LANGMUIR
·
2023
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IF 3.9
Zhibiao Guo,Mingkun Wang,Lei Qiao,Jianxiang Wang,Zhiwei He
Frequent oil spills and the discharge of industrial oily wastewaters have become a serious threat to the environment, ecosystem, and human beings. Herein, a photothermal, magnetic, and superhydrophobic PU sponge decorated with a Fe3O4/MXene/lignin composite (labeled as S–Fe3O4/MXene/lignin@PU sponge) has been designed and prepared. The obtained superhydrophobic/superoleophilic PU sponge possesses excellent chemical stability, thermal stability, and mechanical durability in terms of being immersed in corrosive solutions and organic solvents and boiling water and being abrased by sandpapers, respectively. The oil adsorption capacities of the S–Fe3O4/MXene/lignin@PU sponge for various organic liquids range from 29.1 to 70.3 g/g, and the oil adsorption capacity for CCl4 can remain 69.6 g/g even after 15 cyclic adsorption tests. The separation efficiencies of the S–Fe3O4/MXene/lignin@PU sponge for n-hexane and CCl4 are higher than 98% in different environments (i.e., water, hot water, 1 mol/L NaOH, 1 mol/L NaCl, and 1 mol/L HCl). More importantly, the introduction of three light absorbers (i.e., Fe3O4, MXene, and lignin) into the S–Fe3O4/MXene/lignin@PU sponge shows a synergistic effect in the photothermal heat conversion performance, and the maximum surface temperature reaches 64.4 °C under sunlight irradiation (1.0 kW/m2). The separation flux of the S–Fe3O4/MXene/lignin@PU sponge for viscous LT147 vacuum pump oil reaches 35,469 L m–2 h–1 under sunlight irradiation, showing an increase of 27.3% compared to that of oil adsorption processes without the photothermal effect. Thus, the rational design of superhydrophobic sponges by introducing proper photothermal heat absorbers provides new insights into facile and cost-effective preparation of sponges for efficient oil/water separation.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Liangliang Zha,Chuanying Wei,Junjun Liu,Yang Yang,Bo Wu,Xianhui Zhang,Jianhua Wu
In recent years, MXene has gained widespread attention in the field of microwave absorption (MA) due to its unique two-dimensional layered structure, excellent electrical conductivity , and chemically active surface. However, the MA mechanism of MXene is limited to dielectric loss alone, which poses a challenge in meeting the performance requirements of new absorbers. Therefore, to enhance the performance of MXene in MA, this paper successfully prepared Fe 3 O 4 /NC@MXene (FNCM) composites by modifying core-shell magnetic nanoparticles of nitrogen-doped carbon coated Fe 3 O 4 (Fe 3 O 4 /NC) on MXene. By adjusting the dose of Fe 3 O 4 /PDA precursor, the impedance matching is further optimized. FNCM-2 demonstrates superior MA performance with a thickness of 2mm, achieving a minimum reflection loss (RL min ) of −54.41 dB and an effective absorption bandwidth (EAB) of 7.32 GHz. Meanwhile, the RL min of the FNCM-1 sample at a thickness of 2 mm can reach −55.65 dB. The remarkable improvement in MA performance can be attributed to the synergistic effect of dielectric and magnetic losses, which optimizes impedance matching. This study is expected to provide insights for the development of efficient and broadband MXene-based MA materials.
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Particuology
·
2023
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IF 3.5
Jiandong Cui,Xiuming Tang,Qingqing Ma,Yuyan Chang,Qunli Zhang,Shiru Jia
In this work α-amylase was immobilized on magnetic Fe 3 O 4 nanoparticles with polyethylenimine (PEI)/polydopamine (PDA) coating or 3-aminopropyl triethoxysilane (APTES) for the first time via adsorption–precipitation–cross-linking. Compared with the free α-amylase, the resultant magnetic cross-linked α-amylase aggregates (PEI/PDA-M-CLEAs and N-M-CLEAs) exhibited excellent thermal and storage stability as well as pH stability. After storage at 25 °C for 60 days, free α-amylase only retained 60% of its initial activity, while PEI/PDA-M-CLEAs and N-M-CLEAs retained 80% and 78% of their initial activities, respectively. Furthermore, N-M-CLEAs and PEI/PDA-M-CLEAs showed good reusability. After 6 repeated uses, PEI/PDA-M-CLEAs and N-M-CLEAs still maintained 65% and 62% of their initial activities, respectively. Especially, PEI/PDA-M-CLEAs and N-M-CLEAs exhibited higher starch hydrolysis efficiency than free α-amylase. The maximum dextrose equivalent (DE) values of starch hydrolysis by PEI/PDA-M-CLEAs and N-M-CLEAs reached 29.24% and 28.79% within 90 min, respectively. However, the maximum DE values of starch hydrolysis by the free α-amylase was only 27.89% even in 150 min. The magnetic cross-linked α-amylase aggregates could be introduced as effective biocatalyst for industrial applications in production of maltose syrups.
