JOURNAL OF MOLECULAR LIQUIDS
·
2016
·
IF 2.74
Ying Zhang,Lizhen Bai,Wenfeng Zhou,Runhua Lu,Haixiang Gao,Sanbing Zhang
Fe 3 O 4 @nSiO 2 @mSiO 2 was prepared successfully and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), infrared spectrometer (FT-IR), BET surface area measurements and Zeta potential analysis techniques. The contact time, initial concentration of congo red, temperature and pH on adsorption capacity were studied. The adsorbent shows highly efficient adsorption properties, with maximum adsorption capacity of 1428 mg g − 1 for congo red, which is much higher than the other adsorbents (normally below 300 mg g − 1 ). The adsorption kinetics and isotherm of congo red on Fe 3 O 4 @nSiO 2 @mSiO 2 were systematically investigated and found that the adsorption kinetics and isotherm were well fitted by pseudo-second-order kinetic and Langmuir isotherm model.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Chengzhen Wei,Zhaojiang Yu,Zhencai Guo,Nan Guan,Wen Xing,Weimin Du,Lin Liu,Yongming Zhang,Cheng Cheng
Yolk-shelled hollow structures with unique structural features are incredibly attractive for energy storage systems . Here we present a self-template strategy to prepare carbon coated yolk-shelled Fe 3 O 4 -CeO 2 hollow spheres. First, yolk-shelled Fe-Ce glycerate precursors are designed by a solvothermal method. Afterward, the carbon coated yolk-shelled Fe 3 O 4 -CeO 2 hollow spheres are eventually synthesized via calcinations the obtained precursors in Ar. Such unique structures endow the Fe 3 O 4 -CeO 2 with abundant inner cavities, large surface area and more electroactive site. As electrode material for supercapacitors , a large capacity of 430 C g −1 is obtained at 2.0 A g −1 , and it can be as high as 198.4 C g −1 even at 20 A g −1 . Moreover, it also takes outstanding rate capability and superior cycling durability (only 5.2 % capacity reduction over 5000 cycles at 6.0 A g −1 ). Furthermore, a quasi-solid-state flexible asymmetric supercapacitor device is constructed by Fe 3 O 4 -CeO 2 cathode and activated carbon anode . The device manifests a high energy density of 46.6 Wh kg −1 at 2.0 A g −1 ( versus 1650 W kg −1 power density). Even at 15 A g −1 , the energy density is still 21 Wh kg −1 with 12,441 W kg −1 . We envision that this work not only explores a promising electrode material for supercapacitors, but also provides an alternative avenue to prepare yolk-shelled hollow structures toward energy storage applications .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2021
·
IF 3.739
Lei He,Lei Wang,Haomiao Zhu,Zhe Wang,Luxia Zhang,Lutao Yang,Yong Dai,Hong Mo,Jun Zhang,Jian Shen
Oilfield wastewater contains a large number of metal ions (such as Ca 2+ and Cu 2+ ). Reinjection in oil wells without treatment would affect oil recovery. To remove Ca 2+ and Cu 2+ ions, we prepared a reusable Fe 3 O 4 /GO-COOH nanoadsorbent by the magnetization and carboxylation of graphene oxide (GO). The Ca 2+ and Cu 2+ removal percents of the nanoadsorbent reached 78.4% and 51% at 60 min, respectively. After five adsorption/desorption cycles, the nanoadsorbent retained high recovery rates (82.1% for Ca 2+ and 91.8% for Cu 2+ ) and removal percents (72.3% for Ca 2+ and 49.33% for Cu 2+ ). In the simulated indoor oil recovery test, oilfield wastewater treated with Fe 3 O 4 /GO-COOH could enhance oil recovery (EOR) by 11.0% compared with untreated oilfield wastewater. The novel magnetic nanoadsorbent could not only adsorb metal ions in oilfield wastewater effectively to enhance oil recovery (EOR) but could also be quickly recycled and reused, which shows promising application prospects in oil exploitation.
