JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2018
·
IF 3.609
Ying Gong,Wenying Zhou,Zijun Wang,Li Xu,Yujia Kou,Huiwu Cai,Xiangrong Liu,Qingguo Chen,Zhi-Min Dang
In this work, graphene oxide (GO) nanosheets with surface modification by Tannic and Fe coordination complexes (TA-Fe) were incorporated into poly(vinylidene fluoride) (PVDF) to prepare high constant but low loss polymer nanocomposites , and the effect of TA-Fe interlayer on dielectric properties of the GO@TA-Fe/PVDF nanocomposites was investigated. The results indicate that the dosage, mixing ratio, and reaction time of TA-Fe complexes have obvious influences on the dielectric properties of the nanocomposites. Furthermore, the TA-Fe interlayer significantly influences the electrical properties of GO@TA-Fe nanoparticles and their PVDF composites, and the GO@TA-Fe/PVDF composites exhibit superior dielectric properties compared with raw GO/PVDF. Dielectric losses of the GO@TA-Fe/PVDF are significantly suppressed to a rather low level owing to the presence of TA-Fe layer, which serves as an interlayer between the GO sheets, thus preventing them from direct contacting with each other. Additionally, the dynamic dielectric relaxation of the GO/PVDF and GO@TA-Fe/PVDF nanocomposites was investigated in terms of temperature.
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Nanomaterials
·
2018
·Vol. 8
·期 4
·248
·
IF 3.504
Fuhua Wei,Ding Chen,Zhao Liang,Shuaiqi Zhao
Using a microwave-assisted ball-milling approach, Fe-based metal-organic frameworks (Fe-MOFs) were prepared from FeSO4·7H2O and trimesic acid. Scanning electron microscopy, Fourier-transform infrared spectrometry, X-ray, and thermogravimetric analysis were utilized to characterize the thermal stability and structure of the prepared Fe-MOFs. These Fe-MOFs were used to remove organic dyes from aqueous solutions. Specifically, they removed 96.97% of 23.3592 mg/L of Congo red in a 200 mL solution within 300 min of treatment with natural light at 15 °C. Likewise, 88.21 and 70.90% of 22.7527 mg/L of Orange II and 17.8326 mg/L of Rhodamine B, respectively, were removed from 200 mL solutions within 300 min of treatment at 15 °C. At 35 °C, 99.57, 95.98, and 99.38% of 23.3855 mg/L of Congo Red, 22.7365 mg/L of Orange II, and 17.9973 mg/L of Rhodamine B, respectively, were removed from 200 mL solutions within 300 min of treatment. The adsorption kinetics were investigated and the pseudo-first-order kinetic model was found to be superior to the pseudo-second-order kinetic model. Overall, using metal-organic frameworks to treat dye wastewater was found to be inexpensive, feasible, and efficient. Therefore, this material has future prospects in research and applications in the purification of wastewater.Keywords:wastewater treatment;metal-organic frameworks;dye removal;microwave-assisted ball milling
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Wen-Kun Gao,Jun-Feng Qin,Kai Wang,Kai-Li Yan,Zi-Zhang Liu,Jia-Hui Lin,Yong-Ming Chai,Chen-Guang Liu,Bin Dong
Cobalt sulfides have drawn enormous attention as earth-abundant alternatives to precious-metal electrocatalysts capable of catalyzing oxygen evolution reaction (OER) in alkaline medium. Although significant progresses have been realized in the development of various composite modulation to improve their properties for oxygen evolution, to boost their poor catalytic activity for oxygen evolution reaction is still challenging, which unambiguously limits the wide utilization of cobalt sulfides. Here, we present the facile growth of metal-doping (Fe, Ni) into Co 9 S 8 supported on nickle foam (NF) through a one-step simple hydrothermal process. The effect of (Fe, Ni)-doping on the morphology and the catalytic activity of Co 9 S 8 has been thoroughly investigated. Fe-Co 9 S 8 nano-microspheres supported on NF (Fe-Co 9 S 8 NM/NF) have been obtained with the remarkable electrocatalytic activity, which only requires a lower overpotential of 270 mV to reach a current density of 10 mA cm −2 and exhibits the smaller Tafel slope of 70 mV dec −1 as well as robust stability. The excellent OER performance of Fe-Co 9 S 8 NM/NF could be attributed to the synergistic interaction of Fe dopants with Co 9 S 8 nano-microspheres and faster charge transfer rate derived from NF support. This work provides a new and effective way to design metal-doped Co 9 S 8 -based heterostructures supported on conductive support as efficient OER electrocatalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
·
IF 5.091
Changjian Li,Yueqi Wang,Xiaojie Zhang,Xueling Guo,Xiaoxuan Kang,Libo Du,Yang Liu
Carbon dots have attracted considerable attention in the field of biosensors and bioimaging because of their excellent optical performance and low toxicity. However, the cellular uptake of the reported carbon dots generally has a low efficiency, which limits their practical applications. In this study, we reported a novel red fluorescent sulfur and nitrogen co-doped carbon dots with small molecular phenylboronic acid tags (i.e. S, N-CDs-PBA). The S, N-CDs-PBA can be taken up rapidly by PC12 cells in twenty minutes and showed high sensitivity for the detection of Fe 3+ ions. The maximum emission wavelength is at 593 nm under the excitation of 550 nm. The absolute fluorescence quantum yield is 23% in water. The fluorescence can be effectively and selectively quenched by Fe 3+ ions and the linear response range of Fe 3+ ions was obtained from 0.3 µM to 5.0 µM with a detection limit as low as 0.1 µM. It could be concluded that the rapid uptake of S, N-CDs-PBA into cells and high photoluminescence quantum yield of red emission are beneficial for quick detection of Fe 3+ ions.
