scholarly journals Stability and Transportation of Iron Oxide Nanoparticles in Subsurface Water and Soil

2021 ◽  
Vol 14 ◽  
pp. 1-9
Author(s):  
Nur Suraya Ahmad ◽  
Shahidan Radiman ◽  
Wan Zuhairi Wan Yaacob
Keyword(s):  
Porous Media ◽  
Iron Oxide ◽  
Humic Acid ◽  
Iron Oxide Nanoparticles ◽  
Natural Water ◽  
Subsurface Water ◽  
Magnetic Data ◽  
Oxide Nanoparticles ◽  
Water Ph ◽  
Ph Range

Iron oxide nanoparticles are utilised in a broad range of applications (magnetic data storage, biosensing, drug delivery, treatment and remediation of contaminated soil and groundwater); causing noticeable quantities of iron oxide nanoparticles to be released into the environment. In this study, aggregation and stability of iron oxide nanoparticles in water were investigated within the range of pH 3 – pH 9 at a constant concentration of iron oxide nanoparticles and humic acid. The pH of the solution was selected to be continuously monitored at pH 7 to investigate the transportation and deposition behaviour of iron oxide nanoparticles in porous media at different velocities. It was found that iron oxide nanoparticles were aggregated and settle down as settled particles at low pH (pH 3 – pH 5). Iron oxide nanoparticles were stable, mobile and transported at a high pH, which is the pH range of natural water (pH 6.5 – pH 8.5). Iron oxide nanoparticles were strongly attached to the silica sand at natural water velocity in porous media, which is 2.93 ml min-1. Overall, the presence of humic acid in aquifers and porous media, the pH range of natural water (pH 6.5 – pH 8.5) and the slow speed (2.93 ml min-1) of water are expected to be a key factor that enhances the stability and mobility of iron oxide nanoparticles in natural water and porous media.

scholarly journals Magnetic iron oxide and manganese-doped iron oxide nanoparticles for the collection of alpha-emitting radionuclides from aqueous solutions

RSC Advances ◽  
2016 ◽  
Vol 6 (107) ◽  
pp. 105239-105251 ◽  
Author(s):  
Matthew J. O'Hara ◽  
Jennifer C. Carter ◽  
Cynthia L. Warner ◽  
Marvin G. Warner ◽  
R. Shane Addleman
Keyword(s):  
Iron Oxide ◽  
Aqueous Solutions ◽  
Iron Oxide Nanoparticles ◽  
Human Urine ◽  
Natural Waters ◽  
Magnetic Nanomaterials ◽  
Oxide Nanoparticles ◽  
Magnetic Iron Oxide ◽  
Ph Range ◽  
Mn Doped

The sorption performance of two amphoteric magnetic nanomaterials, Fe3O4and Mn-doped Fe3O4, has been evaluated for Po, Ra, U, and Am in natural waters (river, ground, and sea) as well as human urine across a pH range.

Adsorption and desorption of chromium with humic acid coated iron oxide nanoparticles

2019 ◽  
Vol 26 (29) ◽  
pp. 30044-30054 ◽  
Author(s):  
Shilpa Gnanamuthu Singaraj ◽  
Biswanath Mahanty ◽  
Darshan Balachandran ◽  
Anamika Padmaprabha
Keyword(s):  
Iron Oxide ◽  
Humic Acid ◽  
Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Adsorption And Desorption

scholarly journals Experimental Study and Numerical Solution of Poly Acrylic Acid Supported Magnetite Nanoparticles Transport in a One-Dimensional Porous Media

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
M. Golzar ◽  
S. F. Saghravani ◽  
M. Azhdari Moghaddam
Keyword(s):  
Porous Media ◽  
Iron Oxide ◽  
Acrylic Acid ◽  
Numerical Solution ◽  
Iron Oxide Nanoparticles ◽  
Iron Nanoparticles ◽  
Chlorinated Solvents ◽  
Oxide Nanoparticles ◽  
One Dimensional ◽  
Poly Acrylic Acid

Recently, iron nanoparticles have attracted more attention for groundwater remediation due to its potential to reduce subsurface contaminants such as PCBs, chlorinated solvents, and heavy metals. The magnetic properties of iron nanoparticles cause to attach to each other and form bigger colloid particles of iron nanoparticles with more rapid sedimentation rate in aqueous environment. Using the surfactants such as poly acrylic acid (PAA) prevents iron nanoparticles from forming large flocs that may cause sedimentation and so increases transport distance of the nanoparticles. In this study, the transport of iron oxide nanoparticles (Fe3O4) stabilized with PAA in a one-dimensional porous media (column) was investigated. The slurries with concentrations of 20,100 and 500 (mg/L) were injected into the bottom of the column under hydraulic gradients of 0.125, 0.375, and 0.625. The results obtained from experiments were compared with the results obtained from numerical solution of advection-dispersion equation based on the classical colloid filtration theory (CFT). The experimental and simulated breakthrough curves showed that CFT is able to predict the transport and fate of iron oxide nanoparticles stabilized with PAA (up to concentration 500 ppm) in a porous media.

scholarly journals Surfactant free superparamagnetic iron oxide nanoparticles for stable ferrofluids in physiological solutions

2015 ◽  
Vol 51 (14) ◽  
pp. 2863-2866 ◽  
Author(s):  
K. Mandel ◽  
M. Straßer ◽  
T. Granath ◽  
S. Dembski ◽  
G. Sextl
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Superparamagnetic Iron Oxide ◽  
Silica Shell ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Wide Ph Range ◽  
Ph Range

Ferrofluids of superparamagnetic Fe3O4 nanoparticles with “patchy” silica shell are stable over a wide pH range and in physiological solutions.

scholarly journals Comparative Studies of Dye Removal Efficiency of Surface Functionalized Nanoparticles with Other Adsorbents: Isotherm and Kinetic Study

2021 ◽  
Vol 33 (12) ◽  
pp. 3031-3038
Author(s):  
Arti Jangra ◽  
Jaiveer Singh ◽  
Radhika Khanna ◽  
Parvin Kumar ◽  
Suresh Kumar ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Humic Acid ◽  
Iron Oxide Nanoparticles ◽  
Removal Efficiency ◽  
Magnetite Nanoparticles ◽  
Dye Removal ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
Crystal Violet Dye ◽  
Pseudo Second Order

In present work, the synthesis of the humic acid functionalized iron oxide nanoparticles and their application in water treatment are reported. The bare and humic acid functionalized iron oxide nanoparticles were characterized using different techniques such as X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA) and Fourier transform infrared (FTIR) spectroscopy. The synthesized magnetite nanoparticles coated with humic acid showed efficient removal of crystal violet dye from the aqueous solution. The functionalized magnetite nanoparticles were found to have higher adsorption capacity as compared to bare magnetite nanoparticles and the pure humic acid under specific conditions. The adsorption kinetics study was found in accordance with pseudo-second order kinetics while the isotherm data was observed to be in good agreement with the Tempkin isotherm. A comparative study of dye removal efficiency of humic acid functionalized magnetite nanoparticles with reported adsorbents has also been made.

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