APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2012
·Vol. 108
·期 4
·961-965
·
IF 1.63
Shao Hao,Zhang Xuebin,Chen Fanyan,Liu Shasha,Ji Yi,Zhu Yajun,Feng Yi
In this paper, smooth α -Fe 2 O 3 nanotubes have been successfully synthesized by electrospinning of ferric nitrate–polyvinyl alcohol solution followed by calcination in air. The morphologies and structures of the samples were characterized by transmission electron microscopy, scanning electron microscopy and X-ray diffraction. The catalytic properties were studied by differential thermal analysis and thermogravimetric analysis. The results indicated that the as-prepared α -Fe 2 O 3 nanotubes showed a continuous morphology and an extremely high degree of crystallization. The average inner and outer diameters of the obtained α -Fe 2 O 3 nanotubes were about 60 nm and 100 nm, respectively. The obtained α -Fe 2 O 3 nanotubes were able to lower the temperature of the high-temperature thermal decomposition of ammonium perchlorate, while they had little effect on the crystallographic phase transformation and the low-temperature thermal decomposition.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Cheng Tan,Lei Li,Kongzhai Li,Dapeng Zhong
A novel method to separate As from high As-Sb dust using Fe 2 O 3 as a fixative under an O 2 -N 2 atmosphere is proposed. Here, Sb is oxidised and converted to Sb 2 O 4 and FeSbO 4 that remain in the roasted residue, and As is volatilized in the form of As 4 O 6 . The Sb 2 O 3 can be selectively oxidised from the dust by using 21 vol% O 2 , but the formation of amorphous substance (As-Sb-O) hinders the effective separation of As and Sb. Adding Fe 2 O 3 hinders the amorphous substance formation and destroys the structure of the solid solution ((Sb, As) 2 O 3 ) in the raw material by converting the Sb component in it to FeSbO 4 . Therefore, the volatilization rates of As and Sb can reach up to 90.53% and only 13.20%, respectively at a roasting temperature of 723 K, roasting time of 90 min, an Fe 2 O 3 dosage of 15 mass%, and O 2 content of 21 vol%.
研究领域:
冶金学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2011
·
IF 3.65
Ying Liu,Yu-Xiang Yu,Wei-De Zhang
Ni-doped Fe 2 O 3 thin films which were active photoanodes for water splitting were prepared by electrodeposition. By adjusting Ni molar ratios (Ni/(Ni + Fe)) in the electrolyte, Fe 2 O 3 thin films with various compositions of Ni could be tuned. The films were characterized by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, atomic absorption spectrophotometer, and UV–vis spectroscopy. The highest photo-response obtained from Fe 2 O 3 doped with 2.08 mol.% Ni is 1.5 mA/cm 2 at 0.65 V vs. Ag/AgCl in 1.0 M NaOH solution. The high performance is attributed to the improvement of charge transport properties and retardation of the charge recombination resulting from the dopants in the lattice. The optical absorption spectra of the films reveal that the bandgaps of the Ni-doped Fe 2 O 3 films are approximately 1.9–2.2 eV for all samples regardless of their doping level. XPS shows that the concentration of Ni is much higher on the surface than that in bulk.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Semiconductors
·
2016
·Vol. 37
·期 1
·013005
·
IF 0
Li Liu,Shouchun Li,Xin Guo,Yue He,Lianyuan Wang
In2O3–Fe2O3 nanotubes are synthesized by an electrospinning method. The as-synthesized materials are characterized by scanning electron microscope and X-ray powder diffraction. The gas sensing results show that In2O3–Fe2O3 nanotubes exhibit excellent sensing properties to acetone and formaldehyde at different operating temperatures. The responses of gas sensors based on In2O3–Fe2O3 nanotubes to 100 ppm acetone and 100 ppm formaldehyde are 25 (240 °C) and 15 (260 °C), and the response/recovery times are 3/7 s and 4/7 s, respectively. The responses of In2O3–Fe2O3 nanotubes to 1 ppm acetone (240 °C) and formaldehyde (260 °C) are 3.5 and 1.8, respectively. Moreover, the gas sensor based on In2O3–Fe2O3 nanotubes also possesses an excellent selectivity to acetone and formaldehyde.
