Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Ayesha Idrees,Ali Shan,Waqas Qamar Zaman,Ali Mohsin,Zain Abbas,Tanvir Shahzad,Atif Shakeel,Shuguang Lyu
M-metal (Ca and Cu) doped Ca-Fe 2 O 3 and Cu-Fe 2 O 3 catalysts were synthesized using solvothermal method. The Ca-Fe 2 O 3 and Cu-Fe 2 O 3 catalysts were characterized by XRD, Raman spectroscopy , SEM , TEM and XPS spectroscopy. The catalytic performance of 6%Ca-Fe 2 O 3 and 5%Cu-Fe 2 O 3 catalysts for trichloroethylene (TCE) removal were improved by M-metal doping leading to TCE removal at 99.8% in 1 h, which were three folds greater than by simple a- Fe 2 O 3 in the presence of persulfate (PS). Ca and Cu doping formed defective structure and created more oxygen vacancies thereby generating abundant active species during PS activation process. Further, the influence of catalysts’ dosage, oxidant dosage, solution pH, inorganic anions, and dissolved oxygen were evaluated. Complete removal of TCE was also obtained at weak alkaline pH condition. The greater specific surface area and the improved electrical conductivity was attributed to the huge generation of O 2 •– and 1 O 2 species which played major part in TCE removal. Scavenging tests and ESR spectroscopy confirmed the dominant role of O 2 •– and 1 O 2 in TCE degradation. The stability and viability of 6%Ca-Fe 2 O 3 and 5%Cu-Fe 2 O 3 catalysts were evaluated by repetition tests and in the presence of surfactants, TCE removal in real water matrix, and in the degradation of multi-pollutants.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 5
·1858-1864
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IF 3.288
Zongkai Wu,Jiangfeng Pei,Xiuduo Song,Ning Liu,Jianguo Li,Ming Zhang,Jun Zhang,Dongxiang Zhang,Fengqi Zhao
The DSC-TG-MS-FTIR coupling technique and in situ FTIR technique were used to study the catalytic effects of nano-Fe2O3 and rGO–Fe2O3 on the thermal decomposition behaviors of CL-20/HMX cocrystals. The results showed nano-Fe2O3 having a good catalytic effect on the thermal decomposition of the CL-20/HMX cocrystal. Nano-Fe2O3 was found to enhance CO2 production and prevent the production of NH2+, HCN, and CHO or N2H+ during the decomposition of cocrystalline CL-20/HMX. Meanwhile, both the CL-20/HMX thermal decomposition peak temperature and Ea were reduced by including nano-Fe2O3. The inclusion of rGO–Fe2O3 did not enhance the catalytic effect of nano-Fe2O3, but did reduce residue formation during the CL-20/HMX decomposition process. Breaking of N–N bonds and the release of NO2 were concluded to constitute the initial steps of the decomposition of the CL-20/HMX cocrystal. This investigation has contributed to our understanding of the thermal decomposition of the CL-20/HMX cocrystal and provides guidance for the catalytic decomposition of energetic material cocrystals.
研究领域:
材料科学
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化学动力学
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能量材料
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DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2022
·Vol. 23
·期 16
·9362
·
IF 6.208
Chenzhi Zhang,Dashuang Wang,Lichao Dong,Kailin Li,Yifan Zhang,Pingan Yang,Shuang Yi,Xingjian Dai,Changqing Yin,Zhilan Du,Xinfang Zhang,Quan Zhou,Zhiyu Yi,Jinsong Rao,Yuxin Zhang
A neoteric round sieve diatomite (De) decorated with sea-urchin-like alpha-type iron trioxide (α-Fe2O3) synthetics was prepared by the hydrothermal method and further calcination. The results of the electromagnetic (EM) parameters of α-Fe2O3-decorated De (α-Fe2O3@D) showed that the minimum reflection loss (RLmin) of α-Fe2O3@D could reach −54.2 dB at 11.52 GHz and the matched absorber thickness was 3 mm. The frequency bandwidth corresponding to the microwave RL value below −20 dB was up to 8.24 GHz (9.76–18 GHz). This indicates that α-Fe2O3@D composite can be a lightweight and stable material; because of the low density of De (1.9–2.3 g/cm3), the density of α-Fe2O3@D composite material is lower than that of α-Fe2O3(5.18 g/cm3). We found that the combination of the magnetic loss of sea-urchin-like α-Fe2O3and the dielectric loss of De has the most dominant role in electromagnetic wave absorption and loss. We focused on comparing the absorbing properties before and after the formation of sea-urchin-like α-Fe2O3and explain in detail the effects of the structure and crystal shape of this novel composite on the absorbing properties.Keywords:diatomite;α-Fe2O3;microwave absorption
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CANADIAN METALLURGICAL QUARTERLY
