MATERIALS RESEARCH BULLETIN
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2023
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IF 5.4
Wenjie Hou,Yan Xing,Claudia Li,Tong Li,Dong Liu,Lusi Ernawati,Jaka Sunarso,Xiuxia Meng
Metal-organic frameworks (MOFs) with intrinsic porosity and high specific surface area have aroused broad interests as a promising electromagnetic (EM) absorbing material. However, the introduction of magnetic components in MOFs has remained as a formidable obstacle for subsequent development. Herein, Fe 3 O 4 /Co-MOF composites were fabricated via a facile and scalable co-precipitation process. The microstructure and morphology of the composites were characterized and the combination of hollow Fe 3 O 4 and Co-MOFs was found to contribute towards the dissipation of incident waves due to the magnetic-dielectric synergistic effect. Impressive microwave absorption ability was obtained with a minimum reflection loss of –56.1 dB over a qualified bandwidth (7.9 GHz) at 2.0 mm. Moreover, the radar cross section simulation further confirmed the effective suppression of radar wave scattering using Fe 3 O 4 /Co-MOF composites. This study provides a versatile strategy for designing magnetic-dielectric composites based on MOFs as effective and broadband microwave absorbers.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Fang Chengqian,Liu Wanbing,Dai Yimin,Wang Zhiheng,Li Yaqi,Cai Ling,Liu Bo,Yang Siwen,Wang Junlong,Ding Xianglong,Zhang Yue-Fei,Li Yan,Wan Li
A novel magnetic hierarchically pillared Sep@Fe 3 O 4 /ZnAl-LDH composite was successfully synthesized via co-precipitation methods. The prepared Sep@Fe 3 O 4 /ZnAl-LDH composite were characterized via FTIR, XRD , XPS , SEM, TEM , BET and VSM . The results show that the Sep@Fe 3 O 4 /ZnAl-LDH composite have a hierarchical columnar structure with nanoscale structural unit (Fe 3 O 4 /ZnAl-LDH) and overall micron-scale morphology, and the obtained graded adsorbent has a large pore capacity and pore size distribution . The maximum adsorption capacities of the obtained samples for methyl orange ( MO) and Congo red ( CR) were 430 mg·g −1 and 832 mg·g −1 , respectively. Kinetic data of MO and CR adsorbed on as-prepared samples can well fit with pseudo-second-order model. The isothermal data of MO and CR adsorbed on Sep@Fe 3 O 4 /ZnAl-LDH match well with the Langmuir model. The thermodynamic results indicate that the adsorption process is spontaneous and endothermic. Besides, the adsorbent shows good stability and reproducibility in a reusable cycle. This study demonstrated that Sep@Fe 3 O 4 /ZnAl-LDH provides a new idea for the development of a novel hierarchical magnetic pillared adsorbent for the efficient removal of anionic dyes.
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DIAMOND AND RELATED MATERIALS
·
2022
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IF 3.806
Qi Qu,Huanhuan Wang,Qianpeng Dong,Yan He
In the current work, Ni-Co/CNTs networks were firstly produced by a simple annealing treatment of Ni Co PBA, which was then used as a carbon-based carrier and successfully deposited Fe 3 O 4 nanospheres via a classic hydrothermal reaction process. Additionally, the electromagnetic wave absorption performances of composites could be effectively affected by adjusting the mass ratio of the Fe 3 O 4 nanoparticles . The minimum reflection loss (RL min ) of −48.76 dB was achieved for Fe 3 O 4 @Ni-Co/CNTs-1# at 3.5 mm thickness. Meanwhile, Fe 3 O 4 @Ni-Co/CNTs-2# exhibited a wide effective absorption band (EAB) of 5.9 GHz (12.1–18 GHz) at a 2.0 mm matching thickness, suggesting that the Fe 3 O 4 @Ni-Co/CNTs composites were a promising absorber for electromagnetic wave absorption materials . Based on the synergistic effects of dielectric and magnetic losses generated by Ni-Co/CNTs and Fe 3 O 4 , respectively, and appropriately matched impedances, a new strategy for fabricating lightweight, thin-thickness, strong absorption, and wide-bandwidth materials was provided.