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TALANTA
·
2023
·
IF 6.1
Yao Zhao,Shu Zhang,Wang Yao,Yuxuan Zhu,Jing Qian,Juan Yang,Nianjun Yang
Hierarchically nanostructured binary transition metal oxide-based materials with high conductivity and catalytic activity are quite attractive for the electrochemical quantitative detection of environmental pollutants due to their natural abundance, variable oxidation state, and excellent synergies between metal sites. Herein, a new hierarchical MnO–Fe 3 O 4 @C/expanded graphite (EG) composite is designed and synthesized through a simple and in situ annealing method with the utilization of bimetallic organic framework (FeMn-MOF)/EG precursor. The synthesized MnO–Fe 3 O 4 @C/EG composite possesses a unique hierarchical nanoarchitecture that small-sized bimetallic oxide nanoparticles of 10–40 nm completely encapsulated by amorphous carbon layers of 2–4 nm are uniformly distributed on the EG platform. This distinctive structure combines the advantages of high conductivity, excellent catalytic activity, and strong stability. Resultantly, when it is applied to monitor environmental endocrine disruptors , the sensor exhibits a significant catalytic effect on the electrochemical oxidation of bisphenol A (BPA), inducing an amplified response current. In addition, the sensor shows a wide linear range of 1–50 μM and 50–400 μM for the BPA monitor, giving a sensitivity of 5208.8 and 1641.9 μA mM −1 cm −2 , respectively. This study offers a new approach to design hierarchical binary metal oxide-based sensing materials as well as to explore their electrochemical properties and applications for the determination of emerging contaminants.
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高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
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2023
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IF 4.6
Yuzhi Zhang,Zhaofeng Wu,Jun Sun,Qihua Sun,Fengjuan Chen,Lixiang Liu,Min Zhang,Haiming Duan
Chitin-based carbon fibers (CCFs) and Fe 3 O 4 /CCFs composites are prepared by simple carbonization at different temperatures, which are used as gas sensors for the first time. The effect of carbonization temperatures on the morphology, functional groups, composition , defects, conductivity and gas sensing performance of CCFs and Fe 3 O 4 /CCFs was investigated. The formation of Fe 3 O 4 nanoparticles and the conversion of chitin to carbon material during carbonization were also analyzed. It was found that the structure and gas sensing performance of CCFs and Fe 3 O 4 /CCFs could be controlled by adjusting carbonization temperature. Furthermore, compared with CCFs, the Fe 3 O 4 /CCFs composite showed better gas sensitivity due to the lots of heterojunctions between Fe 3 O 4 and CCFs. The response time and recovery time of the optimized sensor are no more than 30 s and 5 s, respectively. By controlling the carbonation temperature, the controlled CCFs and Fe 3 O 4 /CCFs showed good long-term stability, and the degradation of response is less than 10 % within three months. What’s more, due to the different gas sensing performances, the CCFs and Fe 3 O 4 /CCFs materials prepared at different temperatures were prepared into sensor arrays, which realized the discriminative detection of a variety of target analytes at normal temperature.
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Arabian Journal of Chemistry
·
2023
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IF 6
Li Wu,Qijie Mo,Shoulian Wei,Ruiping Gao,Shuai Zhang,Xiaohua Zhu
This study demonstrates a novel colorimetric method for clenbuterol (CLB) detection based on the peroxidase-like activity of SiO 2 -coated Fe 3 O 4 nanoparticles (Fe 3 O 4 @mSiO 2 ) modified with montmorillonite (MMT) and sodium dodecyl sulfate (SDS), namely, Fe 3 O 4 @mSiO 2 @MMT-SDS. Fe 3 O 4 @mSiO 2 @MMT-SDS nanoparticles were prepared by modifying Fe 3 O 4 @mSiO 2 with MMT and SDS to impart negative charges to the particle surfaces. The structural properties, steady-state kinetics, catalytic performance, and reaction conditions of the as-prepared nanoparticles were analyzed. Fe 3 O 4 @mSiO 2 @MMT-SDS nanoparticles exhibited excellent dispersion and enzyme-like activity, which improved the affinity with substrate (TMB and H 2 O 2 ) for the catalytic oxidation of CLB by H 2 O 2 , turning the solution blue in the presence of the 3,3ʹ, 5,5ʹ-tetramethylbenzidine chromogen. Under optimal reaction conditions, a strong linear correlation between the absorbance of solution and CLB concentration (R 2 = 0.9983) was observed. Here, the limit of detection, spike recovery, and relative standard deviation were 9.6 × 10 -9 mol · L -1 , 94.2 %–102.2 %, and 2.2 %–4.4 %, respectively. The proposed method is a simple, fast, cost-efficient, and sensitive assay, which can be used to rapidly and accurately screen CLB in pork and animal feeds.
