CHEMICAL ENGINEERING JOURNAL
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2011
·
IF 3.074
Longcheng Xu,Jiangdong Dai,Jiangming Pan,Xiuxiu Li,Pengwei Huo,Yongsheng Yan,Xiaobo Zou,Rongxian Zhang
The rattle-type γ-Fe 2 O 3 /mesoporous silica spheres (γ-Fe 2 O 3 /mSiO 2 spheres) were synthesized with a facial and selectively etching strategy. The prepared particles were characterized by FT-IR, XRD , TEM , SEM, VSM, Raman spectroscopy and nitrogen adsorption–desorption analysis, and the results indicated that γ-Fe 2 O 3 /mSiO 2 spheres exhibited magnetic property ( M s = 14.43 emu g −1 ) and composed of mesoporous silica (mean diameter, thickness and pore size was 660 nm, 60 nm, and 2.29 nm, respectively). Then the γ-Fe 2 O 3 /mSiO 2 spheres were employed as sorbents to remove tetracycline (TC) and sulfamethazine (SMZ) in both single and binary aqueous solutions. The adsorption kinetics of γ-Fe 2 O 3 /mSiO 2 spheres were well-described by the pseudo-second-order equation, initial adsorption rate, and half-adsorption time. The Langmuir isotherm model was fitted to the equilibrium data better than that for Freundlich model, and the monolayer adsorption capacity of γ-Fe 2 O 3 /mSiO 2 spheres for TC and SMZ were 0.0791 mmol g −1 and 0.0342 mmol g −1 at 298 K, respectively. In binary systems, SMZ adsorption onto γ-Fe 2 O 3 /mSiO 2 spheres was more affected by the simultaneous presence of competitive antibiotics than that for TC. In addition, the reusability of the material without obviously deterioration in performance was observed at least four repealed cycles.
研究领域:
材料科学
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环境科学
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高影响因子
JOURNAL OF CHEMICAL SCIENCES
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2020
·Vol. 132
·期 1
·1-9
·
IF 1.406
Ning Wensheng,Li Bei,Dai Hui,Hu Shiye,Yang Xiazhen,Wang Biao,Zhang Bo
Abstract The influences of sugars (sucrose, fructose and glucose) on the performance of FeAl catalysts were investigated for CO 2 hydrogenation. FeAl catalysts were prepared with two steps. At first, the catalyst precursors were obtained by co-precipitation.
During this step, three methods were used to add sucrose into the precursors. Then, promoter K and Cu were impregnated into the precursors. The improved CO 2 conversion and C 5+ hydrocarbon selectivity by sucrose addition were attributed to the formation of γ-Fe 2 O 3 phase in the catalyst precursor, which was different from the popular opinion that sucrose acted as a chelating agent. With the inspiration from sucrose hydrolysis effect, FeAl oxide, mainly in γ-Fe 2 O 3 phase was prepared by adding fructose and glucose (the products of sucrose hydrolysis) into the newly centrifuged precipitate. The formation of γ-Fe 2 O 3 phase was explained based on the results of XRD and XPS. The best catalyst possessed CO 2 conversion of 30.3% and C 5 + selectivity of 52.2% under the reaction conditions of H 2 :CO 2 = 3:1, 6.0 L/(h·g-cat), 1.6 MPa and 235 °C.
Graphic abstract
Effects of fructose and glucose on FeAl catalyst
研究领域:
化学工程
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催化科学
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
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2026
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IF 3.6
Lin Zhou,Zhanghong Guo,Haining Cui,Jinxin Ma,Chan Wang,Qijun Song
Direct transformation of biomass-derived platform compound 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) represents a highly attractive route with significant environmental and economic benefits. The nanozymes with oxidase-like (OXD-like) activity hold great promise for the green oxidation of HMF to FDCA. Herein, an iridium-coated γ-Fe 2 O 3 core-shell nanozyme (γ-Fe 2 O 3 @Ir) was prepared by the reduction of Ir 3+ with glycerol on the surface of γ-Fe 2 O 3, and the structure of the γ-Fe 2 O 3 @Ir nanozyme was confirmed by XRD, HAADF-STEM image, and elemental line-scan analyses results. The magnetic property of the nanozyme not only facilitates its recovery but also effectively enhances its affinity to oxygen. By employing γ-Fe 2 O 3 @Ir nanozyme as the catalyst and atmospheric oxygen as a green oxidant, a near-quantitative conversion (98.5%) of molar level HMF to FDCA was achieved.
