JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Haibo Zhang,Jia Wen,Ying Fang,Siyu Zhang,Guangming Zeng
Hypothesis Modification of MIL-100(Fe) with ethanediamine (ED) is expected to improve the removal percentage of Pb(II) ions from aqueous solution. Nevertheless, the adsorption performance of ED-MIL-100(Fe) in natural waters will be affected by natural organic matter such as fulvic acids (FA). Hence, it is necessary to study the influence of FA on the physicochemical property, adsorption behavior and mechanisms of ED-MIL-100(Fe) towards the removal of Pb(II) from water. Experiments Batch adsorption experiments were conducted to compare adsorption capacity of MIL-100(Fe) and ED-MIL-100(Fe) for Pb(II). In addition, XRD , FTIR, SEM and XPS techniques were applied to investigate the characteristics, adsorption isotherms , and kinetics in the presence and absence of FA. Findings ED-MIL-100(Fe) enabled 99% removal of Pb(II) from water at or below 60 mg L −1 , whereas the MIL-100(Fe) hardly adsorbed any Pb(II). Additionally, the adsorption percentage of the Pb(II) ions (76%) outcompeted that of other metal ions (i.e. Co, Cu, Ni, Zn, and Cd) (each ≤ 25%) in the mixed solution. The negative surface charge of ED-MIL-100(Fe) was not affected by FA. Increasing FA concentration steadily increased the functional groups surrounding the ED-MIL-100(Fe) via electrical interaction, thus facilitating the Pb(II) ions adsorption.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2018
·
IF 6.653
Jing Chen,Nannan Wu,Xinxin Xu,Ruijuan Qu,Chenguang Li,Xiaoxue Pan,Zhongbo Wei,Zunyao Wang
Potassium ferrate [Fe(VI)] is a promising oxidant widely used in water treatment for the elimination of organic pollutants. In this work, the reaction kinetics, products, and mechanisms of the antimicrobial agent chlorophene (CP) undergoing Fe(VI) oxidation in aqueous solutions were investigated. CP is very readily degraded by Fe(VI), with the apparent second-order rate constant, k, being 423.2 M–1 s–1 at pH 8.0. A total of 22 oxidation products were identified using liquid chromatography–quadrupole time-of-flight–mass spectrometry , and their structures were further elucidated using tandem mass spectrometry. According to the extracted peak areas in mass spectra, the main reaction products were the coupling products (dimers, trimers, and tetramers) that formed via single-electron coupling. Theoretical calculations demonstrated that hydrogen abstraction should easily occur at the hydroxyl group to produce reactive CP· radicals for subsequent polymerization. Cleavage of the C–C bridge bond, electrophilic substitution, hydroxylation, ring opening, and decarboxylation were also observed during the Fe(VI) oxidation process. In addition, the degradation of CP by Fe(VI) was also effective in real waters, which provides a basis for potential applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Qian Peng,Yaobin Ding,Lihua Zhu,Guangli Zhang,Heqing Tang
A composite of Fe/Fe 3 C and N-doped graphitic carbon (Fe/Fe 3 [email protected] ) was prepared and used as a catalyst for the activation of peroxymonosulfate (PMS) toward the oxidative degradation of Norfloxacin (NOF). It was observed that Fe/Fe 3 [email protected] behaved as a bifunctional material, showing both good adsorption ability and catalytic activity. The maximum adsorption capacity of Fe/Fe 3 [email protected] for NOF was evaluated as 0.13 mmol g −1 . Under given conditions (NOF concentration 0.1 mmol L −1 , catalyst load 0.1 g L −1 and PMS addition 1 mmol L −1 ), the degradation of NOF was almost completely achieved in 20 min with a degradation rate constant of 0.22 min −1 . A non-radical mechanism was proposed for the activation of PMS by Fe/Fe 3 [email protected] by the scavenging test, EPR and chronoamperometry analysis. The fast and complete degradation of NOF was achieved via a rapid electron transform, in which both PMS and NOF molecular were adsorbed on the surface of Fe/Fe 3 [email protected] and PMS was activated by obtaining electrons from NOF to oxidize NOF. The present study provides a green bifunctional catalyst for the oxidative removal of organic pollutants in various environmental media.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2014
·
IF 2.063
Zhigang Jia,Lulu Yang,Jianhong Liu,Qiuze Wang,Rongsun Zhu
Magnetic carbon spheres have been successfully prepared by the synchronous carbonation and activation of the 8-quinoliolato Fe(III) complexe with sphere morphology, which has been synthesized by solovthermal method. The obtained composite possesses relatively even pore diameter of 3.8 nm, high surface area of 335.59 m 2 /g with 52.67 wt.% Fe 3 O 4 coated, and a saturation magnetization (Ms) of 35.27 emu/g. Dye separation performance of the magnetic carbon spheres is investigated using methylene orange and methylene blue as modle. The resluts show that the maxium adsorption capacity for methylene orange and methylene blue is 128.70 mg g −1 and 151.29 mg g −1 , respectively, and the process can rapidly reach adsorption equilibrium within 5 min, which is important for the application of the as-prepared magnetic carbon spheres.
