JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2023
·Vol. 56
·期 43
·435503
·
IF 3.4
Ting Zhang,Xiaoyun Huo,Ling Wang,Fang Ma,Yafei Hou
Dielectric capacitors with satisfactory energy storage performances are highly demanded. Herein, x vol.% TO@FO@ethanediamine (EDA)-poly (vinylidene fluoride) (PVDF) nanocomposites combining the novel one-dimensional (1D) hybrid TiO2@Fe3O4@ethylenediamine (TO@FO@EDA NWs) as fillers and PVDF as matrix deliver the enhanced energy storage performances. Compared with the TO-, TO@EDA- and TO@FO- filled nanocomposites, TO@FO@EDA filled nanocomposites deliver the highest polarization, breakdown strength and energy storage performances because of the synergistic effects of 1D TO, conductive FO and EDA. As a result, the 2 vol.% TO@FO@EDA-PVDF nanocomposite shows the highest polarization difference (6.92 μC cm−3 at 435 kV mm−1), leading to an excellent discharged energy density (13.64 J cm−3), which is 192% higher than that of the pure PVDF (7.11 J cm−3). The primary results might provide a new solution to optimize the energy storage performances of polymer-based nanocomposites.
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JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Ruiyi Fan,Huiyu Min,Xingxing Hong,Qingping Yi,Wei Liu,Qinglin Zhang,Zhengrong Luo
In this paper, a new core-shell nanostructured magnetic bio-based composite was prepared by immobilizing persimmon tannin (PT) onto Fe 3 O 4 @SiO 2 microspheres, and the as designed Fe 3 O 4 @SiO 2 @PT was utilized for adsorptive recovery of Au(III) and Pd(II). The preparation, morphology, composition and magnetic property of Fe 3 O 4 @SiO 2 @PT were characterized. Adsorption parameters of Fe 3 O 4 @SiO 2 @PT towards Au(III) and Pd(II) including initial pH, reaction time, initial concentration of metal ions , effect of acidity and interference of coexisting metal ions were investigated. It is sufficiently confirmed that silica was coated on Fe 3 O 4 and persimmon tannin was immobilized on aminated Fe 3 O 4 @SiO 2 . The thickness of silica and loaded persimmon tannin are around 18 nm and 14 nm, respectively. With only 1.00 wt% of persimmon tannin, however, the maximum adsorption capacities of Fe 3 O 4 @SiO 2 @PT for Au(III) and Pd(II) were as high as 917.43 and 196.46 mg·g −1 , respectively. In addition, after adsorption of Au(III) and Pd(II), the magnetization saturation values ( Ms ) of Fe 3 O 4 @SiO 2 @PT were high enough to guarantee efficient magnetic seperation. Metallic gold could be facilely recovered from wastewaters containing Au(III).
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ELECTROANALYSIS
·
2019
·Vol. 31
·期 8
·1448-1457
·
IF 2.691
Fan Bai,Xinhao Zhang,Xinmei Hou,Huijuan Liu,Junhong Chen,Tao Yang
Amino-functionalized Fe 3 O 4 @carbon microspheres (NH 2 −Fe 3 O 4 @C) were prepared and the electrochemical sensor was constructed using NH 2 −Fe 3 O 4 @C modified glassy carbon electrodes (GCE) to determine toxic heavy metals in aqueous solution. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) were used to characterize the structure and phase of NH 2 −Fe 3 O 4 @C. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) results indicate that NH 2 −Fe 3 O 4 @C modified GCE possesses large active area and excellent electron transfer. Under optimized electrochemical condition, Cd(II), Pb(II) and Cu(II) were determined using NH 2 −Fe 3 O 4 @C modified GCE. The electrode through amino functionalization exhibits higher sensitivity and lower detection limit toward Cd(II) and Cu(II) due to the acid-base pairing interaction between the electron-rich −NH 2 ligand and the electron-deficient heavy metal ions. Compared with other similar results reported in the literature, the NH 2 −Fe 3 O 4 @C modified electrode exhibits wider linear response range while with comparable lower detection limit. It also exhibits excellent stability, reproducibility and anti-interference ability.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Yuxuan Zhao,Yueli Wen,Xiaonuo Xu,Maohong Fan,Shiyun Guo,Zhiju Chen,Xiaoxiao Zhao,Bin Wang,Wei Huang
The heavy metals discharged from electroplating wastewater, represented as copper and chromium ions, is harmful to aquatic lives and human beings, and will break the ecological balance. In this work, magnetic hybrid porous structure adsorbent of Fe 3 O 4 @SiO 2 -UiO-66-EDTA is prepared for recycling copper and chromium ions. The adsorbent exhibits a maximum adsorption capacity of 212.10 mg/g for Cu(II) and 118.10 mg/g for Cr(VI). Notably, it shows excellent regenerability of 87.12% after 5 cycles. The adsorption of Cu(II) and Cr(VI) on Fe 3 O 4 @SiO 2 -UiO-66-EDTA follows the pseudo-second-order model, where chemical adsorption is dominant and it occurs spontaneously and exothermally. Based on XRD, FTIR, XPS, and DFT calculations, the adsorption mechanisms are driven by electrostatic attraction, chelation, and redox reactions. This work provides a novel and promising strategy for designing highly efficient adsorbents, paving the way for more effective treatments of electroplating wastewater contaminated with Cu(II) and Cr(VI).