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高影响因子
ACS Applied Energy Materials
·
2018
·
IF 0
Bao-Xia Dong,She-Liang Qian,Fan-Yan Bu,Yi-Chen Wu,Li-Gang Feng,Yun-Lei Teng,Wen-Long Liu,Zong-Wei Li
Heterogeneous electrocatalysis provides better control of the chemical surroundings of the catalyst’s active site for improved performance, offers the possibility of overcoming drawbacks of deactivation caused by aggregation or dimerization in homogeneous condition, and permits the use of benign aqueous solutions. Employing metal–organic frameworks (MOFs) or covalent–organic frameworks (COFs) to support the active molecular catalyst of porphyrin for electrochemical conversion of CO2 to CO is a promising strategy. We have rationally introduced a 3D highly stable porphyrin-based MOF of PCN-222(Fe) into heterogeneous catalysis through the simple dip-coating method. The composite catalyst PCN-222(Fe)/C (mass ratio = 1:2) exhibited high catalytic performance for electrochemical conversion of CO2 to CO with 494 mV overpotential (where j = 1.2 mA cm–2) and maximum 91% FECO in a CO2-saturated 0.5 M KHCO3 aqueous solution, achieving a TOF of 0.336 site–1 s–1. The catalyst was found to retain its crystallinity and stability after 10 h of electrolysis at −0.60 V versus RHE (average FECO 80.4%; RHE, reversible hydrogen electrode), which generates 334 μmol of CO with the TOF of 0.012 s–1 (0.286 site–1 s–1). These results indicate that the PCN-222(Fe)/C has a substantial catalytic effect on the electrochemical reduction of CO2 due to the combination of the intrinsic activity of the porphyrin molecule, and the promising CO2 adsorption ability endowed by the conserved porosity, as well as the high conductivity of carbon black.
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ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY
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2018
·
IF 2.776
Chen Zhou,Huiqing Wang,Youbin Si,Kang Wu,Amina Yousaf
The ability of anthraquinone-2,6-disulfonate (AQDS) and riboflavin to enhance the sulfamethoxazole (SMX) degradation coupled with the Fe(III) reduction by Shewanella oneidensis MR-1 was investigated. The results indicated that the SMX degradation rate was 38.5% with an initial SMX concentration at 0.04 mM. For the overall performance of AQDS and riboflavin mediated SMX degradation and iron reduction, the SMX degradation rate was gradually increased with the enhancement of iron reduction. Riboflavin had a stronger enhancement on SMX degradation and iron reduction than AQDS, but the enhancement was not positively correlated with electron shuttles concentration. A quantitative characterization of the electron transfer capacity (ETC) of the electron shuttles showed that the ETC was higher for riboflavin than AQDS. The S. oneidensis MR-1 16S rRNA gene copies results indicated that electron shuttles had a positive effect on the microbial activity of S. oneidensis MR-1. The LC MS result indicated that the products of the SMX biodegradation were 3-amino-5-methylisoxazole and 4-aminobenzenesulfonic acid, which suggested that the SMX biodegradation was caused by S N bond cleavage. This study indicates that the biochemical mechanisms play a vital role in SMX transformation and Fe(II) generation in this system.
