POWDER TECHNOLOGY
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2020
·
IF 4.142
Xuekun Tang,Zishun Li,Kun Liu,Xianping Luo,Dongsheng He,Minlin Ao,Qian Peng
The application of a novel sulfidation modified Fe 3 O 4 nanoparticles (S-Fe 3 O 4 NP) as catalyst for degradation of dyes-containing wastewater through Fenton-like reaction is investigated in the current research. Results demonstrate the as-prepared S-Fe 3 O 4 NP is mainly composed of interconnected FeS 2 and sulfur-doped Fe 3 O 4 , which can be recovered from aqueous solution by magnetic separation method. S-Fe 3 O 4 NP/H 2 O 2 catalytic system exhibits great advantage and much higher catalytic performance over Fe 3 O 4 based Fenton-like process, which can effectively degrade RhB at wide pH range from 3 to 9. It also presents excellent recyclability in the first three cycles and high catalytic activity towards degradation of various azo dyes such as MB , MG and AR-73. The H + species, Fe 2+ ions and surface Fe 2+ active sites generated in the S-Fe 3 O 4 NP/H 2 O 2 system can significantly facilitate the production of hydroxyl radicals and this synergetic effect between FeS 2 and sulfur-doped Fe 3 O 4 leads to the enhanced catalytic performance of S-Fe 3 O 4 NP.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2021
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IF 4.291
Ao Li,Linbei Xie,Sijie Zhou,Min Zhang,Yi Ding,Ping Wang
In this study, the magnetic core-shell nanomaterial Fe 3 O 4 /SiO 2 /N-TiO 2 /Ag/AgCl (FSNT/Ag/AgCl) that efficiently degraded methyl orange (MO) was produced. The dosages of tetrabutyl titanate (TBOT), urea and AgNO 3 were optimized by response surface methodology (RSM). Scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy analysis (XPS), energy dispersive spectrometer (EDS), X-ray diffractometer (XRD), fourier transform infrared spectrometer (FT-IR), and UV–vis diffuse reflectance spectrum (UV–vis DRS) were used to characterize the nanomaterial. The particle size of FSNT/Ag/AgCl was 91.98 nm, and it presented a core-shell structure with Fe 3 O 4 as the core, SiO 2 and N-TiO 2 wrapped in Fe 3 O 4 , and Ag/AgCl deposited on the outermost layer. Performance and mechanism research experiments showed that under the optimized conditions of 1 g/L FSNT/Ag/AgCl, pH = 9, temperature of 35℃ and initial MO concentration of 10 mg/L, about 90 % of MO was degraded in 20 min. The mineralization rate was 35.2 % within 120 min. Holes (h + ) and superoxide anions (·O 2 − ) were the main active substances in the whole photocatalytic degradation. FSNT/Ag/AgCl could be recovered by magnet. After 5 repeated experiments, the degradation rate of MO within 100 min still reached 88.5 %. This work provides a recyclable core-shell nanomaterial for faster degradation of dye wastewater.