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BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Yongli Liu,Linyan He,Miao Liu,Yi Wang,Lin Li,Li Gu,Jinze Li,Shaowu Liu,Qiang He
This study examined the combination of activated carbon and magnetite with calcium peroxide in enhancing the anaerobic digestion (AD) performance of food waste (FW). The individual mechanisms of these two approaches were also clarified. The results indicated that AC/CaO 2 achieved the highest specific methane yield of 434.4 mL/g VS, followed by Fe 3 O 4 /CaO 2 (416.9 mL/g VS). Both were significantly higher than other groups (control, AC, Fe 3 O 4 , and CaO 2 were 330.1, 341.4, 342.8, and 373.2 mL/g VS, respectively). Additionally, compared to Fe 3 O 4 /CaO 2 , AC/CaO 2 further increased reactive oxygen species (ROS), thereby enhancing the hydrolytic acidification process. Simultaneously, the higher ROS levels of Fe 3 O 4 /CaO 2 and AC/CaO 2 promoted the formation of microbial aggregates and established a more robust enzymatic defense system and unique damage repair strategy. The research comparatively analyzed the synergistic mechanism of iron-based and carbon-based conductive materials with CaO 2 , providing new perspectives for optimizing the AD of FW.
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TALANTA
·
2015
·
IF 3.545
Mei Xu,Minhua Liu,Meirong Sun,Kun Chen,Xiujun Cao,Yaoming Hu
In this paper, novel core–shell structured magnetic Fe 3 O 4 /silica nanocomposites with triblock-copolymer grafted on their surface (Fe 3 O 4 @SiO 2 @MDN) were successfully fabricated by combining a sol–gel method with a seeded aqueous-phase radical copolymerization approach. Owing to the excellent characteristics of the strong magnetic responsivity, outstanding hydrophilicity and abundant π-electron system, the obtained core–shell structured microspheres showed great potential as a magnetic solid phase extraction (MSPE) adsorbent. Several kinds of phthalate esters (PAEs) were selected as model analytes to systematically evaluate the applicability of adsorbents for extraction followed by gas chromatography–mass spectrometry (GC–MS) analyses. Various parameters, including adsorbents amounts, adsorption time, species of eluent , and desorption time were optimized. Under the optimized conditions, Validation experiments such as recovery, reproducibility, and limit of detection were carried on and showed satisfactory results. The analysis method showed excellent linearity with a wide range of 0.2–10 mg/kg ( R 2 >0.9974) and low limits of detection (LOD) of 0.02–0.09 mg/kg ( S / N =3). Ultimately, the novel magnetic adsorbents were successfully employed to detect the PAEs in apparel textile samples. And the results indicated that this novel approach brought forward in the present work offered an attractive alternative for rapid, efficient and sensitive MSPE for PAEs compounds.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Xuyao Qiao,Shuguang Ning,Hongyao Zhao,Ruiting Ni,Wanyu Zhang,Yangping Zhang,Linzhi Zhai,Danhong Shang,Yanyun Wang,Tongyi Yang,Mengnan Wang,Fu Yang
Addressing the dual challenges of freshwater scarcity and pollution elimination requires innovative technologies that rationally integrate multiple functions. This study developed a representative dual-functional solar evaporator by coupling photothermal Fe₃O₄ nanospheres with oxygen-doped CdS (CdS-O) within a sponge-based hydrogel matrix, achieving concurrent high-efficiency solar-driven water regeneration and pollutant degradation. The design leverages the unique roles of two unique components, wherein, Fe₃O₄ endows the evaporator with broadband solar absorption (300–800 nm) and an superior photothermal conversion efficiency of 80 %, while oxygen doping CdS-O narrows its bandgap (from 2.31 eV to 2.29 eV), enhancing visible-light harvesting and charge separation. Crucially, the synergistic interplay between Fe₃O₄ and CdS-O