X-ray Photoelectron Spectroscopy of Fast-Frozen Hematite Colloids in Aqueous Solutions. 2. Tracing the Relationship between Surface Charge and Electrolyte Adsorption

2010 ◽  
Vol 114 (6) ◽  
pp. 2613-2616 ◽  
Author(s):  
Jean-François Boily ◽  
Andrei Shchukarev
Keyword(s):  
Aqueous Solutions ◽  
Surface Charge ◽  
Photoelectron Spectroscopy ◽  
X Ray ◽  
The Relationship

scholarly journals Fabrication of Carboxymethylcellulose/Metal-Organic Framework Beads for Removal of Pb(II) from Aqueous Solution

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 942 ◽  
Author(s):  
Huo-Xi Jin ◽  
Hong Xu ◽  
Nan Wang ◽  
Li-Ye Yang ◽  
Yang-Guang Wang ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Photoelectron Spectroscopy ◽  
Langmuir Isotherm ◽  
Adsorption Equilibrium ◽  
Isotherm Model ◽  
Maximum Adsorption Capacity ◽  
X Ray ◽  
Metal Organic ◽  
Langmuir Isotherm Model

The ability to remove toxic heavy metals, such as Pb(II), from the environment is an important objective from both human-health and ecological perspectives. Herein, we describe the fabrication of a novel carboxymethylcellulose-coated metal organic material (MOF-5–CMC) adsorbent that removed lead ions from aqueous solutions. The adsorption material was characterized by Fourier-transform infrared spectroscopy, X-ray diffractometry, scanning electron microscopy, and X-ray photoelectron spectroscopy. We studied the functions of the contact time, pH, the original concentration of the Pb(II) solution, and adsorption temperature on adsorption capacity. MOF-5–CMC beads exhibit good adsorption performance; the maximum adsorption capacity obtained from the Langmuir isotherm-model is 322.58 mg/g, and the adsorption equilibrium was reached in 120 min at a concentration of 300 mg/L. The adsorption kinetics is well described by pseudo-second-order kinetics, and the adsorption equilibrium data are well fitted to the Langmuir isotherm model (R2 = 0.988). Thermodynamics experiments indicate that the adsorption process is both spontaneous and endothermic. In addition, the adsorbent is reusable. We conclude that MOF-5–CMC is a good adsorbent that can be used to remove Pb(II) from aqueous solutions.

scholarly journals Quantitative interpretation of molecular dynamics simulations for X-ray photoelectron spectroscopy of aqueous solutions

2016 ◽  
Vol 144 (15) ◽  
pp. 154704 ◽  
Author(s):  
Giorgia Olivieri ◽  
Krista M. Parry ◽  
Cedric J. Powell ◽  
Douglas J. Tobias ◽  
Matthew A. Brown
Keyword(s):  
Molecular Dynamics ◽  
Aqueous Solutions ◽  
Molecular Dynamics Simulations ◽  
Photoelectron Spectroscopy ◽  
Quantitative Interpretation ◽  
X Ray ◽  
Dynamics Simulations

Property of Cu2O-CuO/ZSM-5 nanocomposite and degradation process of azo dye AO7 without sacrificial agent (H2O2)

2016 ◽  
Vol 73 (11) ◽  
pp. 2747-2753 ◽  
Author(s):  
Wusong Kong ◽  
Hongxia Qu ◽  
Peng Chen ◽  
Weihua Ma ◽  
Huifang Xie
Keyword(s):  
Catalytic Activity ◽  
Aqueous Solutions ◽  
Photoelectron Spectroscopy ◽  
Oxygen Demand ◽  
Operating Conditions ◽  
Surface Element ◽  
Impregnation Method ◽  
X Ray ◽  
Initial Ph ◽  
Sacrificial Agent

In this study, Cu2O-CuO/ZSM-5 nanocomposite was synthesized by the impregnation method, and its catalytic performance for the destruction of AO7 in aqueous solutions was investigated. The morphology, structure and surface element valence state of Cu2O-CuO/ZSM-5 were characterized by transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The operating conditions on the degradation of AO7 by Cu2O-CuO/ZSM-5, such as initial pH values, concentration of AO7 and catalyst dosage were investigated and optimized. The results showed that the sample had good catalytic activity for destruction of AO7 in the absence of a sacrificial agent (e.g. H2O2): it could degrade 91% AO7 in 140 min at 25 °C and was not restricted by the initial pH of the AO7 aqueous solutions. Cu2O-CuO/ZSM-5 exhibited stable catalytic activity with little loss after three successive runs. The total organic carbon and chemical oxygen demand removal efficiencies increased rapidly to 69.36% and 67.3% after 120 min of treatment by Cu2O-CuO/ZSM-5, respectively.

