Arsenic(III,V) Adsorption on Iron-Oxide-Coated Manganese Sand and Quartz Sand: Comparison of Different Carriers and Adsorption Capacities

2011 ◽  
Vol 28 (9) ◽  
pp. 643-651 ◽  
Author(s):  
Kun Wu ◽  
Ruiping Liu ◽  
Huijuan Liu ◽  
Xu Zhao ◽  
Jiuhui Qu
Keyword(s):  
Iron Oxide ◽  
Quartz Sand ◽  
Adsorption Capacities

A laboratory study to determine the effect of iron oxides on proton NMR measurements

Geophysics ◽  
2007 ◽  
Vol 72 (1) ◽  
pp. E27-E32 ◽  
Author(s):  
Kristina Keating ◽  
Rosemary Knight
Keyword(s):  
Iron Oxide ◽  
Relaxation Rate ◽  
Iron Oxides ◽  
Quartz Sand ◽  
Pore Space ◽  
Nmr Relaxation ◽  
Volume Ratio ◽  
Proton Nuclear Magnetic Resonance ◽  
Surface Relaxation ◽  
Relaxation Rates

Using laboratory methods, we investigate the effect of the presence and mineralogic form of iron on measured proton nuclear magnetic resonance (NMR) relaxation rates. Five samples of quartz sand were coated with ferrihydrite, goethite, hematite, lepidocrocite, and magnetite. The relaxation rates for these iron-oxide-coated sands saturated with water were measured and compared to the relaxation rate of quartz sand saturated with water. We found that the presence of the iron oxides led to increases in the relaxation rates by increasing the surface relaxation rate. The magnitude of the surface relaxation rate was different for the various iron-oxide minerals because of changes in both the surface-area-to-volume ratio of the pore space, and the surface relaxivity. The relaxation rate of the magnetite-coated sand was further increased because of internal magnetic field gradients caused by the presence of magnetite. We conclude that both the concentration and mineralogical form of iron can have a significant impact on NMR relaxation behavior.

Transport of Iron Oxide Colloids in Packed Quartz Sand Media: Monolayer and Multilayer Deposition

2000 ◽  
Vol 231 (1) ◽  
pp. 32-41 ◽  
Author(s):  
Florian Kuhnen ◽  
Kurt Barmettler ◽  
Subir Bhattacharjee ◽  
Menachem Elimelech ◽  
Ruben Kretzschmar
Keyword(s):  
Iron Oxide ◽  
Quartz Sand ◽  
Multilayer Deposition

scholarly journals Effect of the Surface Charge on the Adsorption Capacity of Chromium(VI) of Iron Oxide Magnetic Nanoparticles Prepared by Microwave-Assisted Synthesis

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2372 ◽  
Author(s):  
Alvaro Gallo-Cordova ◽  
María del Puerto Morales ◽  
Eva Mazarío
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Surface Charge ◽  
Solid Phase ◽  
Superparamagnetic Iron Oxide ◽  
Water Remediation ◽  
Microwave Assisted Synthesis ◽  
Surface Charges ◽  
Chromium Vi ◽  
Adsorption Capacities

Solid phase extraction using magnetic nanoparticles has represented a leap forward in terms of the improvement of water quality, preventing the contamination of industrial effluents from discharge in a more efficient and affordable way. In the present work, superparamagnetic iron oxide nanoparticles (MNP) with different surface charges are tested as nanosorbents for the removal of chromium(VI) in aqueous solution. Uniform magnetic nanoparticles (~12 nm) were synthesized by a microwave polyol-mediated method, and tetraethyl orthosilicate (TEOS) and (3-aminopropyl) triethoxysilane (APTES) were grafted onto their surface, providing a variation in the surface charge. The adsorptive process of chromium was evaluated as a function of the pH, the initial concentration of chromium and contact time. Kinetic studies were best described by a pseudo-second order model in all cases. TEOS@MNP barely removed the chromium from the media, while non-grafted particles and APTES@TEOS@MNP followed the Langmuir model, with maximum adsorption capacities of 15 and 35 mgCr/g, respectively. The chromium adsorption capacities abruptly increased when the surface became positively charged as the species coexisting at the experimental pH are negatively charged. Furthermore, these particles have proven to be highly efficient in water remediation due their 100% reusability after more than six consecutive adsorption/desorption cycles.