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JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Guofu Ma,Jiajia Li,Kanjun Sun,Hui Peng,Jingjing Mu,Ziqiang Lei
A gel polymer PVA–KOH–K 3 [Fe(CN) 6 ] is prepared by potassium hydroxide and potassium ferricyanide doped polyvinyl alcohol, and a solid-state supercapacitor is assembled using the gel polymer as electrolyte and separator, activated carbons as electrode. The gel polymer exhibits flexible, high ionic conductivity and wide potential properties. The electrochemical properties of the supercapacitor are investigated using cyclic voltammetry , galvanostatic charge/discharge, and impedance spectroscopy techniques. The electrode specific capacitance of the supercapacitor can be as high as 430.95 F g −1 , and after 1000 cycles at a current density of 1 A g −1 it still remains higher than 380 F g −1 . The energy density and power density of the supercapacitor reach 57.94 Wh kg −1 and 59.84 kW kg −1 , respectively. These novel flexible gel polymers are desirable for applications in supercapacitor devices.
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Analytical Methods
·
2014
·Vol. 6
·期 19
·7973-7977
·
IF 1.938
Yingfeng Qin,Liangliang Zhang,Gaojie Ye,Shulin Zhao
A homogeneous label-free colorimetric sensing strategy for bleomycin (BLM) assay was developed on the basis of BLM enhanced Fe(II)–H2O2–ABTS reaction. Fe(II) exhibits a catalytic effect on H2O2-mediated oxidation of ABTS by Fenton chemistry. BLM·Fe(II) complex possessed a significantly higher catalytic ability than Fe(II) probably because of the further formation of more active “activated oxo-iron-bleomycin complex”. The present method was convenient without any complicated chemical synthesis, modification, or tedious experimental procedures. Analysis results can be seen with the naked eye and monitored by UV-vis spectra. The peak absorbance exhibits a linear relationship with BLM concentrations from 25 nM to 1 μM, and a detection limit of 16 nM can be achieved. The designed colorimetric strategy may provide a promising alternative for BLM detection in clinical samples.
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Nano Research
·
2015
·Vol. 8
·期 12
·3815-3822
·
IF 7.01
Wang Lingxiao,Geng Jing,Wang Wenhai,Yuan Chao,Kuai Long,Geng Baoyou
The sluggish oxygen evolution reaction (OER) is an important half-reaction of the electrochemical water-splitting reaction. Amorphous Fe/Ni composite oxides have high activity. In this work, we modified the aerosol spray-assisted approach and obtained amorphous Fe-Ni-O
x
solid-solution nanoparticles (Fe-Ni-O
x
-NPs) approximately 20 nm in size by choosing iron/nickel acetylacetonates as raw materials instead of inorganic salts. The small-sized Fe-Ni-O
x
-NPs were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) analysis, energy-dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS). Furthermore, an investigation of electrochemical OER performance suggests that the small-sized Fe-Ni-O
x
-NPs have higher activity than the large-sized Fe-Ni-O
x
-MPs. A small overpotential of 0.315 V was demanded to obtain a working current density of 50 mA/cm 2 , and the Tafel slope was as low as 38 mV/dec.
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CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Weirong Zhao,Yajun Li,Meng Zhang,Jinsheng Chen,Lihong Xie,Qiaomeng Shi,Xi Zhu
Fe-doped TiO 2 photocatalysts were synthesized rapidly and directly by the microwave–hydrothermal method and evaluated for hydrogen production by water splitting under UV–vis irradiation. The photocatalysts were characterized by X-ray diffraction, transmission electron microscopy, N 2 adsorption–desorption isotherms, inductively coupled plasma atomic emission spectroscopy, UV–vis spectroscopy, X-ray photoelectron spectra and photoelectrochemical experiments. The results showed that Fe-doped TiO 2 photocatalysts synthesized by the microwave–hydrothermal method exhibited a smaller crystallite size and higher specific surface area than TiO 2 photocatalysts. The microwave–hydrothermal method was a feasible way to increase the Fe doping concentration with enhanced electron–hole separation and electron transfer efficiency. It was also observed by first-principles density functional theory calculations that Fe can induce the formation of impurity levels near the valence band, leading to the reduction of the band gap and the improvement of photocatalytic activity. The highest photoactivity was achieved for TiO 2 doped with 0.5% Fe with a hydrogen production rate of 10.95 μmol h −1 .
