INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
·
IF 3.573
Xuemei Liu,Yuan Wang,Tian C. Zhang,Gang Xiang,Xinlong Wang,Shaojun Yuan
Arsenic pollution has drawn wide attention, owing to its severe carcinogenicity, strong poisonousness, and high mobility in groundwater. Herein, a magnetic heterojunction nanocomposite of TiO2/polythiophene/γ-Fe2O3 (TiO2/PTh/γ-Fe2O3) was fabricated by one-pot oxidation polymerization as a novel photocatalyst for removing trace As(III) from aqueous solution by a visible-light-driven photocatalytic oxidation–adsorption coupling process. The nanocomposite showed excellent stability to adsorb As(III) in a low-pH region (2–6). Under dark conditions, approximately 46.5% of As(III) was adsorbed by the as-synthesized nanocomposite, and the kinetic data indicated the dominating chemical adsorption. However, under visible light illumination, more than 99.1% of As(III) was transformed into As(V) and simultaneously 90.1% of produced As(V) was adsorbed by the nanocomposite. Furthermore, the photogenerated holes (h+) and superoxide free radicals (•O2–) were the main reactive substances on the TiO2/PTh/γ-Fe2O3 nanoparticle for visible-light-driven photocatalytic oxidation of As(III). The novel magnetic TiO2/PTh/γ-Fe2O3 heterojunction nanocomposite may have potential application for arsenic removal in the aquatic environment.
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Catalysts
·
2020
·Vol. 10
·期 2
·189
·
IF 3.52
Ting Zhang,Chunyuan Qian,Pengran Guo,Shuchai Gan,Lingyu Dong,Ge Bai,Qiyang Guo
Ciprofloxacin, a third-generation fluoroquinolones (FQs) antibiotic, is observed to increasingly pollute the environment. In this study, a three-dimensional reduced graphene oxide-attapulgite-based catalyst Fe2O3/RGO-ATP was prepared and used to analyze the degradation of ciprofloxacin in a heterogeneous Fenton reaction. The heterogeneous catalyst Fe2O3/RGO-ATP was prepared by a one-step hydrothermal method, and the samples were characterized using BET(Brunauer-Emmett-Teller) surface area, Raman spectroscopy, X-ray diffraction (XRD), Fourier infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The effect of reaction time, temperature, pH, initial concentration, H2O2dosage and reuse time on the degradation of ciprofloxacin by the catalyst Fe2O3/RGO-ATP was investigated. The optimum conditions of degradation of ciprofloxacin are observed to be 60 °C, pH 5, H2O2concentration of 2.9724 mmol/L, and initial ciprofloxacin concentration of 50 mg/L. The catalyst could be reused several times with a decline in catalytic capacity. Fourier-transform ion cyclotron resonance mass spectrometer (FT) was also employed to study the degradation products of ciprofloxacin in the aqueous solution. The results show that the heterogeneous catalyst Fe2O3/RGO-ATP possessed an excellent ability for the catalytic degradation of ciprofloxacin. Direct hydroxyl oxidation is noted to be the main pathway of degradation of ciprofloxacin, and no defluorination reaction is observed during the degradation process.Keywords:graphene;ciprofloxacin;catalytic degradation;hydroxyl oxidation
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 10
·1-10
·
IF 5.833
Xu Shengrui,Dong Panlong,Qin Ming,Liu Hailin,Long Anying,Chen Changpo,Feng Suling,Wu Hongjing
Core-shell structured Fe 2 O 3 /CeO 2 @MnO 2 microspheres were fabricated and used as solid-phase microextraction coating for determination of polycyclic aromatic hydrocarbons (PAHs) in water samples. XPS spectra demonstrated the generation of abundant surface oxygen on Fe 2 O 3 /CeO 2 @MnO 2 microspheres, which provided binding sites for enhancement of analyte extraction. Under optimized conditions, the proposed method presented good linearity in the concentration range 0.04–100 ng mL −1 , with low limits of detection varying from 0.38 to 3.57 ng L −1 for eight PAHs. Relative standard deviations for a single fiber and five batches of fibers were in the ranges of 4.1–8.2% and 7.1–11.4%, respectively. The proposed method was successfully used for determination of PAHs in real river water samples with recoveries ranging from 87.1 to 115.9%. The proposed method using as-prepared Fe 2 O 3 /CeO 2 @MnO 2 microspheres as SPME coating exhibit significant potential for real sample analysis due to its excellent reproducibility, high sensitivity, and good linearity. Graphical abstract
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PubMed
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Junyi Liu,Xianxiang Liu,Qiong Xu,Dulin Yin