研究领域:
环境科学
·
材料科学
·
石油工程
✓ 已验证
DOI
高影响因子
Materials
·
2016
·Vol. 9
·期 8
·690
·
IF 2.728
Qing-Qing Dai,Jun-Li Ren,Feng Peng,Xiao-Feng Chen,Cun-Dian Gao,Run-Cang Sun
Acylated xylan-based magnetic Fe3O4nanocomposite hydrogels (ACX-MNP-gels) were prepared by fabricating Fe3O4nanoctahedra in situ within a hydrogel matrix which was synthesized by the copolymerization of acylated xylan (ACX) with acrylamide andN-isopropylacrylamide under ultraviolet irradiation. The size of the Fe3O4fabricated within the hydrogel matrix could be adjusted through controlling the crosslinking concentrations (C). The magnetic hydrogels showed desirable magnetic and mechanical properties, which were confirmed by XRD, Raman spectroscopy, physical property measurement system, SEM, TGA, and compression test. Moreover, the catalytic performance of the magnetic hydrogels was explored. The magnetic hydrogels (C = 7.5 wt %) presented excellent catalytic activity and provided a sensitive response to H2O2detection even at a concentration level of 5 × 10−6mol·L−1. This approach to preparing magnetic hydrogels loaded with Fe3O4nanoparticles endows xylan-based hydrogels with new promising applications in biotechnology and environmental chemistry.Keywords:xylan;acylated xylan;magnetic hydrogels;Fe3O4nanoparticles;H2O2detection
研究领域:
材料科学
·
化学工程
·
分析化学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science China-Chemistry
·
2017
·Vol. 61
·期 2
·164-171
·
IF 4.132
Huang Xueqiong,Kong Long,Huang Shouqiang,Liu Min,Li Liang
In this work, we report the synthesis of magnetic sulfur-doped Fe 3 O 4 nanoparticles (Fe 3 O 4 :S NPs) with a novel simple strategy, which includes low temperature multicomponent mixing and high temperature sintering. The prepared Fe 3 O 4 :S NPs exhibit a much better adsorption performance towards Pb(II) than bare Fe 3 O 4 nanoparticles. FTIR, XPS, and XRD analyses suggested that the removal mechanisms of Pb(II) by Fe 3 O 4 :S NPs were associated with the process of precipitation (formation of PbS), hydrolysis, and surface adsorption. The kinetic studies showed that the adsorption data were described well by a pseudo second-order kinetic model, and the adsorption isotherms could be presented by Freundlich isotherm model. Moreover, the adsorption was not significantly affected by the coexisting ions, and the adsorbent could be easily separated from water by an external magnetic field after Pb(II) adsorption. Thus, Fe 3 O 4 :S NPs are supposed to be a good adsorbents for Pb(II) ions in environmental remediation.
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
LANGMUIR
·
2021
·
IF 3.882
Li Shixu,Zhou Jing,Liu Jun,Fu Jie,Yu Miao,Qi Song
Magnetorheological fluid (MRF) is an intelligent material, which can be controlled by an external magnetic field. It is widely used in damping, finishing, mechanical transmission, sealing, and other engineering fields due to its magnetorheological (MR) effect. However, despite decades of research and experimental development, the wide application of MRF is still restricted by its serious settlement problem owing to the density difference between the magnetic particles and carrier liquid. Here, using the coprecipitation method, a kind of Fe3O4-modified nanolignocellulose (Fe3O4/NLC) composite fiber was characterized by its unique advantages such as low density, soft magnetism property, and high specific surface. These Fe3O4/NLCs were used as a kind of reinforcing particle with carbonyl iron powder in the new bidisperse MRF system. The performances of MRF samples were enhanced by these superior properties. We found that all MRF samples with composite fibers exhibited excellent antisettlement and dynamic mechanical characteristics and cooperativity between Fe3O4 and NLCs. Furthermore, redispersibility of MRF is qualitatively evaluated by a shearing test in this paper, explaining the high property of antihardening. This composite fiber improves the comprehensive performance of MRF and has the potential to be repeatedly used in engineering applications.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2020
·Vol. 13
·期 21
·5047
·
IF 3.057
Jun Cao,Peng Wang,Jie Shen,Qi Sun
