As(III) Sequestration by Iron Nanoparticles: Study of Solid-Phase Redox Transformations with X-ray Photoelectron Spectroscopy

2012 ◽  
Vol 116 (9) ◽  
pp. 5303-5311 ◽  
Author(s):  
Weile Yan ◽  
Mauricio A. V. Ramos ◽  
Bruce E. Koel ◽  
Wei-xian Zhang
Keyword(s):  
Photoelectron Spectroscopy ◽  
Iron Nanoparticles ◽  
Solid Phase ◽  
X Ray ◽  
Redox Transformations

scholarly journals Highly Efficient and Stable Removal of Arsenic by Live Cell Fabricated Magnetic Nanoparticles

2019 ◽  
Vol 20 (14) ◽  
pp. 3566
Author(s):  
Hyo Kyeong Kim ◽  
Sun-Wook Jeong ◽  
Jung Eun Yang ◽  
Yong Jun Choi
Keyword(s):  
Photoelectron Spectroscopy ◽  
Iron Nanoparticles ◽  
Deinococcus Radiodurans ◽  
Specific Treatment ◽  
Arsenic Species ◽  
Live Cell ◽  
Toxic Substances ◽  
X Ray ◽  
Removal Capacity

As concerns about public health and environmental problems regarding contamination by toxic substances increase worldwide, the development of a highly effective and specific treatment method is imperative. Although physicochemical arsenic treatment methods have been developed, microbial in vivo remediation processes using live cell fabricated nanoparticles have not yet been reported. Herein, we report the development of magnetic iron nanoparticles immobilized an extremophilic microorganism, Deinococcus radiodurans R1, capable of removing toxic arsenic species. First, in vivo synthesis of magnetic iron nanoparticles was successfully achieved with the D. radiodurans R1 strain and characterized by scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDX), dynamic light scattering (DLS), zeta-potential, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) analysis. Second, the maximum removal capacity of the magnetic iron nanoparticle-immobilized D. radiodurans R1 strain (DR-FeNPs) for arsenic [As(V)] was evaluated under the optimized conditions. Finally, the removal capacity of DR-FeNPs in the presence of various competitive anions was also investigated to simulate the practical application. More than 98% of As(V) was efficiently removed by DR-FeNPs within 1 h, and the removal efficiency was stably maintained for up to 32 h (98.97%). Furthermore, the possibility of recovery of DR-FeNPs after use was also suggested using magnets as a proof-of-concept.

Optimising the Growth of Few-Layer Graphene on Silicon Carbide by Nickel Silicidation

2013 ◽  
Vol 740-742 ◽  
pp. 121-124 ◽  
Author(s):  
Enrique Escobedo-Cousin ◽  
Konstantin Vassilevski ◽  
Toby Hopf ◽  
Nick G. Wright ◽  
Anthony O’Neill ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Solid Phase ◽  
Sample Surface ◽  
Device Fabrication ◽  
Solid Phase Epitaxy ◽  
X Ray ◽  
Graphene Films ◽  
Few Layer Graphene ◽  
The Impact

Few-layers graphene films (FLG) were grown by local solid phase epitaxy on a semi-insulating 6H-SiC substrate by annealing Ni films deposited on the Si and C-terminated faces of the SiC. The impact of the annealing process on the final quality of the FLG films is studied using Raman spectroscopy. X-ray photoelectron spectroscopy was used to verify the presence of graphene on the sample surface. We also demonstrate that further device fabrication steps such as dielectric deposition can be carried out without compromising the FLG films integrity.

Fluorescence Enhancement Method for Enrofloxacin Extraction by Core–Shell Magnetic Microspheres

2020 ◽  
Vol 73 (11) ◽  
pp. 1105
Author(s):  
Linyan Yang ◽  
Leiming Fu ◽  
Boxin Li ◽  
Jifei Ma ◽  
Cun Li ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Solid Phase ◽  
Metal Organic Framework ◽  
Sodium Dodecyl ◽  
Covalent Modification ◽  
Magnetic Microspheres ◽  
Magnetic Characteristics ◽  
Fluorescent Properties ◽  
Xps Spectra ◽  
X Ray

