POWDER TECHNOLOGY
·
2018
·
IF 3.23
Qingjie Wang,Aidong Tang,Laifu Zhong,Xin Wen,Peng Yan,Jianjun Wang
The new magnetic separation adsorbent is the key material for separation something that is hard to separate. In this article, an emerging γ-Fe 2 O 3 /sepolite nanocomposite modified with 3-aminopropyltriethoxysilane was prepared by chemical coprecipitation method. The magnetic adsorbent (γ-Fe 2 O 3 /Sep-NH 2 ) was used to remove anionic dye, Congo red (CR), from aqueous solution. The γ-Fe 2 O 3 /Sep-NH 2 composite exhibited high specific saturation magnetization (95.36 emu/g) with superparamagnetism without coercivity and residual magnetism , which could be easily separated from aqueous solution by the application of an external magnetic field. Batch adsorption experimental results showed that the magnetic absorbent had high adsorption capacity of 126.4 mg/g for CR. The regeneration of the magnetic absorbent could be realized by soaking it in 0.1 mol/L NaOH solution and the recovered γ-Fe 2 O 3 /Sep-NH 2 magnetic material could be reused for CR removal. The adsorption capacity for reusing ten times still remained 90% of initial adsorption capacity. Furthermore, the adsorption capacity decreases with the increase of temperature. The adsorption processes conform to pseudo-second-order model and Langmuir isotherm model, indicating that it is a single molecule chemical adsorption process. Understanding the characteristic of magnetic adsorbent is of great importance to the development of new magnetic materials for magnetic separation removal of anionic pollutant from aqueous solution.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yaqiao Liu,Shuozhen Hu,Xinsheng Zhang,Shigang Sun
Fe 2 O 3 is a promising n -type semiconductor as the photoanode of photoelectrochemical water-splitting method due to its abundance, low cost, environment-friendly, and high chemical stability. However, the recombination of photogenerated holes and electrons leads to low solar-to-hydrogen efficiency. In this work, to overcome the recombination issue, a p-type semiconductor, CuO, is introduced underneath the γ-Fe 2 O 3 to synthesize γ-Fe 2 O 3 /CuO on the FTO substrate. Along with the formation of p-n heterojunction , CuFe 2 O 4 is in situ generated at the interface of γ-Fe 2 O 3 and CuO. The existence of Cu 2 O in CuO and CuFe 2 O 4 promotes the charge transfer from CuO to γ-Fe 2 O 3 and within CuFe 2 O 4 , respectively, resulting in creating an internal electric field in γ-Fe 2 O 3 /CuO and leading to the conduction band of CuO bending up and γ-Fe 2 O 3 bending down. Additionally, Cu(II) in CuFe 2 O 4 contributes to fast electron capture. Consequently, the charge transfer efficiency and charge separation efficiency of photo-generated holes are promoted. Hence, γ-Fe 2 O 3 /CuO exhibits an enhanced photocurrent density of 13.40 mA cm −2 (1.9 times higher than γ-Fe 2 O 3 ). The photo corrosion resistance of CuO is dramatically increased with the protection of CuFe 2 O 4 , resulting in superior high chemical stability, i.e. 85% of the initial activity remains after a long-term test.
研究领域:
材料科学
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能源科学
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半导体技术
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Xuemei Liu,Yuan Wang,Tian C. Zhang,Gang Xiang,Xinlong Wang,Shaojun Yuan
Arsenic pollution has drawn wide attention, owing to its severe carcinogenicity, strong poisonousness, and high mobility in groundwater. Herein, a magnetic heterojunction nanocomposite of TiO2/polythiophene/γ-Fe2O3 (TiO2/PTh/γ-Fe2O3) was fabricated by one-pot oxidation polymerization as a novel photocatalyst for removing trace As(III) from aqueous solution by a visible-light-driven photocatalytic oxidation–adsorption coupling process. The nanocomposite showed excellent stability to adsorb As(III) in a low-pH region (2–6). Under dark conditions, approximately 46.5% of As(III) was adsorbed by the as-synthesized nanocomposite, and the kinetic data indicated the dominating chemical adsorption. However, under visible light illumination, more than 99.1% of As(III) was transformed into As(V) and simultaneously 90.1% of produced As(V) was adsorbed by the nanocomposite. Furthermore, the photogenerated holes (h+) and superoxide free radicals (•O2–) were the main reactive substances on the TiO2/PTh/γ-Fe2O3 nanoparticle for visible-light-driven photocatalytic oxidation of As(III). The novel magnetic TiO2/PTh/γ-Fe2O3 heterojunction nanocomposite may have potential application for arsenic removal in the aquatic environment.