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Huan Zhang,Yi Tan,Jiayan Li,Bing Xue
The performances of rayon (RGF) and polyacrylonitrile (PGF) based graphite felts as electrodes are compared in the iron-chromium redox flow battery (ICRFB). The essential differences in structure between RGF and PGF are also characterized in this study. The results show that the RGF electrode displays excellent electrochemical performance for negative redox couple (Cr 3+ /Cr 2+ ), resulting in the cell with higher charge efficiency and slower capacity decay. However, due to the high degree of graphitization and electrochemical activity for positive redox couple (Fe 2+ /Fe 3+ ) in PGF, the cell using PGF has higher voltage efficiency and energy efficiency, as well as lower area surface resistance than the cell with RGF. The fundamental difference between RGF and PGF is the crystallites structure in radial direction and basal plane of the fiber. PGF with the core-rim structure has better graphitization stacked in radial direction of the fiber. Further, PGF has more defective carbons exposed in the basal planes, while the surface of RGF exhibits a higher concentration of oxygen functional groups. The role of catalysts in the ICRFB has also been studied by introducing bismuth (Bi) into RGF and PGF used as negative electrodes. The electrocatalytic activities of RGF and PGF before and after modification with Bi are investigated by cyclic voltammetry (CV), linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS). Bismuth deposition on the negative electrode is found to improve the negative reaction in ICRFB.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Li-Feng Zhu,Bo-Ping Zhang,Shun Li,Gao-Lei Zhao
The (1- x )Bi 1+ y (Fe 0.96 Mg 0.02 Ti 0.02 )O 3 - x BaTiO 3 (abbreviated as B 1+ y FMT- x BT) system was designed to explore the morphotropic phase boundary (MPB) separating rhombohedral ( R ) and tetragonal ( T ) phases, and the mechanism of performance enhancement. The phase structure of samples was discreetly investigated by X-ray diffraction, and Rietveld refinement results of the XRD data revealed that the B 1+ y FMT- x BT ceramics consist of an R phase at x = 0.24, two R and T phases at 0.26 ≤ x ≤ 0.32, and a single T phase at x = 0.34. Because of the MPB and the improvement of resistivity with adding excess Bi compensation, excellent piezoelectric properties of d 33 = 198 pC/N and k p = 30.9%, as well as high Curie temperature T C = 497 °C were achieved in the B 1+ y FMT- x BT system at x = 0.30 and y = 0.02. Here, the large d 33 = 198 pC/N which is the maximum value for the BF-BT-Bi(Mg,Ti)O 3 system so far, and high T C = 497 °C suggest that Bi(Fe,Mg,Ti)O 3 -BaTiO 3 ceramics have good prospects in high-temperature piezoelectric devices.
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FUEL
·
2017
·
IF 4.601
Chuang Li,Guangyue Xu,Yongxiang Zhai,Xiaohao Liu,Yanfu Ma,Ying Zhang
Gamma-valerolactone (GVL) has been identified as a sustainable high-value platform molecular for the production of fuels and carbon-based chemicals. In this work, a series of activated carbon supported low-cost bimetallic Ni-Fe catalysts (Ni-Fe/AC) with different molar content of Fe species were prepared by using co-precipitation method for the liquid phase hydrogenation of ethyl levulinate (EL) to produce γ-valerolactone. The Ni-Fe 0.5 /AC exhibited the highest activity among the bimetallic or monometallic catalysts under mild reaction conditions (100 °C, 4 MPa H 2 , 6 h) and achieved 99.3% conversion of EL and 99.0% yield of GVL. Under more mild conditions (60 °C, 2 MPa H 2 ) and prolonging the reaction time to 24 h, EL could be converted completely and the obtained GVL yield was more than 98%. The catalysts were characterized by various techniques including XRD, TEM, HRTEM, EDX, XPS, H 2 -TPR and NH 3 -TPD. Based on the structure and activity relationship study, the formation of highly dispersed Ni-Fe alloy structure and the co-presented FeO x nanoparticles could be responsible for the high catalytic hydrogenation activity.
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DALTON TRANSACTIONS
·
2016
·Vol. 45
·期 19
·7952-7959
·
IF 4.177
Qiao Sun,Min Liu,Keyan Li,Yitong Han,Yi Zuo,Junhu Wang,Chunshan Song,Guoliang Zhang,Xinwen Guo
A series of MIL-53(Fe)-type materials, Fe(BDC)(DMF,F), were prepared by using different ratios of n(FeCl3)/n(FeCl2), which have varied amounts of Fe2+ in their frameworks. From FeCl3 to FeCl2, the structures of the synthesized samples transform from MIL-53(Fe) to Fe(BDC)(DMF,F). Along with this structure transformation, the crystal morphology goes through a striking change from a small irregular shape to a big triangular prism. This phenomenon indicates that the addition of FeCl2 is beneficial for the formation of a Fe(BDC)(DMF,F) structure. The catalytic activity of these iron-containing MOFs was tested in phenol degradation with hydrogen peroxide as an oxidant at near neutral pH and 35 °C. The degradation efficiency of these samples increases gradually from MIL-53(Fe) to Fe(BDC)(DMF,F). 57Fe Mössbauer spectra reveal that Fe2+ and Fe3+ coexist in the Fe(BDC)(DMF,F) framework, and the highest amount of Fe2+ in the sample prepared with mixed FeCl3 and FeCl2 is 26.0%. The result illustrates that the amount of Fe2+ in the samples can be controlled using varied n(FeCl3)/n(FeCl2) in the feed. The diverse amount of Fe2+ in this series of FeMOF materials exactly explains the distinction of reaction efficiency. The iron leaching tests, structures of the fresh and used catalysts, and the data of the recycling runs show that the Fe-containing MOFs are stable in this liquid-phase reaction.
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