Here, using Fe3O4@SiO2as a precursor, a novel core-shell structure magnetic Cu2+adsorbent (Fe3O4@zeolite NaA) was successfully prepared. Several methods, namely X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR), Transmission electron microscope (TEM), Brunauer Emmett Teller (BET) and vibrating sample magnetometry (VSM) were used to characterize the adsorbent. A batch experiment was conducted to study the Cu2+adsorption capacity of Fe3O4@zeolite NaA at different pH values, contact time, initial Cu2+concentration and adsorbent does. It is found that the saturated adsorption capacity of Fe3O4@zeolite NaA on Cu2+is 86.54 mg/g. The adsorption isotherm analysis shows that the adsorption process of Fe3O4@zeolite NaA to Cu2+is more consistent with the Langmuir model, suggesting that it is a monolayer adsorption. Adsorption kinetics study found that the adsorption process of Fe3O4@zeolite NaA to Cu2+follows the pseudo-second kinetics model, which means that the combination of Fe3O4@zeolite NaA and Cu2+is the chemical chelating reaction. Thermodynamic analysis shows that the adsorption process of Fe3O4@zeolite NaA to Cu2+is endothermic, with increasing entropy and spontaneous in nature. The above results show that Fe3O4@zeolite NaA is a promising Cu2+adsorbent.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Qi Chen,Wenjing Wei,Jingjing Tang,Jinkun Lin,Songjun Li,Maiyong Zhu
Yolk@shell nanocomposites with delicate composition and tailored structure usually exhibit great potential in various areas. In the present study, the synthesis of yolk@shell Fe 3 O 4 @MnO 2 microspheres was reported using core@shell Fe 3 O 4 @polydopamine (Fe 3 O 4 @PDA) as starting materials. This novel approach is based on the reductive property of the PDA derived carbon shell. The new shell of MnO 2 was synthesized by reaction of PDA derived carbon and KMnO 4 . The Fe 3 O 4 @MnO 2 yolk@shell microsphere was successfully used as electrode material for supercapacitor and delivers a high specific capacitance of 715 F/g at 1 A/g with a good rate capability (450 F/g at 10 A/g). Furthermore, the Fe 3 O 4 @MnO 2 yolk@shell microsphere was also used as the positive electrode for asymmetric supercapacitors (ASC), wherein N doped carbon from PDA was applied as negative electrode. As a result, the energy density of the constructed ASC device was up to 31.3 Wh/kg at a power density of 750 W/kg. Meanwhile, the Fe 3 O 4 @MnO 2 //N-pC (PDA derived N-doped porous carbon) device offers an excellent cycling stability (94.7% of capacitance retention after 5000 cycles). Such distinguish capacitive performance is undoubtedly related to the electrochemical actuation of the yolk@shell microsphere structure and their structural integrity, where the void between the shell and yolk may relieve the volume change of the electrode. Considering the efficiency and simplicity of the synthetic procedure, it is expected that the present method might be suitable for preparation of yolk@shell composite with other components and structures, offering potential in various applications.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
He Zhang,Yu Mei,Fang Zhu,Fenting Yu,Sridhar Komarneni,Jianfeng Ma
A C@Fe 3 O 4 material, Fe 3 O 4 coated with carbon, was prepared by a simple one-pot hydrothermal method . The C@Fe 3 O 4 material was investigated with persulfate (PS) and light to degrade tetracycline (TC) as a function of pH, aeration conditions and quenching. Experimental results suggest that TC was effectively degraded in the C@Fe 3 O 4 /PS/Vis system. In addition, due to the availability of different main active species in this catalytic system, TC degradation was possible under both strong acid and strong alkali pH conditions. The presence of dissolved oxygen can also generate oxygen-active species, such as superoxide radicals (O 2 • - ) and singlet oxygen ( 1 O 2 ), to decompose TC organic matter in solution. Simply put, C@Fe 3 O 4 /PS/Vis catalytic system removed pollutants by the formation of O 2 • - , 1 O 2 , hydroxyl radicals (•OH) and sulfate radicals (SO 4 • - ) species for degrading TC. In addition, the stability of the C@Fe 3 O 4 material was found to be outstanding.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Peng Cheng,Chuang Liu,Sicong Du,Chongxuan Xu,Xu Han,Ting Zhu,Wenyan Liang