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Surfaces and Interfaces
·
2023
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IF 6.2
Shijun Nie,Juan Wu,Lan Wang,Fan Cheng,Zhengguang Sun,Xiaobo Chen,Hai Liu,Sheng Wen,Chunli Gong
The trade-off between ionic conductivity and mechanical properties is the key issue facing anion exchange membranes (AEMs) at present. Herein, a new strategy combing three-dimensional (3D) hierarchical nanoarchitecture and magnetic field orientation was proposed to prepare imidazolium-functionalized poly(2,6-dimethyl phenylene oxide) (ImPPO)-based composite AEMs with simultaneously improved ionic conductivity and mechanical strength. Magnetic Fe 3 O 4 @LDH microspheres using Fe 3 O 4 as the core and two-dimensional lamellar anion conductor, layered double hydroxide (LDH), as the shell were prepared through a simple co-precipitation method. The as-prepared Fe 3 O 4 @LDH was then incorporated into ImPPO matrix and induced by an external magnetic field to fabricate Fe 3 O 4 @LDH-orientated composite AEMs. The hierarchical-structured Fe 3 O 4 @LDH can not only effectively avoid the stacking of LDH laminates and thus fully play the ion conduction ability of LDH, but also contribute to the formation of continuous OH − ion transport pathway in the composite system after magnetic field induction. The magnetic-field-oriented membrane with 1% Fe 3 O 4 @LDH doping exhibited ionic conductivity of 128.9 mS cm −1 at 80 °C, which was 43.1% higher than that of pure ImPPO. Moreover, the high dry strength (30.7 MPa) and satisfactory wet strength and flexibility of the composite membrane were also obtained. The assembled direct methanol fuel cell demonstrated a peak power density of 11.7 mW cm −2 , and showed an OCV retention of as high as 94.7% after continuous operation for 100 h, indicating their great potential for fuel cell applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Qian Liu,Zhenrong Tan,Dafeng Zheng,Xueqing Qiu
In order to improve the effect of anti-tumor drugs, a magnetic delivery system for targeted drug was reported. Firstly, aminated lignosulfonate (ALS) and carboxymethyl chitosan (CMCS) were used to fabricate nano Fe 3 O 4 to obtain pH-responsive magnetic Fe 3 O 4 /CMCS/ALS nanoparticles. Then the nanoparticles were loaded with doxorubicin hydrochloride (DOX), realizing the targeted delivery and controlled release of anti-tumor drugs. It was found that the amount of crosslinking agent and emulsifier were the key factors affecting the morphology and size of the magnetic nanoparticles. Under optimized conditions, the particle size was about 79.9–169.9 nm, exhibiting excellent pH responsiveness. When the drug-to-material ratio was 11:10, the DOX loading rate and the encapsulation rate of the nanoparticles was 48.68 % and 86.23 %. While the Fe 3 O 4 /CMCS/ALS-DOX particles could release 63.14 %, 56.71 %, and 14.28 % of DOX at pH 4.0, 5.3, and 7.4, respectively. The results showed that the Fe 3 O 4 /CMCS/ALS particles exhibited excellent drug loading and release behavior based on the pH responsiveness, which could be described by Langmuir adsorption model and Fick's law of diffusion respectively. MTT assay and Live/dead staining experiments also showed that the drug-loaded particles had obvious growth inhibition on cancer cells.
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PubMed
高影响因子
MICROCHIMICA ACTA
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2022
·Vol. 189
·期 12
·1-11
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IF 6.408
Wang Jing,Xu Wei,Zhou Lin,Zhang Tianqi,Yang Na,Wang Min,Luo Xuemei,Jin Lu,Zhu Huaijun,Ge Weihong
The peroxidase-like activity of MXene@Fe 3 O 4 nanocomposites and the relevant colorimetric application have been investigated for the first time. According to a kinetic study, MXene@Fe 3 O 4 nanocomposites displayed higher peroxidase activity than their individual components, and the catalytic process followed a ping-pong mechanism. The improved peroxidase-like activity of the MXene@Fe 3 O 4 nanocomposites was obtained due to the synergetic impact of the Fe 3 O 4 and MXene phases, the huge ion-accessible interface, and quick electron transfer channels in the nanocomposites. In the presence of hydrogen peroxide (H 2 O 2 ), the MXene@Fe 3 O 4 nanocomposites can catalyze the reaction of the colorless substrate 3, 3, 5, 5-tetramethylbenzidine (TMB) into oxidized TMB which revealed a blue color at 652 nm. After the introduction of glutathione (GSH), the blue color was gradually fading owing to the hydroxyl radical scavenging effect of glutathione. A colorimetric detection platform based on the peroxidase-like activity of the MXene@Fe 3 O 4 nanocomposites was developed for H 2 O 2 and GSH with a detection limit of 0.4 μM and 0.5 μM, respectively. The calibration plot for glutathione detection is calculated by absorbance difference at 652 nm, which ranged from 0.5 to 10 μM with a detection limit of 0.2 μM. The recoveries of GSH with different concentrations ranged from 93.76 to 108.50% and the relative standard deviation from 0.30 to 5.96%. This work significantly extends the application of MXene@Fe 3 O 4 nanocomposites in the construction of colorimetric sensors and reveals a satisfactory result in real sample analysis. Graphical Abstract