In this work, we present novel kinds of γ-Fe2O3@SiO2-NH2-CMC/MOF5 and γ-Fe2O3@SiO2-NH2-CMC/IRMOF3 magnetic metal–organic framework (MOF) nanoparticles which possess both magnetic characteristics and fluorescent properties. Here, [Zn4O(bdc)3] (MOF-5, bdc=1,4-benzenedicarboxylate) is a kind of shell. IRMOF3, a known MOF with a cubic topology prepared from Zn(NO3)2⋅4H2O and 2-amino-1,4-benzene dicarboxylic acid, is another kind of shell which is attractive due to its highly porous, crystalline structure and the presence of non-coordinating amino groups on the benzenedicarboxylate (bdc) linker, which are amenable to post-synthetic modification. γ-Fe2O3@SiO2-NH2-CMC magnetic nanoparticles (MNPs) could be prepared by covalent modification of sodium carboxymethyl cellulose (CMC). The structure of γ-Fe2O3 nanoparticles could be determined by X-ray powder diffraction (XRD). X-ray photoelectron spectroscopy (XPS) spectra could be used for the characterisation of γ-Fe2O3@SiO2-NH2, γ-Fe2O3@SiO2-NH2-CMC, γ-Fe2O3@SiO2-NH2-CMC/MOF5, and γ-Fe2O3@SiO2-NH2-CMC/IRMOF3 nanoparticles. Magnetic solid-phase extraction (MSPE) of enrofloxacin (Enr) experiments exhibited that, for γ-Fe2O3@SiO2-NH2-CMC/IRMOF3, the best effects of adsorption could be obtained at pH 4 and 6, while elution conditions of 0.1mol L−1 NaOH and 1% sodium dodecyl sulfate could achieve the best elution effect. The addition of Tb3+ ions could sensitise the fluorescence of Enr. At the same time, via the addition of Tb3+ ions, coordination could occur between nanoparticles and Tb3+ ions, which could be verified by XPS.

scholarly journals Enhanced Electrochemical Performances of Cobalt-Doped Li2MoO3 Cathode Materials

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 843 ◽  
Author(s):  
Zhiyong Yu ◽  
Jishen Hao ◽  
Wenji Li ◽  
Hanxing Liu
Keyword(s):  
Cathode Materials ◽  
Photoelectron Spectroscopy ◽  
Solid Phase ◽  
Phase Method ◽  
Electrochemical Performances ◽  
X Ray ◽  
Electrochemical Tests ◽  
Co Doping ◽  
Solid Phase Method ◽  
Better Than

Co-doped Li2MoO3 was successfully synthesized via a solid phase method. The impacts of Co-doping on Li2MoO3 have been analyzed by X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FTIR) measurements. The results show that an appropriate amount of Co ions can be introduced into the Li2MoO3 lattices, and they can reduce the particle sizes of the cathode materials. Electrochemical tests reveal that Co-doping can significantly improve the electrochemical performances of the Li2MoO3 materials. Li2Mo0.90Co0.10O3 presents a first-discharge capacity of 220 mAh·g−1, with a capacity retention of 63.6% after 50 cycles at 5 mA·g−1, which is much better than the pristine samples (181 mAh·g−1, 47.5%). The enhanced electrochemical performances could be due to the enhancement of the structural stability, and the reduction in impedance, due to the Co-doping.

scholarly journals Magnetic γFe2O3@Sh@Cu2O: an efficient solid-phase catalyst for reducing agent and base-free click synthesis of 1,4-disubstituted-1,2,3-triazoles

BMC Chemistry ◽  
2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Fereshteh Norouzi ◽  
Shahrzad Javanshir
Keyword(s):  
Photoelectron Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Solid Phase ◽  
Click Reaction ◽  
Copper Acetate ◽  
Reducing Agent ◽  
Gravimetric Analysis ◽  
High Turnover ◽  
One Pot ◽  
X Ray

AbstractA hybrid magnetic material γFe2O3@Sh@cu2O was easily prepared from Shilajit (Sh) decorated Fe3O4 and copper acetate. The prepared magnetic hybrid material was fully characterized using different analysis, including Fourier transform infrared (FT-IR), X-ray diffraction (XRD), inductively coupled plasma (ICP), scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM) thermal gravimetric analysis (TGA) and Brunauer–Emmett–Teller (BET). All these analysis revealed that during coating of Fe3O4@Sh using copper salt (II), synchronized redox sorption of CuII to CuI occurs at the same time as the oxidation of Fe3O4 to γFe2O3. This magnetic catalyst exhibited excellent catalytic activity for regioselective synthesis of 1,4-disubstituted-1,2,3-triazoles via one pot three-component click reaction of sodium azide, terminal alkynes and benzyl halides in the absence of any reducing agent. High yields, short reaction time, high turnover number and frequency (TON = 3.5 * 105 and TOF = 1.0 * 106 h−1 respectively), easy separation, and efficient recycling of the catalyst are the strengths of the present method.