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Materials
·
2020
·Vol. 13
·期 20
·4527
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IF 3.057
Hui Liu,Ling Li,Xinxin Wang,Guangzhen Cui,Xuliang Lv
A novel CoS@Fe3O4@rGO aerogel with a unique 3D porous heterostructure was prepared via the solvothermal method, in which cobalt sulfide (CoS) microspheres embedded with Fe3O4nanoparticles were randomly scattered on reduced graphene oxide (rGO) flakes. The introduction of magnetic Fe3O4nanoparticles and rGO regulated the impedance matching, and the excellent electromagnetic wave (EMW) absorption capability of the CoS@Fe3O4@rGO aerogel could be attributed to optimal dielectric loss and abundant conductive networks. The results demonstrated that the minimum reflection loss (RL) value of CoS@Fe3O4@rGO aerogel was −60.65 dB at a 2.5 mm coating thickness with an ultra-wide bandwidth of 6.36 GHz (10.24–16.6 GHz), as the filler loading was only 6 wt%. Such a lightweight CoS@Fe3O4@rGO aerogel with an outstanding absorbing intensity and an ultra-wide effective absorption bandwidth could become a potential EMW absorber.Keywords:microwave absorption;rGO aerogel;CoS;porous structure
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 56
·期 2
·1386-1400
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IF 3.553
Tong Zhe,Lu Hailin,Guo Feifei,Lei Wenxing,Dong Mochen,Dong Guangneng
The CNTs@Fe 3 O 4 hybrids were synthesized via a modified co-precipitation method and aligned along the through-thickness of carbon fabrics-reinforced epoxy composites (CFRPCs) by applying a weak magnetic field. The effects of the length, orientation and concentration of CNTs@Fe 3 O 4 on the mechanical and tribological properties of CFRPCs were investigated. The results showed that the modified co-precipitation method decreased the size of Fe 3 O 4 nanoparticles (approximately 10 nm in diameter), promoting the dispersion of CNTs@Fe 3 O 4 in epoxy resin. The alignment of CNTs@Fe 3 O 4 hybrids significantly increased the interlaminar shear strength (ILSS) and hardness of CFRPCs. The long CNTs@Fe 3 O 4 can more effectively improve the ILSS of CFRPCs compared to short CNTs@Fe 3 O 4 . Besides, the addition of aligned CNTs@Fe 3 O 4 hybrids significant improves the tribological properties of CFRPCs. Compared to long CNTs@Fe 3 O 4 -reinforced CFRPCs, the short CNTs@Fe 3 O 4 -reinforced CFRPCs show the best tribological properties. The properties anisotropy of CNTs@Fe 3 O 4 and high CNTs@Fe 3 O 4 concentration in near surface of CFRPCs are the main reason for the improvement in tribological properties of CFRPCs.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Mingliang Ma,Yuying Yang,Yan Chen,Yong Ma,Ping Lyu,Aiqi Cui,Weibo Huang,Zhe Zhang,Yanzheng Li,Feiyan Si
The flower-like Fe 3 O 4 /SiO 2 /MnO 2 /BiOBr-Bi magnetic composite photocatalyst was prepared in this work. The combination of BiOBr and Bi metal with flower-like MnO 2 constituted a heterojunction structure, which increased the specific surface area of the photocatalyst and promoted the separation of photo-generated carriers, resulting in the enhanced catalytic performance. The morphologies and the compositions of the photocatalyst were characterized in detail. Under simulated light, the degradation of organic dye methylene blue (MB) was used to research the photocatalytic activity. In the case of 15 mg photocatalyst, it was found that the photocatalytic degradation efficiency to the MB solution was 95.23% within 150 min. Moreover, the degradation rate of MB could still reach 81.11% after four cycles. The design of flower-like composites with magnetic core-shell structure provided a new method for fabricating photocatalysts having excellent catalytic performance and cyclic stability.