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高影响因子
CHEMISTRY OF MATERIALS
·
2018
·
IF 9.89
Desheng Pan,Yong Li,Zheng Han,Bing Li,Chinwei Wang,Teng Yang,Da Li,Chuljin Choi,Zhidong Zhang
Incorporation of distinct organic molecules and inorganic fragments into a single crystalline lattice of organic–inorganic hybrid magnets has aroused much attention for novel physical properties and applications. Yet, there has been no report on the discovery of ordered organic–inorganic hybrid magnets with room-temperature magnetism. Here, we report a simple chemical solution method for synthesis of new organic–inorganic hybrid magnets built by organic Fe(teta)1.5 and inorganic FeSex segments. By changing the reaction temperature, the size of these hybrid nanostructures can be tuned from 100 nm to 4 μm, and their shapes vary from nanoparticles and nanobelts to nanoplates. Selected area electron diffraction and X-ray diffraction reveal that hybrid (β-Fe3Se4)4[Fe(teta)1.5] nanoplates are a single phase in a tetragonal crystal structure with the space group I4cm (108). The thermal magnetic curve between 5 and 900 K was characterized using a vibrating sample magnetometer, revealing room-temperature ferrimagnetism of the (β-Fe3Se4)4[Fe(teta)1.5] nanoplates with the Curie temperature (TC) higher than 530 K. In the case of hybrid nanoplates synthesized at 483 K, a giant coercivity value reaching 11 kOe is obtained at 5 K. Our study not only provides guidance for developing a chemical solution method for controllable fabrication of a new class of organic–inorganic hybrid materials but also enhances the magnetic ordering temperature of such magnetic organic–inorganic hybrid materials to be higher than room temperature.
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RSC Advances
·
2018
·Vol. 8
·期 70
·40022-40034
·
IF 2.936
Wei Du,Qin Xu,Dangqin Jin,Xiaoyu Wang,Yun Shu,Liming Kong,Xiaoya Hu
This work investigated the feasibility and efficiency of a heterogeneous photo-Fenton catalyst, Fe/Si codoped TiO2, for the degradation of metronidazole (MNZ) under visible light irradiation. The Fe/Si codoped TiO2 was prepared via a facile and simple sol–gel solvothermal process followed by annealing at 480 °C for 4 hours. High resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) measurements revealed that the photo-Fenton process did not change the structure, textural and surface morphologies of this catalyst. Elemental mapping results indicated the good dispersion of Fe and Si ions in TiO2. Nitrogen adsorption and desorption measurements indicated that Si doping increased the surface area of the catalysts. The Fe and Si doping narrowed the band gap of TiO2. They also facilitated the transfer of photo-generated electrons from TiO2 to Fe(III). Under visible light irradiation and the optimum operating conditions, MNZ could be completely degraded in 50 min by this catalyst within a wide pH range. Hydroxyl radicals and holes were verified to be responsible for degrading MNZ. The leaching of iron ions was less than 0.047 ppm even after illuminating the catalyst for 6 hours, indicating the good stability of the Fe/Si codoped TiO2. The as-prepared catalysts with excellent catalytic activity, and remarkable reusability and stability could provide a new insight into the preparation of photocatalysts and have wide applications for antibiotics removal.
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高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2018
·
IF 3.046
Bang Zhou,Yaqiang Dong,Lei Liu,Liang Chang,Fengqin Bi,Xinmin Wang
The core-shell structured FeSiBCCr@TiO 2 amorphous magnetic powder cores (AMPCs) with excellent comprehensive magnetic properties were successfully prepared using spherical amorphous powders with high quality insulating layer. Scanning electron microscopy, Energy dispersive X-ray spectroscopy analysis, X-ray diffraction, and Fourier transform infrared spectroscopy revealed that the surface of the Fe-based amorphous powders was covered by a continuous amorphous TiO 2 insulation layer. The performances of the AMPCs can be well tuned by changing the thickness of the insulation coating layer, which can be adjusted by controlling the concentration of tetrabutyl titanate (TBOT) in the hydrolysis and condensation reaction system. After annealing at 480 °C for 1 h, the AMPCs with TBOT concentrations of 0.15 ml/g exhibited excellent comprehensive soft magnetic properties, including the highest quality factor of 104.5 at 560 kHz and lowest core loss of 265 mW/cm 3 at f = 100 kHz and B m = 0.05 T. It also maintained a relatively high permeability of 67 up to 5 MHz and superior DC-bias permeability of 68% at a bias field of 100 Oe. This study demonstrated a modified method to develop a novel insulation coating layer to reduce the core loss and improve the magnetic properties of AMPCs.