establishes a self-sustained photo-Fenton-like mechanism. CdS-O generates H₂O₂ via photogenerated electron reduction of O₂, and Fe₃O₄ acts as an electron acceptor to accelerate Fe 3 + /Fe 2+ cycling, Fe²⁺ ions react with H₂O₂ via a Fenton-like process to produce ·OH radicals for pollutant mineralization. Simultaneously, the hydrogel-sponge architecture ensures rapid water transport and localized heat confinement, enabling an evaporation rate of 1.55 kg·m −2 ·h −1 under 1 sun irradiation. The system demonstrates remarkable dual-functionality: 86.9 % tetracycline degradation in lake water within 240 minutes and 89 % photocatalytic activity retention after six cycles. This work overcomes the limitations of conventional single-function systems by unifying photothermal evaporation and photocatalytic oxidation into a scalable platform, offering a sustainable solution for simultaneous water production and purification through material synergy and energy-efficient design.
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TALANTA
·
2025
·
IF 6.1
Tong Mu,Yudie Hu,Li Wen,Li Ding,Maolong Chen,Yunhui Cheng,Li Yao,Zhou Xu
Magnetic relaxation switch (MRS) sensors based on magnetic nanoparticles have received much attention in the field of environmental monitoring due to their rapid response and resistance to complex matrix interference. However, conventional MRS (cMRS) sensors constructed using magnetic nanoparticles have low sensitivity due to the lower relaxation rate of the magnetic probe. In this study, self-generated porous Fe 3 O 4 were employed in the MRS sensors for detection of caffeine, and the regulation of transverse relaxation performance by porous structure has been explored. The abundant porous structure of self-generated porous Fe 3 O 4 restricted the diffusion of the surrounding water molecules, and the controllable pore size can effectively adjust the apparent diffusion coefficient (ADC), as a result, improving the transverse relaxation properties. The developed MRS sensor exhibits a wide linear detection range from 0.5 to 100 ng/mL and a low limit of detection (LOD) of 0.047 ng/mL for caffeine. The LOD is 12 times lower than that of cMRS sensors. Consequently, the MRS sensor was further applied to the detection of caffeine in surface water samples. The results were consistent with those detected using high-performance liquid chromatography, demonstrating its superior anti-interference ability and the significant potential in environmental monitoring and food safety domains.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yue Wang,Xiangyan He,Qi Zhang,Ling Luo,Tianping Lv,Xiuwu Wang,Junhua Zhang
Construction of highly efficient catalysts is crucial for the catalytic transfer hydrogenation (CTH) of bio-based carbonyls to valuable chemicals and fuels. Herein, we successfully synthesized a series of uniformly dispersed Zr(OH) 4 -Fe 3 O 4 nanoparticles with the regulation of sodium dodecyl benzene sulfonate (SDBS), which exhibited exceptional activity for the CTH of furfural (FAL) into furfuryl alcohol (FOL). Systematic characterizations revealed that SDBS effectively modified the interaction between Fe 3 O 4 and Zr(OH) 4 , thereby enhancing Lewis acidity by facilitating the construction of electron-deficient zirconium sites. Meanwhile, the presence of oxygen vacancies and surface hydroxyl groups in Zr(OH) 4 -Fe 3 O 4 -SDBS facilitated the adsorption and activation of both substrate and hydrogen donor. Thanks to these synergistic effects, a complete conversion of FAL with an impressive selectivity towards FOL was achieved, with a remarkable turn-over frequency value reaching as high as 42.5 h −1 . Encouragingly, Zr(OH) 4 -Fe 3 O 4 -SDBS also demonstrated its universality in the CTH of carbonyl compounds by exhibiting remarkable separation capability while maintaining its activity and structure after being reused for 11 cycles without significant changes.