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PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Sujie Shan,Wei Wang,Dongmei Liu,Zhiwei Zhao,Wenxin Shi,Fuyi Cui
Owing to the twin problems of eutrophication and global phosphorus (P) scarcity, the removal and recovery of phosphate from water and wastewater have received increasing attention. Herein, magnetically recyclable La 2 O 2 CO 3 /γ-Fe 2 O 3 adsorbents were rationally designed by derivation from La/Fe binary metal organic framework (MOF) precursors via calcination treatment. Based upon preliminary screening of as-prepared La 2 O 2 CO 3 /γ-Fe 2 O 3 nanocomposites with different La-to-Fe molar ratios in terms of phosphate sorption capacity and magnetic property as well as La content, La 2 O 2 CO 3 /γ-Fe 2 O 3 nanocomposite with a La-to-Fe molar ratio of 2:1 was selected for further characterization and adsorption performance evaluation. Batch adsorption experiments showed that La 2 O 2 CO 3 /γ-Fe 2 O 3 (2:1) adsorbent exhibited a remarkable phosphate sorption capacity of 134.82 mg P/g, a fast sorption kinetic, strong selectivity for phosphate in the presence of co-existing anions, and a wide applicable pH range of 3−9. Furthermore, La 2 O 2 CO 3 /γ-Fe 2 O 3 (2:1) sorbent displayed an excellent sorption performance for low-concentration wastewater, a low dosage of 0.1 g/L was sufficiently enough for reducing P-concentration from 0.5 mg P/L to below 10 μg P/L within 20 min. In a real sewage of 2.68 mg P/L, 0.2 g/L of sorbent could reduce the concentration of phosphate to <0.01 mg P/L within 50 min. Moreover, over 83.1 % of original sorption capacity could be retained after 5 consecutive regeneration cycles, showing great regenerative performance of the adsorbent. These development is expected to be meaningful for practical water purification.
研究领域:
环境科学
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材料科学
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Zhen Xiang,Baiwen Deng,Chuang Huang,Zhicheng Liu,Yiming Song,Wei Lu
High-performance electromagnetic wave (EMW) absorbing materials have been widely used in the wireless communication and electronic devices due to their important potentials in electromagnetic attenuation. However, it is difficult to develop carbon-based absorbers with thin thickness, lightweight, and low filler loading. In this work, rationally designed hollow nanosphere γ -Fe 2 O 3 /MWCNTs composites were successfully realized for ultrathin, lightweight, and high-efficiency EMW absorbers. It showed that the composition, microstructure, and morphology of composites were tailored, which gave rise to the tunable magnetic behavior, porosity, and electromagnetic parameters. The rational design of composition and novel structure contributed to the optimization of the impedance match. The EMW attenuation was enhanced by the synergistic effects of the dielectric loss originated from the interfacial and dipole polarization, conductive loss stemmed from the 3D conductive network, and the magnetic loss derived from the eddy-current loss and ferromagnetic resonance. Accordingly, the hollow nanosphere γ -Fe 2 O 3 /MWCNTs composites with a low filling ratio of 20 wt% achieved an ultrathin matching thickness of 1.4 mm and a strong reflection loss of −63.6 dB. The substantially enhanced EMW absorbing performances were owing to the optimized impedance matching and enhanced attenuation capability. Therefore, this work can provide a paradigm for the design and synthesis of hollow nanosphere γ -Fe 2 O 3 /MWCNTs composites with an enhanced EMW absorption.
