ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2016
·Vol. 23
·期 15
·15218-15226
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IF 2.76
Yue Xinxin,Guo Weilin,Li Xianghui,Zhou Haihong,Wang Ruiqin
In this study, a novel core-shell Fe 3 O 4 @MIL-101 (MIL stands for Materials of Institute Lavoisier) composite was successfully synthesized by hydrothermal method and was fully characterized by X-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectra, and X-ray photoelectron spectroscopy. The composite was introduced as a catalyst to generate powerful radicals from persulfate for the removal of Acid Orange 7 in an aqueous solution. Effects of the central metal ions of MIL-101, amino group content of MIL-101, and pH were evaluated in batch experiments. It was found that both hydroxyl and sulfate radicals were generated; importantly, sulfate radicals were speculated to serve as the dominant active species in the catalytic oxidation of Acid Orange 7. In addition, a possible mechanism was proposed. This study provides new physical insights for the rational design of advanced metal-organic frameworks (MOF)-based catalysts for improved environmental remediation.
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Journal of Materials Chemistry B
·
2016
·Vol. 4
·期 21
·3660-3669
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IF 4.872
Ling Chen,Lin Wu,Fei Liu,Xueyong Qi,Yanru Ge,Song Shen
To improve the therapeutic effect and decrease the toxicity in normal tissues, stimuli-responsive drug delivery systems have attracted extensive attention in tumor therapy. In this work, we present a smart drug delivery system based on the stimulated decomposition of a thermo-sensitive molecule, azobis[N-(2-carboxyethyl)-2-methylpropionamidine] (Azo), for the combined photothermal therapy and chemotherapy. Doxorubicin (DOX) was attached to the surface of magnetic nanoparticles (NPs) via the Azo linker. Upon irradiation with near infrared (NIR) light, local heating is generated by iron oxide nanoparticles (IONPs), which triggers the decomposition of the Azo molecule and the release of DOX. Compared with Fe3O4–DOX NPs, Fe3O4–Azo–DOX NPs demonstrate dominant advantages of stability, which results in the low toxicity of Fe3O4–Azo–DOX NPs in cardiac tissues. Fe3O4–Azo NPs display excellent photothermal effects under NIR laser irradiation and extremely low cytotoxicity towards MCF-7 cells. Furthermore, the Fe3O4–Azo–DOX NP system exhibits significantly enhanced cell killing effects upon irradiation with NIR, attributed to the synergistic therapeutic efficacy of photothermal chemotherapy.
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Journal of Materials Chemistry B
·
2017
·Vol. 5
·期 22
·4221-4232
·
IF 4.543
Yeying Wang,Xijian Liu,Guoying Deng,Qian Wang,Lijuan Zhang,Qiugen Wang,Jie Lu
In this work, multifunctional polystyrene@chitosan@gold nanoparticles–Fe3O4 nanoparticles–folic acid/indocyanine green (PS@CS@Au–Fe3O4–FA/ICG) nanocomposites that can integrate diagnosis and therapy into one nanoplatform was fabricated. The constructed PS@CS@Au–Fe3O4–FA/ICG nanocomposites possessed excellent computed tomography, magnetic resonance and fluorescence imaging performances which could be used to diagnose tumor and monitor the nanocomposites’ localization in vivo. Moreover, PS@CS@Au–Fe3O4–FA/ICG nanocomposites can be delivered in a targeted manner to cancer cells by folic acid in a receptor-mediated way, and tumor growth could be efficiently inhibited, even completely ablated, under NIR irradiation. That is, the constructed PS@CS@Au–Fe3O4–FA/ICG nanocomposites had great potential for computed tomography, magnetic resonance and fluorescence imaging performances, which could be used to diagnose tumors and to monitor local therapy and fluorescence imaging-guided targeted therapy of cancer cells using nanocomposites.
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RSC Advances
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2017
·Vol. 7
·期 39
·24453-24461
·
IF 3.108
Chaocheng Zhao,Pei Dong,Zongmei Liu,Guangrui Wu,Shuaijun Wang,Yongqiang Wang,Fang Liu
An active Fe3O4/MIL-101 hybrid material was prepared via a simple in situ solvothermal method and characterized as a heterogeneous Fenton-like catalyst for Rhodamine B (RhB) degradation. The Fe3O4/MIL-101 exhibited enhanced catalytic performance for RhB degradation in a neutral solution. Under optimized conditions, almost 100% removal of 10 mg L−1 RhB was achieved in 30 min using 0.5 g L−1 Fe3O4/MIL-101 and 20 mM H2O2 at initial pH 7. The reusability of Fe3O4/MIL-101 was also investigated after four runs. On the basis of the characterization of the catalyst, the results of metal leaching, the effects of radical scavengers, and hydroxyl radical (˙OH) determination, it was concluded that RhB is decomposed mainly by the attack of the hydroxyl radical (˙OH), generated by the reaction of Fe2+ species with H2O2. MIL-101 showed a significant synergistic effect with Fe3O4, in which it played the role of a solid-acid catalyst with Lewis acid sites on its surface, ensuring that a Fenton-like reaction occurred in the neutral solution.
