chalcogenides to 2D structures can bring about novel physical phenomena and contribute to their potential applications in spintronics. In this paper, a template-mediated chemical synthesis was proposed to prepare nvdWs 2D micrometer-sized CuFeSeS composite nanosheets. Specifically, free-standing 2D nvdWs hexagonal CuFeSeS with a mean size of 2.6 μm was successfully achieved. The anisotropic growth of CuFeSeS was induced by the confinement effect of the template. Inspiringly, the 2D hexagonal CuFeSeS nanosheets with higher Fe content exhibit intrinsic ferromagnetic order, with a huge coercivity ( H C ) of 10.99 kOe at 5 K. The magnetism is regulated by varying the Fe content and reaction temperature. The valence changes of Fe, which form the ferromagnetic Fe 7 S 8 phase, play a crucial role in the magnetic transitions. This work enlightens the synthesis of 2D nvdWs ternary chalcogenides and promotes the potential applications of 2D hexagonal CuFeSeS nanosheets in spintronics. Graphical abstract
研究领域:
材料科学
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凝聚态物理
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2025
·
IF 7.9
Xiu He,Huang Zhou,Xingchan Qian,Jiaji Ma,Pengjie Xian,Shiwei Liang,Liang Wang,Jingjing Fu
Sluggish extracellular electron transfer between microorganisms and electrodes has posed a significant challenge in the industrialization of microbial fuel cells (MFCs). Iron compound anodes boost MFC output power, but the underlying mechanisms that govern this enhancement have remained largely unexplored. Herein, we utilize polyacrylonitrile and ferrocene as raw materials to produce iron-incorporated carbon nanofiber materials as MFC anodes, employing electrostatic spinning and high-temperature carbonization. The application of ferrocene enables the introduction of iron into the fibers, which significantly promotes bacterial enrichment and electron transfer. The electroactive biofilm loading and number of live bacteria increase significantly on the fiber with high iron content, facilitating the formation of a continuous biofilm. The carbon nanofiber derived from a PAN/ferrocene composite with a 5:1 wt ratio exhibits optimal performance, attributed to the iron content. This material significantly outperforms carbon fabric, delivering a 13-fold enhancement (1296 mW m −2 ) in maximum power density when utilized as the anode in MFCs. We have examined the interfacial electron transfer process in MFCs, and determined that it is influenced by variations in iron content and fiber diameter. These findings offer valuable insights into the design of fiber electrodes for MFCs and other devices used in bio-electrochemical systems.
研究领域:
环境科学
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材料科学
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微生物学
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产品关联
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2018
·Vol. 125
·期 2
·1055-1070
·
IF 1.515
Zhao Xinhong,Duan Weiting,Zhang Xiaoxiao,Ji Dong,Zhao Yu,Li Guixian
A modified solvent-free method has been developed to synthesize FeAPO-5 zeolite catalysts with hierarchical porous structure as well as high crystallinity and iron content. The effects of mechanochemical and low-temperature pretreatment, as well as the addition of hydrogen peroxide and seed crystals on the synthesis of FeAPO-5 were studied in detail. The composition and structural features of relatively pure resultant products were deeply analyzed by XRD, SEM, ICP-AES, CHN analysis, TG–DTA, UV–Vis diffuse reflectance spectroscopy and N 2 physisorption. Most importantly, low-temperature pretreatment towards H 2 O 2 -containing precursor mixtures can to a great degree improve the crystallinity of FeAPO-5 molecular sieve. Significantly, compared to the conventional micron-sized microporous FeAPO-5 zeolite, the hierarchical FeAPO-5 catalysts created by this modified solvent-free method show superior performance in phenol hydroxylation, in which the one with a high content of framework iron species exhibits the best catalytic performance, giving phenol conversion of about 40% and dihydroxybenzene selectivity of up to 80% at 50 °C within 3 h reaction time.
研究领域:
化学工程
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催化材料科学
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Kaige Zhang,Rong Guo,Yunhe Wang,Qiujun Nie,Guifen Zhu
In our work, hydrophobic thymol-based deep eutectic solvents (DESs) with strong reducibility, a lower density than water, and a slightly higher melting point than room temperature were synthesized. Based on these solid DESs, one-step derivatization and temperature-controlled vortex-assisted liquid-liquid microextraction based on the solidification of a floating DES (TC-VA-LLME-SFDES) via UV–Vis spectrophotometry for the rapid determination of total iron was developed. The derivatization and TC-VA-LLME were carried out simultaneously by the addition of DES as both the reducing agent and extraction solvent. After optimization, the calibration curve (5–250 μg L −1 , R 2 = 0.9982), limit of detection (1.5 μg L −1 ), limit of quantitation (5.0 μg L −1 ), precision (≤4.0%) and enrichment factor (92) was obtained. This method was applied for the determination of total iron in water and food samples with satisfactory recoveries (85.4–106.2%). One-step derivatization and TC-VA-LLME only required 2 min. Furthermore, this method opened up the application of solid DESs in liquid–liquid microextraction.