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ACS Nano
·
2023
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IF 17.1
Dong Liu,Shahid Iqbal,Heng Gui,Jianchu Xu,Shaoshan An,Baoshan Xing
To understand microplastic–nanomaterial interactions in agricultural systems, a randomized block 90-day pot experiment was set up to cultivate ryegrass seedings in a typical red sandy soil amended with compost (1:9 ratio). Polyvinyl chloride (PVC) and polyethylene (PE) microplastic (MP) contaminants were added into pot soils at 0.1 and 10%, whereas nano-Fe3O4 (as nanoenabled agrochemicals) was added at 0.1% and 0.5% in comparison with chemical-free controls. The combination of nano-Fe3O4 and MPs significantly increased the soil pH (+3% to + 17%) but decreased the total nitrogen content (−9% to – 30%; P < 0.05). The treatment group with both nano-Fe3O4 and PE had the highest total soil C (29 g kg–1 vs 20 g kg–1 in control) and C/N ratio (13 vs 8 in control). Increased rhizosphere nano-Fe3O4 concentrations promoted ryegrass growth (+42% dry weight) by enhancing the chlorophyll (+20%) and carotenoid (+15%) activities. Plant leaf and root peroxidase enzyme activity was more significantly affected by nano-Fe3O4 with PVC (+15%) than with PE (+6%). Nano-Fe3O4 significantly changed the ryegrass bacterial community structure from belowground (the rhizoplane and root endosphere) to aboveground (the phylloplane). Under MP contamination, the addition of nano-Fe3O4 increased bacterial diversity (+0.35%) and abundance (+30%) in the phylloplane and further intensified the connectivity of ryegrass aboveground bacterial networks (positive association increased 17%). The structural equation model showed that the change in the plant microbiome was associated with the rhizosphere microbiome. Overall, these findings imply the positive influences of nano-Fe3O4 on the soil–microbe–plant system and establish a method to alleviate the harmful effects of MP accumulation in soils.
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Molecular Catalysis
·
2023
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IF 4.6
Yuxi Qin,Adeel Ahmed,Shahid Iqbal,Muhammad Usman
In the current research study, β-cyclodextrin modified Fe 3 O 4 (β-CD@Fe 3 O 4 ) superparamagnetic composite materials were synthesized using co-precipitation and ultrasonication methods, with β-CD acting as a coating material. The as-prepared material was employed as a heterogeneous catalyst for the activation of peroxymonosulfate (PMS) for the removal of norfloxacin (NOR). The catalytic activities of bare Fe 3 O 4 , β-CD@Fe 3 O 4 composites, and the β-CD@Fe 3 O 4 /PMS system were compared under various parameters. Results revealed that the β-CD@Fe 3 O 4 /PMS exhibited higher catalytic activities, and a removal efficiency of 99.12% with a rate constant of 0.1576 min −1 was achieved in 30 min under optimum conditions ([catalyst] = 0.4 g/L, [PMS] = 4.0 mM, [NOR] = 30 mg/L, pH = 7.0). In particular, the larger surface area of β-CD@Fe 3 O 4 (120 m 2 g −1 ) and the presence of additional reactive sites accelerated the activation of PMS in comparison to bare Fe 3 O 4 (70 m 2 g −1 ) and thereby promoted the mineralization of NOR. The impact of various pivotal factors on NOR abatement was also studied. Scavenging results and the EPR technique revealed that the SO 4 •− , • OH, and O 2 •− radicals participated in the removal of NOR in the β-CD@Fe 3 O 4 /PMS system. The Fe 3+ /Fe 2+ /Fe 3+ redox cycle in β-CD@Fe 3 O 4 is used for the activation of PMS and generates radicles. The reusability results show excellent stability of the catalyst material, and a loss of 4.35% was observed after four cycles. The results revealed that the β-CD@Fe 3 O 4 composites can activate PMS and have potential for the degradation of various pollutants from the environment.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Miaomiao Sun,Yuzeng Zhao,Honghua Ge
Using conductive carbon black (CCB) as a carrier, a heterogeneous catalyst with Fe 3 O 4 as the active material (Fe 3 O 4 /CCB) was prepared by the impregnation method, and its performance in degrading of high-concentration methyl orange (MO) wastewater in the three-dimensional electro-Fenton system (3DEF) was explored. Characterization by TEM and XRD showed that Fe 3 O 4 was uniformly loaded on CCB, and due to the synergistic effect of Fe 3 O 4 and CCB in promoting degradation of pollutants, the degradation rate of this catalyst was 2.14 times higher than that of Fe 3 O 4 alone. Under the optimal conditions, the COD removal rate and MO decolorization rate reached the maximum, values of 75.02% and 93.75%, respectively. After 5 cycles, the MO degradation rate was still 83.83%, indicating that the prepared particle electrode has good reusability. In addition, a reasonable catalytic mechanism of the 3DEF system for MO mineralization was proposed, confirming that the hydroxyl radicals were particularly important in the oxidation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Yanhua Lei,Mengchao Ding,Sha Cheng,Da Huo,Fei Zhang,Tao Liu,Yuliang Zhang