A series of highly active and ortho -position selective catalysts based on (α-Fe 2 O 3 ) 1- x (V 2 O 5 ) x catalysts were proposed for the C -methylation of phenol with methanol. The (α-Fe 2 O 3 ) 1- x (V 2 O 5 ) x catalysts were synthesized by coprecipitation method of Fe and V elements and microwave drying. The chemical composition, material structure, acid-base properties, and structure-activity relationship of (α-Fe 2 O 3 ) 1- x (V 2 O 5 ) x catalysts were systematically analyzed by the techniques of XRD, XPS, TEM, N 2 adsorption-desorption, Raman, UV-Vis, ESR, NH 3 /CO 2 -TPD and Pyridine-IR. The (α-Fe 2 O 3 ) 1- x (V 2 O 5 ) x catalysts have the double advantages of high activity and high stability for the methylation of phenol due to the high BET surface area, large total pore volume, dispersive active sites and enhanced acid-base property. o -cresol and 2,6-xylenol were the main products, and nearly 100% selectivity to the ortho -position of phenol and 90% selectivity to o -cresol were obtained. Furthermore, the (α-Fe 2 O 3 ) 1- x (V 2 O 5 ) x catalysts possess long lifetime over 2500 h and high activity at a weight hourly space velocity of 1.6 h −1 compared with the microwave-dried α-Fe 2 O 3 catalyst. The doping of vanadium improves the activity and stability of α-Fe 2 O 3 catalyst, which attributes to the modification of catalyst structure, especially the improvement of acid-base centers and oxygen vacancy. Recently the (α-Fe 2 O 3 ) 1- x (V 2 O 5 ) x catalysts have been stably and efficiently applied in industry for the methylation of phenol.
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Nano Energy
·
2019
·
IF 15.548
Baoyu Sun,Shuaifeng Lou,Zhengyi Qian,Pengjian Zuo,Chunyu Du,Yulin Ma,Hua Huo,Jingying Xie,Jiajun Wang,Geping Yin
Transition metal oxides are regarded as the promising anodes for lithium ion batteries owing to the high theoretical capacities. However, the mechanical and electrochemical degradations severely reduce the electrode lifetime and limit its practical application. Here, for the first time, a novel CoFe 2 O 4 @Fe 2 O 3 nanocomposites combing dual Li-ions channels and stabilized hollow sphere architecture is reported. The unique transport routes for lithium ion have been created by the design of surface holes and inner channels, offering extra lithium storage sites and accelerating its transport. Quantitative kinetic analysis reveals that the capacity based on hollow sphere heterostructured NLCFs is governed by pseudocapacitance , especially at high current rates, exhibiting excellent rate performance and high specific capacity. Benefiting from the steady sphere hollow configuration and abundant ions channels, the NLCFs nanocomposites deliver excellent long-term stability (520 and 477 mAh g −1 at 5 and 10 A g −1 for 2000 cycles, respectively) with ultrahigh Coulombic efficiency (more than 99.5%). And the full cell can remain a reversible capacity of 516 mAh g −1 at the current density of 1 A g −1 after 500 cycles. This interesting dual lithium ion channels design opens a new avenue to build high-power LIBs for electrochemical energy applications .
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2015
·
IF 7.435
Qiusheng Peng,Hongying Zhao,Lin Qian,Yanbin Wang,Guohua Zhao
A novel three-dimensional ordered macroporous Fe 2 O 3 /CA cathode (3DOM–Fe 2 O 3 /CA) was fabricated by using self-assembled colloidal crystal template and proposed in solar photo-electro-Fenton (SPEF) process at neutral pH. 3DOM–Fe 2 O 3 /CA possessed 3D-ordered interconnecting marcopores (390–425 nm) with a hollow “cylindrical tube” in the vertical direction. Compared to the traditional Fe 2 O 3 /CA electrode, the 3DOM–Fe 2 O 3 /CA presented higher photocatalytic and Fenton oxidation ability. The interconnecting macropores generated multiple scattering and slow-photon effect for increasing light harvesting efficiency, while the nice channels minimized tortuosity and provided much more efficient mass transport. Almost complete removal of 200 mg L −1 imidacloprid was achieved in 2.5 h with 3DOM–Fe 2 O 3 /CA. The dynamic analysis showed that the degradation of imidacloprid follows the pseudo-first order reaction. The apparent rate constant for 3DOM–Fe 2 O 3 /CA electrode is 0.326 h −1 , which 2 times higher than that of reference Fe 2 O 3 /CA electrode. The energy consumption was used more effectively in SPEF with 3DOM–Fe 2 O 3 /CA. EPR and radical trapping experiments revealed that the OH radicals were main oxidants in SPEF system and 3D-ordered macroporous favored the formation of OH. Besides, 3DOM–Fe 2 O 3 /CA electrode presented very low iron leaching (<1 ppm) and retained high catalytic activity after consecutive runs.
