APPLIED ORGANOMETALLIC CHEMISTRY
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2019
·Vol. 33
·期 5
·e4850
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IF 3.259
Mingliang Ma,Yuying Yang,Yanyan Liu,Wenting Li,Guopeng Chen,Yong Ma,Ping Lyu,Shunhe Li,Yubao Wang,Guanglei Wu
In this paper, a simple route for palladium (Pd) nanoparticles attached to the surface of hollow magnetic Fe 3 O 4 /P (GMA-DVB)-polyethyleneimine (PEI) microspheres was established. Due to the large amount of imidogen groups and tertiary amine groups presenting in the PEI, Pd 2+ ions could be anchored to the support by complexation with a polyfunctional organic ligand. Thereafter, a magnetic Pd catalyst having a high loading amount and good dispersibility was obtained by reducing Pd 2+ ions. Afterwards, the prepared catalyst was characterized by TEM, SEM, FTIR, XRD, TGA, VSM, and UV–vis in detail. Ultimately, their catalytic activity was evaluated using the reduction of 4-nitrophenol (4-NP). Research showed that the Fe 3 O 4 /P (GMA-DVB)-PEI/Pd catalyst possessed high catalytic performances for the reduction of 4-NP with a conversion rate of 98.43% within 540 s. Furthermore, the catalyst could be easily recovered and reused at least for nine successive cycles.
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POLYHEDRON
·
2019
·
IF 2.284
Ning Tian,Yifang Dai,Qing Liu,Wei Dai
A general synthetic strategy for HS-Fe 3 O 4 @MIL-53(Al) adsorbent has been developed in this work. The composite material exhibits an efficient capture performance for rubidium ion due to sulfhydryl group and magnetic Fe 3 O 4 doped in its porous cavity. The results of X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and N 2 adsorption–desorption proved that the HS-Fe 3 O 4 was immobilized in the composite material. High Rb + uptake capacity over the HS-Fe 3 O 4 @MIL-53(Al) is attributed to the exchange of acidic protons between the sulfhydryl group and the Rb + . The pseudo-second-order and Freundlich model could make a good description of the adsorption process. The Rb + sorption selectivity was moderately influenced by any co-ions effect (K + , Na + and Cs + ) due to HS-Fe 3 O 4 doped. These results reveal that our novel composite material might be a promising industrial adsorbent for Rb + capture.
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ENVIRONMENTAL POLLUTION
·
2019
·
IF 5.714
Wanling Cai,Xiulan Weng,Zuliang Chen
Antibiotics in water and soil are persistent, bioaccumulative and toxic to aquatic organisms and human health. To address it, as one of the new technologies , green synthesized magnetic Fe 3 O 4 nanoparticles by Excoecaria cochinchinensis extract used to remove rifampicin (RIF) was investigated in this study. Results showed the adsorption efficiency of RIF reached 98.4% and the maximum adsorption capacity is 84.8 mg/g when 20 mL of RIF at a concentration of 20 M was adsorbed by 10 mg Fe 3 O 4 at a temperature of 303 K. The morphology of the green Fe 3 O 4 characterized by SEM demonstrated the dimensions ranging from 20 to 30 nm. The N 2 adsorption/desorption isotherms revealed that the surface area of Fe 3 O 4 was 111.8 m 2 /g. In addition, adsorption studies indicated that the kinetics fitted the pseudo second-order and isothermal adsorption conformed to the Langmuir isotherm. Furthermore, due to their magnetic properties, the Fe 3 O 4 nanoparticles were easily separated and reused and the mechanism for removing RIF occurred through adsorption rather than chemical redox reaction. Finally, the reusability of Fe 3 O 4 for adsorption of RIF showed that the removal efficiency decreased to 61.5% after five cycles.
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ENERGY CONVERSION AND MANAGEMENT
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2019
·
IF 7.181
Wentao Wang,Malik Muhammad Umair,Jinjing Qiu,Xiaoqiao Fan,Zhihua Cui,Yuyuan Yao,Bingtao Tang
The objective of this study is to develop a novel phase change nanocomposite for efficient electromagnetic and solar energy conversion and storage. The multifunctional nanocomposites are formulated by using PEG/SiO 2 as form-stable phase change material and well-dispersed Fe 3 O 4 -functionalised graphene nanosheets (Fe 3 O 4 -GNS) as energy converter. The magnetothermal effect of Fe 3 O 4 nanoparticles and light harvesting properties of graphene in Fe 3 O 4 -GNS, enabled the efficient magnetic- or light-to-heat conversions under an alternating magnetic field or solar illumination. The heat generated during the energy conversion process is stored in the form-stable phase change material due to the melting phase transition of PEG. Moreover, the phase change material nanocomposites exhibit high energy storage capacity (exceeding up to 100 J/g), excellent thermal stability and reversibility. This novel energy conversion and storage system will provide new insights into the field of energy management for electromagnetic or solar driven devices.