scholarly journals Studies on phenol removal from wastewater with CTAB-modified bentonite supported KMnO4

2013 ◽  
Vol 3 (3) ◽  
pp. 204-216 ◽  
Author(s):  
Jing Wang ◽  
Hongzhu Ma ◽  
Jie Yu ◽  
Shanshan Wang ◽  
Wenyan He ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Photoelectron Spectroscopy ◽  
Solid Phase ◽  
Phenol Degradation ◽  
Cod Removal ◽  
Phenol Removal ◽  
Solution Ph ◽  
Modified Bentonite ◽  
X Ray ◽  
Cod Removal Efficiency

Cetyltrimethylammonium bromide (CTAB) modified bentonite supported KMnO4 (KMnO4/CTAB-bent) was prepared by solid-phase grinding method, and applied to phenol removal from wastewater. Factors affecting efficiency, such as activated temperature, initial solution pH, KMnO4/CTAB-bent dosage, phenol initial concentration and reaction temperature on degradation were investigated. It was found that pH significantly affected the degradation and chemical oxygen demand (COD) removal efficiency. The results show that over 92% degradation and 60.58% COD removal efficiency can be obtained in 30 min. The surface properties and structure of KMnO4/CTAB-bent were measured by X-ray diffraction, X-ray photoelectron spectroscopy, Brunauer–Emmett–Teller, and Fourier transform infrared spectroscopy. However, it was demonstrated that the KMnO4/CTAB-bent was deactivated quickly during phenol degradation after the second cycle, indicating that the stability of KMnO4/CTAB-bent needs to be further improved.

Electronic structure of titanium(III) and titanium(IV) halides studied by solid-phase x-ray photoelectron spectroscopy

1987 ◽  
Vol 26 (8) ◽  
pp. 1212-1217 ◽  
Author(s):  
Christine Mousty-Desbuquoit ◽  
Joseph Riga ◽  
Jacques J. Verbist
Keyword(s):  
Electronic Structure ◽  
Photoelectron Spectroscopy ◽  
Solid Phase ◽  
X Ray

STUDY ON ABNORMAL PHENOMENON ABOUT ENHANCED ELECTRICAL CONDUCTIVITY OF Bi1-xBaxFeO3 CERAMICS

2014 ◽  
Vol 28 (05) ◽  
pp. 1450009 ◽  
Author(s):  
H. J. WANG ◽  
S. Y. WANG ◽  
W. F. LIU ◽  
X. J. XI ◽  
FENG GUO ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Photoelectron Spectroscopy ◽  
Oxygen Vacancies ◽  
Solid Phase ◽  
Electrical Conductance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Multiferroic Properties ◽  
Abnormal Phenomenon ◽  
Sintering Method

In order to investigate the effects of Ba doping BiFeO 3 on multiferroic properties, Bi 1-x Ba x FeO 3(0≤x≤1)( Ba x BFO ) ceramics were fabricated via rapid solid phase sintering method, and material's structures and electrical properties were investigated. The phase transitions from rhombohedral to pseudo-cubic (x = 10%) and then to tetragonal (x = 40%) were confirmed by X-ray diffraction investigation. Although the electrical conductivity of Ba x BFO (x = 10%, 20% and 30%) ceramics was low, which is a similar trend to previous reports, an abnormal enhancement of electrical conductance was observed in Ba x BFO (x = 1%, 3% and 5%) ceramics. Such as, the electrical conductivity of Ba 0.03 BFO is calculated to be ~106 Ω⋅ cm that is five orders of magnitude higher than that of the BiFeO 3. This has been discussed and ascribed to more percent of oxygen vacancies and Fe 2+ ions in Ba x BFO ceramics, as confirmed by X-ray photoelectron spectroscopy investigation.

Characterization of Carbon-Encapsulated Nickel and Iron Nanoparticles by Means of X-ray Absorption and Photoelectron Spectroscopy

2010 ◽  
Vol 114 (51) ◽  
pp. 22413-22416 ◽  
Author(s):  
V. R. Galakhov ◽  
A. S. Shkvarin ◽  
A. S. Semenova ◽  
M. A. Uimin ◽  
A. A. Mysik ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Iron Nanoparticles ◽  
X Ray ◽  
X Ray Absorption
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