The transition metal sulfide MoS 2 has attracted great interest from the scientific community as an excellent co-catalyst for promoting Fe 2+ /Fe 3+ cycling in advanced oxidation processes to enhance the efficiency of H 2 O 2 decomposition. A photothermal-enhanced photo-Fenton pollutant degradation strategy was proposed. Hybrids of magnetically recyclable Fe 3 O 4 fabricated 1 T-2 H MoS 2 (1 T-2 H MoS 2 @Fe 3 O 4 ) with excellent photothermal conversion efficiency were fabricated to overcome the limitations of relatively low catalytic activity and cycling stability in Fenton reaction. XRD , Raman, TEM and hysteresis loop were employed to evaluate the heterogeneous phase 1 T-2 H MoS 2 nanoflowers as well as the magnetic property . The 1 T-2 H MoS 2 @Fe 3 O 4 hybrids with excellent photothermal conversion efficiency not only enhance the reaction temperature of the Fenton reaction occurring on the material surface, but also demonstrate an effective interfacial photothermal water evaporation efficiency. Due to the synergistic effect of photocatalysis and photo-Fenton catalytic reaction , a quick degradation of simulated pollution were achieved in 5 mins with 98.3% degradation, which could be further improved to 99% due to the photothermal promoting reaction. The 1 T-2 H MoS 2 @Fe 3 O 4 hybrids exhibit good magnetic recyclability, cyclic stability and photothermal performance, which endow it a wide potential application in the field of environmental remediation and the field of water evaporation at the photothermal interface, etc.
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-11
·
IF 17.694
Dong Haijiao,Du Wei,Dong Jian,Che Renchao,Kong Fei,Cheng Wenlong,Ma Ming,Gu Ning,Zhang Yu
As pioneering Fe 3 O 4 nanozymes, their explicit peroxidase (POD)-like catalytic mechanism remains elusive. Although many studies have proposed surface Fe 2+ -induced Fenton-like reactions accounting for their POD-like activity, few have focused on the internal atomic changes and their contribution to the catalytic reaction. Here we report that Fe 2+ within Fe 3 O 4 can transfer electrons to the surface via the Fe 2+ -O-Fe 3+ chain, regenerating the surface Fe 2+ and enabling a sustained POD-like catalytic reaction. This process usually occurs with the outward migration of excess oxidized Fe 3+ from the lattice, which is a rate-limiting step. After prolonged catalysis, Fe 3 O 4 nanozymes suffer the phase transformation to γ-Fe 2 O 3 with depletable POD-like activity. This self-depleting characteristic of nanozymes with internal atoms involved in electron transfer and ion migration is well validated on lithium iron phosphate nanoparticles. We reveal a neglected issue concerning the necessity of considering both surface and internal atoms when designing, modulating, and applying nanozymes.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Daoping Ye,Wenxiang Tang,Tao Zhang,Li Lv,Zongpeng Zou,Raju Kumar Gupta,Shengwei Tang
CO 2 hydrogenation to olefines is a feasible carbon capture and utilization (CCU) route. The process includes sequential reactions of reverse water gas shift (RWGS) reaction and Fischer-Tropsch synthesis (FTS) reaction. The acceleration of FTS is crucial to improve the olefines yield. A microemulsion anti-solvent extraction (MAE) method was proposed to prepare Fe-based catalyst on the support of Al 2 O 3 . Ethanol solution of Fe(NO 3 ) 3 was encapsulated in microdroplets, and then loaded on Al 2 O 3 by the extraction of ethanol from the microdroplets to isooctane phase. The average size of micro droplets was 7.5 nm. After calcination , the particle size of Fe 2 O 3 was 6 nm. After carburization with CO, the interface formed between Fe 3 O 4 and Fe 5 C 2 was restricted in a narrow space with a mean size of 12 nm. Through TEM-Mapping, XRD , XPS and TPC characterization, the distribution uniformity of Fe and the neighboring degree of Fe 3 O 4 and Fe 5 C 2 on the as-prepared catalyst MAE-Fe 1 K 1 was improved effectively. An enhanced synergistic effect between Fe 3 O 4 and Fe 5 C 2 was obtained. The catalytic performance evaluation results showed that yield of C 2 -C 4 olefins reached 0.063 mmol·gFe −1 ·s −1 after 12 h of reaction. It exhibited better catalytic performance than most catalysts reported in the literatures. The results showed that the proposed microemulsion anti-solvent extraction strategy is an effective method to prepare Fe-based catalyst for CO 2 -FTO reaction with an excellent catalytic performance.
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