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Food Analytical Methods
·
2026
·Vol. 19
·期 10
·303
·
IF 3
Tu Xiaodong,Yao Mingcai,Dong Liang
A chloramphenicol (CAP) electrochemical sensor based on zinc tungstate and maghemite nanocomposites (ZnWO 4 /γ-Fe 2 O 3 ) is proposed. First, ZnWO 4 and γ-Fe 2 O 3 nanomaterials were synthesized using a hydrothermal synthesis method, then compositely modified onto glassy carbon electrodes to construct electrochemical sensors for measuring CAP. Under optimal conditions, the ZnWO 4 /γ-Fe 2 O 3 -modified electrode exhibits a stronger reduction peak current for CAP detection than the single-component electrode and demonstrates better electrocatalytic activity. The results demonstrate that ZnWO 4 /γ-Fe 2 O 3 /GCE exhibits a linear detection range of 8–1000 μM and a detection limit of 1.04 μM, demonstrating good selectivity in the presence of different interferers, as well as outstanding stability and reproducibility. ZnWO 4 /γ-Fe 2 O 3 /GCE was used to detect of CAP in milk samples, yielding satisfactory results.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Wenfang Miao,Shaopeng Li,Xingru Cao,Enmin Lv,Hongtao Yu,Xuefeng Zhang,Xinglong Dong
The sluggish kinetics of oxygen reduction reaction at the cathode is one of the obstacles of the next-generation energy conversion system such as fuel cell and Zn-air battery. Here, a simple pyrolysis method was used to transform delignification-treated balsa wood into nitrogen-doped porous layered carbon materials. γ-Fe 2 O 3 nanocrystals were supported on N-doped wood-derived carbon materials. The prepared Fe 2 O 3 -CW 1000 catalyst exhibits superior ORR performance with a high onset potential of 0.98 V RHE in alkaline environment. This is consistent with the potential of commercial Pt/C. The superior ORR activity is attributed to the fact that γ-Fe 2 O 3 nanoparticles promote the activity of Fe-N x sites. And the N-enriched porous carbon matrix facilitates the faster electron movement on the catalyst surface and the full exposure of the active sites.
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高影响因子
Crystals
·
2023
·Vol. 13
·期 5
·810
·
IF 2.7
Ruonan Tian,Huai Tan,Gang Chen,Hongtao Guan,Chengjun Dong,Zongyou Yin
Although individual γ-Fe2O3and α-Fe2O3have been widely fabricated for gas sensors, their mixed phase of α/γ-Fe2O3might deliver excellent sensing properties. In this study, a facile solvothermal method was used to fabricate Fe-alkoxide. After thermal treatment, it was converted into γ-Fe2O3, α-Fe2O3and their mixed-phase α/γ-Fe2O3with a nanosheets-assembled flower-like structure. We studied the influence of calcination temperature on the phase and sensing properties on acetone detection. The α/γ-Fe2O3which annealed at 400 °C included 18% α-Fe2O3and it exhibited excellent sensing performance towards acetone compared to that of γ-Fe2O3and α-Fe2O3. It showed a response of 353 to acetone with a concentration of 200 ppm, and a low limit of detection of 0.5 ppm at 160 °C. In addition, the change in responses with acetone concentration from 50 to 200 ppm shows a good linear relationship. Moreover, this material has good reproducibility and selectivity as well as a fast response time of 22 s and recovery time of 14 s to 200 ppm. Therefore, our mixed phase of α/γ-Fe2O3possesses great prospects for acetone detection.Keywords:Fe2O3;phase;gas sensor;acetone;sensing performance
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高影响因子
Russian Journal of Physical Chemistry A
·
2019
·Vol. 93
·期 7
·1343-1348
·
IF 0.581
Liang An,Zhao Xiaolian,Xu Chengkang,Yan Zhaoxiong,Yang Zhihua,Xu Zhihua
Abstract In this work, magnetically separable and recyclable γ-Fe 2 O 3 /HAp/Ag 3 PO 4 composite microsheets were prepared by hydrothermal and in-situ ion-exchange methods, in which photoactive Ag 3 PO 4 nanoparticles and magnetic γ-Fe 2 O 3 nanoparticles are distributed on the hydroxyapatite (HAp) microsheets. Characterization of the samples was performed by XRD, FE-SEM, EDS, FT-IR, and VSM. The photocatalytic performance of the samples was checked by investigating the degradation process of four different organic dyes under visible-light irradiation. Photocatalytic experiments reveal that all γ-Fe 2 O 3 /HAp/Ag 3 PO 4 samples show certain photocatalytic activities for the degradation of OII, and the degradation rate is different when diverse γ-Fe 2 O 3 /HAp/Ag 3 PO 4 samples are added into the OII solution. FHA-4 exhibits the highest degradation rate, and it could degrade different organic dyes, which means it has the potential to be applied into the treatment of complex wastewater containing different organic dyes. In addition, FHA-4 exhibits ferromagnetic feature, and can be easily separated from water by an external magnetic field.