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JOURNAL OF MOLECULAR LIQUIDS
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2020
·
IF 5.065
Mina Keshvardoostchokami,Mahyar Majidi,Abbasali Zamani,Bo Liu
Fe 3 O 4 /chitosan/ZIF-8 nanocomposite as a novel bio-adsorbent for phenol removal is reported in the current work. The nanocomposite was prepared in situ, and ZIF-8 particles with rhombic dodecahedron morphology were grown on the composite successfully. FTIR, XRD, FESEM, TEM, BET, and VSM were applied to analyze the nanocomposite physiochemically. Central composite design model (CCD) was applied to optimize effective factors such as phenol initial concentration, pH, time, and adsorbent dosage on phenol uptake. The optimum condition was 77.21% (6.43 mg/g) uptake of phenol from 20 mL solution with initial phenol concentration of 20.22 mg/L and pH = 9.91, by 0.1 g of the adsorbent after 43.44 min. The pseudo-second-order and Langmuir patterns as kinetic and isotherm models interpreted phenol adsorption very well. The current research presents a deep understanding of the formation of Fe 3 O 4 /chitosan/ZIF-8 nanocomposite, which has a suitable potential in phenol adsorption.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Yong Feng,Jie Zhong,Liyuan Zhang,Yiang Fan,Zequn Yang,Kaimin Shih,Hailong Li,Deli Wu,Bo Yan
Nanoscale zero-valent iron (nZVI) is highly promising for oxidative removal of micropollutants by initiating advanced oxidation processes , but its vulnerability to deactivation due to the surface oxidation is challenging. In this study, we propose Fe 0 @Fe 3 O 4 core–shell nanowires (CSNWs) as a novel activator to generate radicals for atrazine, a representative micropollutant, degradation via the activation of peroxymonosulfate (PMS). Fe 0 @Fe 3 O 4 CSNWs with a shell thickness of around 5 nm were synthesized using a facile chemical reduction approach and were comprehensively characterized using a series of surface sensitive techniques. The results showed that the Fe 0 @Fe 3 O 4 CSNW had great reactivity for atrazine degradation via the activation of PMS; near complete degradation of atrazine was achieved after reaction for only 2 min. Under identical conditions, the pseudo-first order rate constant with Fe 0 @Fe 3 O 4 was more than 36 times greater than that with nano Fe 3 O 4 . The surface activation of PMS contributed only a small proportion to the overall degradation. Instead, the iron released from Fe 0 @Fe 3 O 4 CSNWs primarily activated PMS to generate S O 4 ∙ - that degraded atrazine. The Fe 0 @Fe 3 O 4 CSNWs were stable and no deactivation was observed after exposing Fe 0 @Fe 3 O 4 CSNWs to air for 3 months. The results from this study demonstrate a stable nZVI for oxidative removal of organic contaminants.
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Alexandria Engineering Journal
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2020
·
IF 2.46
Saifeldin M. Siddeeg,Abdelfattah Amari,Mohamed A. Tahoon,Norah Salem Alsaiari,Faouzi Ben Rebah
For the simultaneous removal of water contaminants, a novel nanocomposite has been produced. The iron oxide core with silica shell was used to prepare functional magnetic polymer Fe 3 O 4 /SiO 2 /glycidyl methacrylate (GMA)-S-SH nanocomposite. The sulfur functional nanocomposite is suitable for the immobilization of laccase enzyme. The synthesized nanocomposite was characterized using FT-IR spectroscopy, SEM, TEM, XRD, and magnetometer. The effect of pH, temperature, and storage time over free and immobilized enzyme was studied that indicating the higher stability of immobilized enzyme than that free one. The prepared novel nanocomposite showed high adsorption capacity toward Cd +2 ions in addition to the degradation of meloxicam and piroxicam anti-inflammatory drugs. The removal efficiency reached up to 94% ± 2%, 92% ± 2%, and 95% ± 2% for Cd +2 ions, meloxicam, and piroxicam, respectively at optimum pH and temperature. Also, the results show that this nanocomposite is recyclable. The efficient removal of Cd +2 ions and pharmaceuticals can be reached up to four cycles. We conclude that the prepared nanocomposite is promising for water treatment.