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JOURNAL OF MOLECULAR CATALYSIS B-ENZYMATIC
·
2013
·
IF 2.823
Xiaolin Pei,Lirong Yang,Gang Xu,Qiuyan Wang,Jianping Wu
Microbial nitrile hydratases (NHases) are important industrial catalysts to produce valuable amides. However, only some NHase genes have been reported and studied at the molecular level. In this study, we developed a genome mining method to discover Fe-type NHases from GenBank. The putative NHase gene from Pseudomonas putida F1 was cloned and functionally expressed in Escherichia coli BL21 (DE3) by assisting of a putative activator gene adjacent to β-subunit region. Three recombinant plasmids containing NHase gene or the activator gene were designed and constructed. Maximal enzyme activity was obtained when the structural and activator genes were transcribed as one unit in plasmid pCDFDuet-1 at 18 °C. However, the expressed product did not show any NHase activity when the downstream activator gene was ignored, and the product completely existed in insoluble inclusion body. The activator gene might be involved in protein folding of the α- and β-subunits of NHase. In addition, the Fe-type NHase exhibited broad substrate specificity. The enzyme can efficiently hydrate aromatic nitriles, such as 3-cyanopyridine, 4-cyanopyridine, and benzonitrile, asides from aliphatic nitriles preferentially. Therefore, the recombinant NHase shows potential applications in some amides preparation.
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RSC Advances
·
2015
·Vol. 5
·期 50
·40094-40102
·
IF 3.84
Zhiming Yan,Wenmin Zhang,Jia Gao,Yifen Lin,Jianrong Li,Zian Lin,Lan Zhang
The application of the metal–organic framework (MOF) MIL-53(Fe) as a novel stationary phase for reverse-phase high performance liquid chromatography (HPLC) separation of positional isomers is described for the first time. Under the optimized conditions, baseline separation of xylene, dichlorobenzene, chlorotoluene and nitroaniline isomers was achieved on the MIL-53(Fe) packed column within a short time. The retention mechanisms of these isomers on the MIL-53(Fe) packed column were discussed in detail, and a typical reverse-phase behavior can describe the results. The thermodynamic characteristics of the HPLC separation of positional isomers were also evaluated. It was confirmed that the HPLC separation of positional isomers was controlled by the Gibbs free energy change (ΔG). In addition, reverse-phase HPLC separation of the tested isomers was also carried on MIL-53(Al, Cr) packed columns to investigate the influence of the metal centre of the MIL-53 framework on their chromatographic behaviors. The results showed that the MIL-53(Fe) packed column exhibited better separation performance than the MIL-53(Al, Cr) packed columns. Moreover, the MIL-53(Fe) packed column also gave efficient HPLC separation of alkylbenzene and naphthalene, aniline compounds and polycyclic aromatic hydrocarbons (PAHs). These successful applications suggest the potential of MIL-53(Fe) as a novel stationary phase for efficient reverse-phase HPLC separation.
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ChemCatChem
·
2014
·Vol. 7
·期 3
·441-449
·
IF 5.044
Hui Wan,Chong Chen,Zuowang Wu,Yigen Que,Yu Feng,Wei Wang,Lei Wang,Guofeng Guan,Xiaoqin Liu
Graphical Be more active: A new strategy is proposed to construct the ionic liquid, polyoxometalate (POM), and metal–organic framework (MOF) composite. POM bridges the gap between the ionic liquid and the carrier (MOF); thus, the heteropolyanion-based ionic liquid can be encapsulated within the cages of MIL-100 (MIL=Materials of Institut Lavoisier) through anion exchange. The POM–ionic-liquid-functionalized MOF demonstrates high catalytic activity for the esterification of oleic acid with ethanol and is stable in the liquid-phase reaction, with no obvious leaching of the active component. A new strategy was proposed to construct the ionic liquid, polyoxometalate (POM), and metal–organic framework (MOF) composite. The POM-based MOF was synthesized by using the direct hydrothermal method. The sulfonic acid group-functionalized ionic liquid was used for further modification of the hybrid material to realize the encapsulation of the heteropolyanion-based ionic liquid within the cages of the MOF. The catalysts were characterized by using XRD, N 2 adsorption–desorption, FTIR, SEM, TEM, elemental analysis, and TGA. The results indicated that the heteropolyanion-based ionic liquid had been successfully encapsulated within the cages and the structure of MIL-100 (MIL=Materials of Institut Lavoisier) remained intact. The POM–ionic-liquid-functionalized MOF, with high content of the active component, had both Lewis and Brønsted acid sites, which led to high catalytic activity for the esterification of oleic acid with ethanol. The esterification reaction conditions were optimized by using response surface methodology (RSM), and the corresponding conversion of oleic acid reached 94.6 %. The catalyst could be easily recovered and reused six times without significant loss of activity.
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