JOURNAL OF ENVIRONMENTAL ENGINEERING
·
2020
·Vol. 146
·期 3
·04020005
·
IF 1.264
Xiaoshu Wei,Xiaomin Xie,Yi Wang,Sen Yang
Octahedral and spherical Fe3O4 nanoparticles (NPs) were synthesized and used as heterogeneous Fenton-like catalysts to degrade methylene blue (MB). Their catalytic activities were investigated by evaluating the effects of pH, catalyst dosage, H2O2, and MB concentration on the removal efficiency of MB and total organic carbon (TOC). Nearly complete color removal was achieved in 20 min at pH 3.0 in both Fenton-like systems with a low H2O2 concentration of 1.0 mmol L−1. Removal of >90% MB was achieved in the fifth and third runs by octahedral and spherical Fe3O4 NPs, respectively, and the two catalysts eliminated 77.1% and 62.9% of TOC in solution in 30 min of the first cycle. The removal rates of MB as a function of surface area were slower in the presence of spherical than octahedral Fe3O4 NPs, indicating shape-dependence of the NPs’ Fenton-like catalytic activity. The catalytic activity and reusability of octahedral Fe3O4 NPs were superior to that of spherical NPs. HO· was found to be the main active species in the Fenton-like system.
研究领域:
环境科学
·
纳米技术
·
催化
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Lingwei Li,Huan Wang,Jixiang Fang
Magnetic fluorescent composite nanomaterials have broad application prospects in the fields of biological imaging, anticounterfeiting identification, suspicious object tracking, and identification of latent fingerprints in forensic medicine. For an effective taggant, a clearly visible identifying mark is necessary to enable observers to capture labeling information quickly and accurately, even from a distance. The preparation method of magnetic fluorescent composite materials is complicated and usually needs different surface modification and assembly processes. The limited loading capacity of fluorescent materials also limits the fluorescence properties of the composite, so it is difficult to produce obvious fluorescence as a taggant to meet the requirements of visible labeling. In this study, a core–shell structure of a magnetic fluorescent composite was prepared by using the metal–organic framework ZIF-8 as the host of fluorescent materials and an encapsulation shell coated on the Fe3O4 nanoparticles. The porous ZIF-8 is beneficial for increasing the loading capacity of fluorescent materials to ensure the fluorescence performance of the composite materials. Further modification of the composite surface prevented the desorption of fluorescent materials from the pores of ZIF-8, enabling the samples to maintain good fluorescence properties even after multiple washing cycles. The preparation method is simple, rapid, and cost-effective, and the prepared magnetic fluorescent composite nanomaterial has high magnetic separation performance and fluorescence performance, making it a promising material for identification, marking, and tracking.
研究领域:
材料科学
·
生物医学工程
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Zhen Wang,Zhi Cheng,Li Xie,Xianliang Hou,Changqing Fang
Ti 3 C 2 T x MXene has been explored as an efficient electromagnetic interference (EMI) shielding material because of its high electrical conductivity , large specific surface area, rich surface defects , and abundant functional groups. Herein, core-shell Fe 3 O 4 @PANI composites were prepared, followed by the preparation of a flexible and lightweight Ti 3 C 2 T x /Fe 3 O 4 @PANI composite film with sandwich intercalation structure by vacuum-assisted filtration, using Ti 3 C 2 T x MXene as a matrix material. The ultrathin composite film with a Ti 3 C 2 T x nanosheets to Fe 3 O 4 @PANI weight ratio of 12:5 reached a maximum EMI shielding effectiveness (SE) value of 58.8 dB at a thickness of only 12.1 μm. This is much higher than the SE of pure conductive Ti 3 C 2 T x films of the same thickness. After adjusting the film thickness by increasing the concentration of Ti 3 C 2 T x , an SE of 62 dB was achieved at a thickness of 16.7 μm. The ultrathin Ti 3 C 2 T x /Fe 3 O 4 @PANI films exhibit potential for application in packaging, wearable electronic equipment, and military fields. Moreover, they provide insight into the preparation of lightweight and progressive electromagnetic shielding materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 70
·56974-56981
·
IF 3.84
Songfang Zhao,Yongju Gao,Jinhui Li,Guoping Zhang,Rong Sun,Ching-Ping Wong
A novel protocol to prepare multifunctional magnetic organic–inorganic nanostructured catalysts of Fe3O4@organosilicon/Ag with tailored properties is developed. Such nanostructure design endows the catalysts with superparamagnetism (11.6 emu g−1), excellent oxidation resistance, and catalytic activity. Fe3O4 nanoparticles (NPs) are encapsulated with porous organosilicon via improved self-assembly of a flexible-bridged organosilicon precursor without templates. Subsequently, dispersed Ag NPs are in situ grown on the porous microparticles via a silver mirror reaction. The as-prepared multifunctional catalysts are characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, a vibration sample magnetometer, X-ray diffraction, thermal gravimetric analysis, and nitrogen adsorption and desorption, respectively. The resultant hybrid microparticles possess micro- and nano-pores, and exhibit a small hysteresis loop and low coercivity. Meaningfully, they exhibit exceptional catalytic performance for the reduction of 4-nitrophenol in the presence of sodium borohydride and could be reused at least 9 times with excellent stability by means of convenient magnetic separation. The catalysts could be employed to reduce other dyes such as methylene blue, orange G and rhodamine B, and their corresponding reductions follow pseudo-first-order reactions. Therefore, the proposed structure design and scalable route for the synthesis of hierarchical catalysts can pave the way for synthesizing other catalyst systems to address the diverse reaction demands.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Qianwen Xue,Weihao Wu,JiangQin Wu,Yuxuan Zhang,Xiaofang Gao,Zaosheng Lv,Yang Lei,Yanfen Huang