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
RSC Advances
·
2014
·Vol. 5
·期 7
·5164-5172
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IF 3.708
Yuhao Xiong,Fanggui Ye,Cong Zhang,Shufen Shen,Linjing Su,Shulin Zhao
A novel and inexpensive approach was adopted to develop magnetic porous γ-Fe2O3/C@HKUST-1 composites for the adsorption of dyes and heavy metal ions from aqueous solution. The γ-Fe2O3/C with unique functional groups present such as –OH and –NH2 was used as the support to directly grow HKUST-1 by a stepwise liquid-phase epitaxy process. The crystallographic, morphology, and magnetic properties as well as porosity of the as-synthesized γ-Fe2O3/C @HKUST-1 composites were carefully studied by XRD, SEM, TEM, XPS, TGA, and BET. The results indicated that the BET surface area, micropore volume, and saturation magnetization of the γ-Fe2O3/C @HKUST-1 are 993.4 m2 g−1, 0.69 cm3 g−1, and 12.6 emu g−1, respectively. In addition, a uniform distribution of ultrafine γ-Fe2O3 nanoparticles with an average diameter of 2–3 nm was observed in the γ-Fe2O3/C@HKUST-1 composites. Our results showed that methylene blue (MB) and Cr(VI) (used as a model for typical dye pollutants and heavy metal ions) are effectively removed from aqueous solutions by γ-Fe2O3/C@HKUST-1. The maximum adsorption capacities were 370.2 and 101.4 mg g−1 of adsorbent for MB and Cr(VI), respectively. Moreover, a removal efficiency of about 90% was retained after five cycles of consecutive adsorption–desorption. The adsorption kinetics data were well described by a pseudo-second-order model (R2 > 0.99), and equilibrium data were well fitted to the Langmuir isotherm model (R2 > 0.99). Finally, our results suggested that the γ-Fe2O3/C@HKUST-1 composites have a great potential to be employed for treatment of wastewater containing MB and Cr(VI).
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
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 18
·10165-10173
·
IF 3.269
Xueliang Cui,Qiaolan Zhang,Meng Tian,Zhengping Dong
Novel γ-Fe2O3-nanoparticle (NP) modified N-doped porous carbon materials (γ-Fe2O3/mCN) were prepared by one-pot pyrolysis of a mixture of melamine, polyacrylonitrile, and FeCl3·6H2O at different temperatures. At a pyrolysis temperature of 900 °C, γ-Fe2O3/mCN-900-20 exhibited a high surface area and a N content of 8.47%, caused by the complete pyrolysis of melamine and polyacrylonitrile at 900 °C. The obtained material γ-Fe2O3/mCN-900-20 was used as a cost-effective catalyst for the hydrogenation of nitrobenzene using N2H4·H2O as the reductant under mild reaction conditions. As compared to other catalysts (e.g., noble metal catalysts), γ-Fe2O3/mCN-900-20 exhibited high catalytic performance (TOF of 311.83 h−1, selectivity of 100%). During the catalytic hydrogenation of nitroaromatic compounds with reducible groups, e.g., alcoholic hydroxyl, halogen, and amino groups, an excellent selectivity close to 100% was achieved. Moreover, because the active sites of γ-Fe2O3 has magnetic performance, the catalyst can be easily recovered using a magnet, and reused at least four runs without an obvious activity decrease. Hence, the easily prepared, cost-effective and reusable γ-Fe2O3/mCN catalyst fabricated in this study demonstrates potential for applications in selective reduction of aromatic nitro compounds.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Bo Wang,Cheng Zhang,Bo Huang,Haoguang Wang,Xinrui Miao,Wenli Deng
A facile approach to prepare superhydrophobic fabric with high adhesive ability towards water droplets was developed via a simple dip-coating method. Immersing the cotton fabric (CF) into the γ-Fe 2 O 3 /epoxy resin/lauric acid (FEL) suspension for several minutes, followed by heat curing at 80 °C for 2 h, the superhydrophobic fabric (CF-FEL) was obtained. The quality ratio of γ-Fe 2 O 3 to epoxy resin effect on superhydrophobicity of°F-FEL was discussed. The water contact angle was 156° when 0.15 g γ-Fe 2 O 3 particles were applied. Based on the sticky water adhesion, the CF-FEL could be utilized to realize the transportation of water droplet without mass loss. Meanwhile, due to the capillary force and stagger fibers, the CF-FEL exhibited excellent separation flux and efficiency to separate heavy oil/water mixtures. The mechanical durability of the CF-FEL was also evaluated through tape peeling and rubbing test, which further indicated the feasibility of practical application. Moreover, the CF-FEL showed superior flame retardancy because it inherited the thermal stability property of epoxy resin and γ-Fe 2 O 3 particles. Thus, the prepared CF-FEL is multifunctional and the preparation method is facile and environmentally friendly.
