Molecular Catalysis
·
2021
·
IF 5.062
Bowei Shen,Farong Zhang,Mengqi Zhao,Zhiquan Pan,Qingrong Cheng,Hong Zhou
The magnetic solid acid, Fe 3 O 4 @PEI@SO 3 H, was synthesized and used as a catalyst to transfer steroid saponins into diosgenin in an alcoholysis approach. The results showed that the magnetic solid acid greatly improved the alcoholysis efficiency for extraction diosgenin from steriod saponins. To optimize the parameters for alcoholysis, such as the mass of the solid acid, solvent volume, the reaction temperature and time, single factor experiments as well as response surface experiment have been performed. Under the optimal conditions, the diosgenin yield obtained by alcoholysis is higher than that of the traditional inorganic acid hydrolysis. And it worth to mention that no waste liquid is discharged. The catalyst is very stable and can be used for three times without obvious mass loss and activity decrease, indicating that the technology of extracting diosgenin from Dioscorea zingiberensis C.H. Wright tuber has a broad prospect in industrial application.
研究领域:
生物化学
·
有机合成
·
制药工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Jianan Cui,Tingting Liu,Qian Zhang,Ting Wang,Xiaohong Hou
Various metal-based heterogeneous catalysts activated peroxymonosulfate for organic pollutants degradation are increasingly recognized as an environmentally important sewage treatment technology. In this study, polyvinyl pyrrolidone (PVP) modified Fe 3 O 4 loaded ZIF-67 magnetic catalyst with transition metal cobalt ion was prepared for the first time by microwave-assisted solvothermal (MS) method within 30 min to activate peroxymonosulfate. The microwave synthesis process changed the time-consuming shortcoming of conventional method. The catalytic activity of the synthesized Fe 3 O 4 -PVP@ZIF-67 was assessed on bisphenol F (BPF) removal. The result showed 99.8% BPF was removed under the conditions of catalyst content of 0.15 g·L −1 , PMS content of 0.3 mM, and pH without adjustment in 60 min. And the Fe 3 O 4 -PVP@ZIF-67/PMS system exhibited a quality catalytic performance when the solution pH of BPF varied from 3 to 11. Compared with humic acid (HA), inorganic anions (Cl − , H 2 PO 4 − , SO 4 2− , HCO 3 − , and CO 3 2− ) showed slight effect to the degradation system. The quenching experiment verified that the main active substance in this system was SO 4 − •. Based on the degradation intermediates identified by gas chromatography-mass spectrometer (GC–MS), the main degradation pathways were proposed for the degradation of BPF. Overall, Fe 3 O 4 -PVP@ZIF-67 as PMS activator is promising catalyst for sulfate radical-based wastewater treatment.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 13
·10310-10318
·
IF 4.6
Rui Wu,Xi Song,Yulin Wang,Qiang Zhang
Considering that pesticide residues cause significant harm to health and the environment, it is crucial and urgent to fabricate surface-enhanced Raman scattering (SERS) substrates with high sensitivity to detect pesticide residues. In this study, a three-layer structure of multifunctional Fe3O4/GO/Ag nanoparticles (NPs) as an active substrate for SERS was fabricated and comprehensively characterized through X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), elemental mapping, and X-ray photoelectron spectroscopy (XPS). The active substrate was used to detect thiram pesticide through SERS. Combined with the synergistic effect, Ag NPs and graphene oxide (GO) possessed high-density and ordered hot spots to enhance the electromagnetic field; therefore, signal amplification and fascinating sensitivity were achieved. The lowest concentration of thiram for clear presentation of the peak was 10−12 mol L−1. There was a satisfactory linear relationship, ranging from 10−10 to 10−4 mol L−1, with a low limit of detection, high sensitivity, satisfactory enhancement factor (EF), stability, and repeatability. In addition, Fe3O4/GO/Ag was successfully applied to identify pesticide residues in a practical sample. Furthermore, the enhancement mechanism, including electromagnetic enhancement and chemical reinforcement, is discussed in detail. Fe3O4/GO/Ag is a potential active substrate for SERS and can be applied for rapid detection in the food industry, environmental fields and biomedicine with fascinating sensitivity.