Superhydrophobic coatings are ideal for industrial applications involving oil spill cleaning, de-icing, anti-fouling, and anti-icing. The majority of current superhydrophobic coating preparation techniques have significant costs and pollute the environment, which are incompatible with the principles of sustainable green development. In this study, we produced a superhydrophobic coating based on the low-cost green material chitosan, Fe 3 O 4 nanoparticles, and octadecylamine, which possesses photothermal characteristics and magnetic oil-water separation properties. Among these, octadecylamine supplied a lower surface energy and nano-Fe 3 O 4 supplied the coating's surface roughness structure. Under simulated sunlight, the fabricated coatings produced a pronounced photothermal effect. The surface temperatures of the polyurethane sponge coating and the cotton fabric coating rose to 144.6 °C and 117.5 °C, respectively, after just 5 min. Furthermore, the coatings can be used for magnetically-driven oil-water separation with a certain degree of recyclability. The oil-water separation efficiency of the coating can reach 92% and above. More importantly, the coating also has excellent mechanical stability and self-cleaning properties. Therefore, this cheap and environmentally friendly nano-Fe 3 O 4 /chitosan-based superhydrophobic coating has great potential for application.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Jianyu Mao,Wei Jiang,Junjun Gu,Shuai Zhou,Yue Lu,Tan Xie
In this article, magnetic P (St-DVB)/Fe 3 O 4 microspheres with hollow and porous structure were successfully fabricated by a seed swelling polymerization process for fast and selective absorption of oils from water surface. These microspheres, with unsinkable, magnetic, hydrophobic and oleophilic properties, were used to absorb different oils up to 8.42 times of the particles’ weight while repelling water completely. More importantly, the oil-absorbed microspheres could be removed from water surface efficiently via introducing an external magnetic field. This material also shows excellent reusability after washing with ethanol and the oil-absorption capacity of the material was not sharply reduced even after the 10th cycle. The discoveries presented in this study might provide a low-cost, effective, and environmental-friendly approach for the clean-up of oils and organic solvents on the water.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2013
·
IF 2.915
Jie Cui,Ting He,Xu Zhang
Platinum ion doped magnetic TiO 2 (Fe 3 O 4 @SiO 2 @Pt ion –TiO 2 ) hybrid microspheres with uniform magnetic cores were synthesized and characterized in this work. The results indicate that the photoactivity of Fe 3 O 4 @SiO 2 @Pt ion –TiO 2 is much higher than Fe 3 O 4 @SiO 2 @TiO 2 for the decolorization of acid orange 20 under UV–visible light irradiation. The trend for the final degradation ratio with Fe 3 O 4 @SiO 2 @Pt ion –TiO 2 is quite small, even after seven repetitive experiments. These data indicate that the magnetic microspheres possess the potential to be effective and stable catalysts. The results demonstrate that the Pt ion doped magnetic catalyst meets the needs for both immobilization and high photoactivity.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Yang Wang,Xiang Chen,Zheng Zhang,Ting Li,Xuhui Zhang,Bihua Xia,Mingqing Chen,Tianxi Liu,Weifu Dong
Natural nacre, often referred as nature’s armor, has a typical “brick-and-mortar” hierarchical micro-/nanoscale multilayer microstructure and remarkable tensile strength and toughness. The highly ordered multilayer microstructure of nacre provides valuable insights into constructing advanced nanocomposites. Although significant success has been achieved in simulating artificial nacre-mimetic materials on a laboratory scale, it is still difficult to apply on a large scale because of time-consuming sequential depositions. In this study, a rapid and large-scalable magnetic assembly process for the fabrication of the graphene oxide (GO)-based composite film that mimics the structure of nacre was reported. Magnetic GO nanosheets were synthesized by decorating Fe3O4 nanoparticles on the surface of GO nanosheets and then assembled with poly(vinyl alcohol) (PVA) solution to form nacre-mimetic nanocomposites via the magnetic assembly technique. The tensile strength and toughness of the MGO–PVA film can reach 248.0 ± 6.7 MPa and 7.0 ± 0.5 MJ·m–3, which are 5.0 and 4.0 times higher than the pure MGO film, respectively. More interestingly, after in situ reduction by hydroiodic acid, the tensile strength reached as high as 340.0 ± 6.2 MPa. This work offers a rapid process of fabricating strong integration nacre-inspired materials, which shows applications in engineering, aerospace, flexible energy devices, and electromagnetic interference shielding materials.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Bing zhang,Yu-lian Li,Li Wang,Haoyuan Cai
Conventional surface plasmon resonance (SPR) sensor often fails to detect low-concentration small molecules due to insufficient refractive index changes. To address this challenge, we have developed an enhanced SPR sensor utilizing Fe 3 O 4 @Au@polydopamine (PDA) core–shell magnetic nanoparticles as signal amplification tags for the detection of tebuconazole (TBZ). These nanoparticles improve sensitivity through their high refractive indices and enable TBZ enrichment from complex matrices via their magnetic properties. The sensor surface is further modified with PDA, which acts as a reducing agent for Au nanoparticle deposition, enhancing monoclonal antibody (Ab) immobilization and boosting the SPR signal. Our optimized sensor reaches a limit of detection (LOD) at 0.61 ng/mL for TBZ, with a linear response from 1-200 ng/mL, and demonstrates high selectivity and reproducibility, ideal for pesticide monitoring in food samples.