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BIOSENSORS & BIOELECTRONICS
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2013
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IF 5.437
Zhicai Xing,Jingqi Tian,Abdullah M. Asiri,Abdullah H. Qusti,Abdulrahman O. Al-Youbi,Xuping Sun
In this article, for the first time, two-dimensional hybrid mesoporous Fe 2 O 3 –graphene (mFe 2 O 3 –G) nanostructures were developed as a peroxidase mimetic with catalytic activities superior to those of mFe 2 O 3 , G, and previously reported Fe-based peroxidase mimetics. The high-surface-area mFe 2 O 3 not only offers a large number of catalytically active sites, but also facilitates the diffusion of 3,3,5,5-tetramethylbenzidine (TMB) and H 2 O 2 toward G surface. On the other hand, G is π-rich and thus favors the adsorption and enrichment of TMB within these pores. These synergistic effects lead to highly improved catalytic performances. Based on these findings, a simple, rapid, and highly sensitive and selective optical detector of glucose has been developed and demonstrated in buffer solution with a pretty low detection limit of 0.5 μM. In addition, this nanosensor is reusable and can also be used for glucose detection in diluted serum.
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高影响因子
Materials Science & Engineering C-Materials for Biological Applications
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2015
·
IF 3.088
Feng Gao,Delun Zheng,Hidekazu Tanaka,Fengping Zhan,Xiaoning Yuan,Fei Gao,Qingxiang Wang
A highly sensitive electrochemical sensor for gallic acid (GA), an important polyphenolic compound, was fabricated using the hybrid material of chitosan (CS), fishbone-shaped Fe 2 O 3 (fFe 2 O 3 ), and electrochemically reduced graphene oxide (ERGO) as the sensing matrix. The electrochemical characterization experiments showed that the CS–fFe 2 O 3 –ERGO modified glassy carbon electrode (CS–fFe 2 O 3 –ERGO/GCE) had large surface area, excellent electronic conductivity and high stability. The GA presented a superior electrochemical response on CS–fFe 2 O 3 –ERGO/GCE in comparison with the single-component modified electrode. The electrochemical mechanism and optimal test conditions of GA on the electrode surface were carefully investigated. Under the optimal conditions, the oxidation peak currents in differential pulse voltammetry (DPV) experiments exhibited a good linear relationship with the logarithmic values of GA concentration over the range from 1.0 × 10 − 6 M to 1.0 × 10 − 4 M. Based on signal-to-noise (S/N) characteristic of 3, the detection limit was estimated to be 1.5 × 10 − 7 M. The proposed sensor has also been applied for estimating the antioxidant capacity index of real samples of red and white wines.
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高影响因子
Journal of Materials Chemistry B
·
2013
·Vol. 1
·期 37
·4845-4854
·
IF 0
Zhi-Gang Wang,Gong Cheng,Yan-Lin Liu,Ji-Lin Zhang,De-Hui Sun,Jia-Zuan Ni
Novel three-dimensional (3D) flowerlike hierarchical γ-Fe2O3@xNH4F·yLuF3 core–shell architectures were synthesized by a simple phase transformation route under mild conditions. The evolution of the flowerlike structure assembled by thin xNH4F·yLuF3 nanosheets has been investigated in detail. We found that an appropriate amount of NH4F and a suitable phase transformation reaction temperature are crucial for the formation of the flowerlike structure, while the calcination treatment is essential to maintain the well-defined core–shell structure. A possible formation mechanism was proposed for the phase transformation reaction and the self-assembly growth in situ. The novel composite material with large open pores, a specific surface area (26.2 m2 g−1), strong reversible magnetic response (Ms = 27.99 emu g−1), and good structural stability has been primarily applied for the selective and effective capture of phosphopeptides and it showed good performance. The obtained products may also have potential applications in areas such as water treatment, purification of biomolecules, and solid catalysis.