研究领域:
环境科学
·
食品科学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaoyan Wu,Du Sun,Mi Li,Xiaowen Zhang,Naif Abdullah Al-Dhabi,Qi Fang,Wangwang Tang,Qiuyang Tang,Jie Kou,Ziyin Wang,Xue Zhang,Yilong Hua,Tao Cai
Microbial fuel cells (MFCs) have gained increasing attention in the field of uranium-containing wastewater (UCW) treatment as a self-powered bioelectrochemical system (BES) due to its advantages of recovering uranium resources and generating electricity. However, the lack of catalytic active sites on the carbon fiber cathode significantly hinders the reaction performance of surface electrons with uranium ions in solution, thereby limiting the application of MFC. In this study, we propose a carbon brush (CB) cathode modification process that utilizes cyclic voltammetry synthesis technique (CVS) to polymerize aniline (PA) on the surface of carbon fibers and uniformly load nano-Fe 3 O 4 particles (nFe 3 O 4 ). The loading of PA/nFe 3 O 4 not only significantly improve the catalytic active sites but also enhance the synergistic effect of adsorption and conductivity of CB cathode. Consequently, the nFe 3 O 4 /PA/CB-MFC showed excellent ability to continuous power generation and uranium separation. Over eight cycles of uranium separation, the nFe 3 O 4 /PA/CB-MFC exhibited an average maximum power density of 15.17 mW/m 2 and a uranium separation efficiency of 95.52 %, showcasing substantial enhancements by 2.10-fold and 1.44-fold compared to the CB-MFC, respectively. Our study presents an efficient approach to enhance the efficiency of uranium separation and boost power density of MFC by increase catalytic active sites on carbon-based cathode.
研究领域:
环境科学
·
生物工程
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Li Guo,Kai Lai Zhang,Huidong Shen,Chan Wang,Qiang Zhao,Danjun Wang,Feng Fu,Yucang Liang
Exploiting highly efficient and stable photocatalysts for treating Cr(VI)-containing wastewater is of great importance. Herein, a robust core-shell structurally magnetic Fe 3 O 4 @SiO 2 /Bi 2 WO 6−x F 2x photocatalyst was successfully fabricated and used to photocatalytic Cr(VI) reduction, in which an inert protective layer (SiO 2 )-coated micro/nanostructured Fe 3 O 4 particles can not only improve the chemical stability but also retain magnetic advantage of catalyst. The optimized 55% Fe 3 O 4 @SiO 2 /Bi 2 WO 6− x F 2 x exhibited the highest catalytic activity in a reaction system of pH = 3, the apparent rate constant (k app /min −1 ) of 55% Fe 3 O 4 @SiO 2 /Bi 2 WO 6−x F 2x for photocatalytic reduction of Cr(VI), as high as 0.027 min −1 , is approximately 5.4 and 2.6 times higher than that of Bi 2 WO 6 and Fe 3 O 4 @SiO 2 /Bi 2 WO 6 , respectively. After being illuminated for 90 min, nearly 100% percentage of Cr(VI) has been reduced to Cr(III) by using 55% Fe 3 O 4 @SiO 2 /Bi 2 WO 6−x F 2x as photocatalyst, which can be attributed to the synergistic effect of magnetic Fe 3 O 4 @SiO 2 support – “core”, Bi 2 WO 6 – “shell” and the successful introduction of F − ions. A readily magnetic separation of Fe 3 O 4 @SiO 2 /Bi 2 WO 6−x F 2x catalyst enabled it to reuse conveniently for practical industry application. Finally, the enhanced photocatalytic mechanism of catalyst was proposed for Cr(VI) reduction. The present study not only provides a new mean to solve the recovery of the Bi 2 WO 6 -based photocatalyst, but also presents a promising candidate for Cr(VI) reduction in the field of the industrial wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Chunli Zhang,Yi He,Fei Li,Haihui Di,Lei Zhang,Yingqing Zhan
A novel hybrid materials Fe 3 O 4 nanoparticles supported by hexagonal boron nitride (h-BN) is successfully prepared via mussel-inspired chemistry of dopamine by hydrothermal synthesis method. The surface modification and microstructure of h-BN-Fe 3 O 4 are characterized by FT-IR, XRD , XPS, SEM and TEM . The nano-Fe 3 O 4 obtain well dispersion supported by h-BN layer platform, and the h-BN-Fe 3 O 4 hybrid materials exhibit a remarkable superiority in enhancing the anticorrosion performance of epoxy coatings. The lamellar structural h-BN and nano-Fe 3 O 4 provide a significant synergistic effect in anticorrosion performance for epoxy composite coatings . In addition, the anticorrosion mechanisms of h-BN-Fe 3 O 4 are tentatively discussed.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 6