研究领域:
分析化学
·
食品科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Xinpeng Chen,Aijing Li,Ping Yao,Jiapeng Wang,Tieling Xing,Guoqiang Chen
In this work, sea urchin-like magnetic Fe3O4@CA/BNNS/AgNP composite microspheres were successfully prepared. The photocatalytic performance of composite microspheres for the organic dye rhodamine B (RhB) was systematically investigated under different conditions, and the catalytic degradation rate of RhB was as high as 95% within 60 min; after three cycles of recycling, the degradation rate of RhB was reduced by only 8%. The main active agents in the reaction are e– and •O2–. Fe3O4@CA/BNNS/AgNP microspheres prepared in this study exhibit photocatalytic and electrochemical properties, making them easy to separate. This work is not limited to the development of Fe3O4-based catalysts but also is expected to provide ideas for the research and progress of photocatalytic composite catalysts with electrochemical properties.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Benjie Zhu,Guofei Jiang,Yan Lv,Fang Liu,Juan Sun
In oilfield produced water, polyacrylamide (PAM) is a kind of organic polymer , which may gradually degrade to produce a large number of acrylamide (AM) monomer , and cause great damage to the peripheral nervous system of human and animals. In order to improve its removal efficiency, rGO@Fe 3 O 4 /Cu 2 O@ZnO magnetic composites with strong hydrophobicity , high photocatalytic performance and recyclability was prepared. The degradation process of PAM on composites photocatalyst was studied by simulating the sunlight irradiation, and the magnetic recovery performance and photocatalytic stability of composite were explored. Finally, the photocatalytic degradation mechanism of rGO@Fe 3 O 4 /Cu 2 O@ZnO composite was discussed by free radical capture experiment. The results showed that the highest photocatalytic degradation efficiency was 97.3% when the mass ratio of GO@Fe 3 O 4 and Cu 2 O@ZnO was 1:5, the dosage of rGO@Fe 3 O 4 /Cu 2 O@ZnO was 0.6 g L −1 , pH value was 7 and the initial concentration of PAM was 100 g L −1 . After four cycles, the magnetic recovery and degradation efficiency of PAM can still up to 91.3% and 81%, respectively, which both meet the needs of magnetic recovery and photocatalysis . In addition, according to the free radical capture experiment, the main active species was superoxide radical (·O 2− ). This work provides a strategy for designing magnetic composites with hydrophobic and high catalytic for photodegradation of organic pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Lubrication Science
·
2024
·Vol. 36
·期 6
·468-477
·
IF 1.8
Han Yu,Min Li,Jianfang Sun,Jingying Su,Fenghua Su
As an emerging two-dimensional material, black phosphorus (BP) has excellent tribological properties, but the poor dispersion of BP in oil inhibits its application in friction to some extent. Surface modification is one of the effective methods to solve the dispersibility of BP, and the use of nano-Fe 3 O 4 dotted on the surface of BP improves the dispersion stability of BP in soybean from 3 days to about 15 days. Compared with pure soybean oil, friction coefficient and wear rate of the addition of 0.12 wt% BP/Fe 3 O 4 are reduced 65% and 78%, respectively. To elucidate the excellent tribological mechanisms of BP/Fe 3 O 4 as additives in soybean oil, the compositional and structural characterisation of the abrasion mark surface was studied accordingly. On the one hand, soybean oil reacts with BP/Fe 3 O 4 to form a composite tribo-film during the scraping process. This tribo-film composed of amorphous carbon, iron oxide and phosphorus oxide nitrides prevents direct contact between the sliding interfaces. On the other hand, BP and Fe 3 O 4 nanoparticles form a mechanical rollerball structure, which can further reduce interfacial friction and wear through synergistic lubrication. The results provide new insights into the design of additives in biomass lubricating oils and propose new application prospects for BP in the field of lubricating additives.
研究领域:
材料科学
·
摩擦学
·
生物质润滑剂
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）