·
2023
·
IF 0.9
Lei He,Jiahao Liu,Tu Hu,Tingting Lv,Li Gao
The critical factor for smooth slag discharge has been found to be the viscosity characteristics of the molten slag. Molten slag cannot reach the condition for slag trapping owing to its high Fe2O3 contents. In the process of high temperature oxidation melting, the influence of Fe2O3 contents on molten slag viscosity behaviour is not clear. Therefore, the effect of Fe2O3 contents on molten slag viscosity-temperature behaviour was studied in the paper. With the Fe2O3 contents increased, at constant temperature, the molten slag viscosity was found to decrease. In addition, a linear relationship was established between lnη and 1/RT at elevated temperatures. The molten slag structure has been characterised to show that the degree of polymerisation decreases with increasing Fe2O3 contents. The calculated Λ, NBO/T and Q were also consistent with Raman analysis. This suggested that Fe2O3 contents affected the molten slag structure, resulting in the changes of molten slag viscosity. In the cooling process, as the increasing Fe2O3 ratio, the tendency of crystallization is enhanced. In short, molten slag viscosity and crystallization behaviour can be changed by controlling Fe2O3 contents. These findings could provide a guidance for adjusting Fe2O3 contents to improve the molten slag viscosity behaviour.Effets de la teneur en Fe2O3 sur le comportement de la viscosité des scories fondues Il a été constaté que le facteur critique pour une évacuation sans accroc des scories réside dans les caractéristiques de viscosité des scories fondues. Les scories fondues ne peuvent pas atteindre les conditions de piégeage des scories en raison de leur teneur élevée en Fe2O3. Dans le procédé de fusion par oxydation à haute température, l’influence de la teneur en Fe2O3 sur le comportement de la viscosité des scories fondues n’est pas claire. Par conséquent, il est d’une grande importance d’explorer l’influence de la teneur en Fe2O3 sur le comportement de la viscosité des scories fondues. Dans l’article, on a étudié l’effet de la teneur en Fe2O3 sur le comportement viscosité-température des scories fondues. Avec l’augmentation de la teneur en Fe2O3, à température constante, la viscosité des scories fondues diminue. De plus, on a établi une relation linéaire entre lnη et 1/RT à hautes températures. On a caractérisé la structure des scories fondues pour montrer que le degré de polymérisation diminue avec l’augmentation de la teneur en Fe2O3. Les valeurs Λ, NBO/T et Q calculées étaient également en accord avec l’analyse Raman. Cela suggère que la teneur en Fe2O3 affecte la structure des scories fondues, ayant pour résultat des changements dans la viscosité des scories fondues. Dans le procédé de refroidissement, avec l’augmentation du rapport de Fe2O3, la tendance à la cristallisation est renforcée. En bref, on peut modifier la viscosité des scories fondues et leur comportement de cristallisation en contrôlant la teneur en Fe2O3. Ces résultats pourraient fournir une orientation pour ajuster la teneur en Fe2O3 afin d’améliorer le comportement de la viscosité des scories fondues.
研究领域:
冶金学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2025
·
IF 7.9
Mengjiao Jiao,Yang Zhang,Guishang Pei,Zhuoyang Li,Xuewei Lv
This study focused on the high-temperature phase equilibrium of the Fe 2 O 3 -TiO 2 system by employing the classic phase equilibration and quenching method, X-ray diffraction, electron-probe microanalysis, and thermal analysis experiments. The solubility of the hematite, pseudobrookite, and rutile phases as the equilibrium temperature rose from 1100 °C to 1450 °C was determined. Besides, the solubility of TiO 2 in the spinel phase at 1450 °C was verified by experiments. A comprehensive comparison with the phase diagram optimized by Panda indicates that the solubility of solid solutions involved in the Fe 2 O 3 -TiO 2 system should be larger than the predicted one. Additionally, the ordered rutile phase was transformed into the high-temperature rutile-derived crystallographic shear structure at 1400 °C with Fe 2 O 3 higher than 15 mol%. Furthermore, the eutectic reaction of liquid → pseudobrookite + rutile occurred at 1512 °C. The liquidus was determined to be 1512 °C and 1535 °C at 30 and 75 mol% of TiO 2 , respectively. These measured phase equilibrium data are expected to provide reliable input for future thermodynamic reassessments of the Fe 2 O 3 -TiO 2 system within the CALPHAD framework.