研究领域:
材料科学
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环境科学
·
纺织工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2013
·Vol. 1
·期 37
·4845-4854
·
IF 0
Zhi-Gang Wang,Gong Cheng,Yan-Lin Liu,Ji-Lin Zhang,De-Hui Sun,Jia-Zuan Ni
Novel three-dimensional (3D) flowerlike hierarchical γ-Fe2O3@xNH4F·yLuF3 core–shell architectures were synthesized by a simple phase transformation route under mild conditions. The evolution of the flowerlike structure assembled by thin xNH4F·yLuF3 nanosheets has been investigated in detail. We found that an appropriate amount of NH4F and a suitable phase transformation reaction temperature are crucial for the formation of the flowerlike structure, while the calcination treatment is essential to maintain the well-defined core–shell structure. A possible formation mechanism was proposed for the phase transformation reaction and the self-assembly growth in situ. The novel composite material with large open pores, a specific surface area (26.2 m2 g−1), strong reversible magnetic response (Ms = 27.99 emu g−1), and good structural stability has been primarily applied for the selective and effective capture of phosphopeptides and it showed good performance. The obtained products may also have potential applications in areas such as water treatment, purification of biomolecules, and solid catalysis.
研究领域:
材料科学
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分析化学
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生物分离
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环境科学
✓ 已验证
产品关联
DOI
PubMed
RSC Advances
·
2015
·Vol. 5
·期 111
·91574-91580
·
IF 3.84
Xiaoliang Wang,Jawayria Mujtaba,Fang Fang,Mashkoor Ahmad,Hamidreza Arandiyan,Hongping Yang,Guoxing Sun,Hongyu Sun
Unique 1D aligned γ-Fe2O3 nanorods anchored on 2D reduced graphene oxide nanosheets were successfully synthesized by a facile seed-assisted solution reaction and subsequent thermal decomposition method. The structural and compositional analyses by employing X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) show that each γ-Fe2O3 nanorod possesses internal void spaces. The special structural nature of the γ-Fe2O3 nanorods together with the hierarchical nanoarchitectures is responsible for a large specific surface area of ∼193.6 m2 g−1. When evaluated as an anode material for LIBs, the as-prepared composite electrodes delivered superior capacity, better cycling stability and rate capability. The excellent lithium storage properties are attributed to the advantageous structural features.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanostructure in Chemistry
·
2022
·Vol. 13
·期 6
·577-589
·
IF 8
Tian Ruonan,Gao Zeyuan,Lang Ruifeng,Li Na,Gu Huilin,Chen Gang,Guan Hongtao,Comini Elisabetta,Dong Chengjun
Lately novel strategies to enhance the sensing properties on iron oxide have been proposed to achieve high performance gas sensors for acetone detection. In this working report, the synthesis of iron-glycerate (Fe-Gly) using glycerol to combine with Fe 3+ is first presented. Depending on the thermal treatment, this compound can evolve into γ-Fe 2 O 3 , α/γ-Fe 2 O 3 and α-Fe 2 O 3 . α/γ-Fe 2 O 3 shows better sensing performance as far as acetone detection is concerned. Using the dual phases of α/γ-Fe 2 O 3 as a fundamental building block, their sensing properties were further improved using Ni doping and Ru nanoparticles functionalization. The high response and selectivity to acetone detection was ascribed to the synergistic effects of unique nanosheets, mixed phases, rich oxygen vacancies and excellent catalytic activity of Ru nanoparticles. Graphical abstract
研究领域:
材料科学
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纳米技术
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传感器
·
化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 62
·57009-57012
·
IF 3.289
Di Wu,Jing Ye,Lie Chen,Yongzheng Wang,Kai Fang,Mingjiang Xie,Luming Peng,Xuefeng Guo,Weiping Ding
Crystalline mesoporous γ-Fe2O3 with a high surface area was prepared by a novel solvent-free route. This material exhibits a high reversible capacity with superior cycle performance and an exceptional high-rate capability as an anode material for Li-ion batteries.