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Biosensors-Basel
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2020
·Vol. 10
·期 3
·24
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IF 3.24
Shanshan Wei,Haolin Xiao,Liangli Cao,Zhencheng Chen
In this article, a highly sensitive label-free immunosensor based on a graphene oxide (GO)/Fe3O4/Prussian blue (PB) nanocomposite modified electrode was developed for the determination of human hepatitis B surface antigen (HBsAg). In this electrochemical immunoassay system, PB was used as a redox probe, while GO/Fe3O4/PB nanocomposites and AuNPs were prepared and coated on screen-printed electrodes to enhance the detection sensitivity and to immobilize the hepatitis B surface antibody (HBsAb). The immunosensor was fabricated based on the principle that the decrease in peak currents of PB is proportional to the concentration of HBsAg captured on the modified immunosensor. The experimental results revealed that the immunosensor exhibited a sensitive response to HBsAg in the range of 0.5 pg·mL−1to 200 ng·mL−1, and with a low detection limit of 0.166 pg·mL−1(S/N = 3). Furthermore, the proposed immunosensor was used to detect several clinical serum samples with acceptable results, and it also showed good reproducibility, selectivity and stability, which may have a promising potential application in clinical immunoassays.Keywords:hepatitis B surface antigen;electrochemical immunosensor;screen-printed electrode;graphene oxide;prussian blue
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MACROMOLECULAR MATERIALS AND ENGINEERING
·
2020
·Vol. 305
·期 4
·1900856
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IF 3.853
Fan Liu,Mengying Li,Fang Li,Kai Weng,Kun Qi,Chunhui Liu,Qingqing Ni,Xuejiao Tao,Jing Zhang,Weili Shao,Jianxin He
Electrospun electret filter material is widely studied because of its excellent removal effect on particulate matter from air streams. Here, a kind of high efficiency and low pressure drop nanofiber (NF) membrane with both electret effect and magnetic effect is developed, and compounded it with glass fiber mesh and polyester (polyethylene terephthalate) mesh to prepare a sandwich structure of NF anti-haze window screen. Under the synergistic effect of magnetic particles, when the density is 2.06 g m −2 , the filtration efficiency of NF anti-haze window screen can reach 99.95% for the fine particles below 0.3 µm, while the filtration pressure drop is only 58.5 Pa, with good light transmittance and excellent breaking strength (6.32 MPa). Therefore, polyvinylidene fluoride/Fe 3 O 4 composite NF membrane has a potential application prospect in the field of air filtration.
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ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Yajie Zhao,Binbin Ding,Xiao Xiao,Fan Jiang,Meifang Wang,Zhiyao Hou,Bengang Xing,Bo Teng,Ziyong Cheng,Ping’an Ma,Jun Lin
Nanomaterials with intrinsic peroxidase-like activities are able to catalyze the oxidation of the substrate with the peroxide, which have been widely considered as artificial enzymatic agents in cancer therapy. However, current peroxidase catalytic oxidation treatments generating reactive oxygen species rely highly on hydrogen peroxide and pH, which limit greatly their therapeutic efficiency in the tumor microenvironment. Here, we report a strategy to construct the complex virus-like Fe3O4@Bi2S3 nanocatalysts (F-BS NCs) by connecting typical peroxidase Fe3O4 (MNPs) with a narrow band gap semiconductor Bi2S3 (BS) to enhance the enzymatic activity resorting to the limited intratumoral peroxide and efficient external photothermal stimuli. In this formulation, the integrated F-BS NCs induce cancer-cell death through mild photothermal treatment and sequential photothermal-stimulative catalysis of H2O2 into highly toxic •OH under 808 nm laser, which successfully realize a remarkable synergistic anticancer achievement.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Xiangfeng Shu,Bo Fang,Wenjie Wu,Yenan Song,Zhenjie Zhao
We designed unique acicular or octahedral Fe 3 O 4 /rice husk-based activated carbon (AC) composites in electromagnetic wave (EMW) absorption. The key factors included the carbon layer structure and the regular metal oxide (Fe 3 O 4 ) morphology. Particularly, the experiments involved a thorough ball milling method on biological substrates, which would significantly improve the absorber performance than conventional treated steps. The microstructures were controlled flexibly by adjusting the ratio of activator and magnetizing agent. The formed pores and the regular structures enhanced multiple interface polarizations. The minimum reflectance ( R Lmin ) values of sample H4 reached –52.137, –41.918, –51.733, and –47.614 dB at 1.669, 2.002, 2.393, and 3.000 mm, respectively. The R Lmin values were mainly concentrated in C , X and Kμ bands, and the reflectance ( R L ≤ –10 dB) values covered a wide frequency range of approximately 13 GHz. In summary, the composites had the characteristics of interface engineering, high specific surface area, strong dielectric , and magnetic loss.
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