研究领域:
材料科学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2020
·Vol. 10
·期 9
·1027
·
IF 3.52
Binxiang Cai,Huazhang Liu,Wenfeng Han
Fe2O3-based catalysts were prepared by solution combustion synthesis (SCS) with metal nitrates (Fe, K, Al, Ca) as the precursors and glycine as the fuel. The activities of catalysts were evaluated in terms of ammonia synthesis reaction rate in a fixed bed reactor similar to the industrial reactors. The results indicate that the precursor of catalyst prepared by SCS is Fe2O3which facilitates the high dispersion of promoters to provide high activity. The catalysts exhibit higher activity for ammonia synthesis than that of traditional catalysts, and the reaction rate reaches 138.5 mmol g−1h−1. Fe2O3prepared by SCS could be favorable precursor for ammonia synthesis catalyst. The present study provides a pathway to prepare catalyst for ammonia synthesis.Keywords:ammonia synthesis;catalyst;Fe2O3;solution combustion synthesis
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 61
·35372-35383
·
IF 3.049
Fang Wang,Le Xin Song,Yue Teng,Juan Xia,Zhe Yuan Xu,Wei Ping Wang
In this work, a simple one-step hydrothermal method was developed to synthesize high-quality α-Fe2O3 nanoparticles with a snowflake-like microstructure. First, a series of binary supramolecular aggregates were prepared by a non-covalent combination between a polymer such as polyvinylpyrrolidone (PVP) and a complex such as potassium ferrocyanide (PF). Then, the aggregates were used as the precursors of the one-step hydrothermal reactions. The snowflake-like nanostructure has six-fold symmetry as a whole, and each petal is symmetric. This synthesis method has the characteristics of simplicity, rapidity, reliance, and high yield, and can be used for creating high-quality α-Fe2O3 nanoparticles. Moreover, our results show that the molar ratio of PVP to PF, reaction time and temperature play important roles in the generation of a complete snowflake structure from different angles. Also, the snowflake-like α-Fe2O3 nanostructure exhibits a much higher coercivity (2997 Oe) compared to those reported by others, suggesting a strong hysteresis behaviour, which promises potential applications in memory devices, and other fields. Further, the α-Fe2O3 nanosnowflakes show a much higher photocatalytic degradation activity for cationic organic dyes such as crystal violet, rhodamine 6G than for anionic dyes such as methyl orange. A possible photocatalytic mechanism was proposed for explaining the selectivity of the photocatalytic oxidation reaction of organic dyes. We believe that this study provides a direct link among coordination compounds of transition metals, their supramolecular aggregates with polymers, and controlled hydrothermal synthesis of high-quality inorganic metal oxide nanomaterials.
研究领域:
材料科学
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化学
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纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2024
·
IF 4.3
Mohan Huang,Kun Zhao,Shuangyan Liu,Ang Bian,Lu Jiang,Dawei He,Jiaqi He,Yongsheng Wang
The design and development of microwave-absorbing materials with excellent performance hold significant importance in both civil and military fields. The combination of magnetic loss materials and dielectric loss materials can achieve complementary performance effects and regulate impedance matching. In this paper, spindle-like α-Fe 2 O 3 was synthesized using MIL-88A as a template, which was then composited with Ti 3 C 2 T x phase possessing excellent electrical conductivity to obtain Fe 2 O 3 /Ti 3 C 2 T x composites. Ti 3 C 2 T x can provide good conductance loss and dipole polarization relaxation, while the incorporation of Fe 2 O 3 between the layers of Ti 3 C 2 T x not only triggers the interfacial polarization effect but also increases layer spacing, thereby enhancing multiple reflection effects. Furthermore, the magnetic-dielectric synergies further optimize the impedance matching. Through the combined action of multiple mechanisms, the Fe 2 O 3 /Ti 3 C 2 T x composites (with a mass ratio of 1:3 for Fe 2 O 3 and Ti 3 C 2 T x ) exhibit a minimum reflection loss of −34 dB and an effective absorption bandwidth of 1.53 GHz at a thickness of 3 mm, as well as an effective absorption bandwidth of 2.805 GHz at a thickness of 1.5 mm. This paper presents a reference strategy for constructing highly efficient microwave absorbers derived from Metal-organic frameworks (MOFs) and MXene based on their outstanding properties.