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DESALINATION
·
2024
·
IF 8.3
Bing Zhang,Xin Mao,Tengfei Ma,Bing Zhang,Xiaohong Li,Bin Liu,Oliver Terna Iorhemen,Wenxin Shi
Fe 3 O 4 , γ-Fe 2 O 3 , and α-Fe 2 O 3 nanoparticles play a crucial role in influencing the adsorption capacity and pretreatment efficacy as iron-based nano-metal oxides due to their distinct structural and physicochemical properties. However, the impact of these adsorbents on membrane filtration efficiency remains unexplored. This study aimed to investigate the influence of these three adsorbents on membrane fouling in an aerobic granular sludge–membrane system (AGSMS) used for municipal wastewater reuse treatment. The results demonstrated that under optimal conditions, γ-Fe 2 O 3 exhibited superior effectiveness in removing low and medium molecular weight contaminants from wastewater, resulting in a higher normalized flux (0.59) and reduced total fouling resistance (2.66 × 10 11 m −1 ). It also showed the highest removal rate for organic matter and suspended solids, making it particularly effective in mitigating AGSMS membrane fouling. However, excessive addition (2 g/L) of Fe 3 O 4 , γ-Fe 2 O 3 , and α-Fe 2 O 3 could potentially hinder the proper operation of the AGSMS. Pre-adsorption facilitated the formation of a porous cake layer while inhibiting standard blocking behavior. Additionally, the extended Derjaguin–Landau–Verwey–Overbeek theory analysis revealed a substantial energy barrier between membrane-foulant interactions (125.65 kT) as well as foulant-foulant interactions (62.06 kT) within the γ-Fe 2 O 3 system, confirming its exceptional antifouling characteristics. This study offers valuable insights into the selection of iron oxide adsorbents for membrane fouling mitigation and wastewater reuse.
研究领域:
环境工程
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污水处理
·
材料科学
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DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2013
·Vol. 66
·期 3
·512-517
·
IF 1.66
Cui Hongtao,Wang Minmin,Ren Wanzhong,Liu Yan,Zhao Yunan
Silica monoliths embedded with high concentration of γ-Fe 2 O 3 or TiO 2 nanoparticles were prepared by a sol–gel procedure designed according to the inherent properties of oxide colloids. In the first step, highly dispersible oxide nanoparticles were produced using an in situ modification sol–gel strategy. Then, these particles were re-dispersed in silicon alkoxide-containing solution to form a stable colloidal solution. The hydrolysis and condensation reactions of alkoxide were catalyzed by an organic base (morpholine). Due to the large molecule size of morpholine, the electric double layer on the surface of colloidal particles was not compressed by the ionized morpholine molecules. The colloidal solution thus remained stable during the gelation process. Through this procedure, oxide nanoparticles could be immobilized homogeneously in the pores of a silica matrix, forming highly transparent and crack-free monoliths.
研究领域:
材料科学
·
化学工程
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高影响因子
MATERIALS LETTERS
·
2018
·
IF 2.687
Keke Sun,Chen Xu,Tianke Hu,Caixue Lin,Yifeng Wang,Yulin Li,Ling Li,Yingxi Wang
In this work, novel core-shell γ-Fe 2 O 3 /La-MOFs@SiO 2 nanoparticles were fabricated and characterized. The feasibility for multifunctional drug carrier was investigated. The cytotoxicity proved the high biocompatibility and the drug release experiments showed the excellent pH-responsive release. The magnetic nature and strong blue fluorescence indicated the potential use for magnetic target and magnetic resonance/fluorescence dual mode imaging.
研究领域:
纳米医学
·
材料科学
·
药物递送
·
生物成像
·
分子成像
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DOI
高影响因子
危险品化学品经营许可证（带存储）