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高影响因子
CHEMOSPHERE
·
2023
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IF 8.8
Yuanqing Guo,Quan Liu,Xiaobin Tang,Heng Liang,Guibai Li,Liwei Yang,Lu Wang,Xiaoling Li,Yan Sun
A photocatalytic membrane coated with α-Fe 2 O 3 /Fe 3 O 4 nanoparticles has been developed to address the challenges of membrane fouling and organic removal in the treatment of natural surface water. The photocatalytic and filtration properties of the membranes were investigated through a variety of methods. The successful preparation of iron oxide was confirmed by UV–vis diffuse reflectance spectra and X-ray diffractometry, with α-Fe 2 O 3 identified as the primary photocatalytic agent. A commercial ultrafiltration (UF) membrane was employed as a comparison to evaluate the photocatalytic performance and filtration properties of the modified membrane. Results showed that the photocatalytic membrane achieved better removal rates for UV 254 (22.0%) and specific fluorescent organic compounds, such as component 2 (19.38%) and component 3 (16.89%), compared to the control group. Furthermore, both irreversible and reversible fouling resistances of the prepared membranes were significantly lower than that of the control group, with reductions of 39.4% and 50.2%, respectively. The membrane coated with α-Fe 2 O 3 /Fe 3 O 4 nanoparticles exhibited moderate removal of protein-like and terrestrially derived humic-like fluorescent organics while controlling membrane fouling. Although the α-Fe 2 O 3 /Fe 3 O 4 nanoparticles-coated photocatalytic membrane demonstrated good anti-fouling properties, the removals of organic matters were not as effective as anticipated due to the shorter hydraulic retention time. This study provides valuable insights for enhancing pollutant degradation and anti-fouling properties of membranes through the utilization of solar photocatalytic α-Fe 2 O 3 /Fe 3 O 4 surface-modified membranes in the treatment of natural surface water.
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Journal of Environmental Sciences
·
2021
·
IF 5.565
Ruolin Cao,Shiqing Liu,Xinyu Yang,Chunfeng Wang,Yanbin Wang,Wanfeng Wang,Yunqing Pi
Although widely used in permeation reaction barrier (PRB) for strengthening the removal of various heavy metals, zero-valent iron (ZVI) is limited by various inherent drawbacks, such as easy passivation and poor electron transfer . As a solution, a synergistic system with PRB and electrokinetics (PRB-EK) was established and applied for the efficient removal of Cr(VI)-contaminated groundwater. As the filling material of PRB, ZVI/Fe 3 O 4 /activated carbon (ZVI/Fe 3 O 4 /AC) composites were synthesized by ball milling and thermal treatment. A series of continuous flow column experiments and batch tests was conducted to evaluate the removal efficiency of Cr(VI). Results showed that the removal efficiency of Cr(VI) remained above 93% even when the bed volume (BV) reached 2000 under the operational parameters (iron/AC mass ratio, 2:1; current, 5 mA). The mechanism of Cr(VI) removal by the PRB-EK system was revealed through field emission scanning electron microscopy images, X-ray diffraction, X-ray photoelectron spectroscopy, Fe 2+ concentration, and redox potential (E h ) values. The key in Cr(VI) reduction was the Fe 2+ /Fe 3+ cycle driven by the surface microelectrolysis of the composites. The application of an externally supplied weak direct current maintained the redox process by enhancing the electron transfer capability of the system, thereby prolonging the column lifetime. Cr(VI) chemical speciation was determined through sequential extraction, verifying the stability and safety of the system. These findings provide a scientific basis for PRB design and the in-situ remediation of Cr(VI)-contaminated groundwater.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Hang Jia,Xiao Zhang,Xuejun Zeng,Rui Cai,Zhouli Wang,Yahong Yuan,Tianli Yue
With the increased risk of wound infection caused by pathogenic bacteria, silver nanoparticles have been considered as potential antibacterial nanosystem. However, the challenge of size control and agglomeration of silver nanoparticles need to be considered. Herein, the application of flower-like silver nanoparticles (Ag NPs) anchored Fe 3 O 4 @SiO 2 @MnO 2 hybrids (Ag/FSM) in the control of pathogenic bacteria and promotion of wound healing were reported. TEM results indicated the ultrafine Ag NPs were uniformly dispersed onto the surface of FSM. In vitro experimental results showed the Minimum inhibitory concentration (MIC) of Ag/FSM against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) were 60 and 100 μ g mL −1 , respectively. Furthermore, in vivo investigation in mice demonstrated that the hybrids showed low toxicity and effectively promoted wound healing caused by the infection of E. coli . In summary, the results supported the possibility that Ag/FSM could be considered as an antibacterial agent with potential for the treatment of bacterial infections.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
