CHEMICAL ENGINEERING JOURNAL
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2013
·
IF 3.473
Fei Ji,Chaolin Li,Xiyu Wei,Jie Yu
Porous Fe 2 O 3 particle was synthesized by the hydrothermal-calcination method and then used to activate peroxymonosulfate (PMS) for Rhodamine B (RhB) decolorization. Several analytical means such as X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and N 2 physisorption were used to determine the characteristics of the catalyst particles. The results of experiments indicated that the catalyst showed a high activity in decolorization of RhB in the presence of PMS. Several key parameters including initial pH, amounts of catalyst, PMS concentration, and temperature were investigated in order to understand their effect on the decolorization efficiency. Furthermore, the catalyst showed good reusability and stability after three recycles. Finally, the free radicals participating in the process were classified by radical quenching studies, and a rational mechanism was proposed based on the results obtained to understand the catalytic process.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
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2017
·
IF 2.446
Yan Sun,Xiaohan Liu,Fangzhi Huang,Shikuo Li,Yuhua Shen,Anjian Xie
A low-cost and green method to get electrode materials with wonderful electrochemical performance is decisive for the development of lithium ion batteries (LIBs). Here it’s the first time to synthesize rod-like porous Fe 2 O 3 coated with carbon (Fe 2 O 3 /C) by using biomolecules in spinach juice as soft templates and carbon resource. The different initial concentrations of Fe 3+ can affect the morphologies and electrochemical properties of samples. When the initial concentration of Fe 3+ is 0.4 M, the sample (Fe 2 O 3 /C-2) exhibits favorable performance of lithium storage owing to the existence of carbon with excellent electroconductivity and the porous rode-like structure which can relieve the large volume change and provide pathway for Li + transport during cycles. The initial capacity of sample is 1405 mA h g −1 while the capacity maintained 581 mA h g −1 after 100 cycles at a current density of 0.2 A g −1 . The excellent electrochemical performances of Fe 2 O 3 /C-2 make it a promising anode material for LIBs.
研究领域:
材料科学
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能源科学
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绿色化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 9
·1701
·
IF 4.324
Ruowen Liang,Zhoujun He,Chen Zhou,Guiyang Yan,Ling Wu
In this work, CdS quantum dots (QDs) were planted on magnetically recyclable porous Fe2O3(denoted as F450) to obtain CdS QDs/porous Fe2O3hybrids (denoted as X–CdS/F450, in which X is the immersion times of CdS QDs). Porous Fe2O3was first obtained by pyrolysis from an iron-containing metal–organic framework by a two-step calcination method. Next, CdS QDs (of average size 3.0 nm) were uniformly and closely attached to the porous F450 via a sequential chemical-bath deposition strategy. As expected, the X–CdS/F450 hybrids serve as high-performance photocatalysts for the degradation of bisphenol A, a typical endocrine-disrupting chemical. Almost ∼100% of the bisphenol A was degraded over 5-CdS/F450 after visible light irradiation for 30 min (λ ≥ 420 nm). In comparison, the degradation efficiency of pure F450 powder is 59.2%. The high performance of 5-CdS/F450 may be ascribable to the fast electron transport of porous F450, the intense visible-light absorption of the CdS QDs and the matched energy levels between CdS and F450. More significantly, through the photocatalytic degradation reaction, the X–CdS/F450 hybrids can easily be recovered magnetically and reused in subsequent cycles, indicating their stability and recyclability.Keywords:MIL-100(Fe);self-sacrificed template;bisphenol A;photocatalyst;mechanism
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
ACS Nano
·
2017
·
IF 13.942
Tiancai Jiang,Fanxing Bu,Xiaoxiang Feng,Imran Shakir,Guolin Hao,Yuxi Xu