·4111-4118
·
IF 1.556
Song Lina,Zang Fengchao,Song Mengjie,Chen Gong,Zhang Yu,Gu. Ning
In this strategy, a magnetic fluid of the Fe3O4 nanomicelles was synthesized with amphiphilic PEGylated phospholipid as surfactant and soybean oil as stabilizer under simple mechanical stirring and subsequent ultrasonication. Transmission electron microscope (TEM)
measurement indicated that the sample is monodisperse spherical Fe3O4 nanoparticles with internal core size of 9 nm and external nanomicelle shell thickness of 1.5 nm. The final hydrodynamic size of the sample is 19.5 nm and its zeta potential is −38.5 mV, suggesting
good stability of the magnetic nanomicelles in water. To assess the ability of magnetic nanomicelles to escape reticuloendothelial system (RES) uptake, in vitro cell phagocytosis experiments were conducted using murine macrophages (RAW264.7). The results indicated that the PEGylation
can effectively prevent the uptake of the nanomicelles by the macrophages. Using a mouse model of 4T1 breast cancer, the nanomicelles provided a good magnetic resonance imaging (MRI) capability to sensitively detect tumor by enhanced permeability and retention (EPR) effect. The PEGylated monodisperse
magnetic nanomicelles would become a potential contrast agent for passive targeting diagnosis of tumor by MR imaging.
研究领域:
纳米技术
·
医学成像
·
癌症研究
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Jiangkun Du,Jianguo Bao,Ying Liu,Sang Hoon Kim,Dionysios D. Dionysiou
Metal oxides are potentially interesting catalysts for activating peroxymonosulfate (PMS) for the degradation of recalcitrant contaminants. This study presents a magnetic porous Mn-Fe binary oxide (p-Mn/Fe 3 O 4 ) in micron-size with abundant micro- and meso- pores. This novel catalyst exhibited high efficacy and long-term stability in activating PMS for degradation of bisphenol A (BPA). Sulfate radicals and hydroxyl radicals were identified from catalytic PMS activation according to electron paramagnetic resonance (EPR) characterization. The effects of Fe/Mn ratio, catalyst dose, initial pH and temperature were investigated. Compared to monometallic oxides, p-Mn/Fe 3 O 4 exhibited a better catalytic performance because of the significant synergy between Mn and Fe species. Several BPA intermediates were identified. On the basis of bio-toxicity assay and TOC measurements, BPA transformed to some toxic intermediates during the initial reaction stage, and then decomposed efficiently to low toxicity products and mineralized to carbon dioxide and water molecules. This study shows that p-Mn/Fe 3 O 4 is an efficient and environmentally benign catalyst for PMS oxidation of organic pollutants.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2020
·Vol. 53
·期 24
·245401
·
IF 3.169
Jingyi Xue,Xiaolei Li,Qianli Li,Jiahong Lyu,Wei Wang,Lin Zhuang,Yue Xu
A novel magnetic drug-loaded osteoinductive Fe3O4/CaCO3 hybrid microspheres system (MDHMs) with excellent drug delivery property has been fabricated by a modified coprecipitation method. The MDHMs are uniform vaterite microspheres with well-defined mesoporous nanostructures. The formation of vaterite is based on the templating effect of casein micelles, which is promising in bone tissue engineering. Cyclodextrins (CDs) increase the porosity of the microspheres with a pore size of about 7.3 nm and a surface area of about 50.73 m2 g−1. The mesoporous structure gives the MDHMs great drug loading efficiency of about 80.75–88.74% and the minocycline-loaded MDHMs display a sustained drug release property (about 95% in 5 d). Moreover, the MDHMs also possess stable magnetic property with a saturation magnetization of about 4.41 emu g−1 and a remarkable magnetism-responsive behavior. These results demonstrate that with superior drug delivery property, osteoinductive potential and magnetic property, the MDHMs have a great potential in the treatment of peri-implantitis.