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RSC Advances
·
2019
·Vol. 9
·期 31
·17664-17673
·
IF 3.049
Kai Wang,Yi Yang,Tian C. Zhang,Ying Liang,Qingguo Wang
Magnetic Co-doped Fe3O4@FeOOH nanocomposites were prepared in one step using the hydrothermal synthesis process for catalyzing peroxymonosulfate (PMS) to degrade refractory methylene blue (MB) at a wide pH range (3.0–10.0). The catalysts' physiochemical properties were characterized by different equipment; Fe3+/Fe2+ and Co3+/Co2+ were confirmed to coexist in the nanocomposite by X-ray photoelectron spectroscopy. The nanocomposite effectively catalyzed PMS's decoloration (99.2%) and mineralization (64.7%) of MB. The formation of Co/Fe–OH complexes at the surface of nanoparticles was proposed to facilitate heterogeneous PMS activation. Compared with the observation for Fe3O4@FeOOH, the pseudo-first-order reaction constant was enhanced by 36 times due to Co substitution (0.1620 min−1 vs. 0.0045 min−1), which was assigned to the redox recycle of Fe3+/Fe2+ and Co3+/Co2+ in Co-doped Fe3O4@FeOOH. Besides, the catalyst could be easily reused by magnetic separation and exhibited relatively long-term stability.
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SOLAR ENERGY
·
2019
·
IF 4.674
Lei Shi,Xinzhi Wang,Yanwei Hu,Yurong He
The significant improvement in photocatalytic activity achieved in recent years has generated widespread attention due to its utilization in solar energy. In this study, two shapes of magnetic nanoparticles were synthesized using hydrothermal method. The magnetic nanoparticles exhibited superior photocatalytic activity for water treatment, which takes into consideration the photo-thermal conversion of magnetic nanoparticles. The effect of morphology on the photo-degradation was analyzed by the specific surface area measurement and photoluminescence test. Furthermore, the suspension degradation rate with magnetic nanoparticles was enhanced by ~200% compared to a commercial photocatalyst. Moreover, the photo-degradation efficiency further increased from 96.4 to 99.6% with the magnetic field intensity increased because of the absorbance ability enhancement. This result indicates that the photocatalytic activity of a magnetic photocatalyst can be enhanced through photo-thermal conversion and magnetic field regulation, which expands the application of solar power technology.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Xin Xu,Kang Shen,Min Wen,Qingliu Wu,Guangya Hou,Huazhen Cao,Liankui Wu,Guoqu Zheng,Yiping Tang
A three-dimensional (3D) Cu/Fe 3 O 4 anode material was synthesized successfully via a simple and flexible route. Cu nanowires grew on Cu sheet directly by oxidation and reduction as 3D current collector, Fe 3 O 4 nanosheets were coated on the collector surface by electrodeposition to form 3D Cu/Fe 3 O 4 nanocomposite. The characterization results showed that oxidation time affects the morphology of Cu nanowires greatly, the collector has optimum 3D nanostructure at 200 s oxidation with high performance. The 3D Cu/Fe 3 O 4 anode possessed high cycling capability, the capacity reached 700 mAh/g after 300 cycles at 0.5 A/g. And it exhibited high rate performance, the capacity reached 482 mAh/g at 2 A/g and it recovered to 853.5 mAh/g at 0.2 A/g after 100 cycles of different rate tests. The high performance is ascribed to the unique 3D nanostructure of current collector, which provides sufficient space for large volume change and stress release, and reduces the distance for transporting lithium ions and electrons.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Jun Hu,Zhiyong Huang,Jianming Yu
In this study, Fe/Fe 3 O 4 mixture was first applied as an additive to achieve the highly-effective mechanochemical destruction (MCD) of two halogenated organic pollutants (HOPs), hexachloroethane (HCE) and hexachlorobenzene (HCB). The MCD of HCE was more effective than that of HCB in virtue of the lower dissociation energy of C Cl bond. The MCD of HOPs occurred mainly via the reduction by Fe, Fe 3 O 4 and Fe/Fe 3 O 4 . The oxidation of Fe 3 O 4 and reduction of FeO (formed on account of the oxidation of Fe by oxygen-containing species) may also contribute to the HOP destruction. Fe/Fe 3 O 4 mixture exhibited a higher dechlorination rate (DR) than other three effective additives (i.e., Fe/SiO 2 , Al/Al 2 O 3 and Mg/Al 2 O 3 mixture), owing to the electrical property of Fe 3 O 4 and its electron transfer with Fe. The HOP destruction was significantly impacted by the mass fraction of Fe 3 O 4 (MF mag ) and achieved the maximum level with an MF mag of 70%. The DR of HOPs in the atmosphere of air was higher than those of pure oxygen and nitrogen because of the oxygen vacancy in Fe 3 O 4 and oxidation of Fe. The presence of water dramatically inhibited the HOP destruction due to the decrease of collision energy and its competition for the active sites in both Fe and Fe 3 O 4 . As expected, the DR of HOPs increased with rotation speed, and the mass ratio of ball to reactant and additive to pollutant. The analysis of intermediates indicates that HCB destruction was mainly via dechlorination and polymerization, while HCl cleavage also played an important role in HCE destruction. The results demonstrate that Fe/Fe 3 O 4 mixture is a suitable additive for MCD process.