研究领域:
材料科学
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电化学
·
纳米材料
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能源存储
·
固体化学
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电池技术
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Jianping Ding,Xiaoyan Zhou,Zhengzheng Yang,Changgeng Liu,Mingchao Sun,Congling Yang,Lu Fan
In this study, a novel strategy was proposed for synthesizing dual single-atom Ce-Ti catalysts supported on γ-Fe 2 O 3 via ball milling and calcination. Compared to γ-Fe 2 O 3 and single-atom Ce/γ-Fe 2 O 3 and Ti/γ-Fe 2 O 3 catalysts, the Ce-Ti/γ-Fe 2 O 3 catalyst exhibits superior NO conversion rates and significantly enhanced tolerance to H 2 O and SO 2 at 200–240 °C. These advancements are attributed to the synergistic interactions between Ce and Ti, which enhance redox properties, increase Lewis acid site density, and facilitate the Langmuir-Hinshelwood reaction pathway. In-situ DRIFTS and density functional theory (DFT) analyses revealed the mechanistic role of surface-active oxygen species and intermediate formation in promoting the SCR reaction. The findings provide valuable mechanistic insights and establish a scalable approach for the development of high-performance, environmentally friendly catalysts for industrial NO x removal.
研究领域:
催化化学
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环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Minghui Li,Jiayi Huang,Ruyue Deng,Yongkang Yan,Wei Zhang,Danhua Ge,Xiaojun Chen
In this study, Ce-doping Fe-based nanozymes were employed to construct a simple multichannel colorimetric sensor array for the identification and detection of quinolone antibiotics. The study demonstrates that Ce doping effectively induced a phase transformation from α-Fe 2 O 3 /Fe 7 (PO 4 ) 6 (Fe-P) to γ-Fe 2 O 3 /Fe 7 (PO 4 ) 6 composites (0.5-Ce/Fe-P) after a phosphorization treatment. This transformation led to enhanced peroxidase (POD)-like activity in 0.5-Ce/Fe-P compared to Fe-P, thanks to the excellent catalytic properties of γ-Fe 2 O 3 and the porous nature of the composites. The proposed colorimetric sensor exhibited wide linear ranges: 0.05–2.5 μM and 200–650 μM for norfloxacin (NOR), 0.05–2.5 μM and 350–750 μM for ciprofloxacin (CIP), and 0.05–2.5 μM and 300–650 μM for enrofloxacin (ENR), with the low detection limits of 0.78, 0.80 and 7.18 nM, respectively. Furthermore, the study employed principal component analysis (PCA) and hierarchical clustering analysis (HCA) to successfully distinguish between NOR, CIP and ENR, demonstrating the sensor array's ability to differentiate antibiotics. This study contributes to the food safety and environmental protection field by providing a novel tool for monitoring antibiotics in drinking water.
研究领域:
环境科学
·
食品安全
·
分析化学
✓ 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）