X-ray Photoelectron Spectroscopy of Fast-Frozen Hematite Colloids in Aqueous Solutions. 6. Sodium Halide (F–, Cl–, Br–, I–) Ion Binding on Microparticles

Langmuir ◽  
2018 ◽  
Vol 34 (45) ◽  
pp. 13497-13504
Author(s):  
Marie Lucas ◽  
Merve Yeşilbaş ◽  
Andrey Shchukarev ◽  
Jean-François Boily
Keyword(s):  
Aqueous Solutions ◽  
Photoelectron Spectroscopy ◽  
Ion Binding ◽  
X Ray

scholarly journals Influence of Magnesia on Demoulding Strength of Colloidal Silica-Bonded Castables

2019 ◽  
Vol 58 (1) ◽  
pp. 32-37 ◽  
Author(s):  
Yang Zhang ◽  
Lingling Zhu ◽  
Liugang Chen ◽  
Luoqiang Liu ◽  
Guotian Ye
Keyword(s):  
Chemical Bond ◽  
Photoelectron Spectroscopy ◽  
Fourier Transformation ◽  
Colloidal Silica ◽  
Primary Reason ◽  
X Ray ◽  
Fourier Transformation Infrared Spectroscopy ◽  
The Relationship ◽  
New Si ◽  
Strength Improvement

AbstractThe change in demoulding strength of colloidal silica-bonded castables with and without magnesia is investigated with emphasis on the relationship between the demoulding strength and chemical bond changes. It was confirmed that the demoulding strength was raised with the presence of magnesia in colloidal silica-bonded castables because of the increased chemical bonding between the sol particles. The X-ray photoelectron spectroscopy (XPS) and the Fourier transformation infrared spectroscopy (FTIR) results indicate the formation of new Si–O–Mg chemical bond from the decreased O 1s and Si 2p binding energy, and the appearance of weak vibration peaks at 668 and 419 cm−1 in the spectrum of colloidal silica with the addition of MgO after curing at 30°C for 24 hours. The reaction between colloidal silica and magnesia could promote the formation of –Si–O–Mg–O–Si–bonds, which is the primary reason for the demoulding strength improvement.

p-Type dopant incorporation and surface charge properties of catalyst-free GaN nanowires revealed by micro-Raman scattering and X-ray photoelectron spectroscopy

Nanoscale ◽  
2014 ◽  
Vol 6 (17) ◽  
pp. 9970-9976 ◽  
Author(s):  
Q. Wang ◽  
X. Liu ◽  
M. G. Kibria ◽  
S. Zhao ◽  
H. P. T. Nguyen ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Surface Charge ◽  
Photoelectron Spectroscopy ◽  
X Ray ◽  
Gan Nanowires ◽  
Catalyst Free ◽  
Dopant Incorporation ◽  
P Type

p-Type dopant (magnesium) incorporation and surface charge properties of catalyst-free GaN nanowires are revealed by micro-Raman scattering and X-ray photoelectron spectroscopy.

scholarly journals Mechanochemically Synthesised Coal-Based Magnetic Carbon Composites for Removing As(V) and Cd(II) from Aqueous Solutions

Nanomaterials ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 100 ◽  
Author(s):  
Anton Zubrik ◽  
Marek Matik ◽  
Michal Lovás ◽  
Zuzana Danková ◽  
Mária Kaňuchová ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
Aqueous Solutions ◽  
Photoelectron Spectroscopy ◽  
Mossbauer Spectroscopy ◽  
Nitrogen Adsorption ◽  
High Energy ◽  
Magnetic Composites ◽  
Responsive Materials ◽  
X Ray ◽  
Mößbauer Spectroscopy

The continued decrease in water quality requires new advances in the treatment of wastewater, including the preparation of novel, effective, environmentally friendly, and affordable sorbents of toxic pollutants. We introduce a simple non-conventional mechanochemical synthesis of magnetically responsive materials. Magnetic lignite and magnetic char were prepared by high-energy ball co-milling from either raw Slovak lignite or coal-based char together with a ferrofluid. The products were characterised by X-ray diffraction, electron microscopy, 57Fe Mössbauer spectroscopy, X-ray photoelectron spectroscopy (XPS), volumetric magnetic susceptibility, and low-temperature nitrogen adsorption, and both magnetic carbons were comparatively tested as potential sorbents of As(V) oxyanions and Cd(II) cations in aqueous solutions. The magnetic char was an excellent sorbent of As(V) oxyanions (Qm = 19.9 mg/g at pH 3.9), whereas the magnetic lignite was less effective. The different sorption properties towards arsenic anions may have been due to different oxidation states of iron on the surfaces of the two magnetic composites (determined by XPS), although the overall state of iron monitored by Mössbauer spectroscopy was similar for both samples. Both magnetic composites were effective sorbents for removing Cd(II) cations (Qm (magnetic lignite) = 70.4 mg/g at pH 6.5; Qm (magnetic char) = 58.8 mg/g at pH 6.8).

Surface Charge of the Calcite (104) Terrace Measured by Rb+Adsorption in Aqueous Solutions Using Resonant Anomalous X-ray Reflectivity

2016 ◽  
Vol 120 (28) ◽  
pp. 15216-15223 ◽  
Author(s):  
Sang Soo Lee ◽  
Frank Heberling ◽  
Neil C. Sturchio ◽  
Peter J. Eng ◽  
Paul Fenter
Keyword(s):  
Aqueous Solutions ◽  
Surface Charge ◽  
X Ray

X-ray Photoelectron Spectroscopy of Fast-Frozen Hematite Colloids in Aqueous Solutions. 5. Halide Ion (F–, Cl–, Br–, I–) Adsorption

Langmuir ◽  
2013 ◽  
Vol 29 (8) ◽  
pp. 2623-2630 ◽  
Author(s):  
Kenichi Shimizu ◽  
Andrey Shchukarev ◽  
Philipp A. Kozin ◽  
Jean-François Boily
Keyword(s):  
Aqueous Solutions ◽  
Photoelectron Spectroscopy ◽  
X Ray
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