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Scientific Reports
·
2021
·Vol. 11
·期 1
·1-11
·
IF 4.38
Win Theint Theint,Khan Sikandar,Bo Bo,Zada Shah,Fu PengCheng
The purpose of this research was to determine the efficacy of iron oxide nanoparticles (Fe 3 O 4 -NPs) using microalgal products as a plant growth stimulant and antifungal agent. The work was conducted with the phyco-synthesis and characterization of Fe 3 O 4 -NPs using 0.1 M ferric/ferrous chloride solution (2:1 ratio; 65 °C) with aqueous extract of the green microalga Chlorella K01. Protein, carbohydrate and polyphenol contents of Chlorella K01 extract were measured. The synthesized microalgal Fe 3 O 4 -NPs made a significant contribution to the germination and vigor index of rice, maize, mustard, green grams, and watermelons. Fe 3 O 4 -NPs also exhibited antifungal activity against Fusarium oxysporum, Fusarium tricinctum, Fusarium maniliforme, Rhizoctonia solani, and Phythium sp. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) scanning electron microscopy (SEM), transmission electron microscopy (TEM), particle size analysers (PSA), and zeta potential (ZP) measurements were used to characterize these green fabricated magnetite NPs. FTIR analysis showed that the synergy of microalgal proteins, carbohydrtates and polyphenols is responsible for the biofabrication of iron nanoparticles. A spheroid dispersion of biosynthesized Fe 3 O 4 -NPs with an average diameter of 76.5 nm was produced in the synthetic process.
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RSC Advances
·
2015
·Vol. 5
·期 50
·40249-40257
·
IF 3.84
Zhimin Ren,Siqi Yu,Xinxin Fu,Lin Shi,Chunxiao Sun,Chenyao Fan,Qi Liu,Guodong Qian,Zhiyu Wang
In this study, we have demonstrated coordination-driven self-assembly between Fe3O4 and graphene sheets under a hydrothermal condition for the simple in situ synthesis of a 3D Fe3O4–graphene hybrid architecture (Fe3O4/G). Fine hierarchical Fe3O4 spheres were homogeneously dispersed and embedded in an interconnected mesoporous framework of graphene sheets. It can be noted that the critical concentration of GO assembly decreased dramatically during the self-assembly of Fe3O4, indicating the coordination-driven self-assembly between Fe3O4 and GO. When evaluated as an anode material for LIBs, the Fe3O4/G hybrid framework demonstrates a high reversible capacity of 1164 mA h g−1 over 500 cycles at a current density of 500 mA g−1 and a remarkable rate capability. The superior electrochemical performance is attributed to a strong adhesion force and synergistic effect between Fe3O4 and graphene sheets as well as formation of a 3D interconnected hybrid framework, which offers enhanced kinetics towards electrochemical reactions with lithium ions and provides space for alleviating the huge volume expansion that occurs during charge–discharge cycles.
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Frontiers in Bioengineering and Biotechnology
·
2021
·
IF 5.89
Wang Zhaoyu,Li Yang,Li Mingyi,Zhang Xiaohui,Ji Qingxia,Zhao Xiaojuan,Bi Yanhong,Luo Si
The conversion of flavonoid glycosides and their analogs to their lipophilic ester derivatives was developed by nanobiocatalysts from immobilizing Thermomyces lanuginosus lipase (TLL) on polydopamine-functionalized magnetic Fe3O4 nanoparticles (Fe3O4-PDA-TLL). The behavior investigation revealed that Fe3O4-PDA-TLL exhibits a preference for long chain length fatty acids (i.e., C10 to C14) with higher reaction rates of 12.6–13.9 mM/h. Regarding the substrate specificity, Fe3O4-PDA-TLL showed good substrate spectrum and favorably functionalized the primary OH groups, suggesting that the steric hindrances impeded the secondary or phenolic hydroxyl groups of substrates into the bonding site of the active region of TLL to afford the product.
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