Using Red Mud Manufacturing Building Glass-Ceramics

2013 ◽  
Vol 423-426 ◽  
pp. 1014-1017
Author(s):  
Chang Sheng Hu ◽  
Xi Wang
Keyword(s):  
Iron Oxide ◽  
Glass Ceramic ◽  
Quartz Sand ◽  
Red Mud ◽  
Glass Surface ◽  
Molten Glass ◽  
Ceramic Body ◽  
Glass Ceramics ◽  
Surface Color ◽  
Annealing Glass

In this paper, red mud of aluminum industrial residue has been studied to make the glass-ceramic, quartz sand, magnesite, fluorite and red mud was mixed to melt, molten glass was poured into the model in shape, then annealing, glass-ceramic was make, the color of glass-ceramic is brown or black, the crystals in glass-ceramic body is iron oxide by XRD, Strength, the expansion coefficient and morphology of the sample were measured. Glass surface color depends on the melting temperature.

scholarly journals Iron Oxide (Fe3O4)-Supported SiO2 Magnetic Nanocomposites for Efficient Adsorption of Fluoride from Drinking Water: Synthesis, Characterization, and Adsorption Isotherm Analysis

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1514
Author(s):  
Amna Sarwar ◽  
Jin Wang ◽  
Muhammad Saqib Khan ◽  
Umar Farooq ◽  
Nadia Riaz ◽  
...  
Keyword(s):  
Drinking Water ◽  
Iron Oxide ◽  
Research Work ◽  
Freundlich Isotherm ◽  
Chemical Precipitation ◽  
Magnetic Nanomaterials ◽  
Isotherm Models ◽  
Wet Impregnation ◽  
Adsorption Capacities ◽  
Adsorption Data

This research work reports the magnetic adsorption of fluoride from drinking water through silica-coated Fe3O4 nanoparticles. Chemical precipitation and wet impregnation methods were employed to synthesize the magnetic nanomaterials. Moreover, the synthesized nanomaterials were characterized for physicochemical properties through scanning electron microscopy, Fourier-transform infrared spectroscopy, and X-ray powder diffraction. Screening studies were conducted to select the best iron oxide loading (0.0–1.5 wt%) and calcination temperature (300–500 °C). The best selected nanomaterial (0.5Fe-Si-500) showed a homogenous FeO distribution with a 23.79 nm crystallite size. Moreover, the optimized reaction parameters were: 10 min of contact time, 0.03 g L−1 adsorbent dose, and 10 mg L−1 fluoride (F−) concentration. Adsorption data were fitted to the Langmuir and Freundlich isotherm models. The Qm and KF (the maximum adsorption capacities) values were 5.5991 mg g−1 and 1.869 L g−1 respectively. Furthermore, accelerated adsorption with shorter contact times and high adsorption capacity at working pH was among the outcomes of this research work.

Effect of rhamnolipid biosurfactant on transport and retention of iron oxide nanoparticles in water-saturated quartz sand

2021 ◽  
Author(s):  
Shuchi Liao ◽  
Anushree Ghosh ◽  
Matthew D. Becker ◽  
Linda M. Abriola ◽  
Natalie L. Cápiro ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Quartz Sand ◽  
Column Experiments ◽  
Oxide Nanoparticles ◽  
The Stability ◽  
Rhamnolipid Biosurfactant ◽  
Water Saturated

Column experiments and mathematical modeling results demonstrated that rhamnolipid biosurfactant can enhance the stability and mobility of iron oxide nanoparticles in water-saturated quartz sand.

scholarly journals Adsorption of Cu(II) and Zn(II) Ions from Aqueous Solution by Gel/PVA-Modified Super-Paramagnetic Iron Oxide Nanoparticles

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2982 ◽  
Author(s):  
Anudari Dolgormaa ◽  
Chang-jiang Lv ◽  
Yin Li ◽  
Jian Yang ◽  
Jun-xing Yang ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Precipitation Method ◽  
Oxide Nanoparticles ◽  
Super Paramagnetic Iron Oxide ◽  
Adsorption Capacities ◽  
Monolayer Adsorption ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
Co Precipitation

Super-paramagnetic iron oxide nanoparticles (SPIONs)/gelatin (gel)/polyvinyl alcohol (PVA) nanoparticles were designed and synthesized by the co-precipitation method and further modified with gel and PVA. These nanoparticles were used for the removal of Cu(II) and Zn(II) from aqueous solutions. The adsorbents were rich in different functional groups for chemisorption and showed effective adsorption properties. The adsorption of Cu(II) and Zn(II) on the SPIONs/gel and SPIONs/gel/PVA materials were investigated with respect to pH, adsorption kinetics, and adsorption isotherms. The adsorption data was fitted to the Langmuir, Freundlich, and Sips models at the optimum pH 5.2 (±0.2) over 60 min; SPIONs/gel showed maximum adsorption capacities of 47.594 mg/g and 40.559 mg/g for Cu(II) and Zn(II); SPIONs/gel/PVA showed those of 56.051 mg/g and 40.865 mg/g, respectively. The experimental data fitted the pseudo-second-order model, indicating that the process followed chemical monolayer adsorption. In addition, the SPIONs/gel/PVA showed better stability and Cu(II) adsorption efficiency than SPIONs/gel.

Field and Laboratory Investigations of Inactivation of Viruses (PRD1 and MS2) Attached to Iron Oxide-Coated Quartz Sand

2002 ◽  
Vol 36 (11) ◽  
pp. 2403-2413 ◽  
Author(s):  
Joseph N. Ryan ◽  
Ronald W. Harvey ◽  
David Metge ◽  
Menachem Elimelech ◽  
Theresa Navigato ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Quartz Sand ◽  
Laboratory Investigations
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