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CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Ting Wang,Pan Zhao,Nan Lu,Hongche Chen,Conglu Zhang,Xiaohong Hou
Attractive magnetic metal-organic framework (MOF) material Fe 3 O 4 /MIL-101(Cr) (Matérial Institute Lavoisier, MIL) was synthesized by a simple reduction–precipitation method, and applied as an effective sorbent to the removal of two acid dyes, acid red 1 (AR1) and orange G (OG), in water. The novel synthetic method avoided the oxidation of Fe 2+ and made the Fe 3 O 4 /MIL-101(Cr) composite have the advantages of strong magnetism, large surface areas and excellent dispersion effect. Parameters that influenced the adsorption process, such as solution pH, adsorbent dosage, ionic strength, and so on, were investigated. Under the optimum conditions, adsorption kinetics and isotherms were determined from the obtained experimental data. The adsorption kinetics suggested the adsorption process of Fe 3 O 4 /MIL-101(Cr) toward AR1 and OG met the pseudo-second-order kinetic model. The adsorption isotherms were fitted by Langmuir, Freundlich and Dubinin–Radushkevich (D–R) isotherm models. Compared with the Freundlich and D–R models, the Langmuir isotherm model was found to be suitable to describe the equilibrium data, suggesting that the uptake of AR1 and OG by the Fe 3 O 4 /MIL-101(Cr) would be through monolayer adsorption. The thermodynamic results demonstrated that the adsorption was a spontaneous, exothermic and entropy decreased process. In addition, the Zeta potential data with pH value of AR1 and OG indicated that the electrostatic interactions between the dyes and the adsorbent might be critical to the adsorption mechanism. The used Fe 3 O 4 /MIL-101(Cr) could be regenerated by washing with NaOH solution and reused at least six times. The maximum adsorption capacities of the magnetic composite toward AR1 and OG were up to 142.9 mg g −1 and 200.0 mg g −1 , respectively. These results demonstrated that the novel composite would be an effective and easily re-usable adsorbent for AR1 and OG.
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CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Jianhui Zhao,Jie Liu,Ning Li,Wei Wang,Jun Nan,Zhiwei Zhao,Fuyi Cui
In this study, magnetic Fe 3 O 4 -MnO 2 nanoplates were successfully synthesized by a facile hydrothermal process in order to remove bivalent heavy metals from water. The Fe 3 O 4 part facilitated the reclamation of the adsorbent. Meanwhile, the modification by amorphous MnO 2 could significantly enhance the specific surface area of Fe 3 O 4 -MnO 2 and decrease the point of zero charge, thus ensured the good adsorption capacity for metal cations. The adsorption isotherms and kinetics of the five metal ions on Fe 3 O 4 -MnO 2 and the pH effect on removal efficiency were detailedly investigated. Sips isotherm was the most suitable model to describe Pb 2+ , Cu 2+ , Cd 2+ and Zn 2+ adsorption on Fe 3 O 4 -MnO 2 , while Temkin, Redlich-Peterson and Langmuir models showed a higher fitting degree for Ni 2+ . The adsorption capacities of Pb 2+ , Cu 2+ , Cd 2+ , Zn 2+ and Ni 2+ on Fe 3 O 4 -MnO 2 were 208.17, 111.90, 169.90 100.24 and 55.63 mg/g, respectively. Kinetic data were better fitted to pseudo-second-order model ( R 2 > 0.99), indicating a dominant role of chemisorption. Further analysis of infrared spectra demonstrated that the adsorption process was achieved mainly by ion exchange and complexation. The adsorption rates and preference ranking of metal ions on Fe 3 O 4 -MnO 2 were in the same order: Pb 2+ > Cu 2+ > Cd 2+ > Zn 2+ > Ni 2+ . Moreover, the adsorbent showed good recyclability and excellent ability of neutralizing the solutions by surface protonation and deprotonation. Overall, the reported results here have significant implications for removing metal cations from water in practice.