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RSC Advances
·
2014
·Vol. 5
·期 7
·5164-5172
·
IF 3.708
Yuhao Xiong,Fanggui Ye,Cong Zhang,Shufen Shen,Linjing Su,Shulin Zhao
A novel and inexpensive approach was adopted to develop magnetic porous γ-Fe2O3/C@HKUST-1 composites for the adsorption of dyes and heavy metal ions from aqueous solution. The γ-Fe2O3/C with unique functional groups present such as –OH and –NH2 was used as the support to directly grow HKUST-1 by a stepwise liquid-phase epitaxy process. The crystallographic, morphology, and magnetic properties as well as porosity of the as-synthesized γ-Fe2O3/C @HKUST-1 composites were carefully studied by XRD, SEM, TEM, XPS, TGA, and BET. The results indicated that the BET surface area, micropore volume, and saturation magnetization of the γ-Fe2O3/C @HKUST-1 are 993.4 m2 g−1, 0.69 cm3 g−1, and 12.6 emu g−1, respectively. In addition, a uniform distribution of ultrafine γ-Fe2O3 nanoparticles with an average diameter of 2–3 nm was observed in the γ-Fe2O3/C@HKUST-1 composites. Our results showed that methylene blue (MB) and Cr(VI) (used as a model for typical dye pollutants and heavy metal ions) are effectively removed from aqueous solutions by γ-Fe2O3/C@HKUST-1. The maximum adsorption capacities were 370.2 and 101.4 mg g−1 of adsorbent for MB and Cr(VI), respectively. Moreover, a removal efficiency of about 90% was retained after five cycles of consecutive adsorption–desorption. The adsorption kinetics data were well described by a pseudo-second-order model (R2 > 0.99), and equilibrium data were well fitted to the Langmuir isotherm model (R2 > 0.99). Finally, our results suggested that the γ-Fe2O3/C@HKUST-1 composites have a great potential to be employed for treatment of wastewater containing MB and Cr(VI).
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ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Zhenping Liu,Haiyun Zhai,Zuanguang Chen,Qing Zhou,Zhixian Liang,Zihao Su
A novel Fe 2 O 3 nano-materials/oxygen functionalized multi-walled carbon nanotubes/triton X-100 modified carbon paste electrode (Fe 2 O 3 /MWCNTs-COOH/OP/CPE) was prepared to simultaneously detect orange G (Or G) and orange II (Or II) by electrochemical methods. Compared with the bare carbon paste electrode (CPE), Fe 2 O 3 /MWCNTs-COOH/OP/CPE exhibited obvious electrocatalytic activities towards Or G and Or II. Furthermore, the two azo dyes were identified and separated successfully, and were simultaneously determined by the redox peaks in cyclic voltammograms (CVs) and differential pulse voltammogram (DPV) under optimum conditions. In DPV, anodic peak current (Ipa) and concentrations were linearly related well for 0.1-20.0 μM Or G and 0.2-50.0 μM Or II. The limits of detection (S/N = 3) of Or G and Or II were 0.05 μM and 0.1 μM, respectively. Therefore, the electrode is suitable for the determination of Or G and Or II in industrial wastewater due to high sensitivity and selectivity, low detection limit, good reproducibility, as well as easy preparation and regeneration.
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RSC Advances
·
2016
·Vol. 7
·期 1
·336-343
·
IF 3.289
Tao Chen,Yuhao Xiong,Yuemei Qin,Haiguan Yang,Peng Zhang,Fanggui Ye
In this study, a novel and low-cost method was developed for synthesizing magnetic porous γ-Fe2O3/C as an adsorbent and catalyst for removal of methylene blue (MB) from aqueous solution. Using FeCl3·6H2O and bagasse as the precursor, the biomass-based material was synthesized rapidly using a microwave heating process. Fe ions were introduced to achieve both adsorption and catalytic degradation by the Fenton reaction. Characterization by BET, XRD, SEM, and TEM indicated that the prepared γ-Fe2O3/C material exhibited homogeneous mesoporosity with a BET surface area, mesoporous volume, and saturation magnetization of 764.116 m2 g−1, 0.54 cm3 g−1, and 17.1 emu g−1, respectively. The material exhibited excellent adsorption and catalytic degradation abilities for removal of MB from aqueous solution (up to 352.96 mg g−1), with complete degradation of MB within 30 min. Moreover, γ-Fe2O3/C had good stability over 5 cycles. Therefore, this biomass-based γ-Fe2O3/C material can be used as a highly effective and low-cost adsorbent and catalyst and has great potential application in clean-up processes for environmental pollutants.
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