研究领域:
材料科学
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电磁学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2018
·
IF 1.666
Hanjiang Xu,Xiaoping Zhang,Yudong Zhang
The biochar produced by pyrolysis at 600°C from powdered mango bark impregnated with iron, namely Fe2O3/biochar, was recognized as a multifunctional material for environmental applications. This work aims at using the above material for the removal of pyridine and quinoline from aqueous solutions. The physico-chemical properties of synthesized biochars were studied systematically with several commonly used material characterization methods including scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and Fourier transform infrared spectrometer (FTIR). Structural and morphological analyses of the biochars showed that Fe2O3 particles were nanosized and distributed evenly on the surface of biochar, and thus exhibited great adsorption capacity for the removal of pyridine and quinoline. In addition, the results suggested that the main magnetic phase is maghemite (Fe2O3). The modified biochar showed high removal capacity (99%) for quinoline, but the removal capacity of pyridine was only 73%. The pH experiment in this passage indicated that both pyridine and quinoline reached a maximum adsorption amount at pH near 9.0. Adsorption kinetics suggested that the pseudo-second-order was well fitting the experiment data. The equilibrium study showed that the Langmuir model can adequately describe the adsorption process for pyridine and quinoline. The main mechanism of pyridine and quinoline removal was possibly electrostatic interactions and π–π interactions between the modified biochar and the adsorbate.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Electronics
·
2025
·Vol. 14
·期 5
·1050
·
IF 2.6
Xiang Gao,Ying Chen,Pengcheng Xu,Dan Zheng,Xinxin Li
The selective detection of propane gas molecules using semiconductor gas sensors has always been a challenge within research. In this study, we successfully synthesized a γ-Fe2O3nanomaterial with a selective catalytic effect on propane and loaded it onto a ZnO sensing material to construct a double-layer microsensor, which showed good sensing response characteristics in the detection of the refrigerant R290 (which is mainly propane). In addition, we also prepared a series of iron oxides, including nanomaterials such as α-Fe2O3, Fe3O4, and FeO, as well as γ-Fe2O3materials with different specific surface areas obtained at various processing temperatures, and we carried out gas sensing research on R290. The results show that the γ-Fe2O3material has a better sensitivity to R290, and the γ-Fe2O3material calcined at 200 °C shows the best performance. Our results can provide a theoretical basis for the design and optimization of semiconductor gas sensors for alkane detection.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Zi-Han Zhang,Tao Yang,Ze-Yuan Wang,Hai-Chao Wang,Xin-Zheng Yue,Sha-Sha Yi
The photoelectrochemical (PEC) performance of hematite ( α -Fe 2 O 3 )-based photoanodes is still far from its theoretical value because they are constrained by serious charge recombination and sluggish water oxidation kinetics. Herein, we developed a heterostructural photoanode by coating boron doped graphite carbon nitride nanolayers onto an Fe 2 O 3 nanoarray (BCN/Fe 2 O 3 ), followed by modification with NiCo(OH) x cocatalyst. The constructed NiCo(OH) x /BCN/Fe 2 O 3 demonstrates a significantly improved photocurrent density of 2.7 mA cm −2 at 1.23 V RHE (V versus reversible hydrogen electrode), which is 3.2 times higher than that of pristine Fe 2 O 3 . Additionally, it exhibits an extremely negative onset potential of 0.60 V RHE . Detailed studies reveal that the BCN/Fe 2 O 3 heterojunction endows a driving force for charge separation and establishes a direct pathway for their transport, while NiCo(OH) x acts as a cocatalyst to accelerate the surface water oxidation reaction.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
IEEE SENSORS JOURNAL
·
2025
·
IF 4.5
Wendi Zhu,Xuhan Wang,Wei Gao
The continuous increase in industrial exhaust emissions has led to rising atmospheric hydrogen sulfide (H2S) concentrations, posing significant threats to both environmental safety and human health. In this study, four morphologically distinct Fe2O3-based gas sensors were synthesized via different surfactantassisted hydrothermal method, among which the nanorod-structured Fe2O3 exhibited optimal sensing properties. Loading CuO into this form of iron oxide sensing material to construct p-n heterojunctions, with systematic investigation of the influence of varying CuO loading concentrations on sensor performance. Systematic investigation revealed that CuO modification significantly improved the sensor response characteristics. The optimized sensor with 15 wt% CuO loading demonstrated exceptional performance, exhibiting an ultrahigh response value of 1780 toward 100 ppm H2S at the operating temperature of 125°C, along with a rapid response time of 9 s. It provides a reasonable idea for the design of highly responsive hydrogen sulfide sensors.
研究领域:
材料科学
·
环境科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）