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Molecular Catalysis
·
2017
·
IF 0
Li Wang,Lei Sun,Zebin Yu,Yanping Hou,Zhenbo Peng,Fei Yang,Ying Chen,Jun Huang
The Fe 3 O 4 @SiO 2 -BiOBr (FSB) magnetic composite was prepared and introduced into the dielectric barrier discharge (DBD) system as a heterogeneous Fenton-like photocatalyst for synergistic degradation of perfluorooctanoic acid (PFOA). The FSB was characterized by X-ray diffraction, UV–vis diffuse reflectance spectra, energy dispersive X-ray spectroscopy and scanning electron microscope. Characterization results demonstrated that BiOBr was successfully coated on Fe 3 O 4 @SiO 2 , forming FSB, and it exhibited good UV & visible response. The presence of FSB accelerated PFOA degradation: PFOA removal efficiency and total organic carbon removal from DBD-FSB system increased from 73.5% to 92.9% and 28.9% to 62.5%, respectively, within 60 min under reaction conditions of 20 mg L −1 PFOA, initial pH 4.28, 100 mg L −1 FSB and 22 kV peak voltage, as compared with DBD system. Accordingly, defluorination efficiency of PFOA and energy efficiency increased from 21% to 32.8% and 46.39 mg kW −1 h −1 to 72.47 mg kW −1 h −1 , respectively. The synergetic mechanism was attributed to the combination of active species such as OH, H 2 O 2 , O 3 , directly generated from the DBD plasma and a great amount of OH generated from Fenton-like reaction initiated by FSB photocatalyst under light irradiation emitted during discharge. The OH and photogenerated holes played essential roles in the mineralization process. Based on the identified intermediates, possible degradation pathways of PFOA in DBD-FSB system were proposed, and PFOA degradation mainly occurred via the pathway of perfluoroalkyl radical pathway.
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JOURNAL OF SEPARATION SCIENCE
·
2017
·Vol. 40
·期 10
·2278-2285
·
IF 2.557
Chen Xu,Yingjia Yu,Li Ling,Xueni Sun,Yan Li,Gengli Duan
In this paper, a facile extraction strategy is reported for the analysis of isopentenyl pyrophosphate, a key isoprenoid, based on magnetic core–shell microspheres with Ti 4+ ion exterior walls coupled with liquid chromatography and tandem mass spectrometry. Because of their excellent hydrophilicity and biological compatibility, the polydopamine@Fe 3 O 4 -Ti 4+ microspheres display ideal isopentenyl pyrophosphate extraction efficiency. The technique includes three steps: sample loading, nonphosphate washing, and phosphate elution. Moreover, the microspheres can be regenerated by thorough washing with a specific solvent and can be reused multiple times. The liquid chromatography with tandem mass spectrometry separation was performed on a Welch Ultimate® XB-C 18 column with a total chromatographic analysis time of 5 min; the analytical recovery was 98.52%. The proposed method was used to determine the isopentenyl pyrophosphate concentration in rat plasma samples collected from the Shanghai Chest Hospital. The results indicate the prospective value of the as-made microspheres for the sensitive and selective enrichment of phosphate compounds in complicated matrices.
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WATER RESEARCH
·
2017
·
IF 6.942
Mingjie Huang,Tao Zhou,Xiaohui Wu,Juan Mao
This study demonstrated the efficient degradation of a typical bio-refractory antibiotic norfloxacin (NOR) in a photochemical iron oxides/oxalate system adopting magnetic catalyst (Fe 3 O 4 /UV/Ox). It was found that the in-situ generated HO was the main reactive oxygen species (ROS) but CO 2 – could also participate in the NOR degradation to form formylate organic intermediates. Besides, NOR would be degraded via an interesting pathway comprising an initial lag and a subsequent rapid period, where the former could be eliminated by introducing the pre-dissolution of Fe 3 O 4 particles. Furthermore, specific comparative investigations and surface characterizations of pre-adsorbed Fe 3 O 4 particles had evidenced that the existence of surface-bound iron-Ox complexes would be critical for the heterogeneous photochemical dissolution of Fe 3 O 4 and effectively initiated the subsequent homogeneous-heterogeneous NOR degradation. Finally, a comprehensive distinguishing reaction mechanism was proposed including a homogeneous-heterogeneous iron cycle on the solid-water interface and a series of homogeneous radical reactions. Therein, complexation instead of photochemical reduction would be dominant during the whole dissolution process even under UV irradiation. Rapid electrons exchange would occur photochemically between Fe II and Fe III in the octahedral sites, further weakening the surface Fe-O bonds and accelerating its breakaway from the bulk Fe 3 O 4 structure. This work could distinguish the complex heterogeneous/homogeneous reactions in the photochemical in-situ chemical oxidation systems that utilize naturally abundant iron oxides and polycarboxylic acids.