Integrating nanoscale porous metal oxides into three-dimensional graphene (3DG) with encapsulated structure is a promising route but remains challenging to develop high-performance electrodes for lithium-ion battery. Herein, we design 3DG/metal organic framework composite by an excessive metal-ion-induced combination and spatially confined Ostwald ripening strategy, which can be transformed into 3DG/Fe2O3 aerogel with porous Fe2O3 nanoframeworks well encapsulated within graphene. The hierarchical structure offers highly interpenetrated porous conductive network and intimate contact between graphene and porous Fe2O3 as well as abundant stress buffer nanospace for effective charge transport and robust structural stability during electrochemical processes. The obtained free-standing 3DG/Fe2O3 aerogel was directly used as highly flexible anode upon mechanical pressing for lithium-ion battery and showed an ultrahigh capacity of 1129 mAh/g at 0.2 A/g after 130 cycles and outstanding cycling stability with a capacity retention of 98% after 1200 cycles at 5 A/g, which is the best results that have been reported so far. This study offers a promising route to greatly enhance the electrochemical properties of metal oxides and provides suggestive insights for developing high-performance electrode materials for electrochemical energy storage.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Yanfei Li,Yuanyuan Fu,Shouhui Chen,Zhenzhong Huang,Li Wang,Yonghai Song
A rapid and simple way to prepare porous Fe 2 O 3 /Fe 3 O 4 @carbon octahedron arrayed on three-dimensional graphene foam (Fe 2 O 3 /Fe 3 O 4 @C/G) nanocomposites was developed. Firstly, Fe-metal organic frameworks (MOFs)/graphene oxide (GO) precursor was fabricated by growing octahedral Fe-MOFs on the surface of GO and then the as-prepared Fe-MOFs/GO was rapidly transformed into porous Fe 2 O 3 /Fe 3 O 4 @C/G by combusting the mixture of precursors and triethylamine (TEA) in air. In the combustion process, GO was reduced and connected each other into N-doped G foam, and Fe-MOFs were transformed into porous Fe 2 O 3 /Fe 3 O 4 @C octahedron and arrayed on G foam. The porous structure, porous carbon and G foam relieved the volume expansion of Fe 2 O 3 /Fe 3 O 4 nanoparticles , and enhanced electrical conductivity of nanocomposites. The as-prepared Fe 2 O 3 /Fe 3 O 4 @C/G showed a high discharge capacity (1210 mAh g −1 , 200 cycles) and long cycle life (5 A g −1 , 400 cycles) when was applied to lithium-ion batteries. This work to prepare Fe 2 O 3 /Fe 3 O 4 @C/G nanocomposites through the combustion of TEA and Fe-MOFs/GO could save energy, achieve rapid preparation and shorten the reaction time. It might provide an original way for fabrication of transition metal oxides@C derived from MOFs and a constructive view into the preparation of composite materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 36
·11167-11176
·
IF 6.641
Lei Wang,Jie Zhang,Min Wang,Renchao Che
Benefiting from the assistance of an organic ligand, porous Fe2O3 microspheres tightly wrapped by reduced graphene oxides (Fe2O3@RGO) were synthesized via a facile one-step hydrothermal method. The assembled Fe2O3 microspheres with different morphologies and sizes can be effectively regulated by controlling the addition of the iron source. The as-synthesized Fe2O3 spheres gradually changed from solid, hollow to a final solid ball with decreasing sizes from 800 nm to 200 nm. Intrinsic dielectric properties and charge density distribution were characterized by vector network analysis (VNA) and off-axis electron holography. Owing to their unique structure design, better electron transport behavior and enhanced dielectric and interfacial polarization, RGO wrapped hollow Fe2O3 microspheres exhibit the best electromagnetic energy conversion ability. The maximum reflection loss can reach −48.1 dB and the effective absorption bandwidth cover is 5.28 GHz (10.48–15.76 GHz) at 2.5 mm. Tuning the thickness from 1 to 5 nm, the strongest reflection loss peaks can shift from high to low frequency, showing adjusting absorption properties.
研究领域:
材料科学
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纳米技术
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电磁材料
✓ 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）