RSC Advances
·
2016
·Vol. 6
·期 113
·112232-112240
·
IF 3.289
Xiangjie Luo,Ying Wang,Huiming Lin,Fengyu Qu
The integration of multiple therapies into one nanoplatform was considered to be the most efficient method to give an enhanced therapeutic effect for anti-cancer treatments. In this research, pH sensitive drug release and near-infrared (NIR)-induced photothermal therapy (PTT) were placed in one nanocomposite using iron(II,III) oxide@meso-silica (Fe3O4@mSiO2) NPs as the host. Then, a sensitive ketal modified silane coupling agent (PO linker) was prepared to encapsulate the anti-cancer drug, doxorubicin hydrochloride (DOX), into the mSiO2 shell, ensuring the few leakage. Based on the different pH conditions of normal and cancer cells, the DOX-Fe3O4@mSiO2-PO nanocomposite exhibits the specific drug release in cancer cells (acid conditions) before that the few leakage makes sure there are a low number of side effects. Furthermore, the release kinetics can also be easily adjusted by varying the amount of PO linker. Under NIR (808 nm) irradiation, the photothermal effect derived from magnetic Fe3O4 NPs can also induce the apoptosis of the cancer cells which is how PTT is achieved. HeLa cells (cervical cancer cell line) were used as the typical cancer cell and the detailed cell experiments further display the enhanced specific cytotoxicity of the method to HeLa cells. The multifunctional nanocomposite has great potential as an application for anti-cancer therapy.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2017
·
IF 6.216
Shumin Zhu,Bingzhi Dong,Yanghai Yu,Lingjun Bu,Jing Deng,Shiqing Zhou
Ordered mesoporous Fe 3 O 4 catalyst was successfully fabricated using KIT-6 as the hard template through a nanocasting route and innovatively investigated as a heterogeneous ozonation catalyst. The morphology and physico-chemical properties of as-prepared catalysts were characterized by X-way diffraction, Fourier transform infrared, transmission electron microscopy, X-ray photoelectron spectroscopy and N 2 adsorption-desorption techniques. Results showed that the surface area and average pore size of mesoporous Fe 3 O 4 were 154.2 m 2 g −1 and 6.2 nm, respectively. The mesoporous Fe 3 O 4 catalyst presented superior catalytic activity for removing atrazine (ATZ) during ozonation compared to conventional Fe 3 O 4 nanoparticles. The contribution of homogeneous ozonation reaction catalyzed by leaching irons was negligible, suggesting that the degradation of ATZ was mainly dominated by heterogeneous reaction catalyzed by mesoporous Fe 3 O 4 . Moreover, the removal rate of ATZ increased with the increase of catalyst dosage and solution pH. Based on the results of XPS analysis and radical scavenging test, a plausible mechanism was proposed. The redox cycles of Fe 2+ /Fe 3+ was responsible for hydroxyl radical (OH ) generation and OH dominantly contributed to the degradation of ATZ in this study. Finally, the possible transformation pathways of ATZ degradation were proposed and the toxicity of degradation products was evaluated. The results demonstrated that ordered mesoporous Fe 3 O 4 is a promising catalyst for ozonation process, especially treating water polluted by ozone-resistant contaminants.
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JOURNAL OF NANOPARTICLE RESEARCH
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2017
·Vol. 19
·期 7
·1-8
·
IF 2.02
Han Jishu,Sun Xiaoxia,Zhao Ruiyang,Gao Hongtao,Wang Lei
Degradation of hazardous organic dyes utilizing multifunctional catalytic materials is supposed to be an efficient and promising method. Here, homogeneous Cu-Fe 3 O 4 nanocomposites are synthesized through a facile and versatile one-pot hydrothermal method. The prepared Cu-Fe 3 O 4 possesses spherical structure with rough surface and average diameter of 230 nm. High catalytic activity and structure stability make Cu-Fe 3 O 4 nanocomposites effectively degrade rhodamine B, methylene blue, methyl orange, and congo red. The existence of magnetic Fe 3 O 4 leads the nanocomposites to separate from the solution through external magnet and reuse for cycle degradation. And during the cyclic utilization, Cu-Fe 3 O 4 nanocomposites keep high catalytic activity and, thus, could be used as an efficient degradation catalyst for the application of organic dyes.