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IF 5.316
Teng Chen,Yunlong Geng,Hongri Wan,Yan Xu,Yingmei Zhou,Xiangjun Kong,Jiaomei Wang,Yunhui Qi,Bing Yao,Zhaojian Gao
In this paper, Fe 3 O 4 /Ag/RGO reusable ternary nanocomposites are explored via a facile one-pot solvothermal strategies, and the catalytic performance and antibacterial activity are investigated in detail. The catalytic performance of Fe 3 O 4 /Ag/RGO towards the reduction of 4-NP into 4-AP is evaluated, and the reaction rate constant ( k ) for Fe 3 O 4 /Ag/RGO is calculated to be 0.03086 s −1 , which is higher than that of Fe 3 O 4 /Ag (0.01756 s −1 ), indicating the catalytic activity is improved after decorating Fe 3 O 4 /Ag onto the graphene sheet. The antibacterial experiment shows Fe 3 O 4 /Ag/RGO ternary nanocomposites present a wide range of antibacterial activities against Gram-positive bacteria ( S. aureus and B. cereus ) and Gram-negative bacteria ( E. coli and P. aeruginosa ). The minimal inhibitory concentrations (MIC) for Fe 3 O 4 /Ag/RGO nanocomposites against four bacterial species are determined. Additionally, Fe 3 O 4 /Ag/RGO nanocomposites also present high reusability as catalyst and antibacterial agent. The results illustrated in this paper imply that the multifunctional performances such as efficient reduction of 4-NP followed by superior anti-reproduction of pathogenic bacteria make the Fe 3 O 4 /Ag/RGO ternary nanocomposites a promising catalyst for dye-polluted water and disinfectant agent for wastewater treatment and purification.
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ACS Omega
·
2020
·
IF 2.87
Lu Lu Xiong,Rong Huang,Hui Hui Chai,Ling Yu,Chang Ming Li
A facile, cost-effective, and eco-friendly method was proposed to synthesize Fe3O4@tannic acid@Au nanocomposites (Fe3O4@TA@Au). First, Fe3O4 nanoparticles with diameters of 20 and 200 nm were synthesized by co-precipitation and solvothermal methods, respectively. Gold nanoparticles were deposited on magnetic Fe3O4 through tannic acid-metal-polymer intermediate-layer-mediated reductions. The catalytic activities of the as-prepared Fe3O4@TA@Au were investigated by spectroscopically monitoring the reduction of 4-nitrophenol (4-NP) and methylene blue (MB), which could be achieved within several minutes with an excess of NaBH4. The impact of the Fe3O4 size on the overall catalytic ability of the Fe3O4@TA@Au was systematically studied. The reaction rate constants of the Fe3O4-20 nm@TA@Au for 4-NP and MB reduction were 0.432 and 0.543 min–1, respectively. For the Fe3O4-200 nm@TA@Au nanocomposite, the optimized reaction rate constants for 4-NP and MB reduction were 3.09 and 0.441 min–1, respectively. Due to magnetic separation, the Fe3O4@TA@Au could be easily harvested and recycled. After five recycling cycles, the catalytic ability remained over 90%, and the recycling process could be completed in several minutes, highlighting its potential as a catalyst for 4-NP and MB removal.
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ACS Applied Nano Materials
·
2020
·
IF 0
Yuan Wang,Yan Zhang,Tian C. Zhang,Gang Xiang,Xinlong Wang,Shaojun Yuan
Efficient removal of trace arsenites [As(III)] in groundwater is a big challenge worldwide. In this study, magnetic Fe3O4@poly(p-phenylenediamine)@TiO2 (Fe3O4@PpPDA@TiO2) core–shell nanoparticles were synthesized for As(III) ions removal via the photocatalytic oxidation–adsorption process. Under dark conditions, the As(III) adsorption on the as-synthesized core–shell nanoparticles obeyed the pseudo-second-order kinetic model and reached adsorption equilibrium within 45 min with a removal efficiency of 36.5%. Under visible-light irradiation, approximately 92% of As(III) ions were transformed into relatively low-toxic As(V) ions via the Fe3O4@PpPDA@TiO2 core–shell nanoparticles, and the arsenic removal efficiency increased dramatically to about 81% owing to As(V) ions being simultaneously adsorbed on the nanocomposite surfaces. The photocatalytic oxidation mechanisms were attributed to the synergism of photogenerated holes, hydroxyl radicals, and superoxide radicals. The as-synthesized Fe3O4@PpPDA@TiO2 core–shell nanoparticles are potentially useful in purifying the trace As(III)-contaminated groundwater owing to their easy magnetic separation, high optical quantum efficiency, and visible-light photocatalytic activity.
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