研究领域:
分析化学
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环境科学
·
食品科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Tao He,Xuemei Pan,Wenguang Zhou,Huijun Ding,Mengting Liu,Mingxue Xiang,Qian Lou,Liu Han,Yan Zhang,Yixiao Wu,Yiling Chen
Pyrolytic reduction as an effective method is generally employed for synthesizing zero-valent iron @ biochar composite (ZVI@BC). However, it suffers from intractable obstacles, such as poor zero-valent iron (ZVI) dispersibility and low α-iron (α-Fe 0 ) content. Herein, we reported a possible way to target the dilemma for the first time, i.e., adding ammonium bicarbonate (NH 4 HCO 3 ) pretreatment step before pyrolytic reduction. In detail, the special NH 4 HCO 3 not only served as a precipitant to uniformly disperse ZVI over biochar by gradually releasing OH – , but also as a reductant to facilitate γ-Fe 0 transforming to α-Fe 0 in ZVI (∼71 %) via providing sufficient NH 3 . Besides, NH-ZVI@BC 3/1/5 exhibited outstanding oxytetracycline hydrochloride (OTC) removal ability (∼2869.1 mg/g), with the removal efficiency of 99.0 % at the dosage of 0.05 g/L. The removal mechanism was investigated which involved adsorption dominated by complexation, π-π electron donor acceptor interaction, hydrogen bonds, and electrostatic interactions. As well, OTC degradation was achieved by [H] and ·OH resulting from Fe-C micro-electrolysis and Fenton-like reaction during the corrosion of ZVI in ZVI@BC, respectively. In addition, four possible degradation pathways were proposed, and the contribution role in OTC removal followed the sequence: adsorption > degradation involved with [H] > degradation involved with ·OH. Moreover, N-ZVI@Biochar 3/1/5 exhibited easy separability, excellent reusability, and well practical applicability. Overall, this work not only opens a new avenue for the fabrication of ZVI@BC with high ZVI dispersibility and content of α-Fe 0 , but also shed light on the environmental remediation of antibiotics.
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
Biomedical Materials
·
2024
·
IF 3.9
Chen Huang,Wentao Huang,Yixuan Meng,Chengqian Zhou,Xiaozhuan Wang,Chunyu Zhang,Yuzhen Tian,Wei Wei,Yongsheng Li,Quan Zhou,Yukuan Tang,Wenli Chen
Atherosclerosis is a chronic inflammatory disease characterized by the accumulation of cholesterol within the arterial wall. Its progression can be monitored via magnetic resonance imaging (MRI). Ultrasmall Superparamagnetic Particles of Iron Oxide (USPIO) (<5 nm) have been employed as T1 contrast agents for MRI applications. In this study, we synthesized USPIO with an average surface carboxylation of approximately 5.28 nm and a Zeta potential of -47.8 mV. These particles were phagocytosed by mouse aortic endothelial cells (USPIO-MAECs) and endothelial progenitor cells (USPIO-EPCs), suggesting that they can be utilized as potential contrast agent and delivery vehicle for the early detection of atherosclerosis. However, the mechanism by which this contrast agent is delivered to the plaque remains undetermined. Our results demonstrated that with increasing USPIO concentration during 10-100 μg/mL, consistent change appeared in signal enhancement on T1-weighted MRI. Similarly, T1-weighted MRI of MAECs and EPCs treated with these concentra-tions exhibited a regular change in signal enhancement. Prussian blue staining of USPIO revealed substantial absorption into MAECs and EPCs after treatment with 50 μg/mL USPIO for 24 h. The iron content in USPIO-EPCs was much higher (5 pg Fe/cell) than in USPIO-MAECs (0.8 pg Fe/cell). Our results confirmed that macrophages are more likely to bind to MAECs treated with AuNPs-PEI-siRNANC (control) for 72 h than to MAECs treated with AuNPs-PEI-siRNACD40 (reduced CD40 expression), thus confirming CD40 targeting at the cellular level. When USPIO-MAECs and MAECs (control) were delivered to mice (high-fat-fed) via tail vein injection respectively, we observed a higher iron accumulation in plaques on blood vessels in high-fat-fed mice treated with USPIO-MAECs. We also demonstrated that USPIO-EPCs, when delivered to high-fat-fed mice via tail vein injection, could indeed label plaques by generating higher T1-weighted MRI signals 72 h post injection compared to controls (PBS, USPIO and EPCs alone).
In conclusion, we synthesized a USPIO suitable for T1-weighted MRI. Our results have confirmed separately at the cellular and tissue and in vivo level, that USPIO-MAECs or USPIO-EPCs are more accessible to atherosclerotic plaques in a mouse model. Furthermore, the high expression of CD40 on the cell surface is a key factor for targeting and USPIO-EPCs may have potential therapeutic effects.
研究领域:
医学影像
·
心血管疾病
·
分子生物学
·
纳米技术
✓ 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）