A novel magnetic separation method has been developed to efficiently separate and recover powder particles used in water or wastewater treatment processes. The magnetic composites were prepared through the grafting of 2,4-bis(dimethylamino)-6-chloro-(1,3,5)-triazine (BDAT), chitosan (CTS), and SiO 2 onto the Fe 3 O 4 surface, obtaining Fe 3 O 4 @BDAT, Fe 3 O 4 @CTS, Fe 3 O 4 @CTS-BDAT, Fe 3 O 4 @SiO 2 @BDAT, and Fe 3 O 4 @SiO 2 @CTS-BDAT. g-C 3 N 4 , Ni/Fe-PAC, and La/Al-BTC were chosen as the target particles. Results showed that Fe 3 O 4 @CTS-BDAT exhibited the best separation performance, achieving efficiencies of 98.3 %, 97.2 %, and 99.1 % for the three target particles, respectively. These high efficiencies were maintained over a broad pH range (3.0–11.0) and initial target particle concentrations (50–5000 mg/L). The target particles could be detached from the magnetic aggregates using an electromagnetic field, with efficiencies exceeding 75.3 %. Characterization using SEM, XPS, and FTIR revealed that Fe 3 O 4 @CTS-BDAT possessed a microsphere cluster structure, with a saturation magnetization of 64.02 emu/g, a point of zero charge (pH PZC ) of 7.7, and a d 50 value of 3.56 μm. Microscopic image analysis displayed that fluid kinetic energy and magnetic dipole force facilitated the formation of magnetic aggregates during the stirring stage. The size of these aggregates increased from 2–10 to 15–30 μm during stirring and further expanded to 18–37 μm during the separation stage. Particle image velocimetry (PIV) analysis indicated that the magnetic aggregates migrated towards the magnet via eddy currents, with maximum velocity from 0.532 to 1.412 m/s. DLVO and MDLVO models revealed that the magnetic interaction energy of Fe 3 O 4 @CTS-BDAT was sufficient to surpass electrostatic repulsion, thereby enabling efficient capture and separation of target particles.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA SCRIPTA
·
2024
·Vol. 99
·期 11
·115918
·
IF 2.6
Shengkai Liu,Cheng Chang,Boyu Chen,Han Song,Jiashen Fan,Yujie Fu,Zhiguo Liu
In this study, catechin-functionalized Fe3O4-Ag nanocomposites were synthesized by a hydrothermal method. The motivation for this study was to develop a novel antibacterial agent with enhanced stability and biocompatibility. The objective was to create a nanocomposite combining the antimicrobial properties of silver with the antioxidant and bioactive characteristics of catechin. We hypothesized that the synergistic effect of catechin and Fe3O4-Ag would yield a highly effective antibacterial material against common pathogens. The obtained nanocomposites were characterized by TEM, SEM, AFM, XPS, XRD, FTIR and physical property measurement system (PPMS). TEM images indicated that catechin-functionalized Fe3O4-Ag nanocomposites have a spherical morphology with an average size of 25.7 nm. The SEM and AFM imaging revealed that the nanocomposites appear as a number of large particles with average diameter of 581 nm. XPS and XRD and FTIR measurement confirmed the presence of catechin components, Fe3O4 and Ag in the nanocomposites. Taken together, we conclude that the catechin-Fe3O4-Ag nanocomposites in this study have a jujube cake structure in which the Fe3O4-Ag alloy nanoparticles serve as the jujube and the condensed catechin form into the cake substrate. The antimicrobial test indicated the catechin-functionalized Fe3O4-Ag nanocomposites have obvious inhibitory effects on E.coli, S.aureus, and C.albicans.
研究领域:
纳米生物学
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Y.H. Lei,G.J. Ye,B.C. Jiang,L. Wen,X.C. Mo,X.J. Lei,Y.L. Zhang,Y. Yuan,X.T. Chang
Developing a superhydrophobic a superhydrophobic anti-icing coating with robust mechanical attributes and chemical resilience is essential for effective anti-icing protection. This study employed fluorine-modified epoxy resin as the resin matrix and Fe 3 O 4 @PPy as the photothermal filler to fabricate an ice-resistant superhydrophobic coating, renowned for its exceptional mechanical endurance and corrosion resistance. With its unique micro-nano structure, the resulting coating exhibited an impressive contact angle (CA) of 158.7° and a minimal sliding angle (SA) of <1°. Even after enduring 260 cycles of sandpaper abrasion and tape peeling tests, the coating retained a CA of 157.8° and 154.2° respectively, demonstrating remarkable mechanical durability. The Fe3O4@PPy coatings exhibit excellent ice resistance with water droplets frozen time prolonging to 524 s at −20 °C. Moreover, when exposed to a light intensity of 100 mW/cm 2 , the coating rapidly heated to 82.4 °C, effectively facilitating de-icing and defrosting, while reducing ice adhesion strength by 88.4 %, underscoring its exceptional anti-icing efficacy. These findings underscore the potential of durable and chemically stable anti-·icing coatings to deliver sustained anti-icing benefits and hold promising practical applications.
研究领域:
材料科学
·
表面工程
·
化学工程
✓ 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）