研究领域:
材料科学
·
药剂学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Qunling Fang,Jing Wang,ShanShan Wu,Ken Cham-Fai Leung,Yunqi Xu,Shouhu Xuan
Pathogenic bacteria and difficult-to-degrade pollutants in water have been serious problems that always plague people. Therefore, finding a “one stone-two birds” method that can quickly catalyze the degradation of pollutants and show effective antibacterial behavior become an urgent requirement. This work reports a facile one-step strategy for fabricating a Rambutan-like Fe 3 O 4 @AgAu@PDA (Fe 3 O 4 @AgAu@Polydopamine) core/shell nanosphere with both catalytic and antibacterial activities which can be critically improved by externally applying an NIR laser irradiation (NIR, 808 nm) and a rotating magnetic field. Typically, the Rambutan-like Fe 3 O 4 @AgAu@PDA nanosphere have a rather rough surface due to the AuAg bimetallic nanorods sandwiched between the Fe 3 O 4 core and the PDA shell. Owing to the penetrated PDA shell, AgAu nanorods show high and magnetically recyclable photothermal-enhanced catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol and they can also be applied to initiate TMB oxidation under the help of NIR heating condition. Moreover, Fe 3 O 4 @AgAu@PDA shows a moderate antibacterial activity due to the weak release of Ag + . Under applying a rotating external magnetic field, the rough-surface Fe 3 O 4 @AgAu@PDA nanospheres produce a controllable magnetolytic force on the bacterial due to their good affinity. As a result, the Fe 3 O 4 @AgAu@PDA nanospheres show a "magnetolytic-photothermal-Ag + " synergistic antibacterial behavior against E. coli and S. aureus .
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 已验证
DOI
高影响因子
Chinese Physics B
·
2016
·Vol. 25
·期 8
·088201
·
IF 1.436
Chao Li,Jun-Jie Sun,Duo Chen,Guang-Bing Han,Shu-Yun Yu,Shi-Shou Kang,Liang-Mo Mei
A facile step-by-step approach is developed for synthesizing the high-efficiency and magnetic recyclable Fe3O4@SiO2@Ag@Ni trepang-like nanocomposites. This method involves coating Fe2O3 nanorods with a uniform silica layer, reduction in 10% H2/Ar atmosphere to transform the Fe2O3 into magnetic Fe3O4, and finally depositing Ag@Ni core-shell nanoparticles on the L-lysine modified surface of Fe3O4@SiO2 nanorods. The fabricated nanocomposites are further characterized by x-ray diffraction, transmission electron microscopy, scanning electron microscope, Fourier transform infrared spectroscopy, and inductively coupled plasma mass spectroscopy. The Fe3O4@SiO2@Ag@Ni trepang-like nanocomposites exhibit remarkably higher catalytic efficiency than monometallic Fe3O4@SiO2@Ag nanocomposites toward the degradation of Rhodamine B (RhB) at room temperature, and maintain superior catalytic activity even after six cycles. In addition, these samples could be easily separated from the catalytic system by an external magnet and reused, which shows great potential applications in treating waste water.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2013
·
IF 4.612
Xiangfeng Chen,Ning Ding,Hao Zang,Hoisze Yeung,Ru-Song Zhao,Chuange Cheng,Jianhua Liu,T.-W. Dominic Chan
Fe 3 O 4 @MIL-100 core–shell magnetic microspheres were, for the first time, used as the sorbent for the magnetic solid-phase extraction (MSPE) of polychlorinated biphenyls at trace levels in environmental water samples. GC coupled with tandem MS was used for sample quantification and detection. The Box–Behnken design was used to determine the optimum extraction parameters influencing extraction efficiency through response surface methodology. Under the optimized conditions, the developed method showed good linearity within the range of 5–4000 ng L −1 , low limits of detection (1.07–1.57 ng L −1 ; signal-to-noise ratio = 3:1), and good extraction repeatability (relative standard deviation < 12%; n = 5). Environmental samples collected from the Yellow River, local lake, wastewater, and snow water were processed using the developed method. The results demonstrated that the Fe 3 O 4 @MOF core–shell magnetic microspheres are promising sorbents in the MSPE of aromatic pollutants from environmental water samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）