Graphical abstract
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ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Lin Miao,Yi-Zhou Zhu,He-Fang Wang
We presented the first exploration of the easily prepared nickel-decorated magnetic Fe3O4 nanoparticles as recyclable nanosized magnetic self-stirring catalysts for microdroplet reactions. The cross-linked polymer poly(cyclotriphosphazene-co-4,4′-sulfonyldiphenol) (PZS) was used as the intermediary to link Fe3O4 and anchored nickel nanodots. On the basis of the charming magnetic feathers of Fe3O4 and the fine catalysis activity of Ni, the Fe3O4@PZS-Ni nanoparticles could not only self-stir or make the reactants move along the tiny channels with the help of the external rotating magnetic field but also exhibit high catalysis activity and convenient recyclability. The Fe3O4@PZS-Ni nanoparticles have the merits of small size, good suspension, easy fabrication, and most importantly, superior flexibility and adaptability to any shape of the microreactors or nanoreactors; thus, they may bring new inspiration for self-stirring catalytic reactions in micro/nanochips or micro/nanobiological tubules or tissues.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2017
·
IF 4.9
Naling Bai,Sheng Wang,Pengfei Sun,Rexiding Abuduaini,Xufen Zhu,Yuhua Zhao
In this study, the efficiency of the nonylphenol polyethoxylates (NPEOs)-degrading bacterium Sphingomonas sp. strain Y2 was evaluated, which was immobilized by a novel system composed of polydopamine (PD)-coated Fe 3 O 4 iron nanoparticles (IONPs). The PD-IONPs, with a distinct core-shell structure, relatively uniform size, and high saturation magnetization, were prepared for Y2 immobilization. The performance of Y2 was unaffected by this novel immobilization method, exhibiting 79.5% and 99.9% of NPEOs (500 ppm) degradation efficiency at day 1 and 2, respectively. Furthermore, separation and recycling were more readily achieved for immobilized cells as compared to free cells. Immobilized cells retained over 70% of the original degradation activity after 6 cycles of utilization. These results suggest that Y2-PD-IONPs can be potentially used for NPEOs-contaminated wastewater bioremediation. Capsule Immobilization of Sphingomonas sp. Y2 by functionalized PD-IONPs with easy separation, recycling utilization and high efficiency.
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PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
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2017
·Vol. 44
·期 1
·1-11
·
IF 1.369
Yan Xuefeng,Gan Kaifeng,Tian Baozhu,Zhang Jinlong,Wang Lingzhi,Lu Deli
A yolk–shell-structured sphere composed of a superparamagnetic Fe 3 O 4 core and a carbon shell (Fe 3 O 4 @HCS) was etched from Fe 3 O 4 @SiO 2 @carbon by NaOH, which was synthesized through the layer-by-layer coating of Fe 3 O 4 . This yolk–shell composite has a shell thickness of ca. 27 nm and a high specific surface area of 213.2 m 2 g −1 . Its performance for the magnetic removal of tetracycline hydrochloride from water was systematically examined. A high equilibrium adsorption capacity of ca. 49.0 mg g −1 was determined. Moreover, the adsorbent can be regenerated within 10 min through a photo-Fenton reaction. A stable adsorption capacity of 44.3 mg g −1 with a fluctuation <10% is preserved after 5 consecutive adsorption–degradation cycles, demonstrating its promising application potential in the decontamination of sewage water polluted by antibiotics.
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ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Linglin Zhou,Guilong Zhang,Jie Tian,Dongfang Wang,Dongqing Cai,Zhengyan Wu
Core–shell magnetic Fe3O4@C nanospheres functionalized with active chemical groups were synthesized via a one-step template-free solvothermal process and employed to remove hexavalent chromium (Cr(VI)) in aqueous media. The structure of Fe3O4@C nanoparticles could be effectively adjusted by the concentration of precursor. The Fe3O4 core possessed a high magnetism for the convenient separation of Fe3O4@C from aqueous solution, and high porosity and abundant functional groups (−OH, −COOH, and C═C) of carbon layer contributed to a superior performance on Cr(VI) removal. Therein, Cr(VI) ions could be efficiently adsorbed into the carbon layer and reduced to trivalent chromium (Cr(III)) mainly by C═C, and the resulting Cr(III) were chelated by the −COOH group. Noteworthy, the carbon layer thickness, pore size, and amount of chemical groups significantly increased with the increase of Fe3O4@C particle size resulting in a rising removal efficiency on Cr(VI). This study provides a promising approach for removing Cr(VI) and may have a huge application potential.
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高影响因子
MATERIALS LETTERS
·
2014
·
IF 2.269
Ling Li,Ke Ke Sun,Lu Fan,Wei Hong,Zu Shun Xu,Li Liu
Magnetic core–shell spheres Fe 3 O 4 @MOFs and Fe 3 O 4 @MOFs/GO were prepared using layer by layer assembly method. Fe 3 O 4 @MOFs and Fe 3 O 4 @MOFs/GO were characterized by XRD , FTIR, SEM, TEM and VSM. The results showed that both magnetic spheres were with core–shell structure. The method was proved to be valuable for producing core–shell structure with porous nanocomposite materials as shell. Methylene blue was selected as drug model to study the drug loading of the synthesized spheres. It was found that the addition of graphene oxide (GO) enhanced the drug loading amount of magnetic sphere.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2013
·
IF 2.39
Zhongshan Ren,Xiaojun Hu,Xiangxin Xue,Kuochih Chou
The solid state reactions in Fe 3 O 4 –TiO 2 system has been studied by diffusion couple experiments at 1323–1473 K, in which the oxygen partial pressure was controlled by the CO–CO 2 gas mixture. The XRD analysis was used to confirm the phases of the inter-compound, and the concentration profiles were determined by electron probe microanalysis (EPMA). Based on the concentration profile of Ti, the inter-diffusion coefficients in Fe 3 O 4 phase, which were both temperature and concentration of Ti ions dependent, were calculated by the modified Boltzmann–Matano method. According to the relation between the thickness of diffusion layer and temperature, the diffusion coefficient of the Fe 3 O 4 –TiO 2 system was obtained. According to the Arrhenius equation, the estimated diffusion activation energy was about 282.1 ± 18.8 kJ mol −1 .
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2013
·
IF 1.913
Dan Wang,Ping Yang,Yuanna Zhu
Fe 3 O 4 nanoparticles (NPs) have been synthesized by the thermal decomposition of iron oleate complex in 1-octadecene solutions using organic amines as stabilizers such as trioctylamine (TOA), oleylamine (OAm), and hexadecylamine (HDA). By optimizing preparation conditions such as temperature, time, and the concentration of reaction reagents, the NPs exhibited adjusted sizes and morphologies (spherical, truncated octahedral, cubic, and tetrahedral). Organic amines play an important role for the morphology of the NPs. For example, truncated octahedral shape was gradually changed into quasi-cubic shape if adding TOA in the reaction system for a long time. In contrast, spherical, cubic, and tetrahedral Fe 3 O 4 NPs were fabricated in the case of OAm used. Because of OAm used as a reducing agent, reaction temperature was decreased. HDA resulted in spherical Fe 3 O 4 NPs a large size. It is confirmed that organic amine molecules were bound on the surface of the NPs by measuring the Fourier transformation infrared spectroscopy of samples.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Xin Jiang,Hai-Yu Chen,Ling-Li Liu,Ling-Guang Qiu,Xia Jiang
Well dispersed Fe 3 O 4 embedded ZIF-8 nanocrystals were synthesized through a facile co-precipitation approach. Brunauer–Emmett–Teller (BET) and magnetic hysteresis loop analysis revealed that the hybrid nanoparticles with large surface areas exhibited good magnetic properties. The magnetic Fe 3 O 4 /ZIF-8 nanocomposites were used to remove hydroquinone (HQ) from aqueous solution. HQ adsorption kinetics followed the pseudo-second-order, and the equilibrations were established between 100 and 200 min. The adsorption isotherms of the nanocomposites could be described very well by the Langmuir equation with ultra-high maximum adsorption capacity of 2527 mg g −1 . Besides, the used Fe 3 O 4 /ZIF-8 could be conveniently regenerated by washing with methanol, and the regeneration efficiency could remain 90% after 3 cycles of regeneration. Along with the magnetic separation ability, the as-prepared Fe 3 O 4 /ZIF-8 nanocomposites might be promising candidate for efficient wastewater purification.
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RSC Advances
·
2017
·Vol. 7
·期 30
·18466-18479
·
IF 3.108
Chao Zhou,He Zhu,Qin Wang,Junxiu Wang,Juan Cheng,Yongfu Guo,Xiaoji Zhou,Renbi Bai
To enhance the ability to remove mercury(II) from aqueous media, an Fe3O4 magnetic nanocomposite (PPy–GO) composed of polypyrrole (PPy) and graphene oxide (GO) was synthesized in situ and characterized via scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), X-ray photoelectron spectrometry (XPS), X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR), zeta potential analysis, vibrating sample magnetometer (VSM) and the Brunauer–Emmett–Teller (BET) method. The performance of the magnetic PPy–GO for adsorbing mercury(II) from water along with the effects of solution pH, adsorbent dosage, coexisting ions, reaction time and temperature were studied in detail. The adsorption kinetics, isotherms and thermodynamics were investigated in detail to gain insights into the adsorption process. The results show that the BET surface area of the magnetic PPy–GO reached 1737.6 m2 g−1. The Langmuir capacity of the magnetic PPy–GO for mercury(II) adsorption was 400.0 mg g−1 at 300 K and pH 7 ± 0.1. After adsorption, the magnetic PPy–GO nanocomposite could be efficiently separated from water via a magnetic field. The adsorption process was endothermic and spontaneous and occurred in accord with the Langmuir and pseudo-second-order models. The overall adsorption of mercury(II) not only involved chemisorption, but was also partially governed by intra-particle diffusion. Data from the preliminary application of magnetic PPy–GO to remove heavy metals from real electroplating effluent indicated a high removal efficiency of over 99% for mercury(II). Finally, a possible adsorption mechanism was discussed. All data showed that the magnetic PPy–GO material is a promising adsorbent to remove mercury(II) from aqueous media.
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