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高影响因子
RSC Advances
·
2018
·Vol. 8
·期 35
·19486-19493
·
IF 2.936
Gang-Tian Zhu,Fei Liu,Sheng He,Xiao-Mei He,Shu-Kui Zhu,Yu-Qi Feng
Magnetic aqueous ammonia (MAA) was prepared as a magnetic extractant for dispersive microextraction of petroleum acids (PAs). The amount of extractant in MAA was custom-made by a simple approach. In the MAA composed of an aqueous ammonia coating and Fe3O4@SiO2 core, the coating is a base extractant that can selectively extract acids, while the magnetic core serves as a support to achieve dispersion as well as rapid magnetic retrieval of the extractant during the extraction processes. This is the first use of reusable, stable and modifiable Fe3O4@SiO2 as a support instead of bare Fe3O4 in a magnetic particle assisted dispersive liquid–liquid microextraction technique. The parameters that affect extraction efficiency were investigated. The sampling step as well as the desorption step can be completed in 2 min. The linear ranges are 5–5000 ng g−1, while the limits of quantification range from 2.5 to 6.2 ng g−1. The recoveries in spiked crude oil samples are in the range of 79.1% to 112.1% with relative standard deviations less than 11.3% (intra-day) and 13.4% (inter-day). Finally, the proposed method was applied to the analysis of PAs in diluted crude oils with different maturities. In comparison to the existing methods for extraction of PAs, the proposed method provides superior performances including high throughput (12-well plate), high degree of sample clean-up, and low consumption of separation material, solvent and time.
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Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 42
·6848-6857
·
IF 4.776
Ying Yang,Chen Wang,Chen Tian,Hailing Guo,Yuhua Shen,Manzhou Zhu
Considering traditional treatment methods, such as chemotherapy, with their potential side effects and lack of targeting, photodynamic therapy (PDT) and photothermal therapy (PTT), being innovative, with less side effects, and light-controlled strategies for antitumour applications, have received extensive attention, but the efficacy of PDT is seriously hindered by the hypoxia tumour microenvironment. Here, a multifunctional nanocomposite composed of an iron oxide (Fe3O4) core and two shells of manganese dioxide (MnO2) and polypyrrole (PPy) was successfully prepared and used to solve these issues. PPy, simultaneously as the photothermal agent and photosensitizer, was first combined with MnO2 to coat magnetic Fe3O4 for achieving an increase in the intracellular O2 concentration and to improve the generation ability of singlet oxygen upon laser irradiation, so that enhanced PDT/PTT could be obtained. After the efficient loading of doxorubicin (DOX) on the Fe3O4@MnO2@PPy nanocomposite, an acid controlled-release behaviour for DOX as well as magnetic-targeting-assisted synergistic effects of chemotherapy and improved PDT/PTT for tumour cells could be realized, which could also protect normal cells from damage. All these features may render our nanocomposite a promising platform to reverse hypoxia-triggered PDT resistance and chemotherapy-caused side effects in cancer therapy and other biomedical applications.
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Scientific Reports
·
2018
·Vol. 8
·期 1
·1-11
·
IF 4.122
Zhuang Xueheng,Zhang Ying,Cai Chang,Zhang Jing,Zhu Yuejin
Magnetic microencapsulated phase change materials (magnetic MicroPCMs) are hotly researched for their dual-functions with phase change and magnetic properties, which provided the new applications in fields of maneuverable phase change materials and infrared electromagnetic dual shield. A series of magnetic MicroPCMs samples are synthesized by polymerization and coprecipitation method and the chemical composition contained poly(MMA-MAA) @ n-octadecane modified by Fe 3 O 4 . In addition, the characterizations exhibit the excellent magnetic and phase change properties. The magnetic MicroPCMs samples present 20 emu·g −1 saturation magnetization with still high enthalpy of 132 J·g −1 , which fully illustrates that the magnetic MicroPCMs fulfill both application on thermal energy storage and magnetic control.
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CHEMICAL PHYSICS LETTERS
·
2018
·
IF 1.686
Qingqian Fan,Yueping Guan,Zhi Zhang,Guoli Xu,Yu Yang,Chen Guo
A new method was developed for preparing monodisperse Fe 3 O 4 @SiO 2 magnetic core-shell nanoparticles via three steps. The obtained nanoparticles exhibit high saturation magnetization, good surface topography and dispersion as characterized by FTIR, SEM and VSM. The experimental results of hydrochloric acid treatment show that the obtained nanoparticles have excellent acid resistance and stable and compact silicon coating. The magnetic core-shell nanoparticles were further tested for purification of plasmid DNA from E. coli DH5a cells. The result of purification leaded to better adsorption, elution and purity results in comparison with isolated commercial extraction kit.
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危险品化学品经营许可证（带存储）