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DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 7
·2204-2213
·
IF 4.029
Lanfang Ren,Xijian Liu,Qian Wang,Lijuan Zhang,Guoying Deng,Feng Zhou,Jie Lu
In this study, a multifunctional nano-drug (PTX-loaded Cys-Fe3O4/CuS@BSA nanocomposite), which performs well in hydrophobic drug delivery, magnetic resonance imaging (MRI) and chemo-photothermal combination therapy, has been successfully synthesized via a facile method with several biocompatible agents. The characterization verified that our as-obtained nanocarrier has a preferable average diameter of about 300 nm for cancer therapy, shows a great MRI ability and magnetism performance, and exhibits a favorable in vitro and in vivo photothermal therapeutic efficacy by introducing CuS, and the sustained release of chemotherapeutics could be controlled by pH value and near-infrared laser irradiation has further enhanced the therapeutic performance. Overall, the excellent synergistic effect to inhibit tumor growth effectively realized via imaging-guided combinational chemo-photothermal therapy in the present work, highlights the promise of conquering the limitations of tumor treatments.
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Materials Chemistry Frontiers
·
2017
·Vol. 1
·期 6
·1185-1193
·
IF 0
Wei Huang,Xinxin Xiao,Christian Engelbrekt,Minwei Zhang,Shuo Li,Jens Ulstrup,Lijie Ci,Jinkui Feng,Pengchao Si,Qijin Chi
The discovery of new anode materials and engineering their fine structures are the core elements in the development of new-generation lithium ion batteries (LIBs). To this end, we herein report a novel nanostructured composite consisting of approximately 75% Fe3O4 nanorods and 25% reduced graphene oxide (rGO). Microscopy and spectroscopy analyses have identified that the Fe3O4 nanorods are wrapped (or encapsulated) by the rGO nanosheets via covalent bonding, which further self-assemble into a mesoporous hybrid composite networked by the graphene matrix. The composite has an average pore size around 20 nm and exhibits a high surface area of 152 m2 g−1, which is 76 times as high as that of conventional Fe3O4 powder. We have used the composite as an LIB anode material to fabricate coin-type prototype cells with lithium as the cathode. Systematic half-cell testing evaluations show that the electrochemical performance of the present composite material is amongst the best of the transition metal-oxide based LIB anode materials. The performances are characterized by a high reversible capacity of 1053 mA h g−1 subjected to 250 charge–discharge cycles at 500 mA g−1 and an excellent rate capability with the deliverable energy of 788–541 mA h g−1 upon the application of high current densities of 1000–5000 mA g−1. Overall, we have demonstrated that Fe3O4 nanorod–rGO hybrid composite is an interesting and promising material for the fabrication of LIB anodes.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Meimei Xu,Shuai Zhao,Chenglong Lin,Yanyan Li,Weida Zhang,Yusi Peng,Rui Xiao,Zhengren Huang,Yong Yang
Lateral flow immunoassay (LFIA) has been widely used for the early diagnosis of diseases. However, conventional colorimetric LFIA possesses limited sensitivity, and the single-mode readout signal is easily affected by the external environment, leading to insufficient accuracy. Herein, multifunctional Fe3O4@MoS2@Pt nanotags with a unique “pompon mum”-like structure were triumphantly prepared, exhibiting excellent peroxidase (POD)-like activity, photothermal properties, and magnetic separation capability. Furthermore, the Fe3O4@MoS2@Pt nanotags were used to establish dual-mode LFIA (dLFIA) for the first time, enabling the catalytic colorimetric and photothermal dual-mode detection of severe acute respiratory syndrome coronavirus 2 nucleocapsid protein (SARS-CoV-2 NP) and influenza A (H1N1). The calculated limits of detection (cLODs) of SARS-CoV-2 NP and H1N1 were 80 and 20 ng/mL in catalytic colorimetric mode and 10 and 8 ng/mL in photothermal mode, respectively, demonstrating about 100 times more sensitive than the commercial colloidal Au-LFIA strips (1 ng/mL for SARS-CoV-2 NP; 1 μg/mL for H1N1). The recovery rates of dLFIA in simulated nose swab samples were 95.2–103.8% with a coefficient of variance of 2.3–10.1%. These results indicated that the proposed dLFIA platform showed great potential for the rapid diagnosis of respiratory viruses.
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