研究领域:
材料科学
·
传感技术
✓ 已验证
DOI
RSC Advances
·
2014
·Vol. 4
·期 18
·9314-9320
·
IF 3.708
Xiangui Ding,Liu Bao,Jiang Jiang,Hongwei Gu
A facile method of synthesizing γ-Fe2O3 ultrathin nanoplates has been developed. These nanoplates are single crystalline and superparamagnetic at room temperature, with a thickness of only 1.4 nm. FTIR analysis has shown that the coordination mode between Fe and carboxyl group is dominated by bidentate configuration in the as prepared iron oleate complex, which is the key for producing the nanoplate morphology. By changing the reaction temperatures, the lateral size and thickness of nanoplates can be varied.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2023
·Vol. 129
·期 8
·1-8
·
IF 2.7
Cui Hongshan,Hu Lifang,Zhu Jichao,Wang Liping,He Jie
Ethyl mercaptan is a typical volatile pollutant with strong irritating odor and very low olfactory threshold. A small amount of exhaust emissions will cause a very bad impact on the surrounding environment and human health. A novel Fe 2 O 3 -loaded ZnTi-layered double hydroxide (Fe 2 O 3 –ZnTi-LDH) photocatalytic material was prepared by hydrothermal method. The physical and chemical properties of Fe 2 O 3 –ZnTi-LDH and its corresponding precursors were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared (ATR, FT-IR), X-ray photoelectron spectroscopy (XPS), and N 2 adsorption–desorption measurements, Ultraviolet–visible diffuse reflection spectrum (UV–vis DRS), and Mott–Schottky (MS) method. The photocatalytic performance of the material is evaluated under a static condition. The results show that the uniform distribution of Fe 2 O 3 on ZnTi-LDH improves the photocatalytic efficiency of the Fe 2 O 3 –ZnTi-LDH. At the same time, the interaction between the Fe 2 O 3 and the ZnTi-LDHs further enhances the catalytic stability of the Fe 2 O 3 –ZnTi-LDH. The results also show a significant synergistic effect between Fe 2 O 3 and ZnTi-LDH. Fe 2 O 3 –ZnTi-LDH provides a new catalyst structure for photocatalytic conversion of ethyl mercaptan and a new research idea for the treatment of ethyl mercaptan.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Qingyong Tian,Wei Wu,Lingling Sun,Shuanglei Yang,Mei Lei,Juan Zhou,Ying Liu,Xiangheng Xiao,Feng Ren,Changzhong Jiang,Vellaisamy A. L. Roy
Heterogeneous photocatalysis is of great interest for environmental remediation applications. However, fast recombination of photogenerated electron–hole pair and a low utilization rate of sunlight hinder the commercialization of currently available semiconductor photocatalysts. In this regard, we developed a unique ternary single core-double shell heterostructure that consists of α-Fe2O3@SnO2@Cu2O. This heterostructure exhibits a tube-like morphology possessing broad spectral response for the sunlight due to the combination of narrow bandgap and wide bandgap semiconductors forming a p–n heterojunction. To fabricate such a short nanotube (SNT), we used an anion-assisted hydrothermal route for deposition of α-Fe2O3, a seed-mediated deposition strategy for SnO2, and finally an aging process to deposit a Cu2O layer to complete the tube-like ternary α-Fe2O3@SnO2@Cu2O single core-double shell heterostructures. The morphology, composition, and photocatalytic properties of those ternary core–shell–shell heterostructures were characterized by various analytical techniques. These ternary heterostructures exhibited enhanced photocatalytic properties on the photodegradation of the organic dye of Rhodamine B (RhB) under simulated sunlight irradiation. The origin of enhanced photocatalytic activity is due to the synergistic effect of broad spectral response by combining narrow bandgap and wide bandgap semiconductors and, hence, an efficient charge separation of photogenerated electron–hole pairs facilitated through the p–n heterojunction. Furthermore, our unique structure provides an insight on the fabrication and controlled preparation of multilayer heterostructural photocatalysts that have intriguing properties.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2016
·Vol. 80
·期 3
·719-727
·
IF 1.473
Sun Shanfu,Sun Mingxuan,Kong Yuanyuan,Fang Yalin,Yao Yuan
Abstract There has been considerable progress in the field of semiconductor photocatalysis; nevertheless, developing low-cost and high-activity photocatalysts are still a challenge at the present. Here, a series of graphene/MoS 2 /Fe 2 O 3 ternary composites (MG/Fe 2 O 3 ) were prepared via a two-step simple hydrothermal process using H 2 MoO 4 , CH 4 N 2 S, graphene oxide, and Fe(NO 3 ) 3 ·9H 2 O as the starting materials, respectively. Various techniques such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, photoluminescence spectra, and UV–Vis diffuse reflectance spectroscopy were adopted to characterize the as-prepared samples. The results suggested that MoS 2 /graphene hybrids were successfully composited with Fe 2 O 3 . A redshift of absorption edge in the light region and more absorption in the visible light region were confirmed for the prepared ternary composites. The highest photocatalytic activity of MG/Fe 2 O 3 composites (3.01 × 10 −3 min −1 ) was observed, which was 1.5 times higher than that of pure Fe 2 O 3 (1.97 × 10 −3 min −1 ). The effect of ultrasound on photocatalytic reactions was investigated, and its photodegradation rate was improved 2.2 times than the photoreactor system without sonication. The results indicated that the positive synergetic effect of the MoS 2 and graphene components in this hybrid cocatalyst, which extended the light response and acted as a charges transfer medium, respectively, is the key to improve photocatalytic performance of Fe 2 O 3 . This research may provide new concepts for the design of high-efficiency photocatalysts and broaden the potential of application of Fe 2 O 3 in photocatalytic fields. Graphical Abstract MoS 2 /graphene/Fe 2 O 3 nanocomposites were successfully fabricated via a simple two-step hydrothermal process and a considerably enhanced activity of visible light-induced photodecomposition of MB was demonstrated.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Bingrong Li,Yaowu Wei,Conghua Peng,Hui Zhou,Shuai Li,Shizhen Wang
The influence of Fe 2 O 3 on the hydration kinetics of tricalcium aluminate (C 3 A) was studied in order to clarify the mechanism of improving hydration resistance of CaO by in-situ synthesized tricalcium aluminate. The Krstulovic-Dabic model was used to investigate the hydration processes of Fe 2 O 3 -C 3 A solid solution and calculate the corresponding kinetic parameters. The hydration products were analyzed by the X-ray diffraction and scanning electron microscope. The results indicated that the Krstulovic-Dabic model simulated the hydration processes of Fe 2 O 3 -C 3 A solid solution at different stages effectively. The hydraulic activity of Fe 2 O 3 -C 3 A solid solution decreased with the addition of Fe 2 O 3 . Reasonable amount of Fe 2 O 3 addition reduced the hydration rate in the initial stage of Fe 2 O 3 -C 3 A solid solution hydration, while the hydration rate of Fe 2 O 3 -C 3 A solid solution was increased with excessive amount Fe 2 O 3 . The hydration process was controlled by multiple mechanisms due to an incomplete layer of hydration products was formed on the surface.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Chinese Physics B
·
2015
·Vol. 24
·期 11
·118501
·
IF 1.603
Chang-Bai Liu,Ying He,Sheng-Lei Wang
In this work, pure α-Fe2O3 and Er2O3-Fe2O3 nanotubes were synthesized by a simple single-capillary electrospinning technology followed by calcination treatment. The morphologies and crystal structures of the as-prepared samples were characterized by scanning electron microscopy and x-ray diffraction, respectively. The gas-sensing properties of the as-prepared samples have been researched, and the result shows that the Er2O3-Fe2O3 nanotubes exhibit much better sensitivity to ethanol. The response value of Er2O3-Fe2O3 nanotubes to 10 ppm ethanol is 21 at the operating temperature 240°, which is 14 times larger than that of pure α-Fe2O3 nanotubes (response value is 1.5). The ethanol sensing properties of α-Fe2O3 nanotubes are remarkably enhanced by doping Er, and the lowest detection limit of Er2O3-Fe2O3 nanotubes is 300 ppb, to which the response value is about 2. The response and recovery times are about 4 s and 70 s to 10 ppm ethanol, respectively. In addition, the Er2O3-Fe2O3 nanotubes possess good selectivity and long-term stability.
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
·
2014
·
IF 2.538
Chang Su,Changbai Liu,Li Liu,Mucui Ni,Haiying Li,Xiaoqing Bo,Lili Liu,Xiao Chi
Pure and 3 wt% Sm-doped α-Fe 2 O 3 nanotubes are prepared via a typical electrospinning technology and calcination procedure. The characteristic and morphology of the synthesized nanotubes are investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM). Compared with pure α-Fe 2 O 3 nanotubes, 3 wt% Sm-doped α-Fe 2 O 3 nanotubes display enhanced gas-sensing properties. The response of 3 wt% Sm-doped α-Fe 2 O 3 nanotubes is 33–50 ppm acetone, which is 13 times larger than that of pure α-Fe 2 O 3 nanotubes. The lowest detection limit of acetone is 500 ppb to which the response is 2.3 at the optimum operating temperature of 240 °C. The response and recovery times are about 6 and 11 s to 50 ppm acetone, respectively. In addition, 3 wt% Sm-doped α-Fe 2 O 3 nanotubes exhibit good selectivity and long term stability.
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
ACS Applied Materials & Interfaces
·
2013
·
IF 5.008
Hao Shan,Changbai Liu,Li Liu,Jinbao Zhang,Haiying Li,Zhen Liu,Xiaobo Zhang,Xiaoqing Bo,Xiao Chi
SnO2–Fe2O3 interconnected nanotubes were obtained by combining the single nozzle electrospinning and thermal treatment methods. The results of scanning electron microscopy revealed the special structure of ruptures and interconnected nanotubes in the as-prepared materials. The toluene sensing test results of SnO2–Fe2O3 interconnected nanotubes show that SnO2–Fe2O3 interconnected nanotubes possess excellent toluene gas-sensing properties. The sensitivity of detecting limit (50 ppb) is 2.0 at the optimum operating temperature of 260 °C. The response and recovery times to 1 ppm toluene are about 5 and 11 s, respectively. Moreover, the SnO2–Fe2O3 interconnected nanotube gas sensors exhibit the remarkable